Average annual temperature is 12.6 °C
Absolute maximum temperature: 35.3 °C
Absolute minimum temperature: -13.8 °C
Number of sunny days: 193 days
Number of rainy days: 160 days
Number of snow days: 12 days
Look at detailed online map of Potomac
* Weather data for Potomac 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) | 18.2 | 17.6 | 20.1 | 27.5 | 32.1 | 33.6 | 35.0 | 35.3 | 31.5 | 28.8 | 24.1 | 15.6 |
| Average daytime temperature (°C) | 5.6 | 9.0 | 10.1 | 18.5 | 24.8 | 28.9 | 28.8 | 27.7 | 25.4 | 18.7 | 11.9 | 8.2 |
| Average temperature (°C) | 1.4 | 2.8 | 4.5 | 11.3 | 18.3 | 22.6 | 23.5 | 22.6 | 20.0 | 13.6 | 6.4 | 4.1 |
| Average night temperature (°C) | -1.4 | -1.4 | 0.1 | 5.5 | 12.1 | 16.5 | 18.6 | 18.2 | 15.3 | 9.6 | 2.0 | 1.3 |
| Absolute minimum temperature (°C) | -12.6 | -13.8 | -10.2 | -1.8 | 2.8 | 10.0 | 14.4 | 11.5 | 10.1 | -3.0 | -9.7 | -7.7 |
| 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) | 9.7 | 10.7 | 11.9 | 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) | 3.7 | 7.4 | 6.6 | 9.3 | 11.1 | 12.4 | 12.4 | 10.8 | 9.9 | 6.9 | 7.4 | 4.6 |
| Precipitation (mm) | 65 | 81 | 102 | 56 | 52 | 31 | 116 | 154 | 60 | 118 | 17 | 71 |
| Sunny days | 11 | 17 | 14 | 16 | 18 | 22 | 11 | 16 | 15 | 16 | 20 | 17 |
| Rainy days | 12 | 9 | 16 | 14 | 13 | 8 | 20 | 15 | 15 | 15 | 9 | 14 |
| Snow days | 8 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
The best time to visit Potomac during the most sunny months:
The largest precipitation sum in Potomac is at