Climate averages 1991–2020
Lahti weather
in January.
A freezing month with moderate precipitation: the 11th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a freezing month in Lahti: daytime highs average -3.6°C and nights cool to about -8.0°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 41 mm of precipitation on roughly 10 days, which makes January a month with moderate precipitation (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 6 h 32 min on an average January day.
The nearest other city in this atlas is Kouvola (58 km away). In January its highs average -3.8°C, about as warm as Lahti, with 44 mm of precipitation.
Among the 13 cities listed in Finland, Lahti ranks joint 6th of 13 for the warmest January highs and joint 5th of 13 for the driest January (precipitation, lowest first). The mean January high of those 13 cities is -3.5°C; Lahti is level with that mean.
From January to February, average highs fall by 0.2°C to -3.7°C, and monthly precipitation falls from 41 mm to 34 mm.
The annual picture
January 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
Lahti climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | -3.6°C-8.0°C | -8.0°C | 41 | 10.3 | 6.57 h |
| February | -3.7°C-8.7°C | -8.7°C | 34 | 8.2 | 9.09 h |
| March | 0.7°C-5.7°C | -5.7°C | 33 | 8.4 | 11.712 h |
| April | 7.4°C-0.6°C | -0.6°C | 35 | 8.8 | 14.615 h |
| May | 14.5°C5.6°C | 5.6°C | 48 | 10.0 | 17.417 h |
| June | 18.6°C10.8°C | 10.8°C | 75 | 12.3 | 19.119 h |
| July | 21.2°C13.9°C | 13.9°C | 76 | 12.3 | 18.318 h |
| August | 19.6°C12.9°C | 12.9°C | 68 | 11.6 | 15.816 h |
| September | 14.1°C8.5°C | 8.5°C | 51 | 9.8 | 13.013 h |
| October | 7.0°C3.0°C | 3.0°C | 56 | 11.1 | 10.110 h |
| November | 1.8°C-1.3°C | -1.3°C | 50 | 10.8 | 7.47 h |
| December | -1.5°C-5.2°C | -5.2°C | 48 | 11.6 | 5.76 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
January in nearby cities
- Kouvola in JanuaryFinland · 58 kmHigh -3.8°C · Low -8.3°C · 44 mm precipitation
- Vantaa in JanuaryFinland · 84 kmHigh -2.3°C · Low -6.7°C · 48 mm precipitation
- Helsinki in JanuaryFinland · 99 kmHigh -2.1°C · Low -6.0°C · 48 mm precipitation
- Espoo in JanuaryFinland · 103 kmHigh -1.9°C · Low -5.8°C · 50 mm precipitation
- Tampere in JanuaryFinland · 116 kmHigh -3.6°C · Low -7.4°C · 39 mm precipitation
- Lappeenranta in JanuaryFinland · 136 kmHigh -4.5°C · Low -8.4°C · 42 mm precipitation
- Jyväskylä in JanuaryFinland · 140 kmHigh -4.4°C · Low -8.7°C · 38 mm precipitation
- Vyborg in JanuaryRussia · 170 kmHigh -3.9°C · Low -8.0°C · 47 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 Lahti) is explained once on the Lahti year overview and on the Sources, method and limits page.