Average temperature in January is -3.1 °C
Average daytime temperature is -1.1 °C
Average night temperature is -4.9 °C
Absolute maximum temperature: 2.9 °C
Absolute minimum temperature: -17.2 °C
Number of sunny days: 11
Number of rainy days: 10
Number of snow days: 10
Precipitation sum: 78 mm
* Weather data for Lahti Finland is based on climate observations for 2023 year
| January (°C) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperature | 2.9 | -2.2 | -1.9 | -5.2 | -8.1 | -11 | -8.2 | -7.3 | -4.2 | 2.1 | 2 | 2 | 2.7 | 2.5 | 2.1 | 2.1 | 1.4 | 1.6 | 0.5 | -1.1 | -3.8 | -4.3 | -2.2 | 0.1 | 2.9 | 2 | -5.3 | -0.1 | 0.8 | 2.3 | -0.6 |
| Apparent max temperature | -1.8 | -6.9 | -6.4 | -8.8 | -13.1 | -15.6 | -13.8 | -13.4 | -9.7 | -2.1 | -2.4 | -2.7 | -1.4 | -1.6 | -2.3 | -2.9 | -2.4 | -2.4 | -3.9 | -4 | -7.3 | -7.4 | -6.9 | -3.8 | -1.4 | -1.5 | -9.1 | -4.7 | -4.1 | -1.8 | -5.1 |
| Mean temperature | -2.4 | -5.2 | -4.5 | -7.1 | -11.8 | -13.7 | -9.5 | -8.9 | -5.8 | -3.8 | 1.2 | 0.9 | 0.9 | 1.9 | 1.4 | 1.3 | -0.2 | 0.5 | -0.3 | -2.6 | -5.3 | -5.7 | -4.9 | -1.2 | 1.5 | 0.1 | -7.3 | -1.9 | -1.5 | 0.7 | -2.3 |
| Apparent mean temperature | -10.2 | -14.1 | -9.9 | -14.3 | -17.8 | -22.7 | -16 | -15.6 | -13.5 | -11.5 | -5.5 | -5.1 | -4.2 | -3.3 | -4.8 | -4.6 | -6.9 | -5.1 | -5.1 | -8.5 | -13.1 | -11.2 | -11.3 | -7.4 | -5.5 | -9.2 | -14 | -9.5 | -8.5 | -6.8 | -8.8 |
| Minimum temperature | -4.9 | -9.4 | -6 | -9.5 | -12.6 | -17.2 | -10.3 | -9.7 | -8.3 | -6 | 0.5 | -0.1 | -0.9 | 0.7 | 0.8 | 0.1 | -1.4 | -0.4 | -1.1 | -4.6 | -8.3 | -7 | -7.1 | -2.5 | -1 | -4.8 | -9.5 | -4.5 | -3.8 | -1.1 | -3.4 |
| Apparent min temperature | -7.1 | -9.7 | -8.6 | -11.5 | -16.9 | -18.7 | -14.9 | -14.5 | -11.5 | -8.7 | -3.8 | -3.8 | -3 | -2.2 | -3.5 | -3.8 | -4.8 | -3.5 | -4.6 | -6 | -9.2 | -9.3 | -9.4 | -5.5 | -2.7 | -3.7 | -11.8 | -6.9 | -6.2 | -3.8 | -6.9 |
| January | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight duration (h) | 5.7 | 5.8 | 5.8 | 5.8 | 5.9 | 5.9 | 6 | 6 | 6.1 | 6.1 | 6.2 | 6.3 | 6.3 | 6.4 | 6.5 | 6.5 | 6.6 | 6.7 | 6.7 | 6.8 | 6.9 | 7 | 7 | 7.1 | 7.2 | 7.3 | 7.4 | 7.5 | 7.5 | 7.6 | 7.7 |
| Sunshine duration (h) | 3 | 2.2 | 0 | 0 | 3 | 3.3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3.9 | 2.5 | 0 | 0 | 0 | 0 | 0 | 5.4 | 1.5 | 0.7 | 0.1 | 0 |
| Precipitation (mm) | 0 | 1.2 | 1.2 | 0.5 | 0 | 0 | 0 | 1.8 | 4 | 3.6 | 2 | 4.5 | 5.6 | 3.3 | 11 | 3.8 | 3.9 | 3.6 | 15.5 | 0 | 0 | 0 | 0 | 2 | 0 | 0.4 | 0 | 2.7 | 1.5 | 6.3 | 0 |
| Precipitation hours | 0 | 6 | 10 | 2 | 0 | 0 | 0 | 12 | 12 | 15 | 7 | 16 | 9 | 14 | 12 | 13 | 9 | 8 | 14 | 0 | 0 | 0 | 0 | 7 | 0 | 4 | 0 | 6 | 4 | 21 | 0 |
| Wind speed (m/s) | 19.8 | 16.3 | 12.9 | 13.7 | 13.2 | 12.2 | 17.3 | 20.6 | 22.5 | 17.6 | 26.3 | 21.1 | 17.1 | 19.1 | 26.6 | 25.4 | 21 | 16.5 | 20.2 | 8.7 | 10.8 | 8.9 | 15.3 | 15.7 | 18.3 | 14.3 | 11.7 | 22.1 | 19.4 | 21.3 | 20.8 |
In January 2023, the highest daytime temperature in Lahti was 2.9°C.
While the minimum temperature at night dropped to -17.2°C.
The average nighttime and daytime temperatures during January in Lahti are -4.9°C and -1.1°C respectively.
The precipitation sum in January is about 78 mm.