Average annual temperature is 10.9 °C
Absolute maximum temperature: 34.8 °C
Absolute minimum temperature: -23.1 °C
Number of sunny days: 157 days
Number of rainy days: 197 days
Number of snow days: 11 days
Look at detailed online map of Great Swamp
* Weather data for Great Swamp 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) | 11.0 | 14.5 | 16.1 | 33.3 | 30.5 | 33.9 | 32.2 | 29.7 | 34.8 | 26.9 | 19.1 | 15.3 |
| Average daytime temperature (°C) | 5.6 | 6.0 | 8.5 | 17.2 | 21.4 | 24.8 | 28.4 | 25.8 | 23.2 | 18.3 | 8.9 | 7.3 |
| Average temperature (°C) | 1.6 | 0.4 | 3.0 | 10.4 | 14.5 | 18.7 | 22.9 | 20.6 | 18.0 | 12.9 | 3.7 | 2.8 |
| Average night temperature (°C) | -1.5 | -4.2 | -1.5 | 5.2 | 8.0 | 13.6 | 18.6 | 16.4 | 14.2 | 8.8 | -0.2 | -0.3 |
| Absolute minimum temperature (°C) | -6.8 | -23.1 | -5.1 | -3.2 | 2.2 | 7.4 | 13.5 | 12.0 | 7.1 | 2.5 | -5.4 | -6.6 |
| 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 | 9.0 |
| Daylight mean duration (h) | 9.5 | 10.6 | 11.9 | 13.4 | 14.6 | 15.2 | 14.9 | 13.9 | 12.5 | 11.1 | 9.8 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 4.0 | 6.4 | 7.4 | 8.2 | 11.7 | 10.1 | 10.5 | 9.4 | 7.5 | 7.4 | 7.0 | 4.7 |
| Precipitation (mm) | 158 | 50 | 107 | 129 | 70 | 90 | 261 | 154 | 242 | 88 | 60 | 196 |
| Sunny days | 9 | 13 | 13 | 14 | 21 | 6 | 5 | 10 | 14 | 15 | 21 | 16 |
| Rainy days | 19 | 12 | 15 | 16 | 10 | 24 | 26 | 21 | 16 | 16 | 8 | 14 |
| Snow days | 3 | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
The best time to visit Great Swamp during the most sunny months:
The largest precipitation sum in Great Swamp is at