Climate averages 1991–2020
Olsztyn weather
in December.
A cold month with moderate precipitation: the 10th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Olsztyn: daytime highs average 1.2°C and nights cool to about -2.5°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 45 mm of precipitation on roughly 10 days, which makes December a month with moderate precipitation (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 7 h 32 min on an average December day.
The nearest other city in this atlas is Elbląg (82 km away). In December its highs average 2.8°C, 1.6°C warmer than Olsztyn, with 52 mm of rain.
Among the 60 cities listed in Poland, Olsztyn ranks 59th of 60 for the warmest December highs and joint 37th of 60 for the driest December (precipitation, lowest first). The mean December high of those 60 cities is 2.4°C; Olsztyn is 1.2°C cooler than that mean.
From December to January, average highs fall by 1.6°C to -0.4°C, and monthly precipitation falls from 45 mm to 43 mm.
The annual picture
December in context
Monthly precipitation
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
Olsztyn climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -0.4°C-4.6°C | -4.6°C | 43 | 10.8 | 8.18 h |
| February | 1.0°C-4.3°C | -4.3°C | 37 | 8.9 | 9.710 h |
| March | 5.4°C-1.8°C | -1.8°C | 43 | 10.3 | 11.812 h |
| April | 12.1°C2.7°C | 2.7°C | 41 | 9.7 | 14.014 h |
| May | 17.2°C7.8°C | 7.8°C | 64 | 12.2 | 15.916 h |
| June | 20.3°C11.6°C | 11.6°C | 70 | 12.3 | 17.017 h |
| July | 22.3°C14.0°C | 14.0°C | 86 | 13.2 | 16.517 h |
| August | 22.0°C13.9°C | 13.9°C | 66 | 11.4 | 14.815 h |
| September | 17.1°C10.1°C | 10.1°C | 59 | 9.8 | 12.813 h |
| October | 11.1°C5.5°C | 5.5°C | 50 | 10.1 | 10.611 h |
| November | 5.3°C1.4°C | 1.4°C | 42 | 9.9 | 8.69 h |
| December, selected | 1.2°C-2.5°C | -2.5°C | 45 | 10.4 | 7.58 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet 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
- Elbląg in DecemberPoland · 82 kmHigh 2.8°C · Low -0.7°C · 52 mm rain
- Kaliningrad in DecemberRussia · 103 kmHigh 2.4°C · Low -1.4°C · 49 mm rain
- Grudziądz in DecemberPoland · 119 kmHigh 2.5°C · Low -1.5°C · 42 mm rain
- Gdańsk in DecemberPoland · 136 kmHigh 3.0°C · Low -0.6°C · 40 mm rain
- Płock in DecemberPoland · 147 kmHigh 2.1°C · Low -2.0°C · 41 mm rain
- Gdynia in DecemberPoland · 152 kmHigh 3.2°C · Low -0.3°C · 52 mm rain
- Toruń in DecemberPoland · 152 kmHigh 2.6°C · Low -1.4°C · 40 mm rain
- Włocławek in DecemberPoland · 158 kmHigh 2.5°C · Low -1.5°C · 42 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 Olsztyn) is explained once on the Olsztyn year overview and on the Sources, method and limits page.