Kościan climate — normals and trends
Kościan (Poland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.0 °C and it receives 598 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 (-1.2 °C). Rainfall peaks in July.
Kościan averages 87 frost days, 6 hot days (≥ 30 °C) and 125 rainy days per year.
Kościan has warmed by +2.5 °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 104 to 70 per year over the period.
The hottest day of the period reached 38.2 °C (on 8 August 2015) and the coldest -31.2 °C (on 13 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
KościanGreater Poland
- coords
- 52.09°, 16.65°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.0°C
Average daily high
12.6°C
Average daily low
5.3°C
Annual rainfall
598mm
Sunshine / day
7.4h
Mean relative humidity
77%
Average peak wind
18.5km/h
Seasonal range
20.1°C
Frost days (< 0 °C)
87 d/yr
Hot days (≥ 30 °C)
6 d/yr
Rainy days (≥ 1 mm)
125 d/yr
Annual snowfall
43.0 cm
Average feels-like high
9.9 °C
Average feels-like low
2.3 °C
Average peak gust
35.8 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
10.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.46 · 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
38.2 °C
8 August 2015
Coldest day
-31.2 °C
13 January 1987
Wettest day
73 mm
21 July 2011
Windiest day
55.0 km/h
28 March 1997
Strongest gust
118.8 km/h
20 January 1986
Hottest feels-like
38.4 °C
8 August 2015
Coldest feels-like
-36.2 °C
14 January 1987
Snowiest day
13.6 cm
18 March 1960
Sunniest day
16.0 h
4 July 1942
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 | 5.0 °C | +4.0 °C | 56 mm | +16 mm |
| Feb | 3.4 °C | +0.9 °C | 21 mm | -16 mm |
| Mar | 11.9 °C | +4.9 °C | 27 mm | -13 mm |
| Apr | 17.0 °C | +4.0 °C | 22 mm | -19 mm |
| May | 17.1 °C | -1.0 °C | 68 mm | +10 mm |
| Jun | 24.1 °C | +2.4 °C | 61 mm | -1 mm |
| Jul | 24.5 °C | +1.0 °C | 81 mm | +3 mm |
| Aug | 24.5 °C | +1.2 °C | 72 mm | +6 mm |
| Sep | 20.6 °C | +1.7 °C | 63 mm | +16 mm |
| Oct | 12.4 °C | -0.7 °C | 64 mm | +23 mm |
| Nov | 7.1 °C | +0.5 °C | 40 mm | -3 mm |
| Dec | 4.2 °C | +1.5 °C | 22 mm | -23 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 Kościan?
Kościan has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 9.0 °C and it receives 598 mm of precipitation per year.
What is the hottest day ever recorded in Kościan?
The hottest day measured in Kościan between 1940 and 2025 was 8 August 2015, reaching 38.2 °C.
What is the coldest day in Kościan?
The coldest day measured in Kościan between 1940 and 2025 was 13 January 1987, at -31.2 °C.
Does it snow in Kościan?
Yes. Kościan gets on average 43.0 cm of snow per year and has around 87 frost days.
Has the climate of Kościan warmed?
Yes: Kościan warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Kościan?
The wettest day measured in Kościan between 1940 and 2025 was 21 July 2011, with 73 mm of rain in 24 hours.
What was the windiest day in Kościan?
The windiest day measured in Kościan between 1940 and 2025 was 28 March 1997, with winds reaching 55.0 km/h.
What is the warmest month in Kościan?
The warmest month in Kościan is July (18.9 °C on average); the coldest is January (-1.2 °C).
How much does it rain in Kościan?
Kościan receives on average 598 mm of precipitation per year, spread over about 125 rainy days.
Is it sunny in Kościan?
Kościan gets on average 7.4 hours of sunshine per day, roughly 2,701 hours per year over 1940-2025.
What is the biggest single-day snowfall in Kościan?
The heaviest 24-hour snowfall measured in Kościan between 1940 and 2025 was 18 March 1960, with 13.6 cm.
Are there tropical nights in Kościan?
Yes: Kościan has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Kościan?
In Kościan, between 1940 and 2025, the highest apparent temperature reached 38.4 °C on 8 August 2015, and the lowest was -36.2 °C on 14 January 1987.
Compare Kościan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Kościan