Annual mean 10°C · wettest around May · prevailing wind SW
Warmest
27.4 °C
Coldest
-3.7 °C
Wettest
53%
Windiest
6.1 m/s
Prevailing
SW
4.8 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 DeKalb over the whole year is 10°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -6°C. DeKalb has no sharply defined rainy season: the chance of rain on a given day runs from 41% in February, the driest month, to 49% in May, the wettest. Winds in DeKalb are highest in March, averaging 4.6 m/s (17 km/h), and lightest in August, at 2.3 m/s (8 km/h). The prevailing wind is from the SW. The clearest skies in DeKalb come in August, when the sky is typically 36% covered; January is the cloudiest month, at 61%.
Month by month DeKalb 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
-3°C
-6°C
-9°C
44%
61%
4.2 m/s
0
0
1
February
0°C
-5°C
-6°C
41%
50%
4.4 m/s
1
0
7
March
7°C
1°C
1°C
47%
53%
4.6 m/s
3
0
19
April
13°C
5°C
7°C
46%
51%
4.6 m/s
18
1
44
May
20°C
12°C
16°C
49%
47%
3.9 m/s
51
12
60
June
26°C
18°C
25°C
48%
37%
3.4 m/s
58
43
34
July
27°C
20°C
28°C
49%
36%
2.5 m/s
48
58
17
August
26°C
18°C
26°C
47%
36%
2.3 m/s
55
52
23
September
24°C
14°C
22°C
48%
37%
2.7 m/s
64
32
48
October
15°C
8°C
11°C
48%
46%
3.5 m/s
32
4
57
November
7°C
1°C
2°C
44%
48%
4.0 m/s
6
0
23
December
1°C
-3°C
-5°C
46%
56%
4.1 m/s
0
0
5
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 DeKalb weather by season
Year round, DeKalb has days of about -3°C at their warmest in January, its coolest month, and 27°C in July, its warmest; the coolest hours of the day run from -6°C to 20°C through the year, and the average temperature over the year is 10°C around the clock. Rain is most likely around May and least likely around February. 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.
DeKalb weather in winterDecember to February
High -1°CLow -5°CRain 44%
Winter in DeKalb has typical daily highs of about -1°C and lows of about -5°C, with a 44% chance of rain on a given day.
DeKalb weather in springMarch to May
High 13°CLow 6°CRain 47%
Spring in DeKalb has typical daily highs of about 13°C and lows of about 6°C, with a 47% chance of rain on a given day.
DeKalb weather in summerJune to August
High 26°CLow 18°CRain 48%
Summer in DeKalb has typical daily highs of about 26°C and lows of about 18°C, with a 48% chance of rain on a given day.
DeKalb weather in autumnSeptember to November
High 15°CLow 8°CRain 47%
Autumn in DeKalb has typical daily highs of about 15°C and lows of about 8°C, with a 47% chance of rain on a given day.
When is the rainy season in DeKalb?
DeKalb has no sharply defined rainy season: the chance of rain on a given day runs from 41% in February, the driest month, to 49% in May, the wettest.
What time of year is DeKalb windiest?
Winds in DeKalb are highest in March, averaging 4.6 m/s (17 km/h), and lightest in August, at 2.3 m/s (8 km/h). The prevailing wind is from the SW.
What is the average temperature in DeKalb year round?
The average temperature in DeKalb over the whole year is 10°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -6°C.