Delaware has an average annual temperature of
55.4°F
(across all 5 cities) with approximately
1130 mm of annual precipitation
and average humidity of 78%.
The warmest city is Wilmington
with average July highs of 95.9°F,
while Wilmington
is the coldest with average January lows of 5.2°F.
This page covers 45 years of NASA POWER climate data (1981–2025)
including temperature, rainfall, humidity, wind speed, and solar radiation.
Jul is typically the warmest month across Delaware with average highs around
95°F, while
Jan is the coldest with average lows near
8.6°F.
Jul is the wettest month with approximately
118 mm of rainfall on average.
Month
Max Temp
Min Temp
Avg Temp
Rain (mm)
Humidity
Wind (m/s)
Solar (kWh/m²)
Jan
58.1°F
8.6°F
33.4°F
81
84%
2.7
2.00
Feb
58.8°F
12°F
35.4°F
73
83%
2.8
2.80
Mar
68.5°F
19.4°F
44.1°F
99
81%
2.9
3.90
Apr
77.9°F
28.8°F
53.4°F
93
78%
2.6
4.90
May
84.4°F
39.7°F
62.1°F
99
78%
2.2
5.60
Jun
90.9°F
50°F
70.5°F
102
75%
2.0
6.10
Jul
95°F
59°F
77°F
118
71%
1.8
6.00
Aug
93.6°F
56.8°F
75.2°F
105
71%
1.7
5.40
Sep
89.8°F
46.9°F
68.4°F
105
73%
2.0
4.40
Oct
81°F
34.3°F
57.7°F
90
77%
2.2
3.30
Nov
70.5°F
24.8°F
47.7°F
84
80%
2.4
2.30
Dec
61.3°F
16.3°F
38.8°F
96
84%
2.5
1.80
📈 Delaware Yearly Climate Trends
🌡️ Annual Temperature Trend
State-wide avg annual high & low · Last 10 years
📈 Delaware Long-Term Climate Trends (1981–2025)
This chart shows how Delaware's average temperatures have shifted across 45 years.
Use the range buttons to focus on recent decades or view the full historical record.
Data is averaged across all 5 cities in the state.
🌧️ Annual Precipitation Trend
State-wide avg annual precipitation · Last 10 years · mm/year
🔗 Explore Cities in Delaware
Browse detailed weather history, monthly averages, and 45-year climate trends for every city in Delaware.
Wilmington is the wettest city in Delaware with approximately 1159 mm of annual precipitation on average. View Wilmington weather history →
What is the warmest month in Delaware?▼
Jul is the warmest month across Delaware, with state-wide average highs of 95°F and average lows of 59°F.
How many cities in Delaware have weather data?▼
TownPillar has historical weather data for 5 cities in Delaware, covering 45 years of NASA POWER climate records from 1981 to 2025.
Which month has the most sunshine in Delaware?▼
Jun is the sunniest month across Delaware with an average solar radiation of 6.10 kWh/m²/day state-wide. This solar radiation data from NASA POWER is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability.
Where does this climate data come from?▼
All data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis data. It includes monthly temperature, precipitation, humidity, wind speed, and solar radiation at 0.5° × 0.625° spatial resolution.
📚 Data Source
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources). Data covers 45 years (1981–2025) across 5 cities in Delaware at monthly temporal resolution.