In December, Johnson City typically sees daytime highs of 9.5°C and overnight lows around -2.3°C. Compared to the annual average high of 19.7°C, December runs -10.2°C.
December in Johnson City averages a daytime high of 9.5°C and an overnight low of -2.3°C.
December runs -10.2°C compared to Johnson City's annual average high of 19.7°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 9.5°C and cooler evenings around -2.3°C.