In December, Waterloo typically sees daytime highs of -0.1°C and overnight lows around -9.6°C. Compared to the annual average high of 14.4°C, December runs -14.5°C.
December in Waterloo averages a daytime high of -0.1°C and an overnight low of -9.6°C.
December runs -14.5°C compared to Waterloo's annual average high of 14.4°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near -0.1°C and cooler evenings around -9.6°C.