In December, Port Arthur typically sees daytime highs of 17.0°C and overnight lows around 7.8°C. Compared to the annual average high of 24.3°C, December runs -7.3°C.
December in Port Arthur averages a daytime high of 17.0°C and an overnight low of 7.8°C.
December runs -7.3°C compared to Port Arthur's annual average high of 24.3°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 17.0°C and cooler evenings around 7.8°C.