Slonim climate — normals and trends
Slonim has a warm-summer humid continental climate, averaging 6.9 °C annually with 667 mm of rain per year.
Climate normals · ERA5
SlonimGrodnenskaya
- coords
- 53.09°, 25.32°
- period
- 1940–2025 · 86 yrs
The normals for this period
The average of every indicator across the whole window: temperature, water, sky, wind and notable days.
Mean daily temperature
6.9°C
Average daily high
10.6°C
Average daily low
3.2°C
Annual rainfall
667mm
Sunshine / day
7.0h
Mean relative humidity
80%
Average peak wind
20.0km/h
Seasonal range
23.2°C
Frost days (< 0 °C)
125 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
133 d/yr
Annual snowfall
84.1 cm
Average feels-like high
7.5 °C
Average feels-like low
-0.3 °C
Average peak gust
36.8 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.4 MJ/m²
Has the climate changed?
What the yearly averages say about warming here, and whether the slope is statistically solid.
+2.8 °C
since 1940
+0.3 °C per decade · r² = 0.49 · 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).
Climate month by month
How an average year unfolds: when it rains, when it turns hot, when the sun is out.
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
The most extreme days ever measured here, then the year-by-year detail.
Hottest day
35.2 °C
8 July 2012
Coldest day
-35.1 °C
11 January 1950
Wettest day
75 mm
28 June 2023
Windiest day
73.6 km/h
22 February 1953
Strongest gust
107.6 km/h
22 February 1953
Hottest feels-like
37.2 °C
17 July 2007
Coldest feels-like
-40.4 °C
11 January 1950
Snowiest day
17.4 cm
8 October 2002
Sunniest day
16.2 h
20 June 2018
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and compare it with the normal: warmer, drier, more extreme?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 3.4 °C | +6.1 °C | 41 mm | +1 mm |
| Feb | -0.2 °C | +1.2 °C | 15 mm | -21 mm |
| Mar | 11.0 °C | +7.3 °C | 31 mm | -7 mm |
| Apr | 15.5 °C | +3.8 °C | 25 mm | -24 mm |
| May | 15.0 °C | -2.7 °C | 90 mm | +18 mm |
| Jun | 21.5 °C | +0.4 °C | 92 mm | +14 mm |
| Jul | 23.8 °C | +1.0 °C | 163 mm | +76 mm |
| Aug | 22.9 °C | +0.6 °C | 37 mm | -34 mm |
| Sep | 20.2 °C | +2.9 °C | 55 mm | -2 mm |
| Oct | 10.7 °C | 0.0 °C | 70 mm | +21 mm |
| Nov | 5.8 °C | +1.8 °C | 52 mm | +5 mm |
| Dec | 2.9 °C | +3.2 °C | 31 mm | -14 mm |
The year's extremes
What was the weather like that day?
The weather actually measured on a given date, anywhere in the covered window.
Climate at a glance
What these normals say about the place, in a few sentences, and the notions needed to read them.
Slonim (Belarus) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 6.9 °C and it receives 667 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 (-5.0 °C). Rainfall peaks in July.
Slonim averages 125 frost days, 3 hot days (≥ 30 °C) and 133 rainy days per year.
Slonim has warmed by +2.8 °C between 1940 and 2025, or +0.33 °C per decade. This trend is statistically significant.
The number of frost days there went from about 145 to 105 per year over the period.
The hottest day of the period reached 35.2 °C (on 8 July 2012) and the coldest -35.1 °C (on 11 January 1950).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Compare Slonim with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Slonim
Other cities — Belarus
Frequently asked questions
What is the climate of Slonim?
Slonim has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 6.9 °C and it receives 667 mm of precipitation per year.
What is the hottest day ever recorded in Slonim?
The hottest day measured in Slonim between 1940 and 2025 was 8 July 2012, reaching 35.2 °C.
What is the coldest day in Slonim?
The coldest day measured in Slonim between 1940 and 2025 was 11 January 1950, at -35.1 °C.
Does it snow in Slonim?
Yes. Slonim gets on average 84.1 cm of snow per year and has around 125 frost days.
Has the climate of Slonim warmed?
Yes: Slonim warmed by +2.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Slonim?
The wettest day measured in Slonim between 1940 and 2025 was 28 June 2023, with 75 mm of rain in 24 hours.
What was the windiest day in Slonim?
The windiest day measured in Slonim between 1940 and 2025 was 22 February 1953, with winds reaching 73.6 km/h.
What is the warmest month in Slonim?
The warmest month in Slonim is July (18.2 °C on average); the coldest is January (-5.0 °C).
How much does it rain in Slonim?
Slonim receives on average 667 mm of precipitation per year, spread over about 133 rainy days.
Is it sunny in Slonim?
Slonim gets on average 7.0 hours of sunshine per day, roughly 2,555 hours per year over 1940-2025.
What is the biggest single-day snowfall in Slonim?
The heaviest 24-hour snowfall measured in Slonim between 1940 and 2025 was 8 October 2002, with 17.4 cm.
Are there tropical nights in Slonim?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Slonim.
What was the most extreme apparent temperature in Slonim?
In Slonim, between 1940 and 2025, the highest apparent temperature reached 37.2 °C on 17 July 2007, and the lowest was -40.4 °C on 11 January 1950.
These forecasts and records come from our own weather API. Developer documentation →