Normal Climate by Month
Normal, Illinois, United States
Warm summers and freezing winters, with rain spread through the year.
The climate in Normal is one of warm 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 34°F (1°C), and nights dip to 18°F (-8°C). About 38 in (969 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 86°F(30°C)
- Average high, July
- Coldest nights
- 18°F(-8°C)
- Average low, January
- Rain per year
- 38 in(969 mm)
- No clear rainy season
- Humidity
- 71%
- Sunniest: July
Best and worst months in Normal
Best for weatherMay and September are the best time for weather in Normal: highs near 77°F (25°C) and about 4.1 in (104 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 34°F (1°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)
Normal weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 34°F(1°C) | 18°F(-8°C) | 1.9 in(47 mm) | 85% | 1.5 |
| FebFebruary | 39°F(4°C) | 21°F(-6°C) | 1.6 in(41 mm) | 71% | 2.6 |
| MarMarch | 51°F(10°C) | 31°F(-1°C) | 2.8 in(71 mm) | 69% | 3.7 |
| AprApril | 63°F(17°C) | 41°F(5°C) | 4.1 in(104 mm) | 60% | 4.5 |
| MayMayBest | 74°F(24°C) | 52°F(11°C) | 4.6 in(116 mm) | 66% | 5.2 |
| JunJune | 83°F(29°C) | 62°F(16°C) | 4.3 in(108 mm) | 66% | 5.9 |
| JulJuly | 86°F(30°C) | 65°F(18°C) | 4.3 in(108 mm) | 70% | 6.0 |
| AugAugust | 85°F(29°C) | 63°F(17°C) | 3.2 in(81 mm) | 70% | 5.3 |
| SepSeptemberBest | 79°F(26°C) | 55°F(13°C) | 3.6 in(92 mm) | 67% | 4.5 |
| OctOctober | 66°F(19°C) | 44°F(6°C) | 2.8 in(72 mm) | 68% | 3.0 |
| NovNovember | 51°F(10°C) | 33°F(0°C) | 2.6 in(65 mm) | 79% | 1.9 |
| DecDecember | 39°F(4°C) | 23°F(-5°C) | 2.5 in(64 mm) | 86% | 1.4 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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