Monthly climate averages for Frederick, United States. Based on 10-year ERA5 reanalysis data.
Cfa Humid Subtropical
Climate OverviewFrederick, United States in December has cold conditions, with highs averaging around 7.4°C (45°F). Rain falls on about 10 days this month.
This month falls at the beginning of Winter. Cold conditions dominate the month.
Temperatures remain fairly steady throughout December, with daily highs around 8°C (46°F).
Rainfall is heaviest during the middle of the month, while the first third tends to be drier.
The warmest days tend to fall around the 1th, averaging 9.1°C (48°F).
Compared to November, this month is about 5°C cooler with 3 more rainy days. Temperatures begin dropping heading into January.
Daily averages based on historical data (2016–2025)
Cold daytime highs of 7°C (45°F) mean shorter outdoor excursions with warming breaks.
Rain usually comes in shorter passing showers rather than all-day rain.
2 of the last 5 yearly records were warmer than this month's long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 5°C / -2°C | 1°C / -7°C | 9days (81 mm) Wet | 6h Fair | 68% Muggy | 2.8 Moderate | Poor | View Details |
| February | 9°C / 0°C | 5°C / -5°C | 10days (85 mm) Wet | 6.8h Fair | 68% Muggy | 3.5 Moderate | Poor | View Details |
| March | 13°C / 3°C | 10°C / -1°C | 10days (78 mm) Wet | 8.2h Good | 65% Muggy | 4.9 Moderate | Fair | View Details |
| April | 19°C / 8°C | 17°C / 5°C | 10days (87 mm) Wet | 8.9h Good | 67% Muggy | 5.8 High | Good | View Details |
| May best | 23°C / 13°C | 23°C / 12°C | 14days (119 mm) Wet | 9.2h Good | 74% Muggy | 6.3 High | Excellent | View Details |
| June best | 28°C / 18°C | 30°C / 19°C | 12days (94 mm) Wet | 11.3h Excellent | 70% Muggy | 7.2 Very High | Excellent | View Details |
| July | 32°C / 21°C | 35°C / 24°C | 13days (116 mm) Wet | 11.8h Excellent | 70% Muggy | 7.5 Very High | Fair | View Details |
| August best | 30°C / 20°C | 32°C / 22°C | 12days (93 mm) Wet | 10.6h Excellent | 74% Muggy | 6.9 High | Good | View Details |
| September best | 26°C / 17°C | 27°C / 18°C | 9days (109 mm) Wet | 8.6h Good | 74% Muggy | 5.1 High | Excellent | View Details |
| October best | 20°C / 11°C | 19°C / 10°C | 7days (70 mm) Good | 7.8h Good | 73% Muggy | 4.4 Moderate | Good | View Details |
| November | 13°C / 4°C | 10°C / 1°C | 7days (74 mm) Good | 7.1h Good | 69% Muggy | 3 Moderate | Fair | View Details |
| December | 7°C / 0°C | 4°C / -4°C | 10days (93 mm) Wet | 5.7h Fair | 72% Muggy | 2.3 Moderate | Poor | View Details |
Full winter gear is a must — insulated coat, thermal base layers, warm hat, gloves, and waterproof boots.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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