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Frederick Weather by Month
Average temperatures, rainfall and humidity for Frederick, United States, month by month, built from OpenWeather's historical records. Use it to see what a typical Frederick month looks like before you travel — then check the live Frederick forecast for the days ahead.
Warmest month
July
31°C average high
Coolest month
January
-2°C average low
Wettest month
May
126 mm of rain
Driest month
February
64 mm of rain
Average temperature and rainfall in Frederick by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 6°C | -2°C | -16°C / 24°C | 73 mm | 67% | 12 km/h |
| February | 9°C | 0°C | -18°C / 27°C | 64 mm | 64% | 13 km/h |
| March | 14°C | 3°C | -16°C / 30°C | 70 mm | 60% | 15 km/h |
| April | 20°C | 9°C | -4°C / 33°C | 90 mm | 60% | 14 km/h |
| May | 24°C | 14°C | 2°C / 35°C | 126 mm | 69% | 12 km/h |
| June | 29°C | 18°C | 8°C / 36°C | 103 mm | 69% | 11 km/h |
| July | 31°C | 21°C | 14°C / 39°C | 102 mm | 73% | 9 km/h |
| August | 29°C | 20°C | 11°C / 37°C | 94 mm | 74% | 9 km/h |
| September | 26°C | 17°C | 5°C / 36°C | 99 mm | 75% | 10 km/h |
| October | 20°C | 11°C | -1°C / 34°C | 89 mm | 74% | 11 km/h |
| November | 14°C | 4°C | -10°C / 27°C | 96 mm | 66% | 12 km/h |
| December | 9°C | 1°C | -14°C / 22°C | 73 mm | 70% | 11 km/h |
Best time to visit Frederick
The most comfortable time to visit Frederick is generally May and September to October, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around May, totalling about 1079 mm a year.
Travellers who prefer heat should aim for July, when highs average 31°C. May is the month to avoid if rain would spoil your plans — it averages 126 mm, roughly 2× the rainfall of February.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Frederick forecast for what is happening now.