In January, Folsom typically sees daytime highs of 12.3°C and overnight lows around 2.8°C. Compared to the annual average high of 23.3°C, January runs -11.1°C.
January in Folsom averages a daytime high of 12.3°C and an overnight low of 2.8°C.
January runs -11.1°C compared to Folsom's annual average high of 23.3°C, ranking #12 of 12 months by warmth.
Plan for daytime highs near 12.3°C and cooler evenings around 2.8°C.