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Decatur weather by month
Check out Decatur weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.
Temperature in Decatur (°C)
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Max temperature (daytime) | 1 |
4 |
11 |
18 |
24 |
29 |
31 |
29 |
26 |
20 |
11 |
3 |
Min temperature (night-time) | -9 |
-7 |
-1 |
5 |
11 |
16 |
18 |
17 |
13 |
6 |
1 |
-6 |
Heat & Humidity | 0 |
0 |
0 |
0 |
0 |
M |
H |
M |
L |
0 |
0 |
0 |
Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme
Sunshine & Daylight in Decatur
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Daily hours of sunshine | ||||||||||||
Daily hours of daylight | 10 |
11 |
12 |
13 |
14 |
15 |
15 |
14 |
12 |
11 |
10 |
9 |
UV Index (Maximum) | 2 |
3 |
4 |
6 |
8 |
9 |
9 |
8 |
6 |
4 |
2 |
2 |
Rainfall in Decatur
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Number of days with some rain | 10 |
9 |
12 |
12 |
10 |
9 |
9 |
8 |
8 |
8 |
10 |
11 |
Average monthly rainfall (mm) | 49 |
48 |
80 |
96 |
102 |
100 |
107 |
93 |
81 |
70 |
77 |
72 |
More about Decatur
Decatur by month
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Recommended for Illinois
The climate guide for Illinois (Decatur) shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
What's the climate like in Decatur?
Decatur has a cold climate with hot summers and some rainfall in all months.
Metric (°C / mm) | Imperial (°F / inches)
Tropical storm risk: Decatur, Illinois hurricane season
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Compare Decatur with the UK
Below the Decatur chart shows average maximum daytime temperature for Decatur, Illinois, USA and the UK (London).
Maximum daytime temperature (°C)
Metric (°C / mm) | Imperial (°F / inches)
Compare more Decatur weather >>
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