San Diego County is in the midst of the sixth driest rainy season on record, conditions that could lead to rare and sizable spring wildfires if things stay dry, the National Weather Service said on Tuesday.

San Diego International Airport has recorded only 4.36 inches of rain since the official water year began on Oct. 1. That’s more than 4 inches below normal. The airport averages 10.33 inches of rain from Oct. 1 to Sept. 30.