Climatological Report (Monthly)
Issued by NWS Boise, ID

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CXUS55 KBOI 011737
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1132 AM MDT TUE SEP 1 2015

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

...THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF AUGUST 2015...

AUGUST WAS ACTUALLY WARMER THAN JULY WHICH IS UNUSUAL BUT NOT RARE.
ON AVERAGE AUGUST IS THE WARMER MONTH IN ONE OUT OF FOUR YEARS.

IT MIGHT HAVE BEEN EVEN WARMER...BUT MOST OF THE MONTH THE AREA WAS
PLAGUED BY SMOKE FROM WILDFIRES. SMOKE RETARDS DAYTIME HEATING BY
SCATTERING SUNLIGHT BUT HAS NO EFFECT ON OVERNIGHT COOLING.

PRECIPITATION WAS CLOSE TO NORMAL.

THE MONTH STARTED OUT VERY HOT WITH A HIGH PRESSURE RIDGE COVERING
MOST OF THE WESTERN AND SOUTHERN STATES SOUTH OF THE CANADIAN
BORDER. ON THE 1ST AND 2ND TEMPERATURES SOARED INTO THE TRIPLE
DIGITS FOR THE FIRST TIME SINCE JULY 4.

A FEW COOLER DAYS FOLLOWED AS LOW PRESSURE SYSTEMS FROM THE GULF OF
ALASKA ATTEMPTED TO DISLODGE THE RIDGE.

BY THE 11TH THE RIDGE HAD REGAINED CONTROL SENDING TEMPERATURES BACK
UP TO THE TRIPLE DIGITS IN THE LOWER VALLEYS.

THE RIDGE MAINTAINED ITS STRENGTH THROUGH THE 14TH. BUT BY THE 15TH
IT HAD RETREATED SOUTH AND EAST ALLOWING NORTHWEST FLOW TO BRING A
TEMPORARY RESPITE FROM ABOVE NORMAL TEMPERATURES.

BY THE 23RD THE RIDGE HAD RETURNED FOR A WEEK-LONG ENCORE. BUT THIS
TIME THE HEAT WAS LESS INTENSE THAN EARLIER IN THE MONTH.

ON THE 30TH A LOW PRESSURE TROUGH WHICH HAD STALLED OFFSHORE SWUNG
INLAND BRINGING MEASURABLE RAIN TO NORTHERN IDAHO AND NORTHEAST
OREGON BUT LEAVING OUR AREA DRY AND ENDING THE MONTH WITH SLIGHTLY
BELOW NORMAL TEMPERATURES.

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1878 TO 2015

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
HIGHEST           106   08/13
LOWEST             52   08/31
AVG. MAXIMUM     91.6              89.7     1.9
AVG. MINIMUM     63.2              59.6     3.6
MEAN             77.4              74.7     2.7
DAYS MAX >= 90     18
DAYS MAX <= 32      0
DAYS MIN <= 32      0
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         2.37   1968
TOTALS           0.18              0.24   -0.06
DAYS >= .01         3
DAYS >= .10         1
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.10   08/10 TO 08/10
                        08/10 TO 08/10
                        08/10 TO 08/11

DEGREE_DAYS
HEATING TOTAL       0                10     -10        4
 SINCE 7/1          0                18     -18
COOLING TOTAL     394               309      85      343
 SINCE 1/1       1136               834     302
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              7.2
RESULTANT WIND SPEED/DIRECTION   1/151
HIGHEST WIND SPEED/DIRECTION    40/190    DATE  08/10
HIGHEST GUST SPEED/DIRECTION    61/180    DATE  08/10

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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