North Potomac weather by month
What a typical year looks like in North Potomac, Maryland: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at VIENNA, 23 km from North Potomac; records cover 1948–2026.
The year at a glance
- Precipitation a year
- 43.6 in1107 mm
- Snow a year
- 19 in47 cm
- Last spring freeze
- Apr 11
- First fall freeze
- Nov 2
- Heating degree days
- 4,930
- Cooling degree days
- 963
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 10°−12° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
North Potomac in January
Highs average 42°6° and lows 23°−5°, with 3.3 in83 mm of precipitation and 7 in17 cm of snow in a typical January.
- Record high
- 76°24° (2024)
- Record low
- 1°−17° (2014)
- Heating degree days
- 996
- Cooling degree days
- 0
North Potomac in February
Highs average 45°7° and lows 24°−4°, with 2.6 in67 mm of precipitation and 8 in19 cm of snow in a typical February.
- Record high
- 79°26° (2000)
- Record low
- −3°−19° (1996)
- Heating degree days
- 846
- Cooling degree days
- 0
North Potomac in March
Highs average 53°12° and lows 32°0°, with 3.8 in98 mm of precipitation and 2 in5.1 cm of snow in a typical March.
- Record high
- 89°32° (1998)
- Record low
- 5°−15° (2014)
- Heating degree days
- 700
- Cooling degree days
- 1
North Potomac in April
Highs average 65°18° and lows 41°5°, with 3.4 in86 mm of precipitation in a typical April.
- Record high
- 91°33° (2002)
- Record low
- 24°−4° (2013)
- Heating degree days
- 373
- Cooling degree days
- 13
North Potomac in May
Highs average 72°22° and lows 52°11°, with 4.3 in109 mm of precipitation in a typical May.
- Record high
- 92°33° (2006)
- Record low
- 33°1° (2013)
- Heating degree days
- 156
- Cooling degree days
- 58
North Potomac in June
Highs average 80°26° and lows 61°16°, with 4.1 in105 mm of precipitation in a typical June.
- Record high
- 98°37° (2014)
- Record low
- 43°6° (2001)
- Heating degree days
- 24
- Cooling degree days
- 181
North Potomac in July
Highs average 84°29° and lows 67°19°, with 4.3 in108 mm of precipitation in a typical July.
- Record high
- 98°37° (2011)
- Record low
- 53°12° (2000)
- Heating degree days
- 0
- Cooling degree days
- 317
North Potomac in August
Highs average 82°28° and lows 65°18°, with 3.5 in90 mm of precipitation in a typical August.
- Record high
- 100°38° (2015)
- Record low
- 50°10° (2013)
- Heating degree days
- 3
- Cooling degree days
- 271
North Potomac in September
Highs average 76°24° and lows 57°14°, with 4.2 in106 mm of precipitation in a typical September.
- Record high
- 98°37° (2014)
- Record low
- 41°5° (2013)
- Heating degree days
- 62
- Cooling degree days
- 107
North Potomac in OctoberThis month
Highs average 65°19° and lows 45°7°, with 3.5 in89 mm of precipitation in a typical October.
- Record high
- 89°32° (2019)
- Record low
- 29°−2° (1997)
- Heating degree days
- 315
- Cooling degree days
- 14
North Potomac in November
Highs average 56°13° and lows 35°1°, with 3.1 in80 mm of precipitation and 0.1 in0.3 cm of snow in a typical November.
- Record high
- 81°27° (2003)
- Record low
- 17°−8° (2000)
- Heating degree days
- 595
- Cooling degree days
- 1
North Potomac in December
Highs average 46°8° and lows 28°−2°, with 3.4 in87 mm of precipitation and 2.4 in6.1 cm of snow in a typical December.
- Record high
- 78°26° (1998)
- Record low
- 5°−15° (2022)
- Heating degree days
- 860
- Cooling degree days
- 0