The climate in 91789 Walnut, CA is generally a mild one with warm summers and cool winters. Average summer temperatures range from the mid 70s to the upper 80s while winter temperatures typically stay in the upper 30s to the low 50s. Rainfall is moderate throughout the year, with occasional showers between June and October. The area has an average of 333 sunny days per year, making it a pleasant place to live throughout most of the year.
Walnut (zip 91789), California gets 16 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Walnut (zip 91789) averages 0 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 280 sunny days per year in Walnut (zip 91789). The US average is 205 sunny days.
Walnut (zip 91789) gets some kind of precipitation, on average, 33 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 88 degrees
Winter Low: the January low is 44
Rain: averages 16 inches of rain a year
Snow: averages 0 inches of snow a year