In December, Port Saint Mary typically sees daytime highs of 8.3°C and overnight lows around 4.5°C. Compared to the annual average high of 11.6°C, December runs -3.2°C.
December in Port Saint Mary averages a daytime high of 8.3°C and an overnight low of 4.5°C.
December runs -3.2°C compared to Port Saint Mary's annual average high of 11.6°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 8.3°C and cooler evenings around 4.5°C.