In December, Waterbury typically sees daytime highs of 2.8°C and overnight lows around -6.6°C. Compared to the annual average high of 14.6°C, December runs -11.8°C.
December in Waterbury averages a daytime high of 2.8°C and an overnight low of -6.6°C.
December runs -11.8°C compared to Waterbury's annual average high of 14.6°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 2.8°C and cooler evenings around -6.6°C.