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
🌦Humid
| Score | 12 | 24 | 43 | 74 | 74 | 65 | 46 | 66 | 88 | 81 | 52 | 25 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Climate | Cold | Cold | Cold | Cool & rainy | Humid | Humid | Hot & rainy | Humid | Pleasant | Mild | Cold | Cold |
| Temperature | -3–6°C | -3–9°C | 4–15°C | 8–20°C | 14–24°C | 19–31°C | 21–31°C | 21–30°C | 17–27°C | 11–21°C | 5–14°C | 0–9°C |
| Feels like | -7–2°C | -7–5°C | 1–13°C | 5–18°C | 13–25°C | 20–33°C | 24–35°C | 23–33°C | 17–28°C | 8–19°C | 1–11°C | -4–6°C |
| Precipitation | 85mm 10 days | 62mm 8 days | 141mm 10 days | 124mm 9 days | 125mm 11 days | 117mm 8 days | 182mm 11 days | 137mm 8 days | 61mm 5 days | 91mm 8 days | 78mm 5 days | 59mm 7 days |
| Sunshine | 5.0h ☀︎ 51% | 7.5h ☀︎ 70% | 7.5h ☀︎ 63% | 9.3h ☀︎ 71% | 9.6h ☀︎ 67% | 11.7h ☀︎ 79% | 11.5h ☀︎ 79% | 11.0h ☀︎ 81% | 10.2h ☀︎ 82% | 8.4h ☀︎ 75% | 7.7h ☀︎ 76% | 5.9h ☀︎ 63% |
| Wind | W · 18 km/h | W · 19 km/h | SW · 20 km/h | SW · 21 km/h | SE · 18 km/h | S · 16 km/h | S · 14 km/h | S · 13 km/h | SE · 14 km/h | SW · 18 km/h | SW · 18 km/h | SW · 18 km/h |
| Humidity (%) | 71% | 65% | 66% | 63% | 70% | 66% | 74% | 74% | 70% | 66% | 66% | 71% |
| Day length | 9.8h | 10.8h | 12.0h | 13.2h | 14.3h | 14.8h | 14.6h | 13.6h | 12.4h | 11.2h | 10.1h | 9.5h |
State of Missouri · United States of America
State of Missouri · United States of America
State of Missouri · United States of America