Chełmża climate — normals and trends
Chełmża (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 601 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 (18.1 °C on average) and the coldest is January (-2.2 °C). Rainfall peaks in July.
Chełmża averages 97 frost days, 2 hot days (≥ 30 °C) and 125 rainy days per year.
Chełmża has warmed by +2.3 °C between 1940 and 2025, or +0.27 °C per decade. This trend is statistically significant.
The number of frost days there went from about 116 to 78 per year over the period.
The hottest day of the period reached 36.8 °C (on 22 August 1943) and the coldest -31.3 °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
ChełmżaKujawsko-Pomorskie
- coords
- 53.18°, 18.60°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.1°C
Average daily high
11.6°C
Average daily low
4.6°C
Annual rainfall
601mm
Sunshine / day
7.3h
Mean relative humidity
80%
Average peak wind
19.1km/h
Seasonal range
20.3°C
Frost days (< 0 °C)
97 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
125 d/yr
Annual snowfall
50.4 cm
Average feels-like high
8.8 °C
Average feels-like low
1.4 °C
Average peak gust
36.1 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.3 °C
since 1940
+0.3 °C per decade · r² = 0.41 · 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
36.8 °C
22 August 1943
Coldest day
-31.3 °C
30 January 1987
Wettest day
76 mm
16 June 1980
Windiest day
56.9 km/h
17 January 1955
Strongest gust
107.6 km/h
11 April 1997
Hottest feels-like
38.4 °C
11 July 1959
Coldest feels-like
-36.5 °C
30 January 1987
Snowiest day
19.6 cm
4 April 1970
Sunniest day
16.0 h
25 June 2023
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 | 4.1 °C | +4.2 °C | 58 mm | +21 mm |
| Feb | 2.7 °C | +1.4 °C | 12 mm | -22 mm |
| Mar | 11.0 °C | +5.3 °C | 22 mm | -14 mm |
| Apr | 16.0 °C | +4.0 °C | 15 mm | -26 mm |
| May | 15.6 °C | -1.7 °C | 61 mm | +0 mm |
| Jun | 21.8 °C | +1.1 °C | 51 mm | -15 mm |
| Jul | 22.7 °C | +0.3 °C | 186 mm | +101 mm |
| Aug | 22.3 °C | 0.0 °C | 57 mm | -9 mm |
| Sep | 19.7 °C | +1.8 °C | 56 mm | +8 mm |
| Oct | 11.9 °C | -0.3 °C | 73 mm | +31 mm |
| Nov | 6.0 °C | +0.3 °C | 40 mm | -3 mm |
| Dec | 4.1 °C | +2.2 °C | 15 mm | -27 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 Chełmża?
Chełmża has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.1 °C and it receives 601 mm of precipitation per year.
What is the hottest day ever recorded in Chełmża?
The hottest day measured in Chełmża between 1940 and 2025 was 22 August 1943, reaching 36.8 °C.
What is the coldest day in Chełmża?
The coldest day measured in Chełmża between 1940 and 2025 was 30 January 1987, at -31.3 °C.
Does it snow in Chełmża?
Yes. Chełmża gets on average 50.4 cm of snow per year and has around 97 frost days.
Has the climate of Chełmża warmed?
Yes: Chełmża warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Chełmża?
The wettest day measured in Chełmża between 1940 and 2025 was 16 June 1980, with 76 mm of rain in 24 hours.
What was the windiest day in Chełmża?
The windiest day measured in Chełmża between 1940 and 2025 was 17 January 1955, with winds reaching 56.9 km/h.
What is the warmest month in Chełmża?
The warmest month in Chełmża is July (18.1 °C on average); the coldest is January (-2.2 °C).
How much does it rain in Chełmża?
Chełmża receives on average 601 mm of precipitation per year, spread over about 125 rainy days.
Is it sunny in Chełmża?
Chełmża 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 Chełmża?
The heaviest 24-hour snowfall measured in Chełmża between 1940 and 2025 was 4 April 1970, with 19.6 cm.
Are there tropical nights in Chełmża?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Chełmża.
What was the most extreme apparent temperature in Chełmża?
In Chełmża, between 1940 and 2025, the highest apparent temperature reached 38.4 °C on 11 July 1959, and the lowest was -36.5 °C on 30 January 1987.
Compare Chełmża with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Chełmża