Chełm climate — normals and trends
Chełm (Poland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.0 °C and it receives 658 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 (-3.5 °C). Rainfall peaks in July.
Chełm averages 108 frost days, 5 hot days (≥ 30 °C) and 131 rainy days per year.
Chełm 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 126 to 90 per year over the period.
The hottest day of the period reached 38.2 °C (on 1 July 2019) and the coldest -34.7 °C (on 11 January 1940).
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
ChełmLublin
- coords
- 51.14°, 23.47°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.0°C
Average daily high
11.8°C
Average daily low
4.2°C
Annual rainfall
658mm
Sunshine / day
7.4h
Mean relative humidity
78%
Average peak wind
18.2km/h
Seasonal range
22.4°C
Frost days (< 0 °C)
108 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
131 d/yr
Annual snowfall
70.9 cm
Average feels-like high
9.0 °C
Average feels-like low
1.0 °C
Average peak gust
35.3 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.8 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
1 July 2019
Coldest day
-34.7 °C
11 January 1940
Wettest day
73 mm
6 August 2006
Windiest day
53.9 km/h
3 November 1981
Strongest gust
110.2 km/h
6 September 1992
Hottest feels-like
36.9 °C
11 July 2002
Coldest feels-like
-40.0 °C
11 January 1940
Snowiest day
16.2 cm
24 January 2007
Sunniest day
15.3 h
17 June 2021
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 | 4.8 °C | +6.0 °C | 36 mm | -2 mm |
| Feb | 1.6 °C | +1.2 °C | 14 mm | -23 mm |
| Mar | 11.8 °C | +6.4 °C | 50 mm | +10 mm |
| Apr | 16.0 °C | +3.3 °C | 39 mm | -12 mm |
| May | 15.9 °C | -2.5 °C | 68 mm | -2 mm |
| Jun | 23.2 °C | +1.4 °C | 73 mm | -8 mm |
| Jul | 24.5 °C | +0.9 °C | 162 mm | +78 mm |
| Aug | 24.5 °C | +1.3 °C | 16 mm | -56 mm |
| Sep | 21.1 °C | +2.8 °C | 62 mm | +3 mm |
| Oct | 11.8 °C | -0.4 °C | 45 mm | +0 mm |
| Nov | 7.1 °C | +1.6 °C | 55 mm | +12 mm |
| Dec | 3.9 °C | +2.9 °C | 18 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 Chełm?
Chełm has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.0 °C and it receives 658 mm of precipitation per year.
What is the hottest day ever recorded in Chełm?
The hottest day measured in Chełm between 1940 and 2025 was 1 July 2019, reaching 38.2 °C.
What is the coldest day in Chełm?
The coldest day measured in Chełm between 1940 and 2025 was 11 January 1940, at -34.7 °C.
Does it snow in Chełm?
Yes. Chełm gets on average 70.9 cm of snow per year and has around 108 frost days.
Has the climate of Chełm warmed?
Yes: Chełm warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Chełm?
The wettest day measured in Chełm between 1940 and 2025 was 6 August 2006, with 73 mm of rain in 24 hours.
What was the windiest day in Chełm?
The windiest day measured in Chełm between 1940 and 2025 was 3 November 1981, with winds reaching 53.9 km/h.
What is the warmest month in Chełm?
The warmest month in Chełm is July (18.9 °C on average); the coldest is January (-3.5 °C).
How much does it rain in Chełm?
Chełm receives on average 658 mm of precipitation per year, spread over about 131 rainy days.
Is it sunny in Chełm?
Chełm 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 Chełm?
The heaviest 24-hour snowfall measured in Chełm between 1940 and 2025 was 24 January 2007, with 16.2 cm.
Are there tropical nights in Chełm?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Chełm.
What was the most extreme apparent temperature in Chełm?
In Chełm, between 1940 and 2025, the highest apparent temperature reached 36.9 °C on 11 July 2002, and the lowest was -40.0 °C on 11 January 1940.
Compare Chełm with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Chełm