The Central Valley is known for its temperate climate. Summer days can be quite hot. Daytime temperatures reach 92-98 F/33-37 C but drop to the 60s F/15-20 C at night. Winters are cool and can be foggy. Temperatures of 54-62 F/12-16 C can be expected, with lows in the upper 30s F/2-5 C at night.
In the nearby mountains, snow can be found at high elevations from November to March. Summer temperatures are in the 75-83 F/23-26 C range, but nights are chilly, even in summer.