Mountain·India

Thalay Sagar

6,904m

Gangotri Group

Summit weather

Kailas98 · CC BY-SA 3.0 · Wikimedia Commons

Elevation: 6,904m
Relief: 2,668mabove the lowest point within 5 km
Steepest slope: 68°within 1 km of the summit
Snow at the summit: All yearSee month by month ↓
Summit: 30.8608°N, 78.9956°E

Peak of Gangotri group of mountains

Thalay Sagar is a mountain in the Gangotri Group (India). Its summit stands 6,904 m above sea level.

From the lowest point within 5 km (4,236 m), it rises 2,668 m. The steepest side is the north-west face: 54° on average over the first kilometre. In places the ground near the top reaches 68° — terrain for climbers, not walkers.

Thalay Sagar for skiers and climbers

Two scores out of 10, built only from open data — every part is shown. They describe what the mountain offers, not how safe it is.

Hiking & mountaineering

4.2/10

Difficulty to the top

Expedition

Above 6,500 m: an expedition peak (altitude, logistics, often permits). Glaciers around the top.

Indicative only — never a safety assessment. Conditions change: ask local guides and check the forecast.

0.5/2.51 waymarked routes and 1 path sections nearby
0.0/1.50 huts and shelters
2.0/22,668 m of ascent from the valley
1.4/1.51,601 m of prominence
0.0/1.50 months with summit afternoons above −5 °C
0.3/1via ferratas, climbing and glaciers

Ski score

—

No ski runs within 12 km in OpenStreetMap.

How these scores are made

Ski (where OpenStreetMap has skiing within 12 km): up to 4 points for the length of downhill runs (300 km or more = 4), 1.5 for the number of lifts (40+), 1.5 for the vertical between lift stations (1,500 m) and 3 for the snow season — a month counts when the estimated mean temperature at the height of the ski area is −1 °C or lower and snow falls or lies there (NASA POWER, 2001–2020). Hiking & mountaineering: up to 2.5 for waymarked routes and paths, 1.5 for huts, 2 for the ascent from the valley (2,000 m), 1.5 for prominence (3,000 m), 1.5 for the season (months with summit afternoons above −5 °C) and 1 for via ferratas, climbing and glaciers. OpenStreetMap is built by volunteers: where few things are mapped, a score can be lower than reality.

Plan your visit

Stay, climb and get there

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Snow

When there is snow on Thalay Sagar

At the summit, snow all year round. Month by month below, at different heights on the way up.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Summit6,904 msnow all year round	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month
Halfway up5,570 msnow all year round	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month
Foot of the mountain4,236 msnow from February to May (some years from December to May)	Snow some of the time	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	Snow on the ground all month	No snow	No snow	No snow	No snow	Snow some of the time	No snow	Snow some of the time

Snow on the ground all month
Snow some of the time
No snow
This month

Estimate for a normal year: average temperature and precipitation from NASA POWER, carried to each height, in a simple model of snow building up and melting. In a given year snow can come earlier or stay longer. It does not replace the local snow and avalanche bulletin.

Summit weather

Thalay Sagar, month by month

Not a forecast: long-term averages (1991–2020), carried up to the summit. The orange line is where an average afternoon reaches 0 °C; above the dashed blue line it freezes even at dawn.

On an average July afternoon the summit reaches about -5 °C; on January nights it falls to about -33 °C. Even in the warmest month the summit stays below freezing all day: ice and snow all year round. Even at its highest, in July, the 0 °C line reaches only about 6,090 m: 814 m below the summit. Across the region, November is the driest month (6 mm) and July the wettest (256 mm).

0 °C on an average afternoon 0 °C at dawn the summit

Month	Summit high °C	Summit low °C	0 °C line (m)	Rain & snow (mm)	Wet days	Sun h/day
January	-23	-33	3,370	34	4	5.0
February	-22	-32	3,600	41	5	4.8
March	-18	-29	4,210	35	5	7.1
April	-13	-24	4,950	28	4	8.5
May	-9	-20	5,550	40	6	9.6
June	-6	-16	6,000	123	13	9.1
July	-5	-13	6,090	256	24	7.8
August	-6	-13	5,970	252	25	7.6
September	-8	-17	5,630	121	14	8.5
October	-13	-23	4,900	14	2	9.3
November	-17	-27	4,320	6	1	8.4
December	-20	-30	3,770	12	2	7.1

Estimate: the NASA POWER climate of a ~55 km cell (average height 4,043 m), adjusted to the summit by −6.5 °C per 1,000 m. Rain, wet days and sunshine are those of the region. Mountain weather changes fast — always check a local forecast. ★ = mildest months at the top.

Relief

The mountain in profile

Two cuts through the summit, 16 km long, from the 30 m Copernicus elevation model. True scale: no vertical exaggeration.

West – east

South – north

Steepness by direction

Average slope of the first kilometre from the summit. The orange petal is the steepest side.

Around the mountain

Huts, lifts and trails around Thalay Sagar

Counted around the summit in OpenStreetMap, the map anyone can edit. The satellite plate shows 14 × 14 km.

Thalay Sagar seen from above (Sentinel-2)

N 5 km

Other summitsGlaciersCampsites

Sentinel-2 cloudless 2016 (EOX, CC BY 4.0), 14 × 14 km, north up. Points © OpenStreetMap contributors.

—mountain huts and shelters
—cable cars, gondolas, chairlifts and rack railways
—ski areas
1waymarked hiking routes
Gangotri to Khatling
—via ferratas
—climbing crags and routes
9named glaciers
Kirti Bamak, Chorabari Glacier, Kedar Dome Glacier, Gangotri Glacier and 5 more
—viewpoints
4campsites
Tapovan
—hotels, B&Bs and chalets
—restaurants and cafés

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OpenStreetMap is built by volunteers: a low number may just mean nobody has mapped it yet. Places © OpenStreetMap contributors (ODbL).

Photos

Seen by climbers and visitors

Thalay Sagar Bhrigupanth Kirti Sthambh and Bharte Kunta — Goutam1962 · CC BY-SA 4.0

Thalaysagar — Soumit ban at English Wikipedia · CC BY-SA 3.0

Recent years

How each month compared at the summit

Afternoon high at the summit (estimate). The first row is the reference, the 1991–2020 average in °C; the years show only the difference.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
1991–2020 average	-23	-22	-18	-13	-9	-6	-5	-6	-8	-13	-17	-20
2020	−2.3	±0.0	−2.3	−2.6	−1.9	−0.8	+0.6	+1.1	+2.0	+2.6	−0.8	−1.1
2021	+1.7	+2.1	+1.9	−1.4	−2.5	−0.3	+0.9	+0.6	+1.2	+1.3	+0.4	−1.3
2022	−1.4	−1.6	+3.5	+3.1	+0.2	+0.6	+0.5	+0.7	+0.5	−0.2	±0.0	+0.6
2023	+0.2	+2.6	−0.8	−2.6	−3.1	−1.2	±0.0	+1.1	+1.4	±0.0	+0.2	+1.6
2024	+1.7	−1.3	−0.9	−0.8	+1.4	+1.4	+1.5	+0.4	+1.7	+2.2	+2.1	−0.1
2025	+2.2	+0.5	−0.2	+1.6	+0.1	+0.6	+0.4	+0.2	+1.6	+0.5	+0.2	+2.4

+1 warmer than usual −1 cooler than usual

Nearby

More mountains nearby

About these numbers

Names, elevation, prominence	Wikidata (Q686996) · CC0
Relief, 3D view, profiles	Copernicus DEM GLO-30 · © DLR e.V., © Airbus Defence and Space GmbH, Copernicus/ESA
Climate	NASA POWER, 1991–2020 · CC BY 4.0
Around the mountain	© OpenStreetMap contributors · ODbL
Images	EOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons

Every figure is an average, an estimate or a count from a public dataset. Licences and methods: data sources.

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