Slaný climate — normals and trends
Slaný (Czechia) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.7 °C and it receives 581 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 (18.6 °C on average) and the coldest is January (-1.3 °C). Rainfall peaks in July.
Slaný averages 93 frost days, 7 hot days (≥ 30 °C) and 121 rainy days per year.
Slaný has warmed by +2.7 °C between 1940 and 2025, or +0.32 °C per decade. This trend is statistically significant.
The number of frost days there went from about 113 to 73 per year over the period.
The hottest day of the period reached 39.2 °C (on 20 August 2012) and the coldest -28.1 °C (on 10 February 1956).
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
SlanýCentral Bohemia
- coords
- 50.23°, 14.09°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.7°C
Average daily high
12.7°C
Average daily low
4.9°C
Annual rainfall
581mm
Sunshine / day
7.7h
Mean relative humidity
75%
Average peak wind
15.9km/h
Seasonal range
19.9°C
Frost days (< 0 °C)
93 d/yr
Hot days (≥ 30 °C)
7 d/yr
Rainy days (≥ 1 mm)
121 d/yr
Annual snowfall
42.3 cm
Average feels-like high
10.1 °C
Average feels-like low
2.2 °C
Average peak gust
32.9 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
11.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.7 °C
since 1940
+0.3 °C per decade · r² = 0.52 · 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
39.2 °C
20 August 2012
Coldest day
-28.1 °C
10 February 1956
Wettest day
85 mm
12 August 2002
Windiest day
50.2 km/h
18 January 2007
Strongest gust
121.7 km/h
18 January 2007
Hottest feels-like
39.4 °C
20 August 1943
Coldest feels-like
-33.2 °C
10 February 1956
Snowiest day
18.4 cm
26 November 1969
Sunniest day
16.0 h
6 June 2010
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 | 4.3 °C | +3.3 °C | 40 mm | +9 mm |
| Feb | 3.6 °C | +0.7 °C | 10 mm | -20 mm |
| Mar | 11.5 °C | +3.8 °C | 23 mm | -14 mm |
| Apr | 16.8 °C | +3.7 °C | 47 mm | +4 mm |
| May | 18.4 °C | +0.5 °C | 45 mm | -19 mm |
| Jun | 25.9 °C | +4.5 °C | 43 mm | -30 mm |
| Jul | 24.8 °C | +1.3 °C | 78 mm | +5 mm |
| Aug | 26.5 °C | +3.1 °C | 32 mm | -35 mm |
| Sep | 20.6 °C | +1.5 °C | 82 mm | +35 mm |
| Oct | 12.7 °C | -0.3 °C | 42 mm | +3 mm |
| Nov | 6.6 °C | +0.3 °C | 39 mm | +0 mm |
| Dec | 4.3 °C | +1.7 °C | 16 mm | -20 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 Slaný?
Slaný has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.7 °C and it receives 581 mm of precipitation per year.
What is the hottest day ever recorded in Slaný?
The hottest day measured in Slaný between 1940 and 2025 was 20 August 2012, reaching 39.2 °C.
What is the coldest day in Slaný?
The coldest day measured in Slaný between 1940 and 2025 was 10 February 1956, at -28.1 °C.
Does it snow in Slaný?
Yes. Slaný gets on average 42.3 cm of snow per year and has around 93 frost days.
Has the climate of Slaný warmed?
Yes: Slaný warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Slaný?
The wettest day measured in Slaný between 1940 and 2025 was 12 August 2002, with 85 mm of rain in 24 hours.
What was the windiest day in Slaný?
The windiest day measured in Slaný between 1940 and 2025 was 18 January 2007, with winds reaching 50.2 km/h.
What is the warmest month in Slaný?
The warmest month in Slaný is July (18.6 °C on average); the coldest is January (-1.3 °C).
How much does it rain in Slaný?
Slaný receives on average 581 mm of precipitation per year, spread over about 121 rainy days.
Is it sunny in Slaný?
Slaný gets on average 7.7 hours of sunshine per day, roughly 2,811 hours per year over 1940-2025.
What is the biggest single-day snowfall in Slaný?
The heaviest 24-hour snowfall measured in Slaný between 1940 and 2025 was 26 November 1969, with 18.4 cm.
Are there tropical nights in Slaný?
Yes: Slaný has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Slaný?
In Slaný, between 1940 and 2025, the highest apparent temperature reached 39.4 °C on 20 August 1943, and the lowest was -33.2 °C on 10 February 1956.
Compare Slaný with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Slaný