About Lightning in California
California averages 15 thunderstorm days per year, placing it below the national average of 25 days. Located at approximately 39°N latitude, California is the most populous US state, where coastal marine layers suppress thunderstorms along the coast, but the Sierra Nevada and desert regions experience monsoon-driven lightning storms that pose significant wildfire risk.
In California, maritime influences generally suppress thunderstorm formation, with activity concentrated over mountain terrain or during rare atmospheric setups. Peak thunderstorm activity occurs during July through September, when conditions align for the most frequent lightning strikes. With a population of 39.5 million residents, storm awareness and lightning safety are important considerations for anyone living in or visiting California.