Snowfall for California mountains

Caltrans (California Department of Transportation) required chains on State Route 18, from Heaps Peak Dump to Big Bear Dam. 

7 May 2017 —  An unusual spring storm delivered a blast of winter to many parts of the Southland overnight, including snow at higher elevation areas.

In the San Gabriel and Tehachapi mountains,temperatures flirted with freezing and several inches of snow fell in the San Bernardino Mountain area of Lake Arrowhead.

Thanks to Jack Hydrazine for this link