Olesno climate — normals and trends
Olesno (Poland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.6 °C and it receives 693 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 (18.7 °C on average) and the coldest is January (-2.2 °C). Rainfall peaks in July.
Olesno averages 96 frost days, 6 hot days (≥ 30 °C) and 136 rainy days per year.
Olesno has warmed by +2.7 °C between 1940 and 2025, or +0.31 °C per decade. This trend is statistically significant.
The number of frost days there went from about 115 to 77 per year over the period.
The hottest day of the period reached 37.6 °C (on 8 August 2013) and the coldest -28.0 °C (on 7 February 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
OlesnoOpole Voivodeship
- coords
- 50.88°, 18.42°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.6°C
Average daily high
12.4°C
Average daily low
4.8°C
Annual rainfall
693mm
Sunshine / day
7.5h
Mean relative humidity
77%
Average peak wind
19.1km/h
Seasonal range
20.9°C
Frost days (< 0 °C)
96 d/yr
Hot days (≥ 30 °C)
6 d/yr
Rainy days (≥ 1 mm)
136 d/yr
Annual snowfall
63.6 cm
Average feels-like high
9.6 °C
Average feels-like low
1.6 °C
Average peak gust
36.1 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
10.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.7 °C
since 1940
+0.3 °C per decade · r² = 0.50 · 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
37.6 °C
8 August 2013
Coldest day
-28.0 °C
7 February 1947
Wettest day
90 mm
6 July 1997
Windiest day
52.8 km/h
28 March 1997
Strongest gust
113.4 km/h
7 March 2002
Hottest feels-like
37.5 °C
5 July 1957
Coldest feels-like
-33.6 °C
7 February 1947
Snowiest day
14.0 cm
3 April 1970
Sunniest day
15.9 h
2 July 2025
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 5.0 °C | +4.9 °C | 45 mm | +2 mm |
| Feb | 3.6 °C | +1.7 °C | 12 mm | -30 mm |
| Mar | 11.9 °C | +5.2 °C | 35 mm | -10 mm |
| Apr | 16.8 °C | +3.7 °C | 29 mm | -20 mm |
| May | 16.5 °C | -1.7 °C | 60 mm | -9 mm |
| Jun | 23.9 °C | +2.2 °C | 55 mm | -23 mm |
| Jul | 24.0 °C | +0.6 °C | 144 mm | +50 mm |
| Aug | 24.6 °C | +1.3 °C | 34 mm | -39 mm |
| Sep | 20.3 °C | +1.5 °C | 104 mm | +48 mm |
| Oct | 12.0 °C | -1.1 °C | 76 mm | +30 mm |
| Nov | 6.9 °C | +0.4 °C | 68 mm | +18 mm |
| Dec | 4.2 °C | +2.1 °C | 15 mm | -34 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 Olesno?
Olesno has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.6 °C and it receives 693 mm of precipitation per year.
What is the hottest day ever recorded in Olesno?
The hottest day measured in Olesno between 1940 and 2025 was 8 August 2013, reaching 37.6 °C.
What is the coldest day in Olesno?
The coldest day measured in Olesno between 1940 and 2025 was 7 February 1947, at -28.0 °C.
Does it snow in Olesno?
Yes. Olesno gets on average 63.6 cm of snow per year and has around 96 frost days.
Has the climate of Olesno warmed?
Yes: Olesno warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Olesno?
The wettest day measured in Olesno between 1940 and 2025 was 6 July 1997, with 90 mm of rain in 24 hours.
What was the windiest day in Olesno?
The windiest day measured in Olesno between 1940 and 2025 was 28 March 1997, with winds reaching 52.8 km/h.
What is the warmest month in Olesno?
The warmest month in Olesno is July (18.7 °C on average); the coldest is January (-2.2 °C).
How much does it rain in Olesno?
Olesno receives on average 693 mm of precipitation per year, spread over about 136 rainy days.
Is it sunny in Olesno?
Olesno 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 Olesno?
The heaviest 24-hour snowfall measured in Olesno between 1940 and 2025 was 3 April 1970, with 14.0 cm.
Are there tropical nights in Olesno?
Yes: Olesno has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Olesno?
In Olesno, between 1940 and 2025, the highest apparent temperature reached 37.5 °C on 5 July 1957, and the lowest was -33.6 °C on 7 February 1947.
Compare Olesno with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Olesno