Climatological Report (Monthly)
Issued by NWS Boise, ID

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CXUS55 KBOI 020937
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
333 AM MDT WED AUG 2 2017

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

...THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF JULY 2017...

JULY WAS HOT. THE AVERAGE TEMPERATURE OF 81.6 DEGREES RANKED SECOND
FOR ALL YEARS BACK TO 1877. ONLY JULY 2007, WHICH AVERAGED 83.1
DEGREES, WAS HOTTER. ON THE OTHER END OF THE SCALE, JULY 1993
AVERAGED A RATHER CHILLY 65.0 DEGREES.

IT WAS A DRY MONTH. ONLY .01 INCH WAS MEASURED AT THE AIRPORT. DRY
SUMMER MONTHS ARE NOT UNUSUAL. SINCE 1877, 33 JULYS WERE AS DRY OR
DRIER.

A SEMI-PERMANENT WARM UPPER LEVEL RIDGE, WHICH NORMALLY FORMS OVER
THE COLORADO PLATEAU DURING LATE SPRING AND EARLY SUMMER, KEPT MOST
THE THE NORTHWEST U.S. DRY THROUGH THE MONTH. WEATHER SYSTEMS FROM
THE GULF OF ALASKA WERE BLOCKED FROM PENETRATING VERY FAR SOUTH OF
THE CANADIAN BORDER, AND WERE FORCED TO MOVE EAST OVER SOUTHERN
CANADA.

ON THREE OCCASIONS THE RIDGE EXPANDED NORTH. FROM THE 4TH THROUGH
THE 9TH, THE 13TH THROUGH THE 15TH, AND THE 29TH THROUGH THE 31ST,
BOISE WAS DIRECTLY UNDER THE RIDGE, RESULTING IN TRIPLE DIGIT HIGHS.

MONSOON MOISTURE DRIFTING NORTH FROM NEVADA PRODUCED LOCALLY WET
LATE AFTERNOON AND EVENING THUNDERSTORMS. ON SEVERAL DAYS,
THUNDERSTORMS FORMED OVER OWYHEE COUNTY, BUT THEY WEAKENED AS THEY
MOVED OVER THE OWYHEE MOUNTAINS. ANY RAIN THAT REACHED THE GROUND
USUALLY MISSED THE NWS RAIN GAUGES.


CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1875 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
HIGHEST           104   07/08
LOWEST             58   07/21
AVG. MAXIMUM     97.3              91.2     6.1
AVG. MINIMUM     65.9              60.4     5.5
MEAN             81.6              75.8     5.8
DAYS MAX >= 90     31
DAYS MAX <= 32      0
DAYS MIN <= 32      0
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         2.01   1913
TOTALS           0.01              0.33   -0.32
DAYS >= .01         1
DAYS >= .10         0
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.01   07/26 TO 07/26

DEGREE_DAYS
HEATING TOTAL       0                 8      -8        8
 SINCE 7/1          0                 8      -8
COOLING TOTAL     521               342     179      339
 SINCE 1/1        754               525     229
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.6
RESULTANT WIND SPEED/DIRECTION   1/319
HIGHEST WIND SPEED/DIRECTION    23/290    DATE  07/24
HIGHEST GUST SPEED/DIRECTION    31/300    DATE  07/24

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     31


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

$$


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