Annual mean 12°C · wettest around March · prevailing wind SW
Warmest
28.1 °C
Coldest
-0.6 °C
Wettest
37%
Windiest
5.7 m/s
Prevailing
SW
4.5 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Delaware over the whole year is 12°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -3°C. Delaware has no sharply defined rainy season: the chance of rain on a given day runs from 31% in August, the driest month, to 37% in March, the wettest. Winds in Delaware are highest in March, averaging 4.2 m/s (15 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the SW. The clearest skies in Delaware come in July, when the sky is typically 37% covered; January is the cloudiest month, at 70%.
Month by month Delaware climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
0°C
-3°C
-6°C
36%
70%
4.1 m/s
0
0
6
February
4°C
-1°C
-2°C
36%
59%
4.1 m/s
2
0
14
March
9°C
2°C
3°C
37%
55%
4.2 m/s
9
0
31
April
14°C
7°C
10°C
37%
52%
4.0 m/s
30
2
55
May
21°C
14°C
18°C
37%
50%
3.5 m/s
59
18
60
June
26°C
19°C
25°C
34%
39%
3.2 m/s
63
43
35
July
28°C
21°C
28°C
34%
37%
2.6 m/s
42
67
12
August
27°C
19°C
27°C
31%
40%
2.4 m/s
52
58
20
September
24°C
15°C
23°C
33%
38%
2.5 m/s
65
40
44
October
18°C
10°C
14°C
35%
46%
3.1 m/s
44
10
63
November
9°C
3°C
4°C
35%
51%
3.6 m/s
9
0
34
December
4°C
-0°C
-2°C
36%
64%
3.8 m/s
0
0
12
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Delaware weather by season
Year round, Delaware has days of about 0°C at their warmest in January, its coolest month, and 28°C in July, its warmest; the coolest hours of the day run from -3°C to 21°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around March and least likely around August. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Delaware weather in winterDecember to February
High 2°CLow -1°CRain 36%
Winter in Delaware has typical daily highs of about 2°C and lows of about -1°C, with a 36% chance of rain on a given day.
Delaware weather in springMarch to May
High 15°CLow 8°CRain 37%
Spring in Delaware has typical daily highs of about 15°C and lows of about 8°C, with a 37% chance of rain on a given day.
Delaware weather in summerJune to August
High 27°CLow 19°CRain 33%
Summer in Delaware has typical daily highs of about 27°C and lows of about 19°C, with a 33% chance of rain on a given day.
Delaware weather in autumnSeptember to November
High 17°CLow 9°CRain 34%
Autumn in Delaware has typical daily highs of about 17°C and lows of about 9°C, with a 34% chance of rain on a given day.
When is the rainy season in Delaware?
Delaware has no sharply defined rainy season: the chance of rain on a given day runs from 31% in August, the driest month, to 37% in March, the wettest.
What time of year is Delaware windiest?
Winds in Delaware are highest in March, averaging 4.2 m/s (15 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the SW.
What is the average temperature in Delaware year round?
The average temperature in Delaware over the whole year is 12°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -3°C.