Summer so far in San Luis Obispo County has been cooler than normal, a new analysis shows.
Local weather expert John Lindsey said today that daily high temperatures for July across San Luis Obispo County were below historical averages.
In San Luis Obispo, the high last month averaged 75.1 degrees. The historical average for the month in SLO is 78.3 degrees.
In Paso Robles, the high last month averaged 89.7 degrees — below the historical average of 93.8 degrees, Lindsey said.
The cooler temperatures gave rise to an unusual sight at the California Mid-State Fair’s rodeo on Saturday night: widespread use of sweatshirts and jackets to take the chill off the evening show.
The cause of the cool weather? “A persistent trough of low pressure along the West Coast produced below-normal temperatures in San Luis Obispo County for the month,” Lindsey said.
The low pressure allowed winds to blow in from the cold Pacific Ocean and cool down the county.
The forecast for this week shows this pattern continuing, Lindsey said. Tuesday will be warm, but fog will redevelop along the coastline Wednesday and make for below-normal high temperatures. Coastal valleys and the North County will experience cooling starting Thursday and continuing into the weekend.
“It will probably be early next week when temperatures may begin to warm back up to near normal with night and morning low clouds along the coast,” said Lindsey. “There is no sign of any extreme heat over the next seven to 10 days or longer.”