In December, Siedlce typically sees daytime highs of 0.7°C and overnight lows around -4.3°C. Compared to the annual average high of 11.5°C, December runs -10.8°C.
December in Siedlce averages a daytime high of 0.7°C and an overnight low of -4.3°C.
December runs -10.8°C compared to Siedlce's annual average high of 11.5°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 0.7°C and cooler evenings around -4.3°C.