Barometric Pressure Forecast for Fullerton, California
Barometric pressure forecast for Fullerton, California — at the foot of the Coyote Hills in north Orange County, below the Puente and Chino ranges. See current barometric pressure and what it means for weather-sensitive people.
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Pressure and weather in Fullerton
Fullerton sits where the coastal plain of northern Orange County runs up against the low rounded ridges of the Coyote and Puente Hills, far enough inland that the morning marine layer usually burns off earlier than at the beach and the summer afternoons run several degrees warmer. The winter half of the year is when almost all the weather happens, and it is dominated by two things. Atmospheric rivers reaching the southern California coast between December and March deliver the bulk of the annual rain in a handful of long-duration events, each with a sustained pressure decline over a day or more. Cut-off lows drifting slowly down the coast in spring can produce unsettled weather for several days with an unusually flat and low barometer. From September into winter, offshore flow through the Santa Ana and Chino canyons brings hot dry wind, single-digit humidity and a distinctive local gradient signature that develops within hours.
What this means for you
Southern California's active weather is compressed into a short season, so a full year of data here contains far fewer events than the same year in the Midwest. Give a barometric pressure forecast a couple of winters before drawing conclusions.