Mission Viejo's climate is mild, with temperatures rarely dropping below 0°C or rising above 40°C. Winters are cool and relatively consistent, with average temperatures ranging from 12-14°C throughout the months of December, January, and February. As spring approaches in March and April, temperatures gradually rise, reaching averages of 13-17°C. Summer months, June to August, bring warmer days with averages around 25-27°C, while autumn brings a slight cooling trend, returning to cooler averages by November.