Average annual temperature is 11.1 °C
Absolute maximum temperature: 36.6 °C
Absolute minimum temperature: -23.9 °C
Number of sunny days: 221 days
Number of rainy days: 118 days
Number of snow days: 26 days
Look at detailed online map of Dedham
* Weather data for Dedham 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) | 8.9 | 13.3 | 21.6 | 27.7 | 29.9 | 32.0 | 34.5 | 36.6 | 33.9 | 31.0 | 18.2 | 13.8 |
| Average daytime temperature (°C) | -0.1 | 3.5 | 7.0 | 17.3 | 24.6 | 28.8 | 28.1 | 28.7 | 26.3 | 17.4 | 11.0 | 6.5 |
| Average temperature (°C) | -4.1 | -2.2 | 0.9 | 10.1 | 18.1 | 22.8 | 22.7 | 23.6 | 20.6 | 12.6 | 5.4 | 1.8 |
| Average night temperature (°C) | -7.0 | -6.5 | -3.5 | 4.8 | 12.3 | 17.1 | 17.8 | 19.1 | 16.0 | 8.6 | 1.1 | -1.4 |
| Absolute minimum temperature (°C) | -23.9 | -23.4 | -13.4 | -4.9 | 2.8 | 9.5 | 10.9 | 12.8 | 10.7 | -5.1 | -9.5 | -5.7 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 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) | 9.5 | 10.6 | 11.9 | 13.4 | 14.6 | 15.2 | 14.9 | 13.8 | 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) | 4.5 | 6.9 | 7.6 | 9.3 | 11.2 | 12.3 | 12.0 | 11.6 | 9.9 | 7.5 | 7.1 | 4.9 |
| Precipitation (mm) | 54 | 70 | 40 | 32 | 41 | 66 | 100 | 96 | 45 | 56 | 7 | 45 |
| Sunny days | 14 | 19 | 18 | 16 | 19 | 16 | 18 | 17 | 19 | 17 | 23 | 25 |
| Rainy days | 5 | 7 | 8 | 13 | 12 | 14 | 13 | 14 | 11 | 13 | 5 | 3 |
| Snow days | 12 | 2 | 5 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 3 |
The best time to visit Dedham during the most sunny months:
The largest precipitation sum in Dedham is at