In December, Oshawa typically sees daytime highs of 0.6°C and overnight lows around -6.8°C. Compared to the annual average high of 11.9°C, December runs -11.3°C.
December in Oshawa averages a daytime high of 0.6°C and an overnight low of -6.8°C.
December runs -11.3°C compared to Oshawa's annual average high of 11.9°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 0.6°C and cooler evenings around -6.8°C.