In December, Horsham typically sees daytime highs of 7.5°C and overnight lows around 1.6°C. Compared to the annual average high of 13.7°C, December runs -6.1°C.
December in Horsham averages a daytime high of 7.5°C and an overnight low of 1.6°C.
December runs -6.1°C compared to Horsham's annual average high of 13.7°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 7.5°C and cooler evenings around 1.6°C.