Belvidere Climate by Month
Belvidere, Illinois, United States
Warm summers and freezing winters, with rain spread through the year.
Belvidere has warm summers and freezing winters, with rain spread through the year. July is the warmest month, with highs around 84°F (29°C); January is the coolest at 29°F (-1°C), and nights dip to 13°F (-10°C). About 37 in (940 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 84°F(29°C)
- Average high, July
- Coldest nights
- 13°F(-10°C)
- Average low, January
- Rain per year
- 37 in(940 mm)
- No clear rainy season
- Humidity
- 74%
- Sunniest: July
Best and worst months in Belvidere
Best for weatherThe most comfortable weather comes in September, with highs around 76°F (24°C) and about 3.9 in (100 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 29°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 September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Belvidere weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 29°F(-1°C) | 13°F(-10°C) | 1.5 in(38 mm) | 100% | 1.5 |
| FebFebruary | 34°F(1°C) | 17°F(-8°C) | 1.4 in(35 mm) | 85% | 2.5 |
| MarMarch | 46°F(8°C) | 27°F(-3°C) | 2.2 in(57 mm) | 68% | 3.6 |
| AprApril | 59°F(15°C) | 37°F(3°C) | 4.0 in(101 mm) | 61% | 4.5 |
| MayMay | 72°F(22°C) | 48°F(9°C) | 4.3 in(110 mm) | 63% | 5.2 |
| JunJune | 81°F(27°C) | 58°F(14°C) | 4.7 in(119 mm) | 69% | 5.8 |
| JulJuly | 84°F(29°C) | 62°F(17°C) | 3.8 in(97 mm) | 72% | 5.9 |
| AugAugust | 82°F(28°C) | 60°F(16°C) | 4.0 in(101 mm) | 74% | 5.2 |
| SepSeptemberBest | 76°F(24°C) | 52°F(11°C) | 3.9 in(100 mm) | 70% | 4.3 |
| OctOctober | 63°F(17°C) | 40°F(5°C) | 2.8 in(72 mm) | 69% | 2.7 |
| NovNovember | 47°F(8°C) | 29°F(-1°C) | 2.4 in(60 mm) | 76% | 1.7 |
| DecDecember | 34°F(1°C) | 19°F(-7°C) | 2.0 in(50 mm) | 82% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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