Average annual temperature is 9.2 °C
Absolute maximum temperature: 33.1 °C
Absolute minimum temperature: -32.6 °C
Number of sunny days: 130 days
Number of rainy days: 206 days
Number of snow days: 29 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) | 7.0 | 12.5 | 10.7 | 28.4 | 31.1 | 33.1 | 32.1 | 28.1 | 30.5 | 27.7 | 14.9 | 10.7 |
| Average daytime temperature (°C) | 1.9 | 2.1 | 4.6 | 15.3 | 19.6 | 23.5 | 27.3 | 24.0 | 22.3 | 16.5 | 6.4 | 4.3 |
| Average temperature (°C) | -1.5 | -4.0 | -0.2 | 8.5 | 12.7 | 18.1 | 22.1 | 19.4 | 17.7 | 12.4 | 2.6 | 1.0 |
| Average night temperature (°C) | -4.5 | -9.3 | -4.8 | 3.2 | 7.0 | 13.6 | 18.4 | 16.0 | 14.0 | 9.5 | -0.1 | -1.3 |
| Absolute minimum temperature (°C) | -13.7 | -32.6 | -12.6 | -4.3 | 0.7 | 7.3 | 15.1 | 11.5 | 7.7 | 1.4 | -5.7 | -7.1 |
| 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 | 15.4 | 15.1 | 14.0 | 12.5 | 11.0 | 9.7 | 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) | 3.2 | 5.9 | 6.0 | 7.8 | 11.3 | 10.5 | 10.6 | 10.1 | 8.8 | 6.5 | 6.3 | 3.7 |
| Precipitation (mm) | 116 | 48 | 87 | 105 | 77 | 132 | 216 | 146 | 58 | 121 | 66 | 153 |
| Sunny days | 6 | 9 | 11 | 14 | 19 | 9 | 3 | 6 | 14 | 14 | 13 | 12 |
| Rainy days | 15 | 11 | 15 | 16 | 12 | 21 | 28 | 25 | 16 | 17 | 15 | 15 |
| Snow days | 10 | 8 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 4 |
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