In December, Trieste typically sees daytime highs of 6.8°C and overnight lows around 0.1°C. Compared to the annual average high of 15.7°C, December runs -8.9°C.
December in Trieste averages a daytime high of 6.8°C and an overnight low of 0.1°C.
December runs -8.9°C compared to Trieste's annual average high of 15.7°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 6.8°C and cooler evenings around 0.1°C.