Annual mean 12°C · wettest around April · prevailing wind SW
Warmest
28.2 °C
Coldest
-1.4 °C
Wettest
40%
Windiest
6.2 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 Decatur 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 -4°C. Decatur has no sharply defined rainy season: the chance of rain on a given day runs from 31% in January, the driest month, to 37% in April, the wettest. Winds in Decatur are highest in March, averaging 4.8 m/s (17 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 Decatur come in September, when the sky is typically 26% covered; January is the cloudiest month, at 58%.
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
-0°C
-4°C
-6°C
31%
58%
4.5 m/s
0
0
4
February
3°C
-2°C
-3°C
31%
47%
4.6 m/s
3
0
15
March
9°C
3°C
4°C
36%
48%
4.8 m/s
8
0
30
April
15°C
7°C
10°C
37%
43%
4.6 m/s
27
2
55
May
22°C
14°C
19°C
35%
43%
3.9 m/s
59
23
55
June
27°C
20°C
27°C
33%
27%
3.3 m/s
52
53
24
July
28°C
21°C
29°C
35%
28%
2.5 m/s
32
63
8
August
27°C
19°C
28°C
33%
29%
2.4 m/s
43
58
16
September
25°C
15°C
25°C
32%
26%
2.6 m/s
58
46
36
October
18°C
10°C
14°C
33%
38%
3.6 m/s
43
10
60
November
9°C
3°C
4°C
33%
40%
4.0 m/s
11
0
34
December
4°C
-1°C
-2°C
31%
50%
4.2 m/s
0
0
13
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 -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 -4°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 April and least likely around January. 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 2°CLow -2°CRain 31%
Winter in Decatur has typical daily highs of about 2°C and lows of about -2°C, with a 31% chance of rain on a given day.
Decatur weather in springMarch to May
High 15°CLow 8°CRain 36%
Spring in Decatur has typical daily highs of about 15°C and lows of about 8°C, with a 36% chance of rain on a given day.
Decatur weather in summerJune to August
High 27°CLow 20°CRain 34%
Summer in Decatur has typical daily highs of about 27°C and lows of about 20°C, with a 34% chance of rain on a given day.
Decatur weather in autumnSeptember to November
High 17°CLow 9°CRain 33%
Autumn in Decatur has typical daily highs of about 17°C and lows of about 9°C, with a 33% 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 31% in January, the driest month, to 37% in April, the wettest.
What time of year is Decatur windiest?
Winds in Decatur are highest in March, averaging 4.8 m/s (17 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 Decatur year round?
The average temperature in Decatur 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 -4°C.