Climatological Report (Monthly)
Issued by NWS Boise, ID

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926
CXUS55 KBOI 011734
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1134 AM MDT THU AUG 1 2019

THE AVERAGE TEMPERATURE FOR THE MONTH WAS LESS THAN ONE DEGREE ABOVE
NORMAL. NO TEMPERATURE RECORDS WERE BROKEN, BUT THE LOW OF 76 ON THE
23RD TIED THE RECORD HIGH LOW FOR THAT DATE SET IN 1994.

AT THE AIRPORT, THE ONLY TRIPLE DIGIT HIGH WAS THE 102 ON THE 22ND.
THE NORMAL FOR JULY IS 4 DAYS OF 100 OR HIGHER. THE NORMAL FOR
SUMMER (JUNE-AUGUST) IS 7. LAST SUMMER HAD 14, WITH 9 IN JULY AND
THE REST IN AUGUST, INCLUDING THE 110 ON AUGUST 10.

ONLY .01 INCH OF RAIN FELL AT THE NATIONAL WEATHER SERVICE OFFICE,
WHICH RANKS IN THE DRIEST 15 PERCENT OF JULYS.

JULY AND AUGUST ARE NORMALLY THE DRIEST MONTHS, AVERAGING .33 INCH
AND .24 INCH RESPECTIVELY.

AS IS COMMON AT THIS TIME OF YEAR, UPPER LEVEL TROUGHS FROM THE
NORTH PACIFIC WEAKENED AS THEY ENCOUNTERED THE STRONG SUMMER HIGH
PRESSURE RIDGE OVER THE WESTERN U.S. THE RIDGE DIVERTED THESE
SYSTEMS TOO FAR NORTH TO BRING MEASURABLE RAIN TO THE BOISE AREA.

UPPER-LEVEL WINDS WERE USUALLY FROM THE SOUTHWEST, WITH ENOUGH
WESTERLY COMPONENT TO SHUNT MONSOON MOISTURE EAST BEFORE IT REACHED
THE TREASURE VALLEY. WHEN IT DID MANAGE TO DRIFT THIS FAR NORTH AND
WEST, IT USUALLY BROUGHT ONLY CLOUD COVER, WHICH HINDERED THE
HEATING THAT DRIVES CONVECTION, SO ONLY A FEW SPRINKLES RESULTED.

WEAK COLD FRONTS ACCOMPANYING THE PACIFIC SYSTEMS WERE FOLLOWED BY
SLIGHTLY COOLER AND MUCH DRIER AIR. FOR EXAMPLE, THE AFTERNOON
HUMIDITY DROPPED TO 7 PERCENT ON THE 19TH AND 8 PERCENT ON THE 24TH
AFTER FRONTAL PASSAGES. ON THE OTHER DAYS MINIMUM HUMIDITIES WERE IN
THE TEENS AND 20S.

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

...THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF JULY 2019...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1875 TO 2019

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
HIGHEST           102   07/22
LOWEST             53   07/20
                        07/04
AVG. MAXIMUM     91.4              91.2     0.2
AVG. MINIMUM     61.7              60.4     1.3
MEAN             76.5              75.8     0.7
DAYS MAX >= 90     19
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   07/29 TO 07/29

DEGREE_DAYS
HEATING TOTAL       0                 8      -8        2
 SINCE 7/1          0                 8      -8
COOLING TOTAL     365               342      23      477
 SINCE 1/1        524               525      -1
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.9
RESULTANT WIND SPEED/DIRECTION   2/313
HIGHEST WIND SPEED/DIRECTION    35/310    DATE  07/14
HIGHEST GUST SPEED/DIRECTION    46/310    DATE  07/14

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     37


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

$$



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