Sieradz climate — normals and trends
Sieradz (Poland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.7 °C and it receives 644 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 (-2.0 °C). Rainfall peaks in July.
Sieradz averages 95 frost days, 7 hot days (≥ 30 °C) and 130 rainy days per year.
Sieradz 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 114 to 76 per year over the period.
The hottest day of the period reached 38.0 °C (on 22 August 1943) and the coldest -30.3 °C (on 14 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
SieradzŁódź Voivodeship
- coords
- 51.60°, 18.73°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.7°C
Average daily high
12.5°C
Average daily low
4.8°C
Annual rainfall
644mm
Sunshine / day
7.3h
Mean relative humidity
77%
Average peak wind
19.2km/h
Seasonal range
20.9°C
Frost days (< 0 °C)
95 d/yr
Hot days (≥ 30 °C)
7 d/yr
Rainy days (≥ 1 mm)
130 d/yr
Annual snowfall
56.4 cm
Average feels-like high
9.6 °C
Average feels-like low
1.6 °C
Average peak gust
36.2 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
10.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.47 · 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
38.0 °C
22 August 1943
Coldest day
-30.3 °C
14 January 1987
Wettest day
73 mm
6 July 1997
Windiest day
55.0 km/h
19 January 2007
Strongest gust
116.6 km/h
20 January 1986
Hottest feels-like
37.9 °C
29 July 2005
Coldest feels-like
-35.2 °C
14 January 1987
Snowiest day
12.8 cm
19 December 1981
Sunniest day
16.0 h
24 June 2008
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 | 5.1 °C | +4.8 °C | 48 mm | +7 mm |
| Feb | 3.5 °C | +1.5 °C | 12 mm | -27 mm |
| Mar | 12.0 °C | +5.4 °C | 31 mm | -10 mm |
| Apr | 17.1 °C | +4.0 °C | 23 mm | -22 mm |
| May | 16.6 °C | -1.8 °C | 52 mm | -13 mm |
| Jun | 23.7 °C | +1.8 °C | 65 mm | -6 mm |
| Jul | 24.1 °C | +0.5 °C | 145 mm | +59 mm |
| Aug | 24.5 °C | +1.1 °C | 37 mm | -30 mm |
| Sep | 20.4 °C | +1.5 °C | 89 mm | +38 mm |
| Oct | 12.1 °C | -0.9 °C | 72 mm | +29 mm |
| Nov | 6.9 °C | +0.5 °C | 65 mm | +18 mm |
| Dec | 4.2 °C | +2.0 °C | 16 mm | -30 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 Sieradz?
Sieradz has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.7 °C and it receives 644 mm of precipitation per year.
What is the hottest day ever recorded in Sieradz?
The hottest day measured in Sieradz between 1940 and 2025 was 22 August 1943, reaching 38.0 °C.
What is the coldest day in Sieradz?
The coldest day measured in Sieradz between 1940 and 2025 was 14 January 1987, at -30.3 °C.
Does it snow in Sieradz?
Yes. Sieradz gets on average 56.4 cm of snow per year and has around 95 frost days.
Has the climate of Sieradz warmed?
Yes: Sieradz warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sieradz?
The wettest day measured in Sieradz between 1940 and 2025 was 6 July 1997, with 73 mm of rain in 24 hours.
What was the windiest day in Sieradz?
The windiest day measured in Sieradz between 1940 and 2025 was 19 January 2007, with winds reaching 55.0 km/h.
What is the warmest month in Sieradz?
The warmest month in Sieradz is July (18.9 °C on average); the coldest is January (-2.0 °C).
How much does it rain in Sieradz?
Sieradz receives on average 644 mm of precipitation per year, spread over about 130 rainy days.
Is it sunny in Sieradz?
Sieradz 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 Sieradz?
The heaviest 24-hour snowfall measured in Sieradz between 1940 and 2025 was 19 December 1981, with 12.8 cm.
Are there tropical nights in Sieradz?
Yes: Sieradz has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sieradz?
In Sieradz, between 1940 and 2025, the highest apparent temperature reached 37.9 °C on 29 July 2005, and the lowest was -35.2 °C on 14 January 1987.
Compare Sieradz with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sieradz