AFOS product CLIAPC
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CDUS46 KMTR 220834
CLIAPC


CLIMATE REPORT
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA                      
1227 AM PST SAT DEC 22 2018


................................... 

...THE NAPA AIRPORT  CLIMATE SUMMARY FOR DECEMBER 21 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2018


WEATHER ITEM   OBSERVED TIME   RECORD YEAR NORMAL DEPARTURE LAST     
                VALUE   (LST)  VALUE       VALUE  FROM      YEAR     
                                                  NORMAL             
..................................................................
TEMPERATURE (F)                                                     
 YESTERDAY                                                           
  MAXIMUM         59    358 PM  71    1999  55      4       61       
  MINIMUM         40   1157 PM  21    1998  36      4       30       
  AVERAGE         50                        45      5       46      
                                                                     
PRECIPITATION (IN)                                                   
  YESTERDAY        0.13                                      0.00    
  MONTH TO DATE    1.50                                      0.06    
  SINCE OCT 1      2.76                                      3.03    
  SINCE JAN 1     15.53                                     31.21    
                                                                     
DEGREE DAYS                                                          
 HEATING                                                             
  YESTERDAY       15                                        19       
  MONTH TO DATE  316                                       354       
  SINCE DEC 1    316                                       354       
  SINCE JUL 1    883                                       882       
                                                                     
 COOLING                                                             
  YESTERDAY        0                                         0       
  MONTH TO DATE    0                                         0       
  SINCE DEC 1      0                                         0       
  SINCE JAN 1    182                                       530       
..................................................................


WIND (MPH)                                                           
  RESULTANT WIND SPEED   1   RESULTANT WIND DIRECTION  SE (150)      
  HIGHEST WIND SPEED     8   HIGHEST WIND DIRECTION     E (90)       
  HIGHEST GUST SPEED    11   HIGHEST GUST DIRECTION     E (90)       
  AVERAGE WIND SPEED     2.3                                         

                                                                     
SKY COVER                                                            
  POSSIBLE SUNSHINE  MM                                              
  AVERAGE SKY COVER 0.6                                              

                                                                     
WEATHER CONDITIONS                                                  
 THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.                        
  LIGHT RAIN                                                         
  FOG                                                                
  FOG W/VISIBILITY <= 1/4 MILE                                       

                                                                     
RELATIVE HUMIDITY (PERCENT)                                          
 HIGHEST   100           700 PM                                     
 LOWEST     75           400 PM                                     
 AVERAGE    88                                                       

..........................................................

                                                                     
THE NAPA AIRPORT  CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR                    
 MAXIMUM TEMPERATURE (F)   55        68      1999                    
 MINIMUM TEMPERATURE (F)   36        19      1998                    

                                                                     
SUNRISE AND SUNSET                                                   
DECEMBER 22 2018......SUNRISE   723 AM PST   SUNSET   453 PM PST   
DECEMBER 23 2018......SUNRISE   723 AM PST   SUNSET   454 PM PST   

                                                                    
-  INDICATES NEGATIVE NUMBERS.                                      
R  INDICATES RECORD WAS SET OR TIED.                                
MM INDICATES DATA IS MISSING.                                       
T  INDICATES TRACE AMOUNT.                                          




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