Average annual temperature is 12.7 °C
Absolute maximum temperature: 34.7 °C
Absolute minimum temperature: -11.4 °C
Number of sunny days: 182 days
Number of rainy days: 176 days
Number of snow days: 7 days
Look at detailed online map of Township of Letterkenny
* Weather data for Township of Letterkenny 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) | 15.9 | 21.0 | 22.1 | 30.2 | 28.5 | 33.5 | 34.6 | 33.3 | 34.7 | 27.4 | 21.2 | 14.7 |
| Average daytime temperature (°C) | 7.7 | 10.2 | 10.9 | 20.0 | 22.2 | 26.4 | 30.4 | 28.9 | 24.8 | 19.1 | 11.3 | 8.7 |
| Average temperature (°C) | 3.8 | 4.2 | 5.0 | 13.1 | 15.3 | 20.0 | 24.5 | 22.8 | 19.2 | 13.7 | 5.8 | 4.4 |
| Average night temperature (°C) | 0.9 | -0.6 | 0.2 | 7.0 | 8.8 | 14.0 | 19.1 | 17.7 | 14.5 | 9.1 | 1.4 | 0.9 |
| Absolute minimum temperature (°C) | -4.0 | -11.4 | -6.4 | -0.1 | 2.2 | 8.7 | 15.7 | 13.6 | 8.4 | 2.0 | -6.1 | -4.3 |
| 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 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.7 | 10.7 | 12.0 | 13.3 | 14.4 | 15.0 | 14.7 | 13.7 | 12.5 | 11.1 | 10.0 | 9.4 |
| 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) | 4.8 | 7.0 | 7.4 | 9.2 | 10.9 | 10.6 | 12.3 | 10.8 | 8.7 | 7.7 | 7.6 | 4.3 |
| Precipitation (mm) | 85 | 37 | 77 | 87 | 35 | 80 | 113 | 83 | 98 | 50 | 57 | 96 |
| Sunny days | 11 | 17 | 12 | 17 | 20 | 12 | 7 | 11 | 17 | 19 | 23 | 16 |
| Rainy days | 19 | 8 | 17 | 13 | 11 | 18 | 24 | 20 | 13 | 12 | 7 | 14 |
| Snow days | 1 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The best time to visit Township of Letterkenny during the most sunny months:
The largest precipitation sum in Township of Letterkenny is at