December in Calumpit averages a daily high of 30.7°C with nights around 22.1°C. Expect roughly 11.8 wet days totalling 128mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Calumpit is January–February.
Based on SCIENCE GARDEN, RP (41.5km), 1995–2024. 24 years of December data.