The climate in 91001 Altadena, CA is generally mild throughout the year. Summers are hot and dry, while winters tend to be more mild and wet. In the summertime, temperatures average in the 80s and 90s, while during the winter temperatures usually stay between 40°F and 60°F. The area receives an average of 18 inches of rain each year, which mostly falls during the months of December through March. Although it can get quite hot in the summer time, Altadena’s mild climate makes it a great place to live all year round.
Altadena (zip 91001), California gets 23 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Altadena (zip 91001) averages 0 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 291 sunny days per year in Altadena (zip 91001). The US average is 205 sunny days.
Altadena (zip 91001) gets some kind of precipitation, on average, 37 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 86 degrees
Winter Low: the January low is 47
Rain: averages 23 inches of rain a year
Snow: averages 0 inches of snow a year