Discover the best time of year, based on historical climate, temperature, and precipitation.
The best weather in O'Fallon is from April, September, October. — consistent weather climate
☀️Pleasant
| Score | 11 | 24 | 43 | 73 | 73 | 70 | 50 | 70 | 82 | 80 | 50 | 21 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Climate | Cold | Cold | Cold | Cool & rainy | Humid | Pleasant | Hot & rainy | Humid | Humid | Cool & rainy | Cold | Cold |
| Temperature | -3–5°C | -2–9°C | 4–15°C | 8–20°C | 14–25°C | 19–31°C | 21–31°C | 20–30°C | 17–27°C | 11–21°C | 4–14°C | 1–9°C |
| Feels like | -7–2°C | -7–5°C | 1–13°C | 5–18°C | 13–25°C | 20–33°C | 24–35°C | 22–33°C | 17–28°C | 9–19°C | 1–11°C | -4–6°C |
| Precipitation | 95mm 10 days | 68mm 8 days | 149mm 10 days | 130mm 9 days | 141mm 11 days | 76mm 8 days | 164mm 11 days | 109mm 8 days | 103mm 7 days | 101mm 8 days | 77mm 6 days | 79mm 8 days |
| Sunshine | 5.0h ☀︎ 51% | 7.5h ☀︎ 69% | 7.6h ☀︎ 63% | 9.3h ☀︎ 70% | 9.7h ☀︎ 68% | 11.7h ☀︎ 79% | 11.7h ☀︎ 80% | 11.1h ☀︎ 81% | 10.3h ☀︎ 83% | 8.6h ☀︎ 77% | 7.5h ☀︎ 74% | 5.7h ☀︎ 60% |
| Wind | W · 18 km/h | W · 19 km/h | S · 20 km/h | SW · 21 km/h | S · 18 km/h | S · 16 km/h | SW · 14 km/h | S · 14 km/h | SE · 14 km/h | SW · 18 km/h | SW · 18 km/h | SW · 18 km/h |
| Humidity (%) | 71% | 66% | 66% | 63% | 68% | 63% | 73% | 73% | 69% | 67% | 67% | 73% |
| Day length | 9.8h | 10.8h | 12.0h | 13.2h | 14.3h | 14.8h | 14.5h | 13.6h | 12.4h | 11.2h | 10.1h | 9.5h |
State of Illinois · United States of America
State of Illinois · United States of America
State of Illinois · United States of America