Photo: Matthew Binebrink · CC BY-SA 4.0 · Wikimedia Commons
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Climate guideThirty-year normals for Frederick, Maryland
Frederick climate by month
Humid subtropical · CfaBest Apr · Sep–Oct
Annual mean56°day and night
Seasonal swing44°warmest vs coolest
Precipitation40.5 in127 wet days a year
39.41° N, 77.41° WElevation 285 ftUTC−4 · Eastern Daylight Time
When to goFrederick · weather score
Best timeApr · Sep–Oct
October: high / low68° / 46°
iSummary
What the weather is like
Frederick has a humid subtropical climate (Köppen Cfa): rain spread through the year and no real dry season.
The warmest month is July, when afternoons average 88° and nights 67°. January is the coolest month, with highs of 42° and lows of 25°. The difference between the warmest and the coolest month is about 44°, a large swing typical of continental interiors.
About 40.5 in of precipitation falls in an average year. July is the wettest month (3.7 in, 14 wet days) and November the driest (3.2 in, 8 wet days). Cloud cover ranges from 30% in July to 41% in January.
Compared with Washington, the capital, Frederick is 0.7° cooler on a July afternoon and receives less precipitation over the year.
Year in figures
- Hottest afternoons
- 88° · July
- Coldest nights
- 25° · January
- Wettest month
- July
- Driest month
- November
- Clearest skies
- July · 30% cloud
- Longest day
- 14 h 56 min
- Shortest day
- 9 h 24 min
iiCharts
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columnsTemperature curve
Average high, lowDaylight
Hours between sunrise and sunset on the 15th of each monthiiiData table
Climate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 42° | 46° | 54° | 67° | 75° | 84° | 88° | 86° | 79° | 68° | 56° | 46° |
| Average low | 25° | 26° | 33° | 43° | 53° | 62° | 67° | 65° | 58° | 46° | 36° | 29° |
| Precipitation | 2.8 in | 2.8 in | 3.5 in | 3.5 in | 4.1 in | 3.5 in | 3.7 in | 3.5 in | 3.6 in | 3.1 in | 3.2 in | 3.1 in |
| Wet days (≥1 mm) | 8.2 | 8.4 | 9.9 | 10.7 | 13.2 | 13.8 | 14 | 13.4 | 9.4 | 9.3 | 7.8 | 9.2 |
| Cloud cover | 41% | 41% | 40% | 38% | 37% | 33% | 30% | 31% | 34% | 32% | 38% | 40% |
| Daylight | 9h 42 | 10h 44 | 11h 55 | 13h 14 | 14h 20 | 14h 56 | 14h 41 | 13h 44 | 12h 28 | 11h 12 | 10h 02 | 9h 24 |
| Month score | 34 | 34 | 42 | 71 | 66 | 50 | 42 | 47 | 71 | 77 | 53 | 32 |
ivMonth by month
Frederick in every month
January34
42° / 25°
2.8 in · 8.2 wet days
February34
46° / 26°
2.8 in · 8.4 wet days
March42
54° / 33°
3.5 in · 9.9 wet days
April71
67° / 43°
3.5 in · 10.7 wet days
May66
75° / 53°
4.1 in · 13.2 wet days
June50
84° / 62°
3.5 in · 13.8 wet days
July42
88° / 67°
3.7 in · 14 wet days
August47
86° / 65°
3.5 in · 13.4 wet days
September71
79° / 58°
3.6 in · 9.4 wet days
October77
68° / 46°
3.1 in · 9.3 wet days
November53
56° / 36°
3.2 in · 7.8 wet days
December32
46° / 29°
3.1 in · 9.2 wet days