Flawil climate — normals and trends
Flawil (Switzerland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.6 °C and it receives 1,461 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 (18.1 °C on average) and the coldest is January (-1.2 °C). Rainfall peaks in July.
Flawil averages 89 frost days, 2 hot days (≥ 30 °C) and 179 rainy days per year.
Flawil 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 120 to 58 per year over the period.
The hottest day of the period reached 33.8 °C (on 7 July 2015) and the coldest -24.4 °C (on 6 January 1947).
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
FlawilCanton of St. Gallen
- coords
- 47.41°, 9.18°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.6°C
Average daily high
12.1°C
Average daily low
5.5°C
Annual rainfall
1,461mm
Sunshine / day
8.4h
Mean relative humidity
80%
Average peak wind
10.5km/h
Seasonal range
19.3°C
Frost days (< 0 °C)
89 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
179 d/yr
Annual snowfall
148.8 cm
Average feels-like high
10.6 °C
Average feels-like low
3.5 °C
Average peak gust
27.8 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
12.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.7 °C
since 1940
+0.3 °C per decade · r² = 0.63 · 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
33.8 °C
7 July 2015
Coldest day
-24.4 °C
6 January 1947
Wettest day
82 mm
11 July 1956
Windiest day
40.7 km/h
26 December 1999
Strongest gust
126.0 km/h
26 December 1999
Hottest feels-like
39.6 °C
6 July 1957
Coldest feels-like
-30.2 °C
10 February 1956
Snowiest day
24.7 cm
14 January 2021
Sunniest day
15.0 h
26 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 | 4.1 °C | +2.6 °C | 95 mm | +6 mm |
| Feb | 5.1 °C | +1.6 °C | 36 mm | -50 mm |
| Mar | 10.5 °C | +2.7 °C | 74 mm | -19 mm |
| Apr | 15.5 °C | +3.3 °C | 59 mm | -53 mm |
| May | 17.4 °C | +0.7 °C | 160 mm | +10 mm |
| Jun | 25.1 °C | +5.1 °C | 107 mm | -64 mm |
| Jul | 22.2 °C | +0.2 °C | 243 mm | +67 mm |
| Aug | 23.7 °C | +2.2 °C | 209 mm | +39 mm |
| Sep | 18.3 °C | +0.3 °C | 175 mm | +53 mm |
| Oct | 12.7 °C | -0.2 °C | 90 mm | -4 mm |
| Nov | 7.4 °C | +0.8 °C | 108 mm | +6 mm |
| Dec | 3.8 °C | +1.3 °C | 29 mm | -68 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 Flawil?
Flawil has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.6 °C and it receives 1,461 mm of precipitation per year.
What is the hottest day ever recorded in Flawil?
The hottest day measured in Flawil between 1940 and 2025 was 7 July 2015, reaching 33.8 °C.
What is the coldest day in Flawil?
The coldest day measured in Flawil between 1940 and 2025 was 6 January 1947, at -24.4 °C.
Does it snow in Flawil?
Yes. Flawil gets on average 148.8 cm of snow per year and has around 89 frost days.
Has the climate of Flawil warmed?
Yes: Flawil warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Flawil?
The wettest day measured in Flawil between 1940 and 2025 was 11 July 1956, with 82 mm of rain in 24 hours.
What was the windiest day in Flawil?
The windiest day measured in Flawil between 1940 and 2025 was 26 December 1999, with winds reaching 40.7 km/h.
What is the warmest month in Flawil?
The warmest month in Flawil is July (18.1 °C on average); the coldest is January (-1.2 °C).
How much does it rain in Flawil?
Flawil receives on average 1,461 mm of precipitation per year, spread over about 179 rainy days.
Is it sunny in Flawil?
Flawil gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Flawil?
The heaviest 24-hour snowfall measured in Flawil between 1940 and 2025 was 14 January 2021, with 24.7 cm.
Are there tropical nights in Flawil?
Yes: Flawil has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Flawil?
In Flawil, between 1940 and 2025, the highest apparent temperature reached 39.6 °C on 6 July 1957, and the lowest was -30.2 °C on 10 February 1956.
Compare Flawil with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Flawil