174  
CXUS52 KJAX 011413  
CLMSSI  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE JACKSONVILLE FL  
1008 AM EDT MON OCT 1 2018  
   
...............................
 
 
 
...THE ST SIMONS ISLAND CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2018...  
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1948 TO 2018  
 
WEATHER OBSERVED NORMAL DEPART  
VALUE DATE(S) VALUE FROM  
NORMAL    
............................................
 
 
TEMPERATURE (F)  
RECORD  
HIGH 97 09/16/1972  
LOW 49 09/30/1967  
HIGHEST 96 09/16 85 11  
LOWEST 73 09/22 72 1  
AVG. MAXIMUM 89.9 84.7 5.2  
AVG. MINIMUM 77.1 71.6 5.5  
MEAN 83.5 78.1 5.4  
DAYS MAX >= 90 12 3.0 9.0  
DAYS MAX <= 32 0 0.0 0.0  
DAYS MIN <= 32 0 0.0 0.0  
DAYS MIN <= 0 0 0.0 0.0  
 
PRECIPITATION (INCHES)  
RECORD  
MAXIMUM 21.19 1962  
MINIMUM 0.09 1981  
TOTALS 3.57 5.76 -2.19  
DAILY AVG. 0.12 0.19 -0.07  
DAYS >= .01 13 10.4 2.6  
DAYS >= .10 10 7.5 2.5  
DAYS >= .50 3 3.9 -0.9  
DAYS >= 1.00 0 1.9 -1.9  
GREATEST  
24 HR. TOTAL 0.87 09/03 TO 09/03  
STORM TOTAL MM  
(MM/DD(HH)) MM  
 
SNOWFALL (INCHES)  
RECORDS  
TOTAL MM MM  
24 HR TOTAL MM  
TOTALS 0.0 0.0 0.0  
LIQUID EQUIV 0.00 0.00 0.00  
SINCE 7/1 0.0 0.0 0.0  
LIQUID 7/1 0.00  
DAYS >= TRACE 0 0.0 0.0  
DAYS >= 1.0 0 0.0 0.0  
GREATEST  
SNOW DEPTH 0 MM  
24 HR TOTAL 0.0 09/30 TO 09/30  
STORM TOTAL MM  
(MM/DD(HH)) MM  
 
DEGREE_DAYS  
HEATING TOTAL 0 0 0  
SINCE 7/1 0 0 0  
COOLING TOTAL 563 395 168  
SINCE 1/1 2795 2371 424  
 
FREEZE DATES  
RECORD  
EARLIEST 11/03/1954  
LATEST 03/31/1964  
EARLIEST 12/20  
LATEST 02/14    
.............................................
 
 
WIND (MPH)  
AVERAGE WIND SPEED 7.8  
HIGHEST WIND SPEED/DIRECTION 31/060 DATE 09/18  
HIGHEST GUST SPEED/DIRECTION 58/040 DATE 09/18  
 
SKY COVER  
POSSIBLE SUNSHINE (PERCENT) MM  
AVERAGE SKY COVER 0.20  
NUMBER OF DAYS FAIR 26  
NUMBER OF DAYS PC 4  
NUMBER OF DAYS CLOUDY 0  
 
AVERAGE RH (PERCENT) 73  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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