Average change in
Temperature
Average change in high temperature day-to-day
Last Month:
6.1°
Last Year:
6.1°
Average change in low temperature day-to-day
Last Month:
8.6°
Last Year:
8.1°
Average change in
Precipitation
Chance of dry day after a precip day
Last Month:
33%
Last Year:
56%
Chance of precip day after a dry day
Last Month:
30%
Last Year:
19%
ForecastAdvisor Fact
35.6% of OpenWeather's low temperature forecasts for O Fallon were within 3 degrees of actual temperatures last month.