Climate averages 1991–2020
Pori 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 Pori: daytime highs average 0.4°C and nights cool to about -2.9°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 52 mm of precipitation on roughly 12 days, which makes December a month with moderate precipitation (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 5 h 33 min on an average December day.
The nearest other city in this atlas is Tampere (106 km away). In December its highs average -1.5°C, 1.8°C cooler than Pori, with 46 mm of precipitation.
Among the 13 cities listed in Finland, Pori ranks joint 1st of 13 for the warmest December highs and joint 6th of 13 for the driest December (precipitation, lowest first). The mean December high of those 13 cities is -1.3°C; Pori is 1.6°C warmer than that mean.
From December to January, average highs fall by 1.8°C to -1.5°C, and monthly precipitation falls from 52 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
Pori climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -1.5°C-5.3°C | -5.3°C | 43 | 10.2 | 6.46 h |
| February | -2.1°C-6.5°C | -6.5°C | 34 | 8.0 | 8.99 h |
| March | 1.2°C-4.1°C | -4.1°C | 33 | 8.3 | 11.712 h |
| April | 7.0°C0.6°C | 0.6°C | 33 | 8.2 | 14.715 h |
| May | 12.5°C5.6°C | 5.6°C | 39 | 7.8 | 17.517 h |
| June | 16.8°C10.4°C | 10.4°C | 60 | 10.3 | 19.319 h |
| July | 20.0°C14.0°C | 14.0°C | 74 | 11.7 | 18.518 h |
| August | 19.0°C13.5°C | 13.5°C | 74 | 12.2 | 15.916 h |
| September | 14.1°C9.4°C | 9.4°C | 62 | 10.2 | 13.013 h |
| October | 7.7°C4.2°C | 4.2°C | 65 | 11.5 | 10.110 h |
| November | 3.2°C0.4°C | 0.4°C | 56 | 11.1 | 7.37 h |
| December, selected | 0.4°C-2.9°C | -2.9°C | 52 | 11.5 | 5.66 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
- Tampere in DecemberFinland · 106 kmHigh -1.5°C · Low -4.7°C · 46 mm precipitation
- Turku in DecemberFinland · 117 kmHigh 0.4°C · Low -3.5°C · 56 mm precipitation
- Mariehamn in DecemberAland Islands · 184 kmHigh 2.8°C · Low 0.4°C · 56 mm rain
- Espoo in DecemberFinland · 210 kmHigh 0.3°C · Low -3.0°C · 57 mm precipitation
- Lahti in DecemberFinland · 215 kmHigh -1.5°C · Low -5.2°C · 48 mm precipitation
- Vantaa in DecemberFinland · 220 kmHigh -0.2°C · Low -4.1°C · 55 mm precipitation
- Jyväskylä in DecemberFinland · 223 kmHigh -2.2°C · Low -6.0°C · 46 mm precipitation
- Helsinki in DecemberFinland · 224 kmHigh 0.1°C · Low -3.2°C · 55 mm precipitation
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 Pori) is explained once on the Pori year overview and on the Sources, method and limits page.