Average annual temperature is 8.3 °C
Absolute maximum temperature: 31.2 °C
Absolute minimum temperature: -29.2 °C
Number of sunny days: 156 days
Number of rainy days: 177 days
Number of snow days: 32 days
Look at detailed online map of Town of Waltham
* Weather data for Town of Waltham 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) | 8.4 | 10.2 | 8.5 | 19.7 | 29.9 | 31.2 | 30.0 | 25.9 | 30.6 | 25.9 | 12.2 | 12.1 |
| Average daytime temperature (°C) | 2.1 | -0.1 | 3.9 | 11.5 | 17.9 | 20.0 | 25.9 | 22.9 | 22.5 | 16.4 | 5.8 | 3.3 |
| Average temperature (°C) | -1.7 | -5.1 | 0.0 | 6.4 | 12.0 | 15.3 | 21.4 | 18.9 | 17.6 | 12.3 | 1.8 | -0.3 |
| Average night temperature (°C) | -5.1 | -10.0 | -3.4 | 2.4 | 7.2 | 11.9 | 18.0 | 15.6 | 14.1 | 9.2 | -1.3 | -3.4 |
| Absolute minimum temperature (°C) | -11.1 | -29.2 | -10.0 | -4.2 | 2.3 | 6.3 | 14.7 | 12.0 | 8.6 | 0.8 | -7.4 | -12.5 |
| 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 | 10.4 | 11.9 | 13.5 | 14.8 | 15.5 | 15.2 | 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) | 4.1 | 6.6 | 7.1 | 8.2 | 11.1 | 6.7 | 9.1 | 9.2 | 8.8 | 6.5 | 6.4 | 4.1 |
| Precipitation (mm) | 207 | 38 | 77 | 51 | 123 | 114 | 171 | 117 | 111 | 143 | 58 | 170 |
| Sunny days | 9 | 13 | 13 | 16 | 18 | 5 | 8 | 9 | 19 | 11 | 19 | 16 |
| Rainy days | 13 | 3 | 10 | 14 | 13 | 25 | 23 | 22 | 11 | 20 | 10 | 13 |
| Snow days | 9 | 12 | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
The best time to visit Town of Waltham during the most sunny months:
Months with the longest average daylight duration in Town of Waltham:
The largest precipitation sum in Town of Waltham is at