Grójec climate — normals and trends
Grójec (Poland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.3 °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 (18.7 °C on average) and the coldest is January (-2.6 °C). Rainfall peaks in July.
Grójec averages 99 frost days, 4 hot days (≥ 30 °C) and 131 rainy days per year.
Grójec has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The number of frost days there went from about 118 to 80 per year over the period.
The hottest day of the period reached 36.2 °C (on 29 August 1992) and the coldest -30.9 °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
GrójecMazovia
- coords
- 51.86°, 20.87°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.3°C
Average daily high
12.0°C
Average daily low
4.7°C
Annual rainfall
644mm
Sunshine / day
7.3h
Mean relative humidity
78%
Average peak wind
17.7km/h
Seasonal range
21.3°C
Frost days (< 0 °C)
99 d/yr
Hot days (≥ 30 °C)
4 d/yr
Rainy days (≥ 1 mm)
131 d/yr
Annual snowfall
61.7 cm
Average feels-like high
9.4 °C
Average feels-like low
1.5 °C
Average peak gust
35.8 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
10.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.44 · 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
36.2 °C
29 August 1992
Coldest day
-30.9 °C
14 January 1987
Wettest day
50 mm
12 August 1949
Windiest day
52.2 km/h
20 January 1986
Strongest gust
115.2 km/h
19 January 2007
Hottest feels-like
36.9 °C
1 August 1994
Coldest feels-like
-35.9 °C
14 January 1987
Snowiest day
19.7 cm
30 January 1979
Sunniest day
15.6 h
7 July 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 | 4.7 °C | +5.0 °C | 42 mm | +3 mm |
| Feb | 2.6 °C | +1.2 °C | 15 mm | -23 mm |
| Mar | 11.8 °C | +5.8 °C | 30 mm | -9 mm |
| Apr | 16.5 °C | +3.8 °C | 23 mm | -26 mm |
| May | 16.1 °C | -2.1 °C | 80 mm | +15 mm |
| Jun | 23.1 °C | +1.5 °C | 53 mm | -20 mm |
| Jul | 24.5 °C | +1.3 °C | 95 mm | +10 mm |
| Aug | 24.8 °C | +1.8 °C | 30 mm | -40 mm |
| Sep | 20.5 °C | +2.2 °C | 66 mm | +13 mm |
| Oct | 12.0 °C | -0.4 °C | 57 mm | +15 mm |
| Nov | 6.7 °C | +0.8 °C | 51 mm | +5 mm |
| Dec | 3.9 °C | +2.2 °C | 18 mm | -25 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 Grójec?
Grójec has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.3 °C and it receives 644 mm of precipitation per year.
What is the hottest day ever recorded in Grójec?
The hottest day measured in Grójec between 1940 and 2025 was 29 August 1992, reaching 36.2 °C.
What is the coldest day in Grójec?
The coldest day measured in Grójec between 1940 and 2025 was 14 January 1987, at -30.9 °C.
Does it snow in Grójec?
Yes. Grójec gets on average 61.7 cm of snow per year and has around 99 frost days.
Has the climate of Grójec warmed?
Yes: Grójec warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Grójec?
The wettest day measured in Grójec between 1940 and 2025 was 12 August 1949, with 50 mm of rain in 24 hours.
What was the windiest day in Grójec?
The windiest day measured in Grójec between 1940 and 2025 was 20 January 1986, with winds reaching 52.2 km/h.
What is the warmest month in Grójec?
The warmest month in Grójec is July (18.7 °C on average); the coldest is January (-2.6 °C).
How much does it rain in Grójec?
Grójec receives on average 644 mm of precipitation per year, spread over about 131 rainy days.
Is it sunny in Grójec?
Grójec 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 Grójec?
The heaviest 24-hour snowfall measured in Grójec between 1940 and 2025 was 30 January 1979, with 19.7 cm.
Are there tropical nights in Grójec?
Yes: Grójec has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Grójec?
In Grójec, between 1940 and 2025, the highest apparent temperature reached 36.9 °C on 1 August 1994, and the lowest was -35.9 °C on 14 January 1987.
Compare Grójec with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Grójec