Postojna climate — normals and trends
Postojna (Slovenia) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.0 °C and it receives 1,589 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 (-1.1 °C). Rainfall peaks in November.
Postojna averages 93 frost days, 3 hot days (≥ 30 °C) and 150 rainy days per year.
Postojna 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 113 to 73 per year over the period.
The hottest day of the period reached 35.2 °C (on 4 August 2013) and the coldest -32.1 °C (on 15 February 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
PostojnaMunicipality of Postojna
- coords
- 45.77°, 14.22°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.0°C
Average daily high
13.1°C
Average daily low
5.3°C
Annual rainfall
1,589mm
Sunshine / day
8.6h
Mean relative humidity
80%
Average peak wind
13.3km/h
Seasonal range
19.8°C
Frost days (< 0 °C)
93 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
150 d/yr
Annual snowfall
128.6 cm
Average feels-like high
11.4 °C
Average feels-like low
3.1 °C
Average peak gust
38.5 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.8 °C
since 1940
+0.3 °C per decade · r² = 0.62 · 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
35.2 °C
4 August 2013
Coldest day
-32.1 °C
15 February 1940
Wettest day
116 mm
25 September 1973
Windiest day
39.4 km/h
2 December 1983
Strongest gust
109.1 km/h
3 November 2023
Hottest feels-like
37.8 °C
27 June 2019
Coldest feels-like
-36.7 °C
15 February 1940
Snowiest day
35.9 cm
3 March 1970
Sunniest day
14.9 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 | 5.6 °C | +3.6 °C | 134 mm | +41 mm |
| Feb | 5.1 °C | +1.1 °C | 74 mm | -26 mm |
| Mar | 11.0 °C | +2.7 °C | 246 mm | +135 mm |
| Apr | 15.4 °C | +2.4 °C | 98 mm | -35 mm |
| May | 17.4 °C | -0.1 °C | 165 mm | +20 mm |
| Jun | 26.3 °C | +5.0 °C | 17 mm | -132 mm |
| Jul | 24.2 °C | +0.6 °C | 240 mm | +111 mm |
| Aug | 24.4 °C | +1.1 °C | 124 mm | -15 mm |
| Sep | 20.2 °C | +1.1 °C | 181 mm | +25 mm |
| Oct | 13.9 °C | +0.2 °C | 140 mm | -11 mm |
| Nov | 9.3 °C | +1.7 °C | 166 mm | +2 mm |
| Dec | 6.3 °C | +3.0 °C | 31 mm | -89 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 Postojna?
Postojna has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 9.0 °C and it receives 1,589 mm of precipitation per year.
What is the hottest day ever recorded in Postojna?
The hottest day measured in Postojna between 1940 and 2025 was 4 August 2013, reaching 35.2 °C.
What is the coldest day in Postojna?
The coldest day measured in Postojna between 1940 and 2025 was 15 February 1940, at -32.1 °C.
Does it snow in Postojna?
Yes. Postojna gets on average 128.6 cm of snow per year and has around 93 frost days.
Has the climate of Postojna warmed?
Yes: Postojna warmed by +2.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Postojna?
The wettest day measured in Postojna between 1940 and 2025 was 25 September 1973, with 116 mm of rain in 24 hours.
What was the windiest day in Postojna?
The windiest day measured in Postojna between 1940 and 2025 was 2 December 1983, with winds reaching 39.4 km/h.
What is the warmest month in Postojna?
The warmest month in Postojna is July (18.7 °C on average); the coldest is January (-1.1 °C).
How much does it rain in Postojna?
Postojna receives on average 1,589 mm of precipitation per year, spread over about 150 rainy days.
Is it sunny in Postojna?
Postojna gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.
What is the biggest single-day snowfall in Postojna?
The heaviest 24-hour snowfall measured in Postojna between 1940 and 2025 was 3 March 1970, with 35.9 cm.
Are there tropical nights in Postojna?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Postojna.
What was the most extreme apparent temperature in Postojna?
In Postojna, between 1940 and 2025, the highest apparent temperature reached 37.8 °C on 27 June 2019, and the lowest was -36.7 °C on 15 February 1940.
Compare Postojna with another city
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Nearby cities
The climate around Postojna