Average annual temperature is 12.2 °C
Absolute maximum temperature: 30.6 °C
Absolute minimum temperature: -22.2 °C
Number of sunny days: 175 days
Number of rainy days: 185 days
Number of snow days: 5 days
Look at detailed online map of Town of Portsmouth
* Weather data for Town of Portsmouth 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) | 11.9 | 17.9 | 14.9 | 27.3 | 27.0 | 26.0 | 30.6 | 29.5 | 29.7 | 25.2 | 15.1 | 13.3 |
| Average daytime temperature (°C) | 6.8 | 6.1 | 8.3 | 15.4 | 19.7 | 22.3 | 26.8 | 25.2 | 22.2 | 17.7 | 9.4 | 7.1 |
| Average temperature (°C) | 3.2 | 1.8 | 4.2 | 10.9 | 14.7 | 18.3 | 24.1 | 22.2 | 19.8 | 15.0 | 6.6 | 4.8 |
| Average night temperature (°C) | 0.0 | -2.3 | 0.4 | 7.0 | 10.1 | 15.2 | 22.1 | 19.9 | 17.9 | 12.9 | 4.3 | 3.0 |
| Absolute minimum temperature (°C) | -4.6 | -22.2 | -4.1 | -1.6 | 4.3 | 8.8 | 17.4 | 16.7 | 11.3 | 6.5 | -1.7 | -4.0 |
| 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 | 14.9 | 13.8 | 12.5 | 11.1 | 9.9 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 4.1 | 6.2 | 7.4 | 8.7 | 11.7 | 10.0 | 11.1 | 9.9 | 7.4 | 7.8 | 7.2 | 5.3 |
| Precipitation (mm) | 195 | 63 | 113 | 82 | 80 | 115 | 164 | 133 | 186 | 125 | 30 | 157 |
| Sunny days | 10 | 12 | 16 | 15 | 21 | 10 | 12 | 14 | 14 | 14 | 22 | 15 |
| Rainy days | 20 | 13 | 15 | 15 | 10 | 20 | 19 | 17 | 16 | 17 | 8 | 15 |
| Snow days | 1 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Town of Portsmouth during the most sunny months:
The largest precipitation sum in Town of Portsmouth is at