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Ilirska Bistrica, Slovenia climate
Cfb Oceanic / temperate
Ilirska Bistrica has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is August with an average daily high near 26°C, while the coldest is January averaging around −3°C at night. Precipitation is fairly even year-round, totalling about 1525 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Ilirska Bistrica climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 4 | 6 | 10 | 15 | 20 | 24 | 26 | 26 | 20 | 15 | 9 | 5 |
| Avg temp (°C) | 1 | 2 | 5 | 9 | 14 | 17 | 19 | 20 | 15 | 11 | 6 | 1 |
| Avg low (°C) | −3 | −3 | 0 | 4 | 8 | 11 | 13 | 13 | 10 | 6 | 3 | −2 |
| Precipitation (mm) | 91 | 106 | 99 | 112 | 129 | 124 | 98 | 111 | 162 | 168 | 181 | 144 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 4 | 6 | 10 | 15 | 20 | 24 |
| Avg temp (°C) | 1 | 2 | 5 | 9 | 14 | 17 |
| Avg low (°C) | −3 | −3 | 0 | 4 | 8 | 11 |
| Precipitation (mm) | 91 | 106 | 99 | 112 | 129 | 124 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 26 | 20 | 15 | 9 | 5 |
| Avg temp (°C) | 19 | 20 | 15 | 11 | 6 | 1 |
| Avg low (°C) | 13 | 13 | 10 | 6 | 3 | −2 |
| Precipitation (mm) | 98 | 111 | 162 | 168 | 181 | 144 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 10 | 10 | 13 | 14 | 12 | 11 | 10 | 11 | 13 | 14 | 12 |
| Days with high ≥ 32°C (days) | — | — | — | — | — | 0.2 | 2 | 2 | — | — | — | — |
| Days with low ≤ 0°C (days) | 23 | 20 | 15 | 6 | 0.3 | — | — | — | 0.1 | 3 | 10 | 21 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 10 | 10 | 13 | 14 | 12 |
| Days with high ≥ 32°C (days) | — | — | — | — | — | 0.2 |
| Days with low ≤ 0°C (days) | 23 | 20 | 15 | 6 | 0.3 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 10 | 11 | 13 | 14 | 12 |
| Days with high ≥ 32°C (days) | 2 | 2 | — | — | — | — |
| Days with low ≤ 0°C (days) | — | — | 0.1 | 3 | 10 | 21 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 69 | 68 | 66 | 67 | 64 | 59 | 49 | 48 | 59 | 67 | 74 | 71 |
| Relative humidity (%) | 91 | 87 | 82 | 78 | 77 | 75 | 72 | 70 | 77 | 85 | 90 | 91 |
| Wind speed (mph) | 0.8 | 1.0 | 0.9 | 0.5 | 0.3 | 0.3 | 0.4 | 0.4 | 0.3 | 0.3 | 0.3 | 0.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 69 | 68 | 66 | 67 | 64 | 59 |
| Relative humidity (%) | 91 | 87 | 82 | 78 | 77 | 75 |
| Wind speed (mph) | 0.8 | 1.0 | 0.9 | 0.5 | 0.3 | 0.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 49 | 48 | 59 | 67 | 74 | 71 |
| Relative humidity (%) | 72 | 70 | 77 | 85 | 90 | 91 |
| Wind speed (mph) | 0.4 | 0.4 | 0.3 | 0.3 | 0.3 | 0.5 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Postojna, a weather station, about 26 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.