Sierre climate — normals and trends
Sierre (Switzerland) has a subarctic climate (Dfc) under the Köppen-Geiger classification. Its mean annual temperature is 1.2 °C and it receives 1,364 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (11.8 °C on average) and the coldest is January (-10.1 °C). Rainfall peaks in May.
Sierre averages 225 frost days, 0 hot days (≥ 30 °C) and 167 rainy days per year.
Sierre has warmed by +3.2 °C between 1940 and 2025, or +0.37 °C per decade. This trend is statistically significant.
The number of frost days there went from about 255 to 195 per year over the period.
The hottest day of the period reached 28.1 °C (on 19 July 2022) and the coldest -36.2 °C (on 7 January 1985).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
SierreValais
- coords
- 46.29°, 7.54°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
1.2°C
Average daily high
5.9°C
Average daily low
-3.7°C
Annual rainfall
1,364mm
Sunshine / day
9.1h
Mean relative humidity
75%
Average peak wind
6.7km/h
Seasonal range
21.9°C
Frost days (< 0 °C)
225 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
167 d/yr
Annual snowfall
529.5 cm
Average feels-like high
3.6 °C
Average feels-like low
-6.9 °C
Average peak gust
35.2 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
14.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.2 °C
since 1940
+0.4 °C per decade · r² = 0.65 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
28.1 °C
19 July 2022
Coldest day
-36.2 °C
7 January 1985
Wettest day
85 mm
27 September 1942
Windiest day
16.2 km/h
27 February 1990
Strongest gust
151.9 km/h
27 February 1990
Hottest feels-like
28.2 °C
5 July 1957
Coldest feels-like
-41.4 °C
7 January 1985
Snowiest day
54.2 cm
14 February 1990
Sunniest day
15.0 h
20 May 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -3.5 °C | +2.7 °C | 112 mm | +1 mm |
| Feb | 1.0 °C | +3.5 °C | 28 mm | -76 mm |
| Mar | 4.6 °C | +2.9 °C | 53 mm | -53 mm |
| Apr | 9.8 °C | +4.8 °C | 144 mm | +35 mm |
| May | 11.3 °C | +2.0 °C | 170 mm | +46 mm |
| Jun | 20.4 °C | +6.5 °C | 63 mm | -60 mm |
| Jul | 16.9 °C | -0.1 °C | 139 mm | +15 mm |
| Aug | 19.6 °C | +2.9 °C | 116 mm | -6 mm |
| Sep | 13.5 °C | 0.0 °C | 210 mm | +109 mm |
| Oct | 8.8 °C | +0.5 °C | 124 mm | +22 mm |
| Nov | 3.0 °C | +2.9 °C | 96 mm | -24 mm |
| Dec | 1.4 °C | +7.2 °C | 35 mm | -85 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Sierre?
Sierre has a subarctic climate (Köppen Dfc). Over 1940-2025, the average annual temperature is 1.2 °C and it receives 1,364 mm of precipitation per year.
What is the hottest day ever recorded in Sierre?
The hottest day measured in Sierre between 1940 and 2025 was 19 July 2022, reaching 28.1 °C.
What is the coldest day in Sierre?
The coldest day measured in Sierre between 1940 and 2025 was 7 January 1985, at -36.2 °C.
Does it snow in Sierre?
Yes. Sierre gets on average 529.5 cm of snow per year and has around 225 frost days.
Has the climate of Sierre warmed?
Yes: Sierre warmed by +3.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sierre?
The wettest day measured in Sierre between 1940 and 2025 was 27 September 1942, with 85 mm of rain in 24 hours.
What was the windiest day in Sierre?
The windiest day measured in Sierre between 1940 and 2025 was 27 February 1990, with winds reaching 16.2 km/h.
What is the warmest month in Sierre?
The warmest month in Sierre is July (11.8 °C on average); the coldest is January (-10.1 °C).
How much does it rain in Sierre?
Sierre receives on average 1,364 mm of precipitation per year, spread over about 167 rainy days.
Is it sunny in Sierre?
Sierre gets on average 9.1 hours of sunshine per day, roughly 3,322 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sierre?
The heaviest 24-hour snowfall measured in Sierre between 1940 and 2025 was 14 February 1990, with 54.2 cm.
Are there tropical nights in Sierre?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Sierre.
What was the most extreme apparent temperature in Sierre?
In Sierre, between 1940 and 2025, the highest apparent temperature reached 28.2 °C on 5 July 1957, and the lowest was -41.4 °C on 7 January 1985.
Compare Sierre with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sierre