In December, Lahti typically sees daytime highs of -2.6°C and overnight lows around -8.4°C. Compared to the annual average high of 7.8°C, December runs -10.4°C.
December in Lahti averages a daytime high of -2.6°C and an overnight low of -8.4°C.
December runs -10.4°C compared to Lahti's annual average high of 7.8°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near -2.6°C and cooler evenings around -8.4°C.