Climatological Report (Monthly)
Issued by NWS Boise, ID

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CXUS55 KBOI 011757
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1144 AM MDT SAT JUL 1 2017

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

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

JUNE WAS UNSETTLED, WITH ALTERNATING COOL AND WARM PERIODS MORE
CHARACTERISTIC OF SPRING THAN SUMMER.

OVERALL, JUNE WAS SLIGHTLY WARMER THAN NORMAL, BUT DAILY AVERAGES
FLUCTUATED FROM 15 DEGREES ABOVE NORMAL ON THE 7TH TO 12 DEGREES
BELOW NORMAL JUST A FEW DAYS LATER ON THE 11TH. NO RECORDS WERE
EQUALED OR BROKEN.

PRECIPITATION WAS SLIGHTLY MORE THAN TWICE NORMAL, ALTHOUGH IT WAS A
MOSTLY DRY MONTH. THE ANOMALY OCCURRED ON THE 11TH AND 12TH, WHEN A
1.15 INCH RAINFALL WAS MEASURED AT THE AIRPORT. THE TOTAL FOR THE
OTHER 28 DAYS WAS ONLY A QUARTER INCH.

THE FIRST WEEK WAS WARM AND DRY, DOMINATED BY AN UPPER LEVEL HIGH
PRESSURE RIDGE EXTENDING FROM THE COLORADO PLATEAU TO THE NORTHERN
PLAINS. THE HIGH FOR THE MONTH OF 97 ON THE 7TH WAS REPEATED ON THE
25TH.

ON THE 9TH A COLD UPPER LEVEL LOW PRESSURE AREA FROM THE GULF OF
ALASKA BEGAN TO INVADE THE PACIFIC NORTHWEST STATES. BY THE 12TH IT
WAS CENTERED OVER THE IDAHO-NEVADA BORDER. THE WELL DEVELOPED
COUNTERCLOCKWISE CIRCULATION PULLED IN COPIOUS MOISTURE WHICH
ORIGINATED IN THE GULF OF MEXICO AND CROSSED THE ROCKIES FROM
EASTERN MONTANA. THIS RESULTED IN THE HEAVY RAIN WHICH FELL MAINLY
OVERNIGHT BETWEEN THE 11TH AND 12TH.

DESPITE THE SUBTROPICAL ORIGIN OF THIS MOISTURE, COLD NORTH PACIFIC
AIR KEPT BOISE`S TEMPERATURE WELL BELOW NORMAL.

FOLLOWING THIS SYSTEM, THE TEMPERATURE REBOUNDED TO NORMAL ON THE
15TH. AND ON THE 19TH AND 20TH THE UPPER LEVEL RIDGE, HAVING
EXPANDED NORTH FROM THE DESERT SOUTHWEST, PUSHED THE TEMPERATURE UP
TO 96 BOTH DAYS.

SOJOURNS OF WESTERLY OR NORTHWESTERLY FLOW ALOFT KEPT TEMEPRATURES
CLOSE TO NORMAL FROM THE 22ND THROUGH THE 24TH, AND FROM THE 28TH
THROUGH THE 30TH. A BRIEF INCURSION OF THE UPPER LEVEL RIDGE BROUGHT
MORE HOT WEATHER ON THE 25TH, WITH A HIGH OF 97 FOR THE SECOND TIME
DURING THE MONTH, AND A HIGH OF 96 ON THE 26TH.

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            97   06/25
                        06/07
LOWEST             43   06/11
AVG. MAXIMUM     82.1              81.3     0.8
AVG. MINIMUM     55.8              53.7     2.1
MEAN             69.0              67.5     1.5
DAYS MAX >= 90      7
DAYS MAX <= 32      0
DAYS MIN <= 32      0
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.41   1941
TOTALS           1.40              0.69    0.71
DAYS >= .01         6
DAYS >= .10         3
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.95   06/12 TO 06/12

DEGREE_DAYS
HEATING TOTAL      45                64     -19       37
 SINCE 7/1       5499              5514     -15
COOLING TOTAL     171               139      32      247
 SINCE 1/1        233               183      50
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              7.8
RESULTANT WIND SPEED/DIRECTION   3/310
HIGHEST WIND SPEED/DIRECTION    40/310    DATE  06/04
HIGHEST GUST SPEED/DIRECTION    54/330    DATE  06/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     45


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

$$



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