Average annual temperature is 7.0 °C
Absolute maximum temperature: 34.2 °C
Absolute minimum temperature: -29.0 °C
Number of sunny days: 183 days
Number of rainy days: 131 days
Number of snow days: 51 days
Look at detailed online map of Heinola
* Weather data for Heinola United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 2.3 | 6.0 | 3.8 | 23.3 | 31.4 | 32.0 | 32.5 | 34.2 | 34.2 | 29.2 | 14.0 | 8.6 |
| Average daytime temperature (°C) | -5.4 | -3.5 | -1.1 | 8.1 | 22.2 | 27.3 | 25.8 | 26.7 | 23.8 | 12.8 | 5.1 | 2.4 |
| Average temperature (°C) | -8.7 | -9.0 | -5.9 | 2.5 | 15.5 | 21.3 | 20.3 | 21.0 | 18.2 | 8.6 | 0.5 | -1.0 |
| Average night temperature (°C) | -11.6 | -13.9 | -10.2 | -1.8 | 9.1 | 15.8 | 15.0 | 16.0 | 13.6 | 5.3 | -2.9 | -3.6 |
| Absolute minimum temperature (°C) | -26.6 | -29.0 | -18.5 | -11.7 | -1.1 | 8.7 | 10.2 | 12.2 | 6.2 | -6.2 | -13.7 | -14.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 8.0 |
| Daylight mean duration (h) | 9.1 | 10.3 | 11.9 | 13.6 | 15.0 | 15.7 | 15.4 | 14.1 | 12.6 | 10.9 | 9.4 | 8.7 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 8.0 | 8.0 |
| Sunshine mean duration (h) | 3.0 | 7.1 | 7.1 | 8.0 | 11.7 | 12.8 | 13.0 | 11.4 | 9.7 | 6.6 | 5.6 | 3.5 |
| Precipitation (mm) | 19 | 26 | 44 | 70 | 63 | 123 | 31 | 52 | 82 | 70 | 15 | 74 |
| Sunny days | 20 | 19 | 13 | 10 | 18 | 10 | 13 | 12 | 16 | 14 | 20 | 18 |
| Rainy days | 1 | 2 | 3 | 13 | 13 | 20 | 18 | 19 | 14 | 14 | 6 | 8 |
| Snow days | 10 | 7 | 15 | 7 | 0 | 0 | 0 | 0 | 0 | 3 | 4 | 5 |
The best time to visit Heinola during the most sunny months:
Months with the longest average daylight duration in Heinola:
The largest precipitation sum in Heinola is at