Climatological Report (Monthly)
Issued by NWS Tiyan, Guam

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699
CXGM50 PGUM 040825
CLMGUM

CLIMATE REPORT
NATIONAL WEATHER SERVICE TIYAN GUAM
625 PM CHST MON AUG 04 2025

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

...THE GUAM INTERNATIONAL AIRPORT CLIMATE SUMMARY FOR THE MONTH OF JULY 2025...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1945 TO 2025

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             95   07/18/1969
 LOW              69   07/10/2006
HIGHEST           90   07/29                          89  07/24
                                                          07/27
                                                          07/28
LOWEST            74   07/25                          74  07/25
                                                          07/26
                                                          07/27
AVG. MAXIMUM    86.3               87.9    -1.6     87.3
AVG. MINIMUM    77.1               77.1    -0.0     77.3
MEAN            81.7
DAYS MAX >= 90     1                6.8    -5.8        0
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     0                0.0     0.0        0
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM       29.80   2002 (9.35" TY CHATAAN)
 MINIMUM        4.46   1954
TOTALS         12.99              12.25    0.74     7.51
DAILY AVG.      0.42               0.40    0.02     0.24
DAYS >= .01       27               26.0     1.0       29
DAYS >= .10       19               17.8     1.2       23
DAYS >= .50        9                6.7     2.3        4
DAYS >= 1.00       4                3.3     0.7        0
DAYS >= 3.00       0
GREATEST
 24 HR. TOTAL   2.04   07/20 TO 07/20               0.89


DEGREE DAYS
COOLING TOTAL    525                542     -17      546
 SINCE 1/1      3598               3606      -8     3558

FREEZE DATES
................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.5
RESULTANT WIND SPEED/DIRECTION   4/140
HIGHEST WIND SPEED/DIRECTION    25/260    DATE  07/27
HIGHEST GUST SPEED/DIRECTION    39/000    DATE  07/25

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.37
NUMBER OF DAYS FAIR           17
NUMBER OF DAYS PC             13
NUMBER OF DAYS CLOUDY          1

AVERAGE RH (PERCENT)     83

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     HEAVY RAIN                13
RAIN                     16     LIGHT RAIN                29
FOG                       0     HAZE                       0

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

$$