Sulejówek climate — normals and trends
Sulejówek (Poland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.3 °C and it receives 641 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 (18.9 °C on average) and the coldest is January (-2.7 °C). Rainfall peaks in July.
Sulejówek averages 100 frost days, 6 hot days (≥ 30 °C) and 132 rainy days per year.
Sulejówek has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The number of frost days there went from about 119 to 81 per year over the period.
The hottest day of the period reached 36.2 °C (on 8 August 2013) and the coldest -31.4 °C (on 30 January 1987).
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
SulejówekMazovia
- coords
- 52.25°, 21.27°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.3°C
Average daily high
12.0°C
Average daily low
4.6°C
Annual rainfall
641mm
Sunshine / day
7.3h
Mean relative humidity
78%
Average peak wind
17.3km/h
Seasonal range
21.6°C
Frost days (< 0 °C)
100 d/yr
Hot days (≥ 30 °C)
6 d/yr
Rainy days (≥ 1 mm)
132 d/yr
Annual snowfall
62.2 cm
Average feels-like high
9.3 °C
Average feels-like low
1.6 °C
Average peak gust
35.3 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
10.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.43 · 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
36.2 °C
8 August 2013
Coldest day
-31.4 °C
30 January 1987
Wettest day
65 mm
6 August 2006
Windiest day
50.3 km/h
3 November 1981
Strongest gust
110.2 km/h
24 November 1984
Hottest feels-like
37.3 °C
14 July 2021
Coldest feels-like
-36.3 °C
30 January 1987
Snowiest day
23.8 cm
30 January 1979
Sunniest day
15.8 h
20 June 2025
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 | 4.4 °C | +4.9 °C | 44 mm | +3 mm |
| Feb | 2.3 °C | +1.2 °C | 13 mm | -27 mm |
| Mar | 11.8 °C | +6.0 °C | 30 mm | -9 mm |
| Apr | 16.9 °C | +4.2 °C | 27 mm | -21 mm |
| May | 16.2 °C | -2.2 °C | 71 mm | +8 mm |
| Jun | 23.1 °C | +1.2 °C | 54 mm | -18 mm |
| Jul | 24.7 °C | +1.2 °C | 97 mm | +15 mm |
| Aug | 24.9 °C | +1.8 °C | 30 mm | -38 mm |
| Sep | 20.5 °C | +2.2 °C | 65 mm | +12 mm |
| Oct | 12.0 °C | -0.2 °C | 54 mm | +11 mm |
| Nov | 6.5 °C | +0.9 °C | 47 mm | -1 mm |
| Dec | 3.9 °C | +2.4 °C | 19 mm | -28 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 Sulejówek?
Sulejówek has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.3 °C and it receives 641 mm of precipitation per year.
What is the hottest day ever recorded in Sulejówek?
The hottest day measured in Sulejówek between 1940 and 2025 was 8 August 2013, reaching 36.2 °C.
What is the coldest day in Sulejówek?
The coldest day measured in Sulejówek between 1940 and 2025 was 30 January 1987, at -31.4 °C.
Does it snow in Sulejówek?
Yes. Sulejówek gets on average 62.2 cm of snow per year and has around 100 frost days.
Has the climate of Sulejówek warmed?
Yes: Sulejówek warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sulejówek?
The wettest day measured in Sulejówek between 1940 and 2025 was 6 August 2006, with 65 mm of rain in 24 hours.
What was the windiest day in Sulejówek?
The windiest day measured in Sulejówek between 1940 and 2025 was 3 November 1981, with winds reaching 50.3 km/h.
What is the warmest month in Sulejówek?
The warmest month in Sulejówek is July (18.9 °C on average); the coldest is January (-2.7 °C).
How much does it rain in Sulejówek?
Sulejówek receives on average 641 mm of precipitation per year, spread over about 132 rainy days.
Is it sunny in Sulejówek?
Sulejówek gets on average 7.3 hours of sunshine per day, roughly 2,665 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sulejówek?
The heaviest 24-hour snowfall measured in Sulejówek between 1940 and 2025 was 30 January 1979, with 23.8 cm.
Are there tropical nights in Sulejówek?
Yes: Sulejówek has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sulejówek?
In Sulejówek, between 1940 and 2025, the highest apparent temperature reached 37.3 °C on 14 July 2021, and the lowest was -36.3 °C on 30 January 1987.
Compare Sulejówek with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sulejówek