Average annual temperature is 9.6 °C
Absolute maximum temperature: 30.9 °C
Absolute minimum temperature: -21.5 °C
Number of sunny days: 134 days
Number of rainy days: 212 days
Number of snow days: 19 days
Look at detailed online map of Grassy Island
* Weather data for Grassy Island 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) | 13.7 | 15.0 | 14.0 | 27.5 | 28.2 | 30.9 | 30.9 | 27.8 | 30.4 | 27.2 | 16.1 | 11.5 |
| Average daytime temperature (°C) | 4.3 | 5.7 | 6.6 | 16.0 | 19.5 | 23.0 | 26.9 | 24.3 | 21.5 | 16.0 | 7.5 | 5.7 |
| Average temperature (°C) | 0.9 | -0.2 | 1.2 | 9.6 | 12.6 | 17.2 | 21.5 | 19.1 | 16.3 | 11.4 | 2.8 | 1.9 |
| Average night temperature (°C) | -2.0 | -4.8 | -3.1 | 4.4 | 5.9 | 12.0 | 16.9 | 14.7 | 12.2 | 7.6 | -0.8 | -0.9 |
| Absolute minimum temperature (°C) | -8.3 | -21.5 | -10.4 | -4.7 | -0.1 | 5.7 | 12.4 | 10.9 | 5.1 | 0.4 | -7.1 | -7.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.6 | 11.9 | 13.3 | 14.5 | 15.1 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 3.7 | 5.9 | 6.7 | 8.5 | 12.1 | 10.8 | 11.6 | 10.2 | 8.3 | 7.3 | 7.3 | 3.8 |
| Precipitation (mm) | 97 | 49 | 95 | 92 | 51 | 88 | 122 | 124 | 110 | 99 | 54 | 145 |
| Sunny days | 7 | 11 | 7 | 14 | 20 | 7 | 4 | 9 | 13 | 14 | 17 | 11 |
| Rainy days | 18 | 13 | 20 | 16 | 11 | 23 | 27 | 22 | 17 | 17 | 11 | 17 |
| Snow days | 6 | 4 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 3 |
The best time to visit Grassy Island during the most sunny months:
The largest precipitation sum in Grassy Island is at