In December, McKinney typically sees daytime highs of 14.3°C and overnight lows around 2.2°C. Compared to the annual average high of 24.4°C, December runs -10.2°C.
December in McKinney averages a daytime high of 14.3°C and an overnight low of 2.2°C.
December runs -10.2°C compared to McKinney's annual average high of 24.4°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 14.3°C and cooler evenings around 2.2°C.