332  
CDGM40 PGUM 201615  
CLIGUM  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE TIYAN GUAM  
215 AM CHST TUE OCT 21 2025  
   
...............................  
 
...THE GUAM INTERNATIONAL AIRPORT CLIMATE SUMMARY FOR OCTOBER 20 2025...  
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1945 TO 2025  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................  
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 81 1:58 AM 91 2014 88 -7 85  
MINIMUM 75 9:49 AM 66 1965 77 -2 74  
AVERAGE 78 82 -4 80  
 
PRECIPITATION (IN)  
YESTERDAY 0.89 4.05 2024 0.40 0.49 4.05  
MONTH TO DATE 11.99 8.77 3.22 14.23  
SINCE SEP 1 24.33 23.94 0.39 38.61  
SINCE JAN 1 79.61 80.57 -0.96 85.83  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE SEP 1 0 0 0 0  
SINCE JUL 1 0 0 0 0  
 
COOLING  
YESTERDAY 13 17 -4 15  
MONTH TO DATE 322 340 -18 328  
SINCE SEP 1 811 842 -31 842  
SINCE JAN 1 4940 4970 -30 4940    
...............................................................  
 
WIND (MPH)  
RESULTANT WIND SPEED 9 RESULTANT WIND DIRECTION E (80)  
HIGHEST WIND SPEED 24 HIGHEST WIND DIRECTION E (80)  
HIGHEST GUST SPEED 37 HIGHEST GUST DIRECTION E (70)  
AVERAGE WIND SPEED 9.8  
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 12:00 PM  
LOWEST 79 9:00 PM  
AVERAGE 85  
   
......................................................  
 
THE GUAM INTERNATIONAL AIRPORT CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 88 90 2012  
2014  
2016  
MINIMUM TEMPERATURE (F) 77 68 1969  
1973  
1978  
 
SUNRISE AND SUNSET  
OCTOBER 21 2025.......SUNRISE 6:12 AM CHST SUNSET 5:58 PM CHST  
OCTOBER 22 2025.......SUNRISE 6:13 AM CHST SUNSET 5:58 PM CHST  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 
 
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