In December, Saint-Hyacinthe typically sees daytime highs of -3.0°C and overnight lows around -11.6°C. Compared to the annual average high of 10.8°C, December runs -13.8°C.
December in Saint-Hyacinthe averages a daytime high of -3.0°C and an overnight low of -11.6°C.
December runs -13.8°C compared to Saint-Hyacinthe's annual average high of 10.8°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near -3.0°C and cooler evenings around -11.6°C.