Idrija climate — normals and trends
Idrija (Slovenia) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.3 °C and it receives 1,668 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 (19.0 °C on average) and the coldest is January (-0.8 °C). Rainfall peaks in November.
Idrija averages 87 frost days, 3 hot days (≥ 30 °C) and 154 rainy days per year.
Idrija has warmed by +2.9 °C between 1940 and 2025, or +0.34 °C per decade. This trend is statistically significant.
The number of frost days there went from about 110 to 64 per year over the period.
The hottest day of the period reached 35.7 °C (on 4 August 2013) and the coldest -29.9 °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
IdrijaMunicipality of Idrija
- coords
- 46.00°, 14.03°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.3°C
Average daily high
13.4°C
Average daily low
5.7°C
Annual rainfall
1,668mm
Sunshine / day
8.6h
Mean relative humidity
81%
Average peak wind
10.4km/h
Seasonal range
19.8°C
Frost days (< 0 °C)
87 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
154 d/yr
Annual snowfall
100.0 cm
Average feels-like high
12.1 °C
Average feels-like low
3.8 °C
Average peak gust
36.4 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.9 °C
since 1940
+0.3 °C per decade · r² = 0.64 · 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
35.7 °C
4 August 2013
Coldest day
-29.9 °C
15 February 1940
Wettest day
125 mm
25 September 1973
Windiest day
31.7 km/h
23 November 2005
Strongest gust
114.5 km/h
3 November 2023
Hottest feels-like
38.1 °C
27 June 2019
Coldest feels-like
-35.0 °C
15 February 1940
Snowiest day
37.5 cm
14 February 1952
Sunniest day
15.0 h
25 June 2023
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 5.7 °C | +3.5 °C | 186 mm | +88 mm |
| Feb | 5.2 °C | +0.8 °C | 71 mm | -30 mm |
| Mar | 11.3 °C | +2.5 °C | 239 mm | +122 mm |
| Apr | 15.7 °C | +2.3 °C | 123 mm | -20 mm |
| May | 17.4 °C | -0.4 °C | 197 mm | +42 mm |
| Jun | 26.8 °C | +5.2 °C | 21 mm | -136 mm |
| Jul | 24.2 °C | +0.3 °C | 241 mm | +106 mm |
| Aug | 24.4 °C | +0.9 °C | 154 mm | +17 mm |
| Sep | 20.1 °C | +0.7 °C | 198 mm | +40 mm |
| Oct | 13.9 °C | -0.1 °C | 165 mm | +2 mm |
| Nov | 9.2 °C | +1.4 °C | 181 mm | +7 mm |
| Dec | 6.6 °C | +3.1 °C | 27 mm | -102 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 Idrija?
Idrija has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 9.3 °C and it receives 1,668 mm of precipitation per year.
What is the hottest day ever recorded in Idrija?
The hottest day measured in Idrija between 1940 and 2025 was 4 August 2013, reaching 35.7 °C.
What is the coldest day in Idrija?
The coldest day measured in Idrija between 1940 and 2025 was 15 February 1940, at -29.9 °C.
Does it snow in Idrija?
Yes. Idrija gets on average 100.0 cm of snow per year and has around 87 frost days.
Has the climate of Idrija warmed?
Yes: Idrija warmed by +2.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Idrija?
The wettest day measured in Idrija between 1940 and 2025 was 25 September 1973, with 125 mm of rain in 24 hours.
What was the windiest day in Idrija?
The windiest day measured in Idrija between 1940 and 2025 was 23 November 2005, with winds reaching 31.7 km/h.
What is the warmest month in Idrija?
The warmest month in Idrija is July (19.0 °C on average); the coldest is January (-0.8 °C).
How much does it rain in Idrija?
Idrija receives on average 1,668 mm of precipitation per year, spread over about 154 rainy days.
Is it sunny in Idrija?
Idrija 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 Idrija?
The heaviest 24-hour snowfall measured in Idrija between 1940 and 2025 was 14 February 1952, with 37.5 cm.
Are there tropical nights in Idrija?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Idrija.
What was the most extreme apparent temperature in Idrija?
In Idrija, between 1940 and 2025, the highest apparent temperature reached 38.1 °C on 27 June 2019, and the lowest was -35.0 °C on 15 February 1940.
Compare Idrija with another city
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Nearby cities
The climate around Idrija