In December, McAllen typically sees daytime highs of 22.4°C and overnight lows around 10.0°C. Compared to the annual average high of 29.5°C, December runs -7.0°C.
December in McAllen averages a daytime high of 22.4°C and an overnight low of 10.0°C.
December runs -7.0°C compared to McAllen's annual average high of 29.5°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 22.4°C and cooler evenings around 10.0°C.