In December, Longueuil typically sees daytime highs of -3.2°C and overnight lows around -11.6°C. Compared to the annual average high of 10.8°C, December runs -14.0°C.
December in Longueuil averages a daytime high of -3.2°C and an overnight low of -11.6°C.
December runs -14.0°C compared to Longueuil's annual average high of 10.8°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near -3.2°C and cooler evenings around -11.6°C.