Siewierz climate — normals and trends
Siewierz (Poland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.1 °C and it receives 768 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 (18.2 °C on average) and the coldest is January (-2.8 °C). Rainfall peaks in July.
Siewierz averages 102 frost days, 4 hot days (≥ 30 °C) and 146 rainy days per year.
Siewierz 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 122 to 82 per year over the period.
The hottest day of the period reached 36.0 °C (on 8 August 2013) and the coldest -28.4 °C (on 3 February 2012).
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
SiewierzSilesia
- coords
- 50.47°, 19.23°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.1°C
Average daily high
11.8°C
Average daily low
4.5°C
Annual rainfall
768mm
Sunshine / day
7.5h
Mean relative humidity
79%
Average peak wind
19.4km/h
Seasonal range
21.0°C
Frost days (< 0 °C)
102 d/yr
Hot days (≥ 30 °C)
4 d/yr
Rainy days (≥ 1 mm)
146 d/yr
Annual snowfall
82.0 cm
Average feels-like high
9.1 °C
Average feels-like low
1.3 °C
Average peak gust
36.4 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 = 0.51 · 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
36.0 °C
8 August 2013
Coldest day
-28.4 °C
3 February 2012
Wettest day
56 mm
8 July 1997
Windiest day
54.0 km/h
5 March 1940
Strongest gust
109.4 km/h
19 January 2007
Hottest feels-like
38.2 °C
8 July 1957
Coldest feels-like
-34.4 °C
3 February 2012
Snowiest day
18.3 cm
3 April 1970
Sunniest day
15.7 h
30 June 2019
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 | 4.3 °C | +4.9 °C | 53 mm | +6 mm |
| Feb | 3.2 °C | +1.9 °C | 20 mm | -25 mm |
| Mar | 11.6 °C | +5.4 °C | 53 mm | +5 mm |
| Apr | 16.1 °C | +3.4 °C | 36 mm | -21 mm |
| May | 15.7 °C | -2.0 °C | 71 mm | -8 mm |
| Jun | 23.3 °C | +2.4 °C | 59 mm | -31 mm |
| Jul | 23.6 °C | +0.9 °C | 135 mm | +33 mm |
| Aug | 24.6 °C | +2.0 °C | 33 mm | -51 mm |
| Sep | 19.9 °C | +1.7 °C | 97 mm | +35 mm |
| Oct | 11.9 °C | -0.8 °C | 81 mm | +32 mm |
| Nov | 6.8 °C | +0.7 °C | 71 mm | +18 mm |
| Dec | 3.6 °C | +2.1 °C | 11 mm | -40 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 Siewierz?
Siewierz has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.1 °C and it receives 768 mm of precipitation per year.
What is the hottest day ever recorded in Siewierz?
The hottest day measured in Siewierz between 1940 and 2025 was 8 August 2013, reaching 36.0 °C.
What is the coldest day in Siewierz?
The coldest day measured in Siewierz between 1940 and 2025 was 3 February 2012, at -28.4 °C.
Does it snow in Siewierz?
Yes. Siewierz gets on average 82.0 cm of snow per year and has around 102 frost days.
Has the climate of Siewierz warmed?
Yes: Siewierz warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Siewierz?
The wettest day measured in Siewierz between 1940 and 2025 was 8 July 1997, with 56 mm of rain in 24 hours.
What was the windiest day in Siewierz?
The windiest day measured in Siewierz between 1940 and 2025 was 5 March 1940, with winds reaching 54.0 km/h.
What is the warmest month in Siewierz?
The warmest month in Siewierz is July (18.2 °C on average); the coldest is January (-2.8 °C).
How much does it rain in Siewierz?
Siewierz receives on average 768 mm of precipitation per year, spread over about 146 rainy days.
Is it sunny in Siewierz?
Siewierz 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 Siewierz?
The heaviest 24-hour snowfall measured in Siewierz between 1940 and 2025 was 3 April 1970, with 18.3 cm.
Are there tropical nights in Siewierz?
Yes: Siewierz has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Siewierz?
In Siewierz, between 1940 and 2025, the highest apparent temperature reached 38.2 °C on 8 July 1957, and the lowest was -34.4 °C on 3 February 2012.
Compare Siewierz with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Siewierz