Celje climate — normals and trends
Celje (Slovenia) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.6 °C and it receives 960 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 (19.6 °C on average) and the coldest is January (-1.2 °C). Rainfall peaks in June.
Celje averages 91 frost days, 6 hot days (≥ 30 °C) and 129 rainy days per year.
Celje 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 110 to 72 per year over the period.
The hottest day of the period reached 37.0 °C (on 8 August 2013) and the coldest -28.5 °C (on 23 January 1942).
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
CeljeUrban Municipality of Celje
- coords
- 46.23°, 15.26°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.6°C
Average daily high
13.8°C
Average daily low
5.6°C
Annual rainfall
960mm
Sunshine / day
8.3h
Mean relative humidity
77%
Average peak wind
10.8km/h
Seasonal range
20.8°C
Frost days (< 0 °C)
91 d/yr
Hot days (≥ 30 °C)
6 d/yr
Rainy days (≥ 1 mm)
129 d/yr
Annual snowfall
83.5 cm
Average feels-like high
12.3 °C
Average feels-like low
3.7 °C
Average peak gust
30.5 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
12.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.56 · 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
37.0 °C
8 August 2013
Coldest day
-28.5 °C
23 January 1942
Wettest day
62 mm
13 July 1972
Windiest day
32.7 km/h
30 March 1995
Strongest gust
90.7 km/h
21 May 1984
Hottest feels-like
39.2 °C
27 June 2019
Coldest feels-like
-33.0 °C
23 January 1942
Snowiest day
23.2 cm
8 December 1965
Sunniest day
15.1 h
22 June 2025
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 | 6.0 °C | +3.9 °C | 49 mm | +2 mm |
| Feb | 5.0 °C | +0.2 °C | 54 mm | +3 mm |
| Mar | 12.6 °C | +3.1 °C | 122 mm | +58 mm |
| Apr | 17.0 °C | +2.6 °C | 63 mm | -22 mm |
| May | 18.9 °C | +0.1 °C | 105 mm | +7 mm |
| Jun | 27.5 °C | +5.1 °C | 39 mm | -68 mm |
| Jul | 25.9 °C | +1.4 °C | 123 mm | +19 mm |
| Aug | 26.0 °C | +1.9 °C | 49 mm | -41 mm |
| Sep | 21.4 °C | +1.5 °C | 99 mm | +13 mm |
| Oct | 14.7 °C | +0.3 °C | 68 mm | -11 mm |
| Nov | 9.1 °C | +1.2 °C | 88 mm | +2 mm |
| Dec | 4.1 °C | +0.8 °C | 38 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 Celje?
Celje has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 9.6 °C and it receives 960 mm of precipitation per year.
What is the hottest day ever recorded in Celje?
The hottest day measured in Celje between 1940 and 2025 was 8 August 2013, reaching 37.0 °C.
What is the coldest day in Celje?
The coldest day measured in Celje between 1940 and 2025 was 23 January 1942, at -28.5 °C.
Does it snow in Celje?
Yes. Celje gets on average 83.5 cm of snow per year and has around 91 frost days.
Has the climate of Celje warmed?
Yes: Celje warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Celje?
The wettest day measured in Celje between 1940 and 2025 was 13 July 1972, with 62 mm of rain in 24 hours.
What was the windiest day in Celje?
The windiest day measured in Celje between 1940 and 2025 was 30 March 1995, with winds reaching 32.7 km/h.
What is the warmest month in Celje?
The warmest month in Celje is July (19.6 °C on average); the coldest is January (-1.2 °C).
How much does it rain in Celje?
Celje receives on average 960 mm of precipitation per year, spread over about 129 rainy days.
Is it sunny in Celje?
Celje gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.
What is the biggest single-day snowfall in Celje?
The heaviest 24-hour snowfall measured in Celje between 1940 and 2025 was 8 December 1965, with 23.2 cm.
Are there tropical nights in Celje?
Yes: Celje has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Celje?
In Celje, between 1940 and 2025, the highest apparent temperature reached 39.2 °C on 27 June 2019, and the lowest was -33.0 °C on 23 January 1942.
Compare Celje with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Celje