Chino Hills experiences mild winters, with temperatures ranging from around 2-30°C in January and December, allowing for outdoor activities. Spring brings warmer days, with April being the warmest month, averaging 17°C, while May is similar but slightly cooler. Summer months, June to August, are characterized by hot temperatures, peaking at 37°C in July and August, with a moderate drop in September. Autumn brings relief from the heat, with October being relatively cool, averaging around 19°C.