Flen climate — normals and trends
Flen (Sweden) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 6.4 °C and it receives 612 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 (17.2 °C on average) and the coldest is January (-3.2 °C). Rainfall peaks in July.
Flen averages 121 frost days, 0 hot days (≥ 30 °C) and 120 rainy days per year.
Flen has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 135 to 107 per year over the period.
The hottest day of the period reached 33.5 °C (on 7 August 1975) and the coldest -30.0 °C (on 18 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
FlenSödermanland County
- coords
- 59.06°, 16.59°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
6.4°C
Average daily high
9.6°C
Average daily low
3.3°C
Annual rainfall
612mm
Sunshine / day
7.5h
Mean relative humidity
80%
Average peak wind
16.3km/h
Seasonal range
20.4°C
Frost days (< 0 °C)
121 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
120 d/yr
Annual snowfall
85.3 cm
Average feels-like high
6.7 °C
Average feels-like low
0.0 °C
Average peak gust
35.7 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.25 · 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
33.5 °C
7 August 1975
Coldest day
-30.0 °C
18 January 1940
Wettest day
53 mm
1 September 1978
Windiest day
45.6 km/h
30 December 1983
Strongest gust
102.6 km/h
15 January 1989
Hottest feels-like
33.0 °C
10 July 1983
Coldest feels-like
-35.2 °C
18 January 1940
Snowiest day
15.5 cm
6 December 1985
Sunniest day
18.0 h
20 June 1941
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 | 1.8 °C | +2.9 °C | 67 mm | +27 mm |
| Feb | 1.8 °C | +2.3 °C | 13 mm | -18 mm |
| Mar | 7.6 °C | +4.2 °C | 8 mm | -23 mm |
| Apr | 11.9 °C | +3.1 °C | 27 mm | -13 mm |
| May | 14.0 °C | -0.7 °C | 60 mm | +12 mm |
| Jun | 19.1 °C | +0.1 °C | 81 mm | +17 mm |
| Jul | 23.2 °C | +2.3 °C | 128 mm | +49 mm |
| Aug | 19.4 °C | -0.4 °C | 54 mm | -22 mm |
| Sep | 17.9 °C | +2.6 °C | 54 mm | -4 mm |
| Oct | 10.8 °C | +1.0 °C | 65 mm | +14 mm |
| Nov | 5.2 °C | +1.2 °C | 38 mm | -13 mm |
| Dec | 4.6 °C | +3.8 °C | 40 mm | -5 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 Flen?
Flen has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 6.4 °C and it receives 612 mm of precipitation per year.
What is the hottest day ever recorded in Flen?
The hottest day measured in Flen between 1940 and 2025 was 7 August 1975, reaching 33.5 °C.
What is the coldest day in Flen?
The coldest day measured in Flen between 1940 and 2025 was 18 January 1940, at -30.0 °C.
Does it snow in Flen?
Yes. Flen gets on average 85.3 cm of snow per year and has around 121 frost days.
Has the climate of Flen warmed?
Yes: Flen warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Flen?
The wettest day measured in Flen between 1940 and 2025 was 1 September 1978, with 53 mm of rain in 24 hours.
What was the windiest day in Flen?
The windiest day measured in Flen between 1940 and 2025 was 30 December 1983, with winds reaching 45.6 km/h.
What is the warmest month in Flen?
The warmest month in Flen is July (17.2 °C on average); the coldest is January (-3.2 °C).
How much does it rain in Flen?
Flen receives on average 612 mm of precipitation per year, spread over about 120 rainy days.
Is it sunny in Flen?
Flen gets on average 7.5 hours of sunshine per day, roughly 2,738 hours per year over 1940-2025.
What is the biggest single-day snowfall in Flen?
The heaviest 24-hour snowfall measured in Flen between 1940 and 2025 was 6 December 1985, with 15.5 cm.
Are there tropical nights in Flen?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Flen.
What was the most extreme apparent temperature in Flen?
In Flen, between 1940 and 2025, the highest apparent temperature reached 33.0 °C on 10 July 1983, and the lowest was -35.2 °C on 18 January 1940.
Compare Flen with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Flen