Whittier's winters are mild, with temperatures often fluctuating between freezing and moderate levels, averaging around 12°C in January and December. Spring brings a gradual warming trend, with April and May temperatures rising to averages of 17°C and 19°C respectively. Summer months, June to August, experience the warmest temperatures, peaking at an average of 27°C in July. Autumn sees a cooling trend, with September averaging around 24°C before dropping back down to 18°C by October.