Delaware climate: Statewide normals, its places and each month, NOAA 1991-2020
Delaware's statewide normal is 56.2°F a year with 45.9 inches of precipitation (NOAA nClimDiv, 1991-2020); it has warmed 2.6°F per century since 1895, and 2012 was its warmest year.
- Statewide normal temperature
- 56.2°Fyear, 1991-2020
- Statewide normal precipitation
- 45.9 inyear, 1991-2020
- Last five years against normal
- +0.9°F2021-2025 mean 57.1°F
- Places with normals
- 76 Census places, 1 other stations
What is Delaware's weather like each month?
Statewide, July is the warmest month and January the coldest. Each month has its own page with the warmest and coolest places that month:
- Jan44°27°
- Feb47°28°
- Mar54°34°
- Apr65°43°
- May74°53°
- Jun83°62°
- Jul87°68°
- Aug85°66°
- Sep79°59°
- Oct68°48°
- Nov57°38°
- Dec48°31°
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 44°F | 27°F | 35.2°F | 3.35 |
| February | 47°F | 28°F | 37.1°F | 2.91 |
| March | 54°F | 34°F | 44.2°F | 4.12 |
| April | 65°F | 43°F | 54.4°F | 3.48 |
| May | 74°F | 53°F | 63.6°F | 3.58 |
| June | 83°F | 62°F | 72.6°F | 4.09 |
| July | 87°F | 68°F | 77.4°F | 4.42 |
| August | 85°F | 66°F | 75.5°F | 4.69 |
| September | 79°F | 59°F | 69.1°F | 4.22 |
| October | 68°F | 48°F | 58.0°F | 3.94 |
| November | 57°F | 38°F | 47.5°F | 3.27 |
| December | 48°F | 31°F | 39.5°F | 3.85 |
Source: NOAA NCEI nClimDiv statewide series (Climate at a Glance); data files. Statewide values are area-weighted from a 5 km grid of station data, so they differ from the simple average of a state's stations.
Has Delaware been warmer than normal?
4 of the 5 complete years since 2021 ran warmer than the 1991-2020 statewide normal of 56.2°F. The record since 1895 rises at a fitted 2.6°F per century; the warmest year was 2012 (58.5°F).
| Year | Mean | Against normal |
|---|---|---|
| 2021 | 57.4°F | +1.2°F |
| 2022 | 56.5°F | +0.4°F |
| 2023 | 57.8°F | +1.6°F |
| 2024 | 57.6°F | +1.5°F |
| 2025 | 56.1°F | −0.1°F |
Source: NOAA NCEI nClimDiv statewide annual series.
Where is it warmest, wettest and snowiest in Delaware?
Among the places PlainClimate covers, Lewes has the warmest year (58.5°F) and Wilmington Porter Research the coolest (53.4°F); Wilmington Porter Research is the wettest (50.3 in) and Georgetown the driest (43.9 in), and Wilmington gets the most snow (20 in).
| Place | Year | July high | January low | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|
| Wilmington | 55.5°F | 87°F | 26°F | 45.3 | 20 | April 7 |
| Dover | 57.1°F | 87°F | 28°F | 47.6 | 13 | April 4 |
| Newark | 55.7°F | 89°F | 25°F | 47.0 | – | April 7 |
| Georgetown | 57.6°F | 88°F | 29°F | 43.9 | – | April 4 |
| Lewes | 58.5°F | 88°F | 30°F | 47.3 | 11 | March 29 |
| Greenwood | 55.4°F | 87°F | 25°F | 46.3 | 13 | April 11 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
What are Delaware's all-time weather records?
The official state records, reviewed by NOAA's State Climate Extremes Committee: from 110°F to −17°F.
| Record | Value | Where | When |
|---|---|---|---|
| Highest temperature | 110°F | Millsboro | July 21, 1930 |
| Lowest temperature | −17°F | Millsboro | January 17, 1893 |
| Most precipitation in 24 hours | 12.48 in | Harbeson | September 28, 2016 |
| Most snow in 24 hours | 25 in | Dover | February 19, 1979 |
| Deepest snow on the ground | 28 in | Greenwood 2.9 SE | February 7, 2010 |
Source: NOAA NCEI State Climate Extremes Committee records.
Which other NOAA stations in Delaware keep normals?
1 station in Delaware that are not a town's own record keep 1991-2020 normals too: reservoirs and dams, parks and forests, research farms, remote sites and the second stations of towns (those are shown on the town's page). Each with its normal yearly mean:
Source: NOAA NCEI 1991-2020 normals for each station.
Next
- Frost dates in DelawareLast spring and first autumn frost at every station
- Every stateCompare the statewide normals
- Lewes58.5°F a year, 47.3 in of precipitation
- Wilmington Porter Research53.4°F a year, 50.3 in of precipitation
- Wilmington55.5°F a year, 45.3 in of precipitation
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