In December, Bletchley typically sees daytime highs of 6.7°C and overnight lows around 1.8°C. Compared to the annual average high of 12.9°C, December runs -6.2°C.
December in Bletchley averages a daytime high of 6.7°C and an overnight low of 1.8°C.
December runs -6.2°C compared to Bletchley's annual average high of 12.9°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 6.7°C and cooler evenings around 1.8°C.