Idyllwild set the lowest minimum temperature and tied the lowest maximum temperature records on Tuesday.  See report from the National Weather Service below…
RECORD REPORT
SXUS76 KSGX 110500
RERSGX

RECORD EVENT REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
812 PM PST TUE FEB 10 2009

…LOWEST MINIMUM TEMPERATURE RECORDS BROKEN OR TIED ON FEBRUARY 10…

LOCATION [...]

List of records set on Wednesday. Both lowest maximum temperature and rainfall.
RECORD REPORT
SXUS76 KSGX 180706 CCA
RERSGX

RECORD EVENT REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1040 PM PST WED DEC 17 2008

…LOWEST MAXIMUM TEMPERATURE RECORDS BROKEN OR TIED ON DECEMBER 17…

LOCATION [...]

A cold storm dropping south out of British Columbia will begin to affect us here in the valley starting Tuesday. This cold storm won’t have much moisture to work with but it will bring some cool temperatures. Highs Tuesday through Friday are only expected to be in the mid 50’s! Snow levels will drop [...]

It was a cool one in the valley today. 14 degrees below normal with a high of 77. Don’t expect it to stay around. A warm up will begin tomorrow as high pressure builds taking us back to near and above temperatures in the upper 90’s.