Sumiswald climate — normals and trends
Sumiswald (Switzerland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.9 °C and it receives 1,283 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 (17.1 °C on average) and the coldest is January (-1.4 °C). Rainfall peaks in August.
Sumiswald averages 108 frost days, 2 hot days (≥ 30 °C) and 180 rainy days per year.
Sumiswald has warmed by +2.7 °C between 1940 and 2025, or +0.32 °C per decade. This trend is statistically significant.
The number of frost days there went from about 135 to 81 per year over the period.
The hottest day of the period reached 34.0 °C (on 7 July 2015) and the coldest -26.9 °C (on 19 January 1940).
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
SumiswaldCanton of Bern
- coords
- 47.03°, 7.75°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.9°C
Average daily high
11.9°C
Average daily low
4.1°C
Annual rainfall
1,283mm
Sunshine / day
8.7h
Mean relative humidity
78%
Average peak wind
9.1km/h
Seasonal range
18.5°C
Frost days (< 0 °C)
108 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
180 d/yr
Annual snowfall
183.5 cm
Average feels-like high
10.3 °C
Average feels-like low
1.9 °C
Average peak gust
29.0 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.7 °C
since 1940
+0.3 °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
34.0 °C
7 July 2015
Coldest day
-26.9 °C
19 January 1940
Wettest day
71 mm
27 September 1942
Windiest day
34.8 km/h
26 December 1999
Strongest gust
128.2 km/h
26 December 1999
Hottest feels-like
36.8 °C
26 June 2019
Coldest feels-like
-31.8 °C
19 January 1940
Snowiest day
20.7 cm
9 February 1999
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 | 4.3 °C | +2.6 °C | 111 mm | +22 mm |
| Feb | 5.5 °C | +1.7 °C | 41 mm | -45 mm |
| Mar | 10.8 °C | +2.8 °C | 65 mm | -27 mm |
| Apr | 15.2 °C | +3.6 °C | 93 mm | -13 mm |
| May | 16.9 °C | +1.0 °C | 156 mm | +30 mm |
| Jun | 24.8 °C | +5.2 °C | 82 mm | -50 mm |
| Jul | 22.0 °C | +0.3 °C | 183 mm | +50 mm |
| Aug | 24.0 °C | +2.8 °C | 181 mm | +47 mm |
| Sep | 17.8 °C | 0.0 °C | 163 mm | +60 mm |
| Oct | 12.5 °C | -0.3 °C | 109 mm | +21 mm |
| Nov | 7.5 °C | +1.1 °C | 117 mm | +18 mm |
| Dec | 4.5 °C | +2.0 °C | 25 mm | -70 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 Sumiswald?
Sumiswald has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.9 °C and it receives 1,283 mm of precipitation per year.
What is the hottest day ever recorded in Sumiswald?
The hottest day measured in Sumiswald between 1940 and 2025 was 7 July 2015, reaching 34.0 °C.
What is the coldest day in Sumiswald?
The coldest day measured in Sumiswald between 1940 and 2025 was 19 January 1940, at -26.9 °C.
Does it snow in Sumiswald?
Yes. Sumiswald gets on average 183.5 cm of snow per year and has around 108 frost days.
Has the climate of Sumiswald warmed?
Yes: Sumiswald warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sumiswald?
The wettest day measured in Sumiswald between 1940 and 2025 was 27 September 1942, with 71 mm of rain in 24 hours.
What was the windiest day in Sumiswald?
The windiest day measured in Sumiswald between 1940 and 2025 was 26 December 1999, with winds reaching 34.8 km/h.
What is the warmest month in Sumiswald?
The warmest month in Sumiswald is July (17.1 °C on average); the coldest is January (-1.4 °C).
How much does it rain in Sumiswald?
Sumiswald receives on average 1,283 mm of precipitation per year, spread over about 180 rainy days.
Is it sunny in Sumiswald?
Sumiswald gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sumiswald?
The heaviest 24-hour snowfall measured in Sumiswald between 1940 and 2025 was 9 February 1999, with 20.7 cm.
Are there tropical nights in Sumiswald?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Sumiswald.
What was the most extreme apparent temperature in Sumiswald?
In Sumiswald, between 1940 and 2025, the highest apparent temperature reached 36.8 °C on 26 June 2019, and the lowest was -31.8 °C on 19 January 1940.
Compare Sumiswald with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sumiswald