Climate averages 1991–2020
Słupsk weather
in December.
A cold, moderately wet month: the 10th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Słupsk: daytime highs average 3.4°C and nights cool to about 0.2°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 66 mm of rain on roughly 14 days, which makes December a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 7 h 24 min on an average December day.
The nearest other city in this atlas is Koszalin (63 km away). In December its highs average 3.3°C, about as warm as Słupsk, with 58 mm of rain.
Among the 60 cities listed in Poland, Słupsk ranks joint 3rd of 60 for the warmest December highs and 60th of 60 for the driest December (rainfall, lowest first). The mean December high of those 60 cities is 2.4°C; Słupsk is 1.0°C warmer than that mean.
From December to January, average highs fall by 1.4°C to 2.1°C, and monthly rainfall falls from 66 mm to 59 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Słupsk climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.1°C-1.4°C | -1.4°C | 59 | 12.1 | 7.98 h |
| February | 2.7°C-1.4°C | -1.4°C | 47 | 11.0 | 9.710 h |
| March | 5.7°C0.2°C | 0.2°C | 51 | 10.5 | 11.812 h |
| April | 11.0°C3.6°C | 3.6°C | 36 | 8.8 | 14.014 h |
| May | 15.4°C8.1°C | 8.1°C | 56 | 10.5 | 16.016 h |
| June | 18.6°C12.1°C | 12.1°C | 68 | 11.5 | 17.117 h |
| July | 21.0°C14.8°C | 14.8°C | 91 | 13.4 | 16.717 h |
| August | 21.1°C15.1°C | 15.1°C | 85 | 13.7 | 14.915 h |
| September | 17.1°C11.8°C | 11.8°C | 78 | 12.3 | 12.813 h |
| October | 12.0°C7.6°C | 7.6°C | 80 | 13.6 | 10.611 h |
| November | 6.9°C3.5°C | 3.5°C | 65 | 13.2 | 8.69 h |
| December, selected | 3.4°C0.2°C | 0.2°C | 66 | 13.5 | 7.47 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Koszalin in DecemberPoland · 63 kmHigh 3.3°C · Low -0.1°C · 58 mm rain
- Gdynia in DecemberPoland · 97 kmHigh 3.2°C · Low -0.3°C · 52 mm rain
- Gdańsk in DecemberPoland · 106 kmHigh 3.0°C · Low -0.6°C · 40 mm rain
- Piła in DecemberPoland · 147 kmHigh 2.9°C · Low -1.0°C · 44 mm rain
- Grudziądz in DecemberPoland · 157 kmHigh 2.5°C · Low -1.5°C · 42 mm rain
- Elbląg in DecemberPoland · 158 kmHigh 2.8°C · Low -0.7°C · 52 mm rain
- Bydgoszcz in DecemberPoland · 162 kmHigh 2.7°C · Low -1.2°C · 39 mm rain
- Fordon in DecemberPoland · 164 kmHigh 2.7°C · Low -1.2°C · 40 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Słupsk) is explained once on the Słupsk year overview and on the Sources, method and limits page.