Thursday, Nov. 23 was the hottest Thanksgiving Day ever in Los Angeles and Newport Beach. The noon temperature in downtown L.A. hit 91 degrees at the official station, at USC. The previous record, 90, was set on Nov. 23, 1903, National Weather Service meteorologist Rich Thompson said. In Orange County, one NWS weather gauge at Newport Beach showed 89 degrees at 1 p.m., way past the previous record of 81 set in 2002. Santa Ana was at 88 at midday, below the 91 degree record set in 1950, NWS meteorologist Greg Martin said. Forecasters said heat records could also be set Thursday in the San Fernando and Antelope Valleys.