ClimateAverages

Castlereagh Weather in December

JanFebMarAprMayJunJulAugSepOctNovDec
December daytime high
7.0°C
December overnight low
3.0°C
December average
5.2°C

In December, Castlereagh typically sees daytime highs of 7.0°C and overnight lows around 3.0°C. Compared to the annual average high of 12.0°C, December runs -4.9°C.

vs. annual avg high
-4.9°C
Rank among 12 months
#10 warmest
Hottest year overall
2025

Where December ranks in Castlereagh

JanFebMarAprMayJunJulAugSepOctNovDec7°

FAQ

What is the average temperature in Castlereagh in December?

December in Castlereagh averages a daytime high of 7.0°C and an overnight low of 3.0°C.

Is December warm or cold in Castlereagh?

December runs -4.9°C compared to Castlereagh's annual average high of 12.0°C, ranking #10 of 12 months by warmth.

What should I pack for Castlereagh in December?

Plan for daytime highs near 7.0°C and cooler evenings around 3.0°C.

Other months for Castlereagh

JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovember

December in nearby cities

BelfastDerryLisburnNewtownabbeyBangorCraigavon