Carbondale Climate by Month
Carbondale, Illinois, United States
Hot summers and cold winters, with rain spread through the year.
The climate in Carbondale is one of hot summers and cold winters, with rain spread through the year. Afternoon highs range from 42°F (6°C) in January to 89°F (32°C) in July, and January nights average 25°F (-4°C). It gets 46 in (1175 mm) of rain a year, spread across the months.
- Warmest month
- 89°F(32°C)
- Average high, July
- Coldest nights
- 25°F(-4°C)
- Average low, January
- Rain per year
- 46 in(1175 mm)
- No clear rainy season
- Humidity
- 69%
- Sunniest: June
Best and worst months in Carbondale
Best for weatherThe most comfortable weather comes in May and October, with highs around 74°F (23°C) and about 4.2 in (108 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 42°F (6°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in October.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Carbondale weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 42°F(6°C) | 25°F(-4°C) | 3.3 in(83 mm) | 76% | 1.8 |
| FebFebruary | 47°F(9°C) | 28°F(-2°C) | 3.2 in(81 mm) | 65% | 2.7 |
| MarMarch | 57°F(14°C) | 37°F(3°C) | 4.6 in(116 mm) | 64% | 3.8 |
| AprApril | 69°F(20°C) | 47°F(8°C) | 4.9 in(124 mm) | 62% | 4.8 |
| MayMayBest | 77°F(25°C) | 57°F(14°C) | 5.1 in(129 mm) | 71% | 5.5 |
| JunJune | 86°F(30°C) | 65°F(19°C) | 3.7 in(93 mm) | 69% | 6.2 |
| JulJuly | 89°F(32°C) | 69°F(21°C) | 3.8 in(96 mm) | 71% | 6.1 |
| AugAugust | 88°F(31°C) | 66°F(19°C) | 3.1 in(78 mm) | 69% | 5.7 |
| SepSeptember | 82°F(28°C) | 58°F(15°C) | 3.4 in(86 mm) | 67% | 4.7 |
| OctOctoberBest | 71°F(22°C) | 47°F(8°C) | 3.4 in(86 mm) | 65% | 3.4 |
| NovNovember | 57°F(14°C) | 37°F(3°C) | 4.2 in(106 mm) | 73% | 2.2 |
| DecDecember | 46°F(8°C) | 29°F(-2°C) | 3.8 in(97 mm) | 79% | 1.6 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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