In November, O'Fallon typically sees daytime highs of 12.8°C and overnight lows around 1.1°C. Compared to the annual average high of 18.9°C, November runs -6.1°C.
November in O'Fallon averages a daytime high of 12.8°C and an overnight low of 1.1°C.
November runs -6.1°C compared to O'Fallon's annual average high of 18.9°C, ranking #8 of 12 months by warmth.
Plan for daytime highs near 12.8°C and cooler evenings around 1.1°C.