Average annual temperature is 13.5 °C
Absolute maximum temperature: 37.2 °C
Absolute minimum temperature: -10.9 °C
Number of sunny days: 199 days
Number of rainy days: 162 days
Number of snow days: 4 days
Look at detailed online map of Frederick County
* Weather data for Frederick County 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) | 17.8 | 22.2 | 24.6 | 31.3 | 29.4 | 32.3 | 37.2 | 35.0 | 36.4 | 27.0 | 23.6 | 18.4 |
| Average daytime temperature (°C) | 8.7 | 11.8 | 12.7 | 21.7 | 22.6 | 27.0 | 32.4 | 30.7 | 26.0 | 20.4 | 12.6 | 9.7 |
| Average temperature (°C) | 4.4 | 5.7 | 6.1 | 14.1 | 15.9 | 20.4 | 25.5 | 24.0 | 19.9 | 14.3 | 6.7 | 4.8 |
| Average night temperature (°C) | 1.2 | 0.9 | 1.1 | 7.9 | 9.7 | 14.5 | 19.4 | 18.5 | 14.9 | 9.3 | 1.9 | 1.2 |
| Absolute minimum temperature (°C) | -4.9 | -10.9 | -7.0 | -0.4 | 4.4 | 10.4 | 15.6 | 14.0 | 9.7 | 2.9 | -6.2 | -5.0 |
| 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 | 10.1 | 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) | 5.4 | 7.1 | 7.8 | 9.1 | 10.1 | 10.9 | 12.3 | 11.3 | 9.1 | 8.5 | 7.9 | 5.7 |
| Precipitation (mm) | 38 | 52 | 71 | 78 | 37 | 88 | 75 | 24 | 124 | 36 | 66 | 98 |
| Sunny days | 14 | 17 | 16 | 18 | 18 | 14 | 8 | 13 | 17 | 19 | 25 | 20 |
| Rainy days | 16 | 9 | 14 | 12 | 13 | 16 | 23 | 18 | 13 | 12 | 5 | 11 |
| Snow days | 1 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit Frederick County during the most sunny months:
The largest precipitation sum in Frederick County is at