Champaign Climate by Month
Champaign, Illinois, United States
Hot summers and freezing winters, with rain spread through the year.
Champaign has hot summers and freezing winters, with rain spread through the year. July is the warmest month, with highs around 86°F (30°C); January is the coolest at 35°F (2°C), and nights dip to 20°F (-7°C). About 41 in (1047 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 86°F(30°C)
- Average high, July
- Coldest nights
- 20°F(-7°C)
- Average low, January
- Rain per year
- 41 in(1047 mm)
- No clear rainy season
- Humidity
- 75%
- Sunniest: July
Best and worst months in Champaign
Best for weatherThe most comfortable weather comes in May and September, with highs around 77°F (25°C) and about 4.1 in (105 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 35°F (2°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 May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Champaign weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 35°F(2°C) | 20°F(-7°C) | 2.1 in(54 mm) | 99% | 1.5 |
| FebFebruary | 39°F(4°C) | 22°F(-5°C) | 2.0 in(50 mm) | 86% | 2.6 |
| MarMarch | 51°F(11°C) | 32°F(0°C) | 3.0 in(76 mm) | 77% | 3.7 |
| AprApril | 64°F(18°C) | 42°F(6°C) | 4.1 in(103 mm) | 65% | 4.5 |
| MayMayBest | 75°F(24°C) | 53°F(12°C) | 4.8 in(121 mm) | 69% | 5.2 |
| JunJune | 84°F(29°C) | 63°F(17°C) | 4.6 in(117 mm) | 68% | 5.9 |
| JulJuly | 86°F(30°C) | 66°F(19°C) | 4.8 in(122 mm) | 72% | 6.0 |
| AugAugust | 85°F(30°C) | 64°F(18°C) | 3.6 in(92 mm) | 72% | 5.3 |
| SepSeptemberBest | 80°F(27°C) | 56°F(13°C) | 3.5 in(88 mm) | 65% | 4.5 |
| OctOctober | 67°F(19°C) | 45°F(7°C) | 3.0 in(76 mm) | 66% | 3.0 |
| NovNovember | 52°F(11°C) | 34°F(1°C) | 3.1 in(79 mm) | 75% | 1.9 |
| DecDecember | 40°F(4°C) | 25°F(-4°C) | 2.7 in(69 mm) | 81% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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