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Contents
- The climate of Chamonix
- The best time to visit Chamonix
- The worst time to visit Chamonix
- Spring weather in Chamonix
- Summer weather in Chamonix
- Autumn weather in Chamonix
- Winter weather in Chamonix
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Chamonix
Chamonix features a Subarctic climate according to the Köppen climate classification, classified as Dfc. This indicates severe winters, cool summers, and no dry season associated with its geographical location.
Commencing with temperature, the annual highs range from -2.3°C (27.9°F) during the coldest months to 16.8°C (62.2°F) during the warmest months. Low temperatures follow a similar pattern, registering a low of -11.4°C (11.5°F) to a warmer 6.7°C (44.1°F), painting a picture of a place with a wide temperature amplitude. Weather behavior with respect to humidity varies less, seeing a year-low of 77% to a year-high of 91%.
Rainfall in Chamonix is an element worthy of attention. The volume of rainfall registers at 15mm (0.59") during the driest month but sees a considerable spike reaching up to 72mm (2.83") in December, the wettest month. With respect to snowfall, the situation is quite striking. There is no snowfall from June to September. However, in December, the region is blanketed under a snowfall of 245mm (9.65"), making it the month with the highest snowfall.
Daylight hours fluctuate between 8.7 hours in December, the month with the shortest day, and 15.7 hours in June, the month with the longest day. Sunshine is somewhat proportional to daylight, with the peak sunshine hours reaching 10.3 hours in July. The variation of cloud cover is not substantial throughout the year, varying from 35% to 51%.
Commencing with temperature, the annual highs range from -2.3°C (27.9°F) during the coldest months to 16.8°C (62.2°F) during the warmest months. Low temperatures follow a similar pattern, registering a low of -11.4°C (11.5°F) to a warmer 6.7°C (44.1°F), painting a picture of a place with a wide temperature amplitude. Weather behavior with respect to humidity varies less, seeing a year-low of 77% to a year-high of 91%.
Rainfall in Chamonix is an element worthy of attention. The volume of rainfall registers at 15mm (0.59") during the driest month but sees a considerable spike reaching up to 72mm (2.83") in December, the wettest month. With respect to snowfall, the situation is quite striking. There is no snowfall from June to September. However, in December, the region is blanketed under a snowfall of 245mm (9.65"), making it the month with the highest snowfall.
Daylight hours fluctuate between 8.7 hours in December, the month with the shortest day, and 15.7 hours in June, the month with the longest day. Sunshine is somewhat proportional to daylight, with the peak sunshine hours reaching 10.3 hours in July. The variation of cloud cover is not substantial throughout the year, varying from 35% to 51%.
The best time to visit Chamonix
The suitable time to visit Chamonix depends largely on the activities one wants to undertake. For individuals inclined towards warmer temperatures and outdoor activities, the period between June and September offers the highest temperatures with moderate rainfall. During this period, the average high temperature ranges between 12.8°C (55°F) and 16.8°C (62.2°F) while rainfall is between 15mm (0.59") and 49mm (1.93"). It is also the period with extended daylight hours and lower cloud coverage, ideal conditions for outdoor explorations.
The worst time to visit Chamonix
Adversely, the most challenging time to visit Chamonix is during the winter months of November through February. These months are extremely cold with average high temperatures ranging between -2.3°C (27.9°F) and 2.7°C (36.9°F), and low temperatures from -11.4°C (11.5°F) to -4.5°C (23.9°F).
Spring weather in Chamonix
Between March and May, Chamonix experiences spring. The temperatures rise from a high of 0.8°C (33.4°F) in March to 8.8°C (47.8°F) in May. Corresponding low temperatures warm up from -7.4°C (18.7°F) to 0.5°C (32.9°F) over the same period. Rainfall goes from 43mm (1.69") in March to 58mm (2.28") in May, while snowfall decreases significantly from 194mm (7.64") to 18mm (0.71") respectively.
Summer weather in Chamonix
Characterized by high temperatures and extended daylight hours, summer in Chamonix starts in June and ends in August. During this period, temperatures range from 12.8°C (55°F) to 16.8°C (62.2°F) with low temperatures from 4.6°C (40.3°F) to 6.7°C (44.1°F). Rainfall is moderate with ranges of 37mm (1.46") to 49mm (1.93"), while there is absence of snowfall.
Autumn weather in Chamonix
Autumn months, from September to November, experience a drop in temperatures with highs falling from 12.8°C (55°F) in September to 2.7°C (36.9°F) in November. Corresponding low temperatures drop from 3.6°C (38.5°F) to -4.5°C (23.9°F) respectively. Rainfall increases from 15mm (0.59") in September to 35mm (1.38") in November, whereas snowfall starts from zero in September, steadily increasing to 66mm (2.6") in November.
Winter weather in Chamonix
The winter season in Chamonix comes with severe cold and extensive snowfall. From December to February, temperatures fall to the lowest in the year, with high temperatures between -2.3°C (27.9°F) and -1°C (30.2°F) and corresponding low temperatures from -11.4°C (11.5°F) to -9.5°C (14.9°F). Snowfall reaches its peak in this period, particularly in December with a recorded 245mm (9.65").
Weather in January
January witnesses weather conditions typical of a winter month in Chamonix, France. The frigid air is often accompanied by significant snowfall, making it apt for winter sports. The highest temperature usually does not exceed -2.3°C (27.9°F), while the lows can reach up to -11.4°C (11.5°F). Weather in January »
Weather in February
February in Chamonix maintains the winter season's chill, although slightly less intense than January. The frosty conditions continue, most notably in the evenings and at night. Reprieve comes in the form of increasing daylight hours, hinting at the approaching end of winter. Weather in February »
Weather in March
March signals the first whispers of spring in Chamonix, with temperatures moderately rising from those in February. Sunlight begins to break through the icy haze, and the snow underfoot slowly starts to thin. March witnesses maximum snowfall, with up to 194mm (7.64") of snow accumulation. Weather in March »
Weather in April
By April, Chamonix transitions into the full bloom of spring. The weather becomes milder yet remains unpredictable with occasional rain showers and fluctuating temperatures. Amidst the blossoming flowers, temperatures range from 5.3°C (41.5°F) during the day to -2.8°C (27°F) at night. Weather in April »
Weather in May
May in Chamonix sees a consistent rise in temperatures and longest daylight hours in the year, marking the arrival of late spring. The town dresses up in lush green as the last traces of the winter snow melt away. Expect the highest temperatures during the day to touch 8.8°C (47.8°F). Weather in May »
Weather in June
June brings the beginnings of summer weather to Chamonix, with longer days and warmer temperatures. The dwindling rainfall characterizes a shift toward drier weather conditions but also makes for less humidity. As temperatures go up to 14.3°C (57.7°F) in the day, it forms excellent conditions for open-air activities. Weather in June »
Weather in July
July is the height of summer in Chamonix, bringing the most favorable weather of the year. The relative humidity is at its lowest, providing clear skies and comfortable conditions for outdoor activities. July's peak daytime temperature climbs up to 16.8°C (62.2°F). Weather in July »
Weather in August
August continues the trend of warm summer weather, with daytime temperatures mirroring those of July, holding at 16.8°C (62.2°F). The summer suites various outdoor activities, ranging from hikes to mountain biking and paragliding. Weather in August »
Weather in September
With September's arrival, Chamonix sees the beginning of autumn. Temperatures begin to drop, signaling the gradual change into the colder months. The peak daytime temperature decreases to 12.8°C (55°F), but the overall weather remains pleasant. Weather in September »
Weather in October
October witnesses a more significant drop in temperatures, as Chamonix descends firmly into autumn. The change of season brings forward a unique blend of picturesque landscapes, chilly temperatures, and striking fall colorations. Weather in October »
Weather in November
November ushers in the beginning of winter weather in Chamonix. The town sees a drop in temperature, hinting at the severe cold to follow. As the temperatures hover from 2.7°C (36.9°F) during the day to -4.5°C (23.9°F) at night, the first snows start to fall. Weather in November »
Weather in December
By December, Chamonix unconditionally settles into the winter season. The temperatures plunge, and the landscape is enveloped in a cloak of snow. December receives the maximum snowfall, about 245mm (9.65"), indicating a promising ski season ahead. Weather in December »
[Resources]Frequently asked questions
What part of the year is the coldest in Chamonix?
In Chamonix, January records the average lowest temperatures, peaking at -2.3°C (27.9°F) and reaching a low of -11.4°C (11.5°F).
How many days does it rain in Chamonix?
Throughout the year, in Chamonix, France, there are 132.8 rainfall days, and 461mm (18.15") of precipitation is accumulated.
When does it snow in Chamonix?
Months with snowfall are January through May, October through December.
How much does it snow in Chamonix?
Throughout the year, in Chamonix, France, there are 56.7 snowfall days, and 924mm (36.38") of snow is accumulated.
What is the month with the lowest UV index in Chamonix?
January through March and November, with an average maximum UV index of 1, are months with the lowest UV index.
What is the most humid month in Chamonix?
With an average relative humidity of 91%, March is the most humid month.
When it does not snow in Chamonix?
June through September are months without snowfall.
When are the longest days in Chamonix?
June has the longest days of the year in Chamonix, France, with an average of 15h and 42min of daylight.
What are the months with the highest UV index in Chamonix?
June and July, with an average maximum UV index of 4, are months with the highest UV index.
What month is the hottest in Chamonix?
Chamonix's warmest period falls in July and August, when the average high-temperatures ascend to 16.8°C (62.2°F).
What month has the most sunshine in Chamonix?
The month with the most sunshine in Chamonix is July, with an average of 10.3h of sunshine.
What is the least humid month in Chamonix?
The least humid month in Chamonix, France, is August, with an average relative humidity of 77%.
What is the driest month in Chamonix?
September is the month with the least rainfall in Chamonix, France. Rain falls for 11.4 days and accumulates 15mm (0.59") of precipitation.
When is Daylight Saving Time (DST) in Chamonix?
On Sunday, 27. October 2024, at 03:00, Daylight Saving Time ends, and the time zone changes from CEST to CET. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 02:00, and the time zone reverts from CET to CEST.
What is the wettest month in Chamonix?
December is the month with the most rainfall in Chamonix. Rain falls for 7.7 days and accumulates 72mm (2.83") of precipitation.
What is the snowiest month in Chamonix?
December is the month with the most snowfall. Snow falls for 10.4 days and accumulates 245mm (9.65") of snow.
What is the month with the shortest days in Chamonix?
With an average of 8h and 42min of daylight, December has the shortest days of the year in Chamonix, France.
What is the month with the least sunshine in Chamonix?
With an average of 4.8h of sunshine, December has the least sunshine of the year.
Average temperature
Chamonix, France
The warmest months (with the highest average high temperature) are July and August (16.8°C).
The month with the lowest average high temperature is January (-2.3°C).
The month with the highest average low temperature is July (6.7°C).
The coldest month (with the lowest average low temperature) is January (-11.4°C).
Average pressure
Chamonix, France
- Average pressure in January:
1019.2mbar - Average pressure in February:
1017.2mbar - Average pressure in March:
1016.6mbar - Average pressure in April:
1015.1mbar - Average pressure in May:
1015.6mbar - Average pressure in June:
1016.1mbar
- Average pressure in July:
1016.7mbar - Average pressure in August:
1017.5mbar - Average pressure in September:
1018.1mbar - Average pressure in October:
1018.2mbar - Average pressure in November:
1015.8mbar - Average pressure in December:
1020.9mbar
The month with the highest atmospheric pressure is December (1020.9mbar).
The month with the lowest atmospheric pressure is April (1015.1mbar).
Average wind speed
Chamonix, France
- Average wind speed in January:
8.1km/h - Average wind speed in February:
8.2km/h - Average wind speed in March:
8.2km/h - Average wind speed in April:
7.4km/h - Average wind speed in May:
7.3km/h - Average wind speed in June:
7.1km/h
- Average wind speed in July:
6.9km/h - Average wind speed in August:
6.6km/h - Average wind speed in September:
6.5km/h - Average wind speed in October:
7.6km/h - Average wind speed in November:
8.3km/h - Average wind speed in December:
8.4km/h
The windiest month (with the highest average wind speed) is December (8.4km/h).
The calmest month (with the lowest average wind speed) is September (6.5km/h).
Average humidity
Chamonix, France
The month with the highest relative humidity is March (91%).
The month with the lowest relative humidity is August (77%).
Average rainfall
Chamonix, France
The wettest month (with the highest rainfall) is December (72mm).
The driest month (with the least rainfall) is September (15mm).
Average rainfall days
Chamonix, France
- Average rainfall days in January:
6.8 days - Average rainfall days in February:
5.9 days - Average rainfall days in March:
9.3 days - Average rainfall days in April:
14.6 days - Average rainfall days in May:
15.3 days - Average rainfall days in June:
16.2 days
- Average rainfall days in July:
15.3 days - Average rainfall days in August:
12.8 days - Average rainfall days in September:
11.4 days - Average rainfall days in October:
8 days - Average rainfall days in November:
9.5 days - Average rainfall days in December:
7.7 days
The month with the highest number of rainy days is June (16.2 days).
The month with the least rainy days is February (5.9 days).
Average snowfall
Chamonix, France
- Average snowfall in January:
183mm - Average snowfall in February:
149mm - Average snowfall in March:
194mm - Average snowfall in April:
63mm - Average snowfall in May:
18mm - Average snowfall in June:
0mm
The month with the highest snowfall is December (245mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days
Chamonix, France
- Average snowfall days in January:
12.6 days - Average snowfall days in February:
11.8 days - Average snowfall days in March:
8.9 days - Average snowfall days in April:
4 days - Average snowfall days in May:
1.3 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.1 days - Average snowfall days in October:
0.9 days - Average snowfall days in November:
6.7 days - Average snowfall days in December:
10.4 days
The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight / Average sunshine
Chamonix, France
- Average daylight in January:
9h and 1min - Average daylight in February:
10h and 2min - Average daylight in March:
11h and 5min - Average daylight in April:
13h and 4min - Average daylight in May:
15h and 0min - Average daylight in June:
15h and 4min
- Average daylight in July:
15h and 2min - Average daylight in August:
14h and 1min - Average daylight in September:
12h and 3min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 3min - Average daylight in December:
8h and 4min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in January:
4h and 5min - Average sunshine in February:
5h and 2min - Average sunshine in March:
5h and 5min - Average sunshine in April:
8h and 1min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 5min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 3min - Average sunshine in October:
6h and 5min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
Average sunshine days
Chamonix, France
- Average sunshine days in January:
16.3 days - Average sunshine days in February:
15.3 days - Average sunshine days in March:
15.7 days - Average sunshine days in April:
11.7 days - Average sunshine days in May:
11.4 days - Average sunshine days in June:
10.3 days
- Average sunshine days in July:
11.8 days - Average sunshine days in August:
14.2 days - Average sunshine days in September:
15.3 days - Average sunshine days in October:
20.5 days - Average sunshine days in November:
16.3 days - Average sunshine days in December:
16.7 days
The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is June (10.3 days).
Average UV index
Chamonix, France
The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are January, February, March and November (UV index 1).
Average cloud cover
Chamonix, France
The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility
Chamonix, France
The months with the highest visibility are June, July, August and October (8km).
The months with the lowest visibility are January, February and March (6km).
Chamonix, France
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