In December, Portsmouth Heights typically sees daytime highs of 11.1°C and overnight lows around 0.7°C. Compared to the annual average high of 20.6°C, December runs -9.5°C.
December in Portsmouth Heights averages a daytime high of 11.1°C and an overnight low of 0.7°C.
December runs -9.5°C compared to Portsmouth Heights's annual average high of 20.6°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 11.1°C and cooler evenings around 0.7°C.