Everything below is collected in one spot so you do not have to cross-check Indianapolis climate: monthly averages by hand. The gap between Jan and Jul is 26.5 C here: -3.1 C against 23.4 C. No month dominates: the wettest is Jun at 4.48 mm/day, the driest Feb at 2.40 mm/day. Taken together that is roughly 1,139 mm of rain a year for the grid cell. Because each page is rebuilt independently, one unavailable upstream never takes the rest of the site down. The table underneath carries the per-month breakdown; the related pages cover the same dataset nearby.
Annual mean temperature 11.0 C
Warmest month Jul (23.4 C)
Coldest month Jan (-3.1 C)
Wettest month Jun (4.48 mm/day)
All-time record high 40.3 C
All-time record low -28.0 C
Annual precipitation 1,139 mm / year
Coordinates 39.76838, -86.15804
Population 887,642
Average monthly temperature and rainfall in Indianapolis
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
-3.1
2.42
18.2
-28.0
Feb
-1.6
2.40
21.5
-26.1
Mar
4.4
2.85
26.8
-16.3
Apr
11.0
3.70
27.2
-6.0
May
16.8
3.83
32.3
-3.9
Jun
21.6
4.48
39.9
3.2
Jul
23.4
3.61
40.3
8.2
Aug
22.7
3.07
36.8
8.2
Sep
19.2
2.71
36.2
2.4
Oct
12.1
2.99
32.6
-4.0
Nov
5.1
2.74
24.9
-12.5
Dec
-0.5
2.67
20.9
-20.8
What the Indianapolis climate table shows
Values are multi-decadal climatological averages for the 39.76838, -86.15804 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
Does Indianapolis get the same every year?
Close to it. Averaging decades smooths variation, so treat these as typical rather than guaranteed.