In December, Saint John typically sees daytime highs of -0.1°C and overnight lows around -9.0°C. Compared to the annual average high of 10.4°C, December runs -10.4°C.
December in Saint John averages a daytime high of -0.1°C and an overnight low of -9.0°C.
December runs -10.4°C compared to Saint John's annual average high of 10.4°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near -0.1°C and cooler evenings around -9.0°C.