The climate in 91765 Diamond Bar, CA is generally mild with relatively warm summers and cool winters. The average temperature throughout the year is around 68 degrees Fahrenheit (20 degrees Celsius). During the summer months, temperatures reach highs of around 90°F (32°C) while during the winter months, temperatures rarely drop below 40°F (4°C). Rainfall is moderate throughout the year, with an average total of about 18 inches per year. The area also experiences a fair amount of sunshine each year, making it a great place to enjoy outdoor activities all year round.
Diamond Bar (zip 91765), California gets 19 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Diamond Bar (zip 91765) averages 0 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 281 sunny days per year in Diamond Bar (zip 91765). The US average is 205 sunny days.
Diamond Bar (zip 91765) gets some kind of precipitation, on average, 32 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 91 degrees
Winter Low: the January low is 42
Rain: averages 19 inches of rain a year
Snow: averages 0 inches of snow a year