Frederick weather by month
What a typical year looks like in Frederick, Maryland: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Damascus 3 Ssw, 25 km from Frederick; records cover 1993–2026.
The year at a glance
- Precipitation a year
- 47.9 in1216 mm
- Snow a year
- 31 in80 cm
- Last spring freeze
- Apr 10
- First fall freeze
- Oct 22
- Heating degree days
- 4,977
- Cooling degree days
- 990
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 9°−13° (heating, 99%) and 93°34° (cooling, 1%).
Month by month
Frederick in January
Highs average 39°4° and lows 25°−4°, with 3.4 in87 mm of precipitation and 9 in24 cm of snow in a typical January.
- Record high
- 72°22° (2024)
- Record low
- −12°−24° (1994)
- Heating degree days
- 1029
- Cooling degree days
- 0
Frederick in February
Highs average 43°6° and lows 26°−3°, with 3 in76 mm of precipitation and 11 in28 cm of snow in a typical February.
- Record high
- 78°26° (2018)
- Record low
- −9°−23° (1996)
- Heating degree days
- 858
- Cooling degree days
- 0
Frederick in March
Highs average 52°11° and lows 33°1°, with 4 in103 mm of precipitation and 5 in12 cm of snow in a typical March.
- Record high
- 86°30° (1998)
- Record low
- 3°−16° (2015)
- Heating degree days
- 703
- Cooling degree days
- 1
Frederick in April
Highs average 64°18° and lows 43°6°, with 3.6 in92 mm of precipitation and 0.2 in0.5 cm of snow in a typical April.
- Record high
- 91°33° (2002)
- Record low
- 22°−6° (1997)
- Heating degree days
- 364
- Cooling degree days
- 16
Frederick in May
Highs average 73°23° and lows 53°12°, with 4.4 in110 mm of precipitation in a typical May.
- Record high
- 94°34° (2026)
- Record low
- 28°−2° (1996)
- Heating degree days
- 140
- Cooling degree days
- 67
Frederick in June
Highs average 80°27° and lows 62°16°, with 4.7 in119 mm of precipitation in a typical June.
- Record high
- 96°36° (2024)
- Record low
- 38°3° (1993)
- Heating degree days
- 19
- Cooling degree days
- 194
Frederick in July
Highs average 84°29° and lows 66°19°, with 4.5 in114 mm of precipitation in a typical July.
- Record high
- 100°38° (2011)
- Record low
- 49°9° (1997)
- Heating degree days
- 1
- Cooling degree days
- 315
Frederick in August
Highs average 83°28° and lows 65°18°, with 4.2 in106 mm of precipitation in a typical August.
- Record high
- 98°37° (1997)
- Record low
- 46°8° (1994)
- Heating degree days
- 3
- Cooling degree days
- 270
Frederick in September
Highs average 76°24° and lows 58°14°, with 4.8 in121 mm of precipitation in a typical September.
- Record high
- 94°34° (2010)
- Record low
- 36°2° (1993)
- Heating degree days
- 61
- Cooling degree days
- 111
Frederick in OctoberThis month
Highs average 65°18° and lows 47°8°, with 4 in102 mm of precipitation in a typical October.
- Record high
- 90°32° (2019)
- Record low
- 22°−6° (1997)
- Heating degree days
- 310
- Cooling degree days
- 16
Frederick in November
Highs average 53°12° and lows 36°2°, with 3.5 in89 mm of precipitation and 0.8 in2 cm of snow in a typical November.
- Record high
- 79°26° (2024)
- Record low
- 15°−9° (2013)
- Heating degree days
- 605
- Cooling degree days
- 0
Frederick in December
Highs average 44°6° and lows 30°−1°, with 3.9 in99 mm of precipitation and 5 in13 cm of snow in a typical December.
- Record high
- 75°24° (1998)
- Record low
- 2°−17° (2022)
- Heating degree days
- 884
- Cooling degree days
- 0