New Castle County · Delaware
Wilmington, DE weather averages
NOAA climate normals for 1991-2020, measured at Wilmington New Castle Co Ap, 8.5 km from the city centre — month by month temperature, rain and snow.
Quick answer
Wilmington averages a daily high of 64.1°F and a daily low of 45.7°F across the year, with 43.08 inches of precipitation. July is the warmest month at 86.1°F and January the coldest at 24.6°F.
- Average annual high
- 64.1°FWarmest month July
- Average annual low
- 45.7°FColdest month January
- Precipitation per year
- 43.08 inWettest month July
- Snowfall per year
- 20.2 in89.4 days at or below 32°F
Wilmington weather month by month
Normal daily high and low, precipitation and snowfall for each month, 1991-2020.
| Month | High °F | Low °F | Precip in | Snow in | Range |
|---|---|---|---|---|---|
| January | 40.2 | 24.6 | 3.01 | 5.9 | 24.6 to 40.2 degrees |
| February | 43.5 | 26.8 | 2.68 | 8.3 | 26.8 to 43.5 degrees |
| March | 52.4 | 33.6 | 3.92 | 1.9 | 33.6 to 52.4 degrees |
| April | 63.5 | 43 | 3.5 | 0.3 | 43 to 63.5 degrees |
| May | 73 | 52.6 | 3.95 | 0 | 52.6 to 73 degrees |
| June | 81.8 | 62.6 | 3.88 | 0 | 62.6 to 81.8 degrees |
| July | 86.1 | 67.6 | 4.57 | 0 | 67.6 to 86.1 degrees |
| August | 84.2 | 66.1 | 3.25 | 0 | 66.1 to 84.2 degrees |
| September | 77.4 | 58.2 | 4.32 | 0 | 58.2 to 77.4 degrees |
| October | 66.2 | 46.1 | 3.42 | 0 | 46.1 to 66.2 degrees |
| November | 55.7 | 37.4 | 3.1 | 0.4 | 37.4 to 55.7 degrees |
| December | 44.6 | 28.7 | 3.48 | 3.4 | 28.7 to 44.6 degrees |
Source: NOAA NCEI, U.S. Climate Normals 1991-2020 — station USW00013781, Wilmington New Castle Co Ap · rates as published for 1991-2020 normals
How to read Wilmington climate normals
What a climate normal is, and what it is not.
A normal is the average of thirty years of daily observations at one station — here Wilmington New Castle Co Ap, 8.5 km from the centre of Wilmington. It describes a typical year, so any single year will run warmer, cooler, wetter or drier. Readings taken at an airport on the edge of town usually sit a degree or two below a dense downtown on summer nights. Wilmington sees about 17.6 days a year at or above 90°F and about 71.6 days with a tenth of an inch of precipitation or more.
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Other Wilmington data on this site.