Wrong. It snows in the Sierra Nevada all year around. i.e some places/regions (i.e. snow caps/highest elevations, further north in latitude) tend to have persistent snowfall throughout summer. And some towns like Truckee CA typically have much cooler climate (summers averaging under 80 C. Temperature at nights can drop below freezing. And snow can last as long as into May at the start of summer.
I know. I'm from Truckee which is in NorCal (Northern California).
maybe because night city is in California. Del Coronado Bay to be exact where san Francisco
last snow fall there February 14, 2008 but didnt accumilate on ground December 13, 1967 was the last time snow accumulated on ground there