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Słupsk, Poland climate
Cfb Oceanic / temperate
Słupsk has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is August with an average daily high near 22°C, while the coldest is January averaging around −1°C at night. Around 668 mm of precipitation falls each year, peaking in August (82 mm) and easing off in April (28 mm). At latitude 55°N, day length swings from 7.0 hours in midwinter to 17.0 hours at midsummer.
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)Słupsk climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 3 | 3 | 6 | 11 | 15 | 19 | 21 | 22 | 18 | 13 | 7 | 4 |
| Avg temp (°C) | 1 | 1 | 3 | 7 | 11 | 15 | 18 | 18 | 15 | 10 | 5 | 2 |
| Avg low (°C) | −1 | −1 | 1 | 4 | 8 | 12 | 14 | 14 | 11 | 7 | 3 | 0 |
| Precipitation (mm) | 44 | 38 | 39 | 28 | 46 | 52 | 75 | 82 | 81 | 72 | 59 | 52 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 3 | 3 | 6 | 11 | 15 | 19 |
| Avg temp (°C) | 1 | 1 | 3 | 7 | 11 | 15 |
| Avg low (°C) | −1 | −1 | 1 | 4 | 8 | 12 |
| Precipitation (mm) | 44 | 38 | 39 | 28 | 46 | 52 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 21 | 22 | 18 | 13 | 7 | 4 |
| Avg temp (°C) | 18 | 18 | 15 | 10 | 5 | 2 |
| Avg low (°C) | 14 | 14 | 11 | 7 | 3 | 0 |
| Precipitation (mm) | 75 | 82 | 81 | 72 | 59 | 52 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 80 | 79 | 75 | 66 | 62 | 64 | 64 | 65 | 66 | 72 | 79 | 79 |
| Relative humidity (%) | 92 | 91 | 87 | 83 | 80 | 78 | 77 | 76 | 79 | 84 | 90 | 92 |
| Wind speed (mph) | 11.8 | 11.2 | 9.9 | 8.3 | 7.5 | 7.9 | 7.9 | 8.0 | 9.1 | 10.1 | 10.5 | 11.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 80 | 79 | 75 | 66 | 62 | 64 |
| Relative humidity (%) | 92 | 91 | 87 | 83 | 80 | 78 |
| Wind speed (mph) | 11.8 | 11.2 | 9.9 | 8.3 | 7.5 | 7.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 64 | 65 | 66 | 72 | 79 | 79 |
| Relative humidity (%) | 77 | 76 | 79 | 84 | 90 | 92 |
| Wind speed (mph) | 7.9 | 8.0 | 9.1 | 10.1 | 10.5 | 11.3 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Ustka, a weather station, about 17 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.