Average annual temperature is 11.9 °C
Absolute maximum temperature: 34.2 °C
Absolute minimum temperature: -21.8 °C
Number of sunny days: 169 days
Number of rainy days: 190 days
Number of snow days: 6 days
Look at detailed online map of Haddam
* Weather data for Haddam 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) | 17.9 | 18.5 | 14.3 | 30.9 | 27.1 | 31.1 | 31.4 | 29.5 | 34.2 | 27.8 | 18.0 | 16.7 |
| Average daytime temperature (°C) | 7.3 | 6.7 | 9.1 | 17.1 | 20.5 | 24.2 | 28.3 | 25.8 | 23.3 | 18.6 | 10.2 | 8.7 |
| Average temperature (°C) | 3.6 | 2.1 | 4.1 | 11.3 | 14.6 | 18.6 | 23.6 | 21.3 | 18.9 | 14.0 | 5.4 | 4.5 |
| Average night temperature (°C) | 0.4 | -2.1 | 0.0 | 6.6 | 9.2 | 14.1 | 20.0 | 17.5 | 15.5 | 10.5 | 1.7 | 1.4 |
| Absolute minimum temperature (°C) | -4.3 | -21.8 | -4.0 | -1.6 | 3.5 | 7.5 | 14.8 | 13.2 | 8.6 | 4.4 | -4.1 | -6.3 |
| 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 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 4.4 | 6.5 | 7.5 | 8.5 | 11.9 | 10.3 | 11.1 | 9.6 | 7.4 | 7.9 | 7.0 | 5.4 |
| Precipitation (mm) | 185 | 51 | 117 | 114 | 93 | 72 | 215 | 196 | 238 | 76 | 52 | 218 |
| Sunny days | 10 | 16 | 16 | 16 | 18 | 6 | 8 | 11 | 15 | 15 | 21 | 17 |
| Rainy days | 19 | 10 | 13 | 14 | 13 | 24 | 23 | 20 | 15 | 16 | 9 | 14 |
| Snow days | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Haddam during the most sunny months:
The largest precipitation sum in Haddam is at