In December, Terni typically sees daytime highs of 9.1°C and overnight lows around 1.6°C. Compared to the annual average high of 18.4°C, December runs -9.3°C.
December in Terni averages a daytime high of 9.1°C and an overnight low of 1.6°C.
December runs -9.3°C compared to Terni's annual average high of 18.4°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 9.1°C and cooler evenings around 1.6°C.