Annual mean 11°C · wettest around April · prevailing wind SW
Warmest
27.4 °C
Coldest
-1.6 °C
Wettest
44%
Windiest
6.2 m/s
Prevailing
SW
4.7 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 Decatur over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -4°C. Decatur has no sharply defined rainy season: the chance of rain on a given day runs from 37% in August, the driest month, to 41% in April, the wettest. Winds in Decatur are highest in March, averaging 4.4 m/s (16 km/h), and lightest in August, at 2.2 m/s (8 km/h). The prevailing wind is from the SW. The clearest skies in Decatur come in July, when the sky is typically 43% covered; January is the cloudiest month, at 71%.
Month by month Decatur 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
-1°C
-4°C
-7°C
39%
71%
4.3 m/s
0
0
3
February
2°C
-2°C
-4°C
40%
61%
4.3 m/s
1
0
11
March
8°C
2°C
2°C
41%
58%
4.4 m/s
6
0
25
April
13°C
6°C
8°C
41%
57%
4.3 m/s
23
1
50
May
20°C
13°C
17°C
41%
53%
3.7 m/s
56
15
61
June
26°C
19°C
25°C
39%
45%
3.3 m/s
64
41
37
July
27°C
20°C
28°C
38%
43%
2.4 m/s
46
62
15
August
26°C
18°C
27°C
37%
43%
2.2 m/s
54
55
24
September
24°C
15°C
23°C
38%
44%
2.4 m/s
65
35
47
October
17°C
9°C
13°C
39%
52%
3.2 m/s
40
7
62
November
8°C
3°C
3°C
38%
57%
3.8 m/s
8
0
31
December
3°C
-1°C
-3°C
40%
67%
4.1 m/s
0
0
9
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 Decatur weather by season
Year round, Decatur has days of about -1°C at their warmest in January, its coolest month, and 27°C in July, its warmest; the coolest hours of the day run from -4°C to 20°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around April 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.
Decatur weather in winterDecember to February
High 1°CLow -2°CRain 40%
Winter in Decatur has typical daily highs of about 1°C and lows of about -2°C, with a 40% chance of rain on a given day.
Decatur weather in springMarch to May
High 14°CLow 7°CRain 41%
Spring in Decatur has typical daily highs of about 14°C and lows of about 7°C, with a 41% chance of rain on a given day.
Decatur weather in summerJune to August
High 26°CLow 19°CRain 38%
Summer in Decatur has typical daily highs of about 26°C and lows of about 19°C, with a 38% chance of rain on a given day.
Decatur weather in autumnSeptember to November
High 16°CLow 9°CRain 38%
Autumn in Decatur has typical daily highs of about 16°C and lows of about 9°C, with a 38% chance of rain on a given day.
When is the rainy season in Decatur?
Decatur has no sharply defined rainy season: the chance of rain on a given day runs from 37% in August, the driest month, to 41% in April, the wettest.
What time of year is Decatur windiest?
Winds in Decatur are highest in March, averaging 4.4 m/s (16 km/h), and lightest in August, at 2.2 m/s (8 km/h). The prevailing wind is from the SW.
What is the average temperature in Decatur year round?
The average temperature in Decatur over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -4°C.