Hefei vs O'Fallon, Illinois Climate
67%matchHefei and O'Fallon are a 67% climate match. Compared with Hefei, O'Fallon has 9°F (5°C) colder winter nights and less rain in summer.
Hefei gets 42 in (1057 mm) of rain a year and O'Fallon 40 in (1027 mm). July is the warmest month in both, with highs of 91°F (33°C) in Hefei 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)
HefeiO'Fallonsolid = high, dashed = low
Rain (in per month)
HefeiO'Fallon
Monthly averages
| Month | High | Low | Rain | |||
|---|---|---|---|---|---|---|
| Hefei | O'Fallon | Hefei | O'Fallon | Hefei | O'Fallon | |
| Jan | 45°F(7°C) | 39°F(4°C) | 32°F(0°C) | 23°F(-5°C) | 1.7 in(42 mm) | 2.4 in(60 mm) |
| Feb | 51°F(10°C) | 45°F(7°C) | 36°F(2°C) | 26°F(-3°C) | 1.9 in(48 mm) | 2.4 in(61 mm) |
| Mar | 60°F(16°C) | 56°F(13°C) | 44°F(7°C) | 35°F(2°C) | 2.8 in(71 mm) | 3.3 in(84 mm) |
| Apr | 72°F(22°C) | 67°F(20°C) | 54°F(12°C) | 45°F(7°C) | 3.5 in(90 mm) | 4.0 in(101 mm) |
| May | 81°F(27°C) | 77°F(25°C) | 64°F(18°C) | 56°F(13°C) | 3.6 in(92 mm) | 4.9 in(124 mm) |
| Jun | 86°F(30°C) | 85°F(30°C) | 71°F(22°C) | 65°F(18°C) | 6.3 in(159 mm) | 4.2 in(106 mm) |
| Jul | 91°F(33°C) | 88°F(31°C) | 78°F(25°C) | 68°F(20°C) | 6.5 in(164 mm) | 3.8 in(96 mm) |
| Aug | 90°F(32°C) | 87°F(31°C) | 76°F(25°C) | 66°F(19°C) | 6.0 in(152 mm) | 3.3 in(83 mm) |
| Sep | 83°F(28°C) | 81°F(27°C) | 68°F(20°C) | 58°F(14°C) | 3.4 in(86 mm) | 3.7 in(94 mm) |
| Oct | 73°F(23°C) | 69°F(21°C) | 57°F(14°C) | 46°F(8°C) | 2.3 in(59 mm) | 2.8 in(72 mm) |
| Nov | 61°F(16°C) | 55°F(13°C) | 45°F(7°C) | 36°F(2°C) | 2.3 in(58 mm) | 3.0 in(77 mm) |
| Dec | 50°F(10°C) | 44°F(7°C) | 34°F(1°C) | 27°F(-3°C) | 1.4 in(36 mm) | 2.7 in(69 mm) |
1991–2020 averages, by calendar month.