Lyss climate — normals and trends
Lyss (Switzerland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.8 °C and it receives 1,139 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 (18.0 °C on average) and the coldest is January (-0.4 °C). Rainfall peaks in May.
Lyss averages 89 frost days, 3 hot days (≥ 30 °C) and 165 rainy days per year.
Lyss has warmed by +2.6 °C between 1940 and 2025, or +0.30 °C per decade. This trend is statistically significant.
The number of frost days there went from about 115 to 63 per year over the period.
The hottest day of the period reached 36.5 °C (on 7 July 2015) and the coldest -24.7 °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
LyssCanton of Bern
- coords
- 47.07°, 7.31°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.8°C
Average daily high
12.9°C
Average daily low
5.0°C
Annual rainfall
1,139mm
Sunshine / day
8.7h
Mean relative humidity
78%
Average peak wind
10.8km/h
Seasonal range
18.4°C
Frost days (< 0 °C)
89 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
165 d/yr
Annual snowfall
105.4 cm
Average feels-like high
11.1 °C
Average feels-like low
3.0 °C
Average peak gust
31.0 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.62 · 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
36.5 °C
7 July 2015
Coldest day
-24.7 °C
19 January 1940
Wettest day
62 mm
27 September 1942
Windiest day
41.6 km/h
26 December 1999
Strongest gust
128.2 km/h
26 December 1999
Hottest feels-like
37.9 °C
30 June 2019
Coldest feels-like
-29.9 °C
10 February 1956
Snowiest day
22.1 cm
4 March 2006
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 | 5.1 °C | +2.5 °C | 122 mm | +38 mm |
| Feb | 6.2 °C | +1.5 °C | 44 mm | -34 mm |
| Mar | 11.2 °C | +2.2 °C | 45 mm | -38 mm |
| Apr | 15.7 °C | +2.8 °C | 79 mm | -15 mm |
| May | 17.7 °C | +0.7 °C | 136 mm | +22 mm |
| Jun | 25.6 °C | +5.1 °C | 107 mm | -4 mm |
| Jul | 23.0 °C | +0.3 °C | 161 mm | +51 mm |
| Aug | 24.9 °C | +2.7 °C | 160 mm | +49 mm |
| Sep | 18.4 °C | -0.2 °C | 141 mm | +52 mm |
| Oct | 12.8 °C | -0.7 °C | 117 mm | +35 mm |
| Nov | 8.2 °C | +1.0 °C | 121 mm | +26 mm |
| Dec | 5.2 °C | +1.7 °C | 22 mm | -67 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 Lyss?
Lyss has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.8 °C and it receives 1,139 mm of precipitation per year.
What is the hottest day ever recorded in Lyss?
The hottest day measured in Lyss between 1940 and 2025 was 7 July 2015, reaching 36.5 °C.
What is the coldest day in Lyss?
The coldest day measured in Lyss between 1940 and 2025 was 19 January 1940, at -24.7 °C.
Does it snow in Lyss?
Yes. Lyss gets on average 105.4 cm of snow per year and has around 89 frost days.
Has the climate of Lyss warmed?
Yes: Lyss warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Lyss?
The wettest day measured in Lyss between 1940 and 2025 was 27 September 1942, with 62 mm of rain in 24 hours.
What was the windiest day in Lyss?
The windiest day measured in Lyss between 1940 and 2025 was 26 December 1999, with winds reaching 41.6 km/h.
What is the warmest month in Lyss?
The warmest month in Lyss is July (18.0 °C on average); the coldest is January (-0.4 °C).
How much does it rain in Lyss?
Lyss receives on average 1,139 mm of precipitation per year, spread over about 165 rainy days.
Is it sunny in Lyss?
Lyss 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 Lyss?
The heaviest 24-hour snowfall measured in Lyss between 1940 and 2025 was 4 March 2006, with 22.1 cm.
Are there tropical nights in Lyss?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Lyss.
What was the most extreme apparent temperature in Lyss?
In Lyss, between 1940 and 2025, the highest apparent temperature reached 37.9 °C on 30 June 2019, and the lowest was -29.9 °C on 10 February 1956.
Compare Lyss with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Lyss