Average annual temperature is 7.5 °C
Absolute maximum temperature: 31.5 °C
Absolute minimum temperature: -32.2 °C
Number of sunny days: 142 days
Number of rainy days: 186 days
Number of snow days: 37 days
Look at detailed online map of Town of Groton
* Weather data for Town of Groton 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) | 6.7 | 8.5 | 7.4 | 25.1 | 29.1 | 31.5 | 29.0 | 24.6 | 28.7 | 26.1 | 14.0 | 12.7 |
| Average daytime temperature (°C) | 0.9 | 0.0 | 3.1 | 12.0 | 17.9 | 20.7 | 24.8 | 21.7 | 20.5 | 14.9 | 4.8 | 3.4 |
| Average temperature (°C) | -2.7 | -5.6 | -1.2 | 6.3 | 11.8 | 15.8 | 20.4 | 17.5 | 16.2 | 10.7 | 0.4 | -0.3 |
| Average night temperature (°C) | -5.8 | -10.7 | -5.0 | 1.9 | 6.1 | 11.7 | 16.8 | 13.9 | 12.7 | 7.3 | -2.9 | -3.0 |
| Absolute minimum temperature (°C) | -14.9 | -32.2 | -10.4 | -11.1 | -1.5 | 5.5 | 11.2 | 10.0 | 5.8 | -2.1 | -9.5 | -11.8 |
| 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) | 9.3 | 10.5 | 11.9 | 13.4 | 14.7 | 15.4 | 15.1 | 14.0 | 12.5 | 11.0 | 9.7 | 9.0 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 8.0 |
| Sunshine mean duration (h) | 3.4 | 6.1 | 6.5 | 7.5 | 11.2 | 8.6 | 10.2 | 9.9 | 8.2 | 5.9 | 6.4 | 4.1 |
| Precipitation (mm) | 118 | 50 | 87 | 101 | 109 | 179 | 285 | 149 | 105 | 121 | 60 | 154 |
| Sunny days | 7 | 13 | 13 | 13 | 20 | 3 | 3 | 8 | 15 | 13 | 20 | 14 |
| Rainy days | 11 | 5 | 9 | 17 | 11 | 27 | 28 | 23 | 15 | 18 | 7 | 15 |
| Snow days | 13 | 10 | 9 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 2 |
The best time to visit Town of Groton during the most sunny months:
Months with the longest average daylight duration in Town of Groton:
The largest precipitation sum in Town of Groton is at