Average annual temperature is 13.4 °C
Absolute maximum temperature: 34.4 °C
Absolute minimum temperature: -8.7 °C
Number of sunny days: 167 days
Number of rainy days: 192 days
Number of snow days: 6 days
Look at detailed online map of Londonderry
* Weather data for Londonderry 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) | 16.8 | 23.5 | 24.6 | 28.6 | 30.7 | 33.8 | 34.4 | 33.8 | 34.2 | 29.1 | 23.3 | 17.3 |
| Average daytime temperature (°C) | 8.4 | 13.0 | 12.8 | 19.4 | 23.3 | 27.0 | 30.3 | 29.2 | 26.6 | 19.9 | 13.2 | 10.0 |
| Average temperature (°C) | 3.9 | 5.9 | 6.2 | 12.6 | 16.8 | 20.9 | 24.1 | 23.0 | 20.4 | 14.4 | 7.1 | 5.1 |
| Average night temperature (°C) | 0.4 | 0.9 | 1.4 | 6.8 | 11.1 | 15.4 | 19.2 | 18.1 | 15.1 | 10.1 | 2.8 | 1.7 |
| Absolute minimum temperature (°C) | -6.5 | -8.7 | -7.2 | -0.6 | 4.0 | 10.4 | 15.1 | 12.5 | 10.5 | 2.3 | -6.8 | -4.9 |
| 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 | 14.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.8 | 10.7 | 12.0 | 13.2 | 14.3 | 14.9 | 14.6 | 13.7 | 12.4 | 11.2 | 10.0 | 9.5 |
| 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) | 4.0 | 7.3 | 7.7 | 9.2 | 10.1 | 11.1 | 11.7 | 10.7 | 9.6 | 7.2 | 7.2 | 5.1 |
| Precipitation (mm) | 132 | 48 | 104 | 78 | 62 | 77 | 94 | 93 | 40 | 70 | 47 | 59 |
| Sunny days | 7 | 15 | 15 | 15 | 20 | 12 | 7 | 13 | 17 | 13 | 20 | 13 |
| Rainy days | 23 | 13 | 13 | 15 | 11 | 18 | 24 | 18 | 13 | 18 | 9 | 17 |
| Snow days | 1 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
The best time to visit Londonderry during the most sunny months:
The largest precipitation sum in Londonderry is at