Second Cold Morning Across Southwest

Second morning of cold temperatures across the Southwest. Plot above is from observations between 6 and and 7 am this morning (Sunday 13 January). Here at the house the low was 17F (compared to 20F yesterday). The airport and DM both had lows of 24F. Checking around southeast Arizona I found a number of lows in the teens and colder. Coldest I found was -11F at the Columbine RAWS on Mt. Graham. The Rincon RAWS had a low of 6F, and the RAWS on Mt. Lemmon had 9F, while Empire and Rucker had lows of 10F.

From the NWS Tucson FD this afternoon:

.CLIMATE...THE RECORD LOW OF 7 DEGREES AT DOUGLAS THIS MORNING WAS  
  THE SECOND ALL TIME COLDEST JANUARY TEMPERATURE (WITH THE COLDEST  
  BEING 6 FROM 1/4/1949). IT TIED FOR 7TH ALL TIME COLDEST TEMPERATURE  
  EVER RECORDED AT DOUGLAS (WITH THE COLDEST EVER TEMPERATURE AT -4  
  FROM 12/8/1978). OTHER RECORD LOWS THIS MORNING INCLUDED:  
  LOCATION                  RECORD  OLD RECORD 
  FORT THOMAS                 11    12/1962  
  SIERRA VISTA                16    18/1916 
  WILLCOX                     07    08/1913