Winters in Brea are generally mild, with temperatures ranging from 2-30°C, averaging around 14°C. The spring season brings gradual warming, with temperatures increasing to a high of 34°C in April and May, averaging around 17°C. Summer months, June to August, experience warm temperatures, averaging around 25°C, but rarely exceeding 37°C. Autumn is cooler than summer, with temperatures dropping back down to an average of 19°C by October. The coldest month is usually December, with temperatures ranging from 5-28°C, averaging around 12°C.