Average annual temperature is 8.5 °C
Absolute maximum temperature: 32.9 °C
Absolute minimum temperature: -20.0 °C
Number of sunny days: 158 days
Number of rainy days: 158 days
Number of snow days: 49 days
Look at detailed online map of Roscommon
* Weather data for Roscommon 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) | 4.8 | 9.9 | 11.1 | 27.2 | 31.6 | 32.9 | 31.9 | 30.2 | 31.0 | 27.7 | 14.3 | 10.0 |
| Average daytime temperature (°C) | -0.1 | 0.9 | 3.9 | 13.4 | 20.8 | 25.9 | 26.2 | 24.3 | 21.8 | 14.1 | 6.1 | 4.3 |
| Average temperature (°C) | -2.8 | -3.9 | -1.4 | 7.2 | 13.6 | 19.2 | 20.5 | 18.6 | 16.6 | 10.2 | 2.1 | 1.3 |
| Average night temperature (°C) | -5.2 | -8.0 | -5.8 | 2.4 | 7.3 | 13.3 | 15.7 | 14.3 | 12.7 | 7.5 | -0.8 | -0.9 |
| Absolute minimum temperature (°C) | -17.4 | -20.0 | -14.1 | -5.8 | -0.2 | 8.2 | 12.3 | 8.3 | 7.6 | -1.6 | -7.4 | -5.9 |
| 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) | 2.5 | 5.4 | 7.0 | 8.1 | 10.7 | 11.9 | 12.5 | 10.2 | 9.0 | 5.7 | 5.2 | 3.1 |
| Precipitation (mm) | 48 | 60 | 61 | 64 | 32 | 60 | 116 | 97 | 32 | 61 | 46 | 46 |
| Sunny days | 10 | 11 | 10 | 11 | 23 | 18 | 6 | 14 | 17 | 10 | 16 | 12 |
| Rainy days | 9 | 4 | 8 | 19 | 8 | 12 | 25 | 17 | 13 | 20 | 9 | 14 |
| Snow days | 12 | 13 | 13 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 5 | 5 |
The best time to visit Roscommon during the most sunny months:
Months with the longest average daylight duration in Roscommon:
The largest precipitation sum in Roscommon is at