Ama Dablam Weather Month by Month Guide for Indian Climbers
On Ama Dablam, weather is not just background information. It is the variable that determines whether your summit attempt succeeds or fails — sometimes within a window of just a few hours. Seven Summit Treks' meteorological team puts it plainly: all the preparation, the acclimatisation rotations, the fixed rope work, the weeks of effort — it all comes down to recognising the right weather window and moving through it at the right time.
Most weather guides for Ama Dablam are written generically — spring good, autumn good, monsoon bad, winter cold. That is true but it is not useful. This guide goes deeper: month-by-month conditions at every camp, specific temperature ranges, wind data, the two weather systems that most affect the Khumbu, and — uniquely for Indian climbers — how to align your expedition departure with India's leave calendar so your October summit window lands in the best possible week.
Ama Dablam Weather — Key Facts Best month overall: October — post-monsoon clarity, stable windows, ideal temperatures Second best: April–May (spring) — warming trend, good visibility, less crowded than autumn Avoid completely: June–August (monsoon) — wet rock, poor visibility, high avalanche risk Challenging but possible: November — increasingly cold, shorter days, windows narrowing Never recommended: December–February (winter) — extreme cold, fierce jet stream winds Summit day temperature range (Camp 2, October): -15°C to -25°C at midnight departure Base Camp temperature range (October): +5°C to +12°C day, -5°C to -10°C night India-specific: October Dussehra/Diwali leave window aligns perfectly with peak summit conditions |
Why Ama Dablam Weather Matters More Than on Most Mountains
Every mountain is weather-dependent. Ama Dablam is weather-critical in a specific way — because the technical nature of the route means bad conditions do not just make the climb harder, they make it genuinely dangerous in ways that a non-technical peak does not replicate.
On the Yellow Tower at 6,300–6,400m, wet or iced rock dramatically reduces crampon grip on holds that are already demanding in dry conditions. On the snow arêtes above, wind speeds that would be uncomfortable at Base Camp become potentially fatal — the ridge is narrow enough that a strong gust and a misstep are all that separates a secure traverse from a serious fall. At Camp 2 at 6,000m, even a moderate storm means a tent in -25°C wind — which burns the energy reserves your summit push needs.
This is why Ama Dablam's summit success rate — approximately 55–65% with a well-run guided expedition — is significantly affected by weather timing. Expeditions that arrive in the wrong week, or that do not have a capable Sirdar reading the weather correctly for go/no-go decisions, see meaningfully lower success rates regardless of client preparation.
For Indian climbers coordinating leave months in advance, understanding the weather calendar is not just interesting — it is the foundation of your expedition planning. The question is not just 'what month is best?' but 'which specific week in which month gives the best combination of weather stability and India leave availability?'
The Two Weather Systems That Drive Ama Dablam Conditions
To understand Ama Dablam's weather calendar, you need to understand two systems that operate on very different scales but both directly affect what happens on the mountain.
1. The Indian Monsoon — The Annual Reset
The Indian subcontinental monsoon — which Indian climbers know intimately from their own cities — drives the Khumbu's weather calendar as directly as it drives India's. The monsoon arrives in the Khumbu in mid-June, brings heavy precipitation and cloud cover through July and August, and retreats in mid-September. The period immediately after monsoon withdrawal — late September through November — is when the Himalayan sky is at its clearest, the rock is dry, and the atmosphere is washed clean of dust and haze.
This post-monsoon window is the primary reason October is Ama Dablam's best month. The mountain emerges from the monsoon with firm snow conditions on the upper sections, rock that has been washed and dried, and an atmospheric clarity that puts Everest's south face in sharp relief from the summit — an unforgettable sight on a clear October morning.
Indian climbers have an intuitive understanding of the monsoon's timing that Western climbers often lack. You know what a monsoon feels like, you know how it retreats, and you know that the week after the last heavy rain is when the sky turns extraordinary. That same instinct translates directly to Khumbu weather reading.
2. The Jet Stream — The Summit Day Wildcard
The polar jet stream — the high-altitude river of fast-moving air that circles the globe — affects the Himalayan range year-round but is most relevant for Khumbu expeditions in the transition periods (November and March/April). The jet stream sits north of the Himalayas in summer and south of them in winter. During the transition months, it hovers at Himalayan altitude, creating the high winds that make November summit bids progressively riskier as the month advances.
This is the specific reason that October is climatologically better than November for Ama Dablam — the jet stream is still sufficiently north in October to give relatively calm upper-altitude windows, while by late November it has descended to the level of the high camps and summit ridge. Expeditions that arrive in mid-October and are ready to push by late October or early November are in the optimal position.
Practically for Indian climbers: this is why Trekyaari specifically designs autumn expeditions to arrive in Kathmandu in the first week of October and be in the summit window by the third or fourth week. The science supports the timing.
Ama Dablam Weather — Month by Month Guide
January — Deep Winter
January is the coldest month on Ama Dablam. The jet stream sits at or below summit altitude, generating winds that regularly exceed 80–100 km/h on the upper ridge. Summit temperatures average -25°C to -30°C, with wind chill pushing the effective temperature toward -40°C or lower. Base Camp temperatures hover around -10°C to -15°C at night.
Climbing in January: only for very experienced alpinists attempting technical new routes. No commercial expeditions operate in January. Permit available (off-season USD 500) but conditions make it genuinely extreme.
February — Late Winter
Similar to January — jet stream conditions remain harsh, temperatures slowly begin to moderate in the second half of the month but remain extreme on the upper mountain. Some expeditions use late February to begin very early spring acclimatisation rotations on lower sections, but summit attempts before March are rare and high-risk.
March — Early Spring Opening
The first viable month for spring expeditions. The jet stream begins its northward migration in March, and weather windows start to appear — brief initially, lengthening through the month. Temperatures at Base Camp range from -5°C to +5°C during the day. The upper mountain remains challenging but summit windows of 2–3 days begin to occur.
March characteristics: snow coverage is maximum on the route (winter accumulation), which can make the approach sections slower but the high camp terrain more consolidated. Some years, March offers excellent climbing conditions; other years the jet stream lingers longer and the month is largely unsuitable.
April — Primary Spring Season
April is the prime spring month — arguably the best month of the spring season for Ama Dablam. The jet stream is reliably north, temperatures are warming (Base Camp daytime +8°C to +15°C), and stable weather windows of 4–7 days become regular. This is when most spring expeditions time their summit pushes.
April characteristics: rhododendron forests in full bloom on the approach trail — the Lukla-to-Base Camp walk in April is one of the finest in the Khumbu. Snow on the upper sections is beginning to consolidate and in some places firm up as temperatures moderate. Less commercial traffic than October, which many climbers prefer.
May — Late Spring
Good climbing conditions in early May but deteriorating through the month as pre-monsoon moisture begins to build. The first two weeks of May offer conditions comparable to April. By mid-to-late May, afternoon cloud buildup becomes regular, thunderstorm risk increases, and the approach trails become warmer and muggier. Most spring expeditions target early-to-mid May summits.
May characteristics: warmer temperatures at Base Camp (+12°C to +20°C daytime) mean more comfortable Base Camp living but more unpredictable afternoon weather on the mountain. Late May expeditions carry significant pre-monsoon uncertainty.
June — Monsoon Onset
The monsoon arrives in the Khumbu typically in mid-June. June is a transition month — conditions in early June may still be reasonable, but the rapid deterioration through the month makes expedition planning difficult. By late June, persistent cloud cover, wet rock, and increased precipitation make technical climbing on Ama Dablam genuinely hazardous. The permit is available (off-season USD 500) but the conditions do not recommend it.
July and August — Full Monsoon
The two months that no serious operator recommends for Ama Dablam. Heavy daily precipitation, constant cloud cover, wet and slippery rock on the technical sections, elevated avalanche risk from fresh snow loading the Dablam glacier, leeches on the lower trail approaches, and near-zero visibility for extended periods. Permits exist. Conditions are not acceptable for a responsible expedition.
September — Monsoon Withdrawal
September is a transition month — one of the most interesting in the Khumbu weather calendar. The monsoon begins withdrawing mid-month, and conditions can shift dramatically within a week. Early September is still monsoon conditions. By late September — specifically the last 10 days — the sky begins its extraordinary post-monsoon transformation: visibility sharpening, precipitation dropping, the air washing clean.
September in the expedition context: most autumn expeditions arrive in Kathmandu in late September, using the Lukla approach walk through late September and early October to coincide with the improving conditions. Arriving in mid-September means you are trekking in late-monsoon conditions — wetter, cloudier, and with more uncertain views, though the trails are less crowded.
October — The Best Month on the Mountain
October is the single best month to be on Ama Dablam. The monsoon has fully withdrawn, the post-monsoon clarity is at its peak, temperatures are ideal — cold enough for firm snow conditions on the upper sections, warm enough for Base Camp to be liveable, and the jet stream is comfortably north. Summit windows of 5–10 days occur regularly through October, and the most reliable windows typically fall between the 10th and 25th of the month.
October at Ama Dablam — What It Actually Looks and Feels Like Base Camp (4,600m): Daytime +8°C to +14°C, night -5°C to -10°C. Comfortable in camp, warm enough to sit outside in the afternoon. Camp 1 (5,800m): Daytime 0°C to +5°C, night -12°C to -18°C. Cold but manageable. Good sleeping in expedition bag. Camp 2 (6,000m): Daytime -5°C to +2°C, night -15°C to -22°C. Serious cold begins here. Double bags required. Summit (6,812m, summit morning): -15°C to -28°C at midnight departure. Wind chill can push this to -35°C or lower on windy days. Summit panorama in October: Everest, Lhotse, Makalu at eye level in razor-sharp morning air. The finest mountain panorama in the Khumbu. Typical October summit window: 5–8 consecutive stable days, usually occurring 2–3 times through the month. Crowd factor: October is peak season — 30–40 expedition teams on the route simultaneously. Early October spots book out by June. |
November — The Narrowing Window
November is climatologically the second autumn month, but it operates very differently from October. Early November (first 10 days) often offers conditions comparable to late October — still good summit windows, still clear skies, manageable temperatures. But through the month, the jet stream descends, temperatures drop sharply, daylight shortens, and summit windows become shorter and more unpredictable.
November in the expedition context: expeditions targeting a November summit are taking on meaningfully more uncertainty than an October expedition. By mid-November, temperatures at Camp 2 regularly reach -25°C to -30°C at night, and the summit ridge on days with jet stream influence can be genuinely extreme. The 2006 serac collapse that killed six climbers happened on 14 November — in November conditions. This is not a reason to avoid November but a reason to understand the risk profile accurately.
For Indian climbers: November expeditions are generally harder to fit into leave schedules than October, offer less certain weather, and carry higher cold risk. The premium October window is worth planning toward.
Ama Dablam Weather — Complete Month by Month Data Table
Month | BC Temp Day | BC Temp Night | Summit Temp | Precipitation | Wind | Summit Windows | Rating for Expedition |
January | −10°C to −5°C | −18°C to −22°C | −28°C to −35°C | Snow possible | Extreme — jet stream | Very rare | ❌ Not recommended |
February | −8°C to −3°C | −15°C to −20°C | −25°C to −32°C | Low | Extreme early, easing late | Rare, late month only | ❌ Not recommended |
March | −5°C to +5°C | −10°C to −15°C | −20°C to −28°C | Low | Moderating | Short windows forming | ⚠️ Early spring only |
April | +5°C to +15°C | −5°C to −10°C | −15°C to −22°C | Very low | Stable, calm | Regular 4–7 day windows | ✅ Primary spring |
May | +10°C to +20°C | 0°C to −5°C | −12°C to −18°C | Building pre-monsoon | Generally calm | Good early, uncertain late | ✅ Early May only |
June | +12°C to +18°C | +2°C to −2°C | −8°C to −12°C | Heavy — monsoon onset | Variable | Very limited | ❌ Avoid |
July | +12°C to +17°C | +3°C to 0°C | −5°C to −10°C | Heavy daily rain | Unstable | None viable | ❌ Avoid |
August | +12°C to +17°C | +3°C to 0°C | −5°C to −10°C | Heavy daily rain | Unstable | None viable | ❌ Avoid |
September | +8°C to +16°C | −2°C to −8°C | −10°C to −18°C | Decreasing through month | Improving late month | Late September only | ⚠️ Late Sep arrival |
October | +8°C to +14°C | −5°C to −10°C | −15°C to −28°C | Very low — post-monsoon | Calm, stable | Multiple 5–8 day windows | ✅ Best month |
November | +2°C to +8°C | −10°C to −18°C | −20°C to −35°C | Low but increasing | Increasing jet stream | Early Nov only | ⚠️ Early Nov viable |
December | −5°C to +2°C | −15°C to −20°C | −25°C to −33°C | Snow | Strong — jet stream | Very rare | ❌ Not recommended |
Camp-by-Camp Temperature Guide — What to Expect at Each Altitude
Generic weather guides give you Khumbu valley temperatures — which are relevant for the approach trek but not for the climbing sections. Here is the temperature reality at each camp on Ama Dablam's Southwest Ridge, specific to the prime October autumn season:
Camp | Altitude | Daytime High | Nighttime Low | What It Means Practically |
Lukla | 2,860m | +12°C to +18°C | 0°C to +5°C | T-shirt weather in afternoon. Light down jacket at night. Comfortable. |
Namche Bazaar | 3,440m | +8°C to +14°C | −2°C to +2°C | Mid-layer needed in morning. Sun is warm. Acclimatisation rest day — walk to 3,880m. |
Tengboche | 3,870m | +5°C to +12°C | −5°C to 0°C | Cold mornings. Down jacket for evening. Monastery visit in afternoon sun is warm. |
Dingboche | 4,360m | +2°C to +10°C | −8°C to −3°C | Fleece and down jacket needed all day. Cold windy afternoons common. |
Base Camp | 4,600m | 0°C to +12°C | −8°C to −5°C | Large temperature swing. Afternoon sun feels warm. Cold sets in fast after sunset. |
Camp 1 | 5,800m | −2°C to +5°C | −15°C to −20°C | Cold all day. Wind picking up at altitude. Expedition sleeping bag essential from here. |
Camp 2 | 6,000m | −5°C to +2°C | −18°C to −25°C | Serious cold. Every layer required. Wind exposure begins. Midnight departure from here. |
Summit | 6,812m | −15°C to −5°C (summit afternoon) | −20°C to −30°C (midnight) | Expedition mitts, balaclava, down suit — all working together. Wind chill can add −10°C+. |
The wind chill factor: At the summit on summit day (midnight to dawn), even moderate winds of 20–30 km/h drop the effective temperature by 8–12°C below the actual reading. A temperature of -20°C with 25 km/h wind feels like -30°C on exposed skin. This is why your Sirdar's weather read — specifically wind speed at summit altitude — is as important as temperature when making go/no-go decisions.
How Summit Weather Windows Work on Ama Dablam
All the months-of-the-year weather data above is strategic planning information. The tactical reality of summit day comes down to something much more specific: is there a 24–36 hour window of clear, low-wind conditions at summit altitude?
This is what your Sirdar and the meteorological service your operator uses assess every day during the expedition. Trekyaari uses forecast data from Meteotest (Bern, Switzerland) — the same service used by Seven Summit Treks and other major Himalayan operators — alongside real-time cross-checks from Mountain Forecast and Windy.com. Three models are compared before any go decision is made.
In practice, a viable Ama Dablam summit window requires:
• Wind speed at 6,800m below 30 km/h — above this, the arête traverse becomes genuinely risky
• No precipitation forecast in the 48 hours of the summit push — wet rock on the Yellow Tower is a significant safety concern
• Temperature at summit not below -30°C — at -35°C with any wind, frostbite risk accelerates significantly on hands and feet
• A minimum 18-hour clear window — from Camp 2 departure (~midnight) to descent back to Camp 2 (~early afternoon)
In a typical October season, 2–3 windows of this quality occur. The expeditions that succeed are the ones positioned to move when the window opens — with their acclimatisation complete, their team rested, and their Sirdar confident in the forecast. This is why the expedition timeline matters as much as the season.
India Flight Coordination — Planning Your Departure Around the Weather Calendar
This is the section that no weather guide covers — and the most practical information for Indian climbers who are balancing corporate leave with Himalayan expedition timing.
The October Leave Calendar Problem
Most Indian corporate professionals get Dussehra (Navratri/Vijaya Dashami) and Diwali as mandatory leave, typically in October. In 2025, Dussehra fell on 2 October and Diwali on 20 October — giving Indian climbers a natural leave cluster in October that aligns almost perfectly with Ama Dablam's prime summit window. In 2026, Dussehra falls on 22 October — the middle of the prime window.
This alignment is not coincidental — it is why October Ama Dablam expeditions fill up with Indian climbers first. The challenge is that everyone is trying to book the same dates, which means early booking is essential. Autumn 2025 spots at Trekyaari filled by May 2025. Autumn 2026 spots are filling now.
Expedition Date | Kathmandu Arrival | Summit Window (typical) | India Departure | Return to India | Leave Required |
Autumn 2025 (Oct) | 1–3 October | 20–28 October | Late September | Mid November | ~45–50 days total |
Autumn 2025 (Nov) | 1–5 November | 18–28 November | Late October | Early December | ~40–45 days total |
Spring 2026 (Apr) | 1–5 April | 20–30 April | Late March | Mid May | ~45 days total |
Spring 2026 (May) | 1–5 May | 18–28 May | Late April | Mid June | ~45 days total |
Autumn 2026 (Oct) | 1–5 October | 20–28 October | Late September | Mid November | ~45–50 days total |
Booking Your India-to-Kathmandu Flights
Delhi–Kathmandu: IndiGo, Air India, SpiceJet, and Himalaya Airlines all operate this route. Flight time is 1.5 hours. Return fares typically run ₹8,000–₹20,000 depending on booking timing. Book 3–4 months in advance for October — the Delhi–KTM route fills fast in September/October with trekking and expedition groups.
Mumbai, Bengaluru, Chennai: Connect to Delhi and then KTM, or fly direct via IndiGo or Air India direct routes. Total journey time 4–7 hours depending on connection. Budget ₹12,000–₹30,000 return from southern Indian cities.
Practical tip: Build a 2-day Kathmandu buffer on both arrival and departure. Lukla flights are weather-dependent and frequently delayed or cancelled. Arriving 2 days before your planned Lukla departure means a cancellation is an inconvenience, not an expedition-ending problem. The same buffer on return prevents a missed international connection.
The Lukla Flight Factor
Tenzing-Hillary Airport at Lukla (2,860m) operates only in good visibility — no instrument approaches, no night operations. In October, Lukla flights are generally reliable but delays of 1–2 days are common. Budget for this in your leave plan. The alternative (helicopter from Kathmandu to Lukla or directly to the Khumbu) costs approximately USD 300–500 but bypasses the weather dependency — worth knowing about as a contingency.
Weather Apps and Tools — What Indian Climbers Should Use
During an Ama Dablam expedition, you will not be making weather decisions yourself — your Sirdar and the Trekyaari team will do that with professional meteorological support. But understanding what the forecasts say — and being able to read them yourself — is genuinely useful. Here are the tools worth knowing:
Tool | What It Shows | How to Use It | Cost |
Mountain Forecast (mountain- forecast.com) | Point forecasts at specific elevations — 5,000m and 6,800m options for Ama Dablam | Check temperature, wind, and precipitation at Camp 2 altitude and summit altitude specifically | Free |
Wind pattern visualisation — excellent for seeing jet stream position and movement | Set the altitude layer to 300hPa (approximately 9,000m) to see jet stream; 500hPa for Ama Dablam summit level | Free | |
Meteoblue | Historical climate data and 7-day forecast | Best for understanding typical patterns — use the climate section for month-by-month planning | Free basic |
Meteotest (commercial) | Professional-grade mountain meteorology used by major expedition operators | Your operator subscribes — not a DIY tool | Paid (operator uses) |
India Meteorological Department app | Monsoon tracking — useful for predicting withdrawal timing | Track the monsoon retreat from Bengal and Bihar toward Nepal in September | Free |
One honest note: even the best forecast models have 48–72 hour reliable accuracy at Himalayan altitudes. Beyond 72 hours, treat forecasts as directional guidance, not certainty. The go/no-go decision on summit day is always made on the most current 24–48 hour data — not on what the forecast said when you left Kathmandu.
2025 Season — What the Weather Actually Did
For Indian climbers planning 2026 expeditions, understanding what the 2025 seasons delivered is useful context.
Spring 2025 (April–May): Generally good conditions through April with multiple solid windows. May was slightly more unsettled than typical, with pre-monsoon cloud building earlier than historical average. Most expeditions targeting late April/early May summits had good outcomes. Martin Hornegger died in a fall during descent in late April — unrelated to weather conditions.
Autumn 2025 (October–November): October opened well with stable post-monsoon conditions. A significant weather event in late October — storm activity linked to Cyclone Montha in the Bay of Bengal — disrupted the Everest region for several days, grounding Lukla flights and affecting high camp conditions across the Khumbu. The 2025 autumn season saw three deaths on Ama Dablam, with two occurring in October during and after this storm period. Expeditions that moved before the storm had good outcomes; those caught in it faced significantly more challenging conditions. This underlines the importance of flexible itineraries and operators with real-time meteorological support.
What to Wear at Each Weather Stage — Practical Layering Guide
Stage of Expedition | Temperature Context | Clothing Needed | Common Mistake |
Lukla to Namche Bazaar (approach) | Warm to moderate — +8°C to +18°C day | Light layers — shirt, light fleece, trekking trousers. Down jacket for evenings. | Over-dressing — you will sweat on the Namche climb. Light layers are correct. |
Namche to Base Camp (approach) | Cooling — +5°C to +12°C day | Fleece layer, softshell, light down jacket for stops and evenings. | Under-preparing for wind above Tengboche — add windproof layer above 3,800m. |
Base Camp life | Variable — 0°C to +12°C day | Full mid-layer system. Down jacket always accessible. Thermal base for evenings. | Spending too much time cold at BC depletes energy before the climb starts. |
Camp 1 (5,800m) | Cold — -2°C to +5°C day | Full layering system. Down jacket as standard. Expedition gloves for morning. | Forgetting that Camp 1 at night is -15°C to -20°C — full expedition sleeping bag required. |
Camp 2 (6,000m) | Very cold — -5°C to +2°C day | All layers, expedition mitts, balaclava always accessible. | Removing down suit for comfort — temperature drops fast here, put it back on. |
Summit push (midnight) | Extreme — -15°C to -28°C | Full down suit, expedition mitts, balaclava, glacier glasses, all insulation layers. | Leaving a layer at Camp 2 to save weight — you will need every layer on the arêtes. |
Spring vs Autumn — Which Season Is Better for Indian Climbers?
Both seasons have merits. The choice depends as much on India's leave calendar as on the mountain's weather patterns.
Factor | Autumn (Oct–Nov) | Spring (Apr–May) | Better For Indians |
Peak weather window | October — outstanding | April — excellent | Roughly equal |
Temperature at Base Camp | Cooling through season | Warming through season | Spring (warmer BC) |
Summit conditions | Firm, cold, clear | Consolidating snow, good | Autumn (firmer snow) |
Crowd level | High — peak commercial season | Moderate — less busy | Spring (quieter) |
India leave alignment | Dussehra/Diwali — natural fit | April — Baisakhi, Ram Navami, Good Friday cluster | Autumn (better leave fit) |
Flight availability Delhi–KTM | Book early — fills fast | Easier to book | Spring (easier logistics) |
Rhododendron/scenery on approach | Autumn colours, clear views | Rhododendrons in bloom | Draw |
Post-expedition recovery | Back in India before Diwali possible | Back before summer heat | Autumn (timing works better) |
Overall recommendation | Primary season for Indian climbers | Strong alternative if Oct not possible | Autumn slightly preferred |
Conclusion
Ama Dablam's weather is not a mystery — it follows patterns that have been studied for decades and that experienced operators understand well. October is the best month. April is the second best. The window within October that matters most is the 10th to the 25th. The jet stream is the variable that most affects late-season attempts. The monsoon withdrawal is the event that creates the post-monsoon clarity Indian climbers know intuitively from their own subcontinent experience.
For Indian climbers, the weather calendar and the leave calendar converge in October in a way that makes the autumn season the natural choice. Dussehra and Diwali give you the leave structure. The post-monsoon Khumbu gives you the weather. Your job is to book early enough that a spot exists when you are ready to go.
Read our complete Ama Dablam expedition guide for the full picture of the expedition. For the altitude and oxygen data at each camp, read our Ama Dablam height and elevation guide. And for the complete day-by-day itinerary with weather context built in, read our Ama Dablam 28-day itinerary guide.