December in South Hill averages a daily high of 7.1°C with nights around 0.8°C. Expect roughly 20.3 wet days totalling 162.2mm. A hard month to visit for comfort alone.
Across the year, the best time to visit South Hill is July–September.
Based on MCMILLIN RESERVOIR, WA US (1.2km), 1995–2024. 18 years of December data.