According to the Western Region Climate Center’s California Climate Tracker, the monthly average temperature was 46.9°F which is 1.0°F lower than the long-term average of 47.9°F. With a statewide average of 6.41 inches, precipitation for March was 205% of the long term average.his is normally not an issue in the winter. The 8-Station Index for northern California precipitation recorded 18.5 inches in March with 18 days showing precipitation. On average, 6.9 inches of precipitation is recorded for the 8-Station index in March.