In December, Ellicott City typically sees daytime highs of 6.3°C and overnight lows around -3.1°C. Compared to the annual average high of 17.8°C, December runs -11.5°C.
December in Ellicott City averages a daytime high of 6.3°C and an overnight low of -3.1°C.
December runs -11.5°C compared to Ellicott City's annual average high of 17.8°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 6.3°C and cooler evenings around -3.1°C.