Wilmington weather by month
What a typical year looks like in Wilmington, Delaware: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Wilmington Airport, 9 km from Wilmington; records cover 1894–2026.
The year at a glance
- Precipitation a year
- 45.3 in1151 mm
- Snow a year
- 20 in51 cm
- Last spring freeze
- Apr 7
- First fall freeze
- Nov 4
- Heating degree days
- 4,646
- Cooling degree days
- 1,228
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 11°−12° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Wilmington in January
Highs average 41°5° and lows 26°−4°, with 3.2 in82 mm of precipitation and 6 in15 cm of snow in a typical January.
- Record high
- 75°24° (1950)
- Record low
- −14°−26° (1984)
- Heating degree days
- 976
- Cooling degree days
- 0
Wilmington in February
Highs average 44°7° and lows 27°−3°, with 2.8 in72 mm of precipitation and 8 in20 cm of snow in a typical February.
- Record high
- 78°26° (1930)
- Record low
- −15°−26° (1934)
- Heating degree days
- 824
- Cooling degree days
- 0
Wilmington in March
Highs average 53°11° and lows 34°1°, with 4.2 in106 mm of precipitation and 3 in8 cm of snow in a typical March.
- Record high
- 86°30° (1948)
- Record low
- 2°−17° (1984)
- Heating degree days
- 676
- Cooling degree days
- 1
Wilmington in April
Highs average 64°18° and lows 44°6°, with 3.5 in89 mm of precipitation and 0.1 in0.3 cm of snow in a typical April.
- Record high
- 97°36° (1896)
- Record low
- 11°−12° (1923)
- Heating degree days
- 347
- Cooling degree days
- 12
Wilmington in May
Highs average 74°23° and lows 53°12°, with 3.6 in91 mm of precipitation in a typical May.
- Record high
- 98°37° (1895)
- Record low
- 30°−1° (1978)
- Heating degree days
- 122
- Cooling degree days
- 74
Wilmington in June
Highs average 82°28° and lows 63°17°, with 4.7 in119 mm of precipitation in a typical June.
- Record high
- 102°39° (1894)
- Record low
- 40°4° (1945)
- Heating degree days
- 13
- Cooling degree days
- 241
Wilmington in July
Highs average 87°30° and lows 68°20°, with 4.4 in112 mm of precipitation in a typical July.
- Record high
- 103°39° (1936)
- Record low
- 48°9° (1988)
- Heating degree days
- 0
- Cooling degree days
- 389
Wilmington in August
Highs average 85°29° and lows 67°19°, with 4 in101 mm of precipitation in a typical August.
- Record high
- 107°42° (1918)
- Record low
- 43°6° (1982)
- Heating degree days
- 1
- Cooling degree days
- 334
Wilmington in September
Highs average 79°26° and lows 59°15°, with 4.4 in111 mm of precipitation in a typical September.
- Record high
- 100°38° (1953)
- Record low
- 32°0° (1940)
- Heating degree days
- 38
- Cooling degree days
- 155
Wilmington in OctoberThis month
Highs average 67°19° and lows 47°8°, with 3.7 in93 mm of precipitation in a typical October.
- Record high
- 98°37° (2019)
- Record low
- 23°−5° (1936)
- Heating degree days
- 266
- Cooling degree days
- 22
Wilmington in November
Highs average 56°13° and lows 37°3°, with 3.1 in78 mm of precipitation and 0.2 in0.5 cm of snow in a typical November.
- Record high
- 85°29° (1950)
- Record low
- 11°−12° (1929)
- Heating degree days
- 551
- Cooling degree days
- 0
Wilmington in December
Highs average 46°8° and lows 30°−1°, with 3.9 in98 mm of precipitation and 2.9 in7.4 cm of snow in a typical December.
- Record high
- 75°24° (1998)
- Record low
- −7°−22° (1917)
- Heating degree days
- 832
- Cooling degree days
- 0