Jefferson City vs Alton, Illinois Climate
99%matchOn climate, Alton is a 99% match for Jefferson City. Very close: temperatures within 2°F (1°C), with similar rain, humidity and sun.
Jefferson City gets 40 in (1014 mm) of rain a year and Alton 40 in (1018 mm). July is the warmest month in both, with highs of 90°F (32°C) in Jefferson City and 88°F (31°C) in Alton.
Climate fingerprints: ring color = average temperature, thickness = rain. January at the top.
Month by month
Highs and lows (°F)
Jefferson CityAltonsolid = high, dashed = low
Rain (in per month)
Jefferson CityAlton
Monthly averages
| Month | High | Low | Rain | |||
|---|---|---|---|---|---|---|
| Jefferson City | Alton | Jefferson City | Alton | Jefferson City | Alton | |
| Jan | 41°F(5°C) | 39°F(4°C) | 22°F(-6°C) | 21°F(-6°C) | 1.7 in(44 mm) | 2.1 in(54 mm) |
| Feb | 47°F(8°C) | 44°F(7°C) | 26°F(-4°C) | 25°F(-4°C) | 2.0 in(50 mm) | 2.1 in(54 mm) |
| Mar | 58°F(14°C) | 55°F(13°C) | 35°F(2°C) | 34°F(1°C) | 3.0 in(77 mm) | 3.2 in(82 mm) |
| Apr | 69°F(20°C) | 67°F(19°C) | 45°F(7°C) | 45°F(7°C) | 4.2 in(107 mm) | 3.9 in(99 mm) |
| May | 78°F(25°C) | 76°F(25°C) | 55°F(13°C) | 55°F(13°C) | 5.2 in(133 mm) | 4.8 in(121 mm) |
| Jun | 86°F(30°C) | 84°F(29°C) | 64°F(18°C) | 64°F(18°C) | 4.1 in(103 mm) | 4.0 in(101 mm) |
| Jul | 90°F(32°C) | 88°F(31°C) | 68°F(20°C) | 67°F(20°C) | 4.0 in(101 mm) | 4.1 in(103 mm) |
| Aug | 89°F(32°C) | 87°F(30°C) | 66°F(19°C) | 65°F(19°C) | 3.3 in(84 mm) | 3.4 in(86 mm) |
| Sep | 82°F(28°C) | 80°F(27°C) | 57°F(14°C) | 57°F(14°C) | 3.9 in(99 mm) | 3.6 in(92 mm) |
| Oct | 70°F(21°C) | 69°F(20°C) | 46°F(8°C) | 46°F(8°C) | 3.1 in(78 mm) | 2.9 in(74 mm) |
| Nov | 56°F(13°C) | 55°F(13°C) | 35°F(2°C) | 35°F(2°C) | 3.1 in(79 mm) | 3.3 in(83 mm) |
| Dec | 45°F(7°C) | 43°F(6°C) | 26°F(-4°C) | 26°F(-3°C) | 2.3 in(59 mm) | 2.7 in(69 mm) |
1991–2020 averages, by calendar month.