Decatur, IN Weather & Climate Normals
What a normal year in Decatur actually looks like
On the 30-year record NOAA keeps for Decatur, IN, the comfort score comes out to 46/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much Decatur's weather actually swings
Average temperatures in Decatur run from 26°F in Jan up to 73°F in Jul, a 47.6°F seasonal swing, one of the widest gaps in this dataset.
Decatur, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 33°F | 18°F | 2.51in | 9.2in |
| Feb | 36°F | 20°F | 2.07in | 7.5in |
| Mar | 48°F | 29°F | 2.75in | 4.2in |
| Apr | 61°F | 39°F | 4.08in | 0.5in |
| May | 72°F | 50°F | 4.75in | 0in |
| Jun | 81°F | 60°F | 4.58in | 0in |
| Jul | 84°F | 63°F | 4.26in | 0in |
| Aug | 82°F | 61°F | 4.04in | 0in |
| Sep | 77°F | 53°F | 3.04in | 0in |
| Oct | 64°F | 42°F | 2.91in | 0in |
| Nov | 50°F | 33°F | 3.04in | 1.2in |
| Dec | 38°F | 24°F | 2.59in | 5.5in |
If you're timing a visit, May, Jun, Jul, Aug, and Sep are Decatur's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
How wet Decatur actually gets
Over a typical year, Decatur sees about 40.62in of precipitation a year across roughly 127 days with measurable rain or snow, with 28.1in of snow a year.
Decatur against the rest of the country
Out of 4876 cities scored here, Decatur comes in at 3102; within IN alone it ranks 76 of 126. Population is about 10,072.
Checking the actual forecast
These figures come from Decatur 1 N, IN US, the NOAA station 1.3 miles from Decatur, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why this uses the nearest NOAA station · How the comfort score is calculated