Heat in North Bay Interior Valleys, California

The Calistoga station reported a monthly record high of 94.

An unusually extreme, early-season heat wave impacted central California during the middle of March, setting several monthly heat records across the region. Radiosonde observations from Oakland reported a monthly record for highest 850 mb temperature at 23.4 degrees Celsius, or around 74.1 degrees Fahrenheit. Notably, this temperature would also break the monthly record for April, had it occurred during that month. Given the extreme and unusual levels of heat for this time of year, a Heat Advisory was issued from Monday, March 16 through Friday, March 20, throughout the Bay Area and northern Central Coast.