December in New Westminster averages a daily high of 5.5°C with nights around 0.6°C. Expect roughly 20.3 wet days totalling 254mm. A hard month to visit for comfort alone.
Across the year, the best time to visit New Westminster is July–August.
Based on BURNABY SIMON FRASER U, BC CA (8.5km), 1995–2024. 13 years of December data.