Columbus, Indiana vs O'Fallon, Illinois Climate
99%matchColumbus and O'Fallon are a 99% climate match. Very close: temperatures within 2°F (1°C), with similar rain, humidity and sun.
Columbus gets 43 in (1096 mm) of rain a year and O'Fallon 40 in (1027 mm). July is the warmest month in both, with highs of 86°F (30°C) in Columbus and 88°F (31°C) in O'Fallon.
Climate fingerprints: ring color = average temperature, thickness = rain. January at the top.
Month by month
Highs and lows (°F)
ColumbusO'Fallonsolid = high, dashed = low
Rain (in per month)
ColumbusO'Fallon
Monthly averages
| Month | High | Low | Rain | |||
|---|---|---|---|---|---|---|
| Columbus | O'Fallon | Columbus | O'Fallon | Columbus | O'Fallon | |
| Jan | 38°F(4°C) | 39°F(4°C) | 21°F(-6°C) | 23°F(-5°C) | 3.1 in(79 mm) | 2.4 in(60 mm) |
| Feb | 42°F(6°C) | 45°F(7°C) | 24°F(-5°C) | 26°F(-3°C) | 2.8 in(71 mm) | 2.4 in(61 mm) |
| Mar | 53°F(12°C) | 56°F(13°C) | 33°F(1°C) | 35°F(2°C) | 3.8 in(97 mm) | 3.3 in(84 mm) |
| Apr | 65°F(19°C) | 67°F(20°C) | 43°F(6°C) | 45°F(7°C) | 4.8 in(123 mm) | 4.0 in(101 mm) |
| May | 75°F(24°C) | 77°F(25°C) | 53°F(12°C) | 56°F(13°C) | 4.9 in(125 mm) | 4.9 in(124 mm) |
| Jun | 83°F(28°C) | 85°F(30°C) | 62°F(17°C) | 65°F(18°C) | 3.6 in(92 mm) | 4.2 in(106 mm) |
| Jul | 86°F(30°C) | 88°F(31°C) | 65°F(18°C) | 68°F(20°C) | 3.8 in(97 mm) | 3.8 in(96 mm) |
| Aug | 85°F(30°C) | 87°F(31°C) | 63°F(17°C) | 66°F(19°C) | 3.4 in(87 mm) | 3.3 in(83 mm) |
| Sep | 80°F(27°C) | 81°F(27°C) | 56°F(13°C) | 58°F(14°C) | 3.0 in(75 mm) | 3.7 in(94 mm) |
| Oct | 68°F(20°C) | 69°F(21°C) | 44°F(7°C) | 46°F(8°C) | 2.9 in(74 mm) | 2.8 in(72 mm) |
| Nov | 54°F(12°C) | 55°F(13°C) | 34°F(1°C) | 36°F(2°C) | 3.5 in(90 mm) | 3.0 in(77 mm) |
| Dec | 43°F(6°C) | 44°F(7°C) | 26°F(-3°C) | 27°F(-3°C) | 3.4 in(86 mm) | 2.7 in(69 mm) |
1991–2020 averages, by calendar month.