Alton, Illinois vs Carbondale Climate
97%matchAlton vs Carbondale: a 97% climate match. Compared with Alton, Carbondale has the same summer highs and more rain in winter.
Alton gets 40 in (1018 mm) of rain a year and Carbondale 46 in (1175 mm). July is the warmest month in both, with highs of 88°F (31°C) in Alton and 89°F (32°C) in Carbondale.
Climate fingerprints: ring color = average temperature, thickness = rain. January at the top.
Month by month
Highs and lows (°F)
AltonCarbondalesolid = high, dashed = low
Rain (in per month)
AltonCarbondale
Monthly averages
| Month | High | Low | Rain | |||
|---|---|---|---|---|---|---|
| Alton | Carbondale | Alton | Carbondale | Alton | Carbondale | |
| Jan | 39°F(4°C) | 42°F(6°C) | 21°F(-6°C) | 25°F(-4°C) | 2.1 in(54 mm) | 3.3 in(83 mm) |
| Feb | 44°F(7°C) | 47°F(9°C) | 25°F(-4°C) | 28°F(-2°C) | 2.1 in(54 mm) | 3.2 in(81 mm) |
| Mar | 55°F(13°C) | 57°F(14°C) | 34°F(1°C) | 37°F(3°C) | 3.2 in(82 mm) | 4.6 in(116 mm) |
| Apr | 67°F(19°C) | 69°F(20°C) | 45°F(7°C) | 47°F(8°C) | 3.9 in(99 mm) | 4.9 in(124 mm) |
| May | 76°F(25°C) | 77°F(25°C) | 55°F(13°C) | 57°F(14°C) | 4.8 in(121 mm) | 5.1 in(129 mm) |
| Jun | 84°F(29°C) | 86°F(30°C) | 64°F(18°C) | 65°F(19°C) | 4.0 in(101 mm) | 3.7 in(93 mm) |
| Jul | 88°F(31°C) | 89°F(32°C) | 67°F(20°C) | 69°F(21°C) | 4.1 in(103 mm) | 3.8 in(96 mm) |
| Aug | 87°F(30°C) | 88°F(31°C) | 65°F(19°C) | 66°F(19°C) | 3.4 in(86 mm) | 3.1 in(78 mm) |
| Sep | 80°F(27°C) | 82°F(28°C) | 57°F(14°C) | 58°F(15°C) | 3.6 in(92 mm) | 3.4 in(86 mm) |
| Oct | 69°F(20°C) | 71°F(22°C) | 46°F(8°C) | 47°F(8°C) | 2.9 in(74 mm) | 3.4 in(86 mm) |
| Nov | 55°F(13°C) | 57°F(14°C) | 35°F(2°C) | 37°F(3°C) | 3.3 in(83 mm) | 4.2 in(106 mm) |
| Dec | 43°F(6°C) | 46°F(8°C) | 26°F(-3°C) | 29°F(-2°C) | 2.7 in(69 mm) | 3.8 in(97 mm) |
1991–2020 averages, by calendar month.