Get out those fall clothes, L.A.: Temperatures could drop by 20 degrees

Get out those fall clothes, L.A.: Temperatures could drop by 20 degrees
After a warm Halloween weekend, meteorologists say temperatures in Southern California could drop by as much as 20 degrees early this week. (Stuart Palley / For The Times)

Cooler weather is forecast for the Los Angeles area.



After a warm, dry Halloween weekend, and the hottest October ever for much of Southern California, meteorologists say temperatures could drop by as much as 20 degrees on Monday. There's even a 40% chance of rain Monday and Tuesday.

"It's going to be a real shocker for Angelenos," said Bill Patzert, a climatologist with NASA's Jet Propulsion Laboratory in La Cañada Flintridge. "People can bring out their long-sleeved shirts -- if they can find them."

On Monday, highs in the 60s and 70s are expected in the coastal and valley areas. There's also a chance of gusty winds, said Scott Sukup, a meteorologist with the National Weather Service.

The cool air is coming down from the northwest, having traveled over the Gulf of Alaska.

The change in temperature and the possible rain have nothing to do with El Nino, according to Sukup. Storms linked to that weather phenomenon are expected to start in January and last through March.

Unfortunately, experts say the cooler temperatures are not going to linger.

"The low pressure is going to move east and we might get a little bit of a weak offshore flow, which will cause temperatures to rise again," Sukup said.

So soak it up now, Angelenos.

"It's a temporary treat for everyone," Patzert said. "It's a teaser."

There is no such thing as "normal" weather for Southern California, meteorologists said, but this October was unusually warm.

According to the weather service, last month saw some of the highest temperatures on record.

The average mean temperature in downtown Los Angeles was 75.6 degrees in October, breaking the previous record of 74.2, which had held since 1983. At Los Angeles International Airport, the average mean temperature of 74 shattered the record of 72.5, which held even longer -- since 1958.

October 2015 also set records in Woodland Hills, Burbank, Santa Barbara, and Oxnard, according to the weather service.