Average annual temperature is 6.7 °C
Absolute maximum temperature: 30.9 °C
Absolute minimum temperature: -32.9 °C
Number of sunny days: 117 days
Number of rainy days: 196 days
Number of snow days: 52 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) | 6.6 | 7.6 | 7.4 | 24.1 | 28.4 | 30.9 | 28.9 | 23.7 | 27.9 | 26.7 | 11.5 | 11.6 |
| Average daytime temperature (°C) | -0.5 | -1.2 | 2.2 | 11.9 | 17.0 | 20.2 | 23.8 | 20.9 | 20.0 | 14.0 | 3.5 | 2.1 |
| Average temperature (°C) | -4.0 | -6.8 | -2.2 | 5.9 | 11.1 | 15.6 | 19.6 | 16.7 | 15.5 | 9.9 | -0.6 | -1.6 |
| Average night temperature (°C) | -7.3 | -12.2 | -6.3 | 1.3 | 5.8 | 11.6 | 16.2 | 13.4 | 11.9 | 6.8 | -3.8 | -4.5 |
| Absolute minimum temperature (°C) | -19.5 | -32.9 | -11.3 | -11.7 | -1.5 | 4.8 | 10.8 | 8.9 | 6.7 | -2.9 | -11.0 | -13.3 |
| 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 | 13.5 | 14.8 | 15.5 | 15.1 | 14.0 | 12.5 | 11.0 | 9.6 | 8.9 |
| 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) | 2.9 | 6.1 | 5.9 | 7.6 | 11.3 | 8.3 | 10.2 | 9.7 | 8.2 | 5.2 | 5.9 | 3.3 |
| Precipitation (mm) | 106 | 54 | 89 | 83 | 74 | 165 | 293 | 179 | 80 | 112 | 64 | 141 |
| Sunny days | 6 | 10 | 10 | 14 | 17 | 5 | 1 | 5 | 14 | 10 | 13 | 12 |
| Rainy days | 12 | 9 | 5 | 15 | 14 | 25 | 30 | 26 | 16 | 20 | 9 | 15 |
| Snow days | 13 | 9 | 16 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 8 | 4 |
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