Climatological Report (Monthly)
Issued by NWS Boise, ID

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CXUS55 KBOI 011833
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1056 AM MDT WED NOV 1 2017

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

OCTOBER 2017 RANKS AMONG THE COLDEST 22 PERCENT OF OCTOBERS AT THE
BOISE AIRPORT.

TEMPERATURES AVERAGED 7.1 DEGREES BELOW NORMAL FROM THE 1ST THROUGH
THE 16TH, AND 1.3 DEGREES ABOVE NORMAL FOR THE REST OF THE MONTH.

PRECIPITATION TOTALED NEAR NORMAL.

THE FIRST FREEZING TEMPERATURE OF THE SEASON WAS THE 31 ON THE 9TH,
A DAY AHEAD OF THE AVERAGE DATE.

THERE WERE NO RECORD HIGHS, LOWS, OR DAILY PRECIPITATION AMOUNTS.

DURING THE FIRST HALF OF THE MONTH, COLD UPPER LEVEL TROUGHS WERE
THE DOMINANT FEATURES. BRIEF PERIODS OF WEST OR SOUTHWEST FLOW ALOFT
RAISED TEMPERATURES TO NEAR NORMAL ON THE 6TH, 7TH, AND 10TH, BUT
THERE WERE NO ABOVE NORMAL DAILY AVERAGES.

DURING THE LAST HALF OF THE MONTH, TEMPERATURES WERE NEAR OR ABOVE
NORMAL MOST DAYS, THANKS TO WEST OR SOUTHWEST FLOW ALOFT, AND STRONG
UPPER LEVEL HIGH PRESSURE RIDGES ON THE 23RD AND 24TH, AND AGAIN ON
THE 27TH AND 28TH.

THIS WARMER PATTERN WAS BRIEFLY INTERRUPTED BY A NORTH PACIFIC COLD
FRONT WHICH CROSSED THE BOISE AREA AROUND 4:30 AM ON THE 20TH. THE
FRONTAL PASSAGE WAS ACCOMPANIED BY NORTHWEST WINDS GUSTING UP TO 42
MPH AT THE AIRPORT, CAUSING VISIBILITY RESTRICTIONS IN BLOWING DUST.
RAIN SETTLED THE DUST A COUPLE OF HOURS LATER AS A COLD UPPER LEVEL
TROUGH PUSHED INLAND BEHIND THE FRONT. PRECIPITATION ON THE 20TH AND
21ST TOTALED .37 INCH AT THE AIRPORT. ONE LOCATION CLOSER TO THE
FOOTHILLS REPORTED AROUND HALF AN INCH OF RAIN.

ON THE 29TH, THE UPPER LEVEL RIDGE, WHICH HAD KEPT BOISE WARMER THAN
NORMAL ON THE 27TH AND 28TH, SHIFTED WEST. THIS PUT OUR AREA UNDER
NORTHWEST FLOW ALOFT, ALLOWING COOLER AIR FROM BRITISH COLUMBIA TO
SPREAD SOUTH ACROSS THE NORTHERN INTERMOUNTAIN REGION.

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

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            78   10/19
LOWEST             29   10/31
                        10/14
AVG. MAXIMUM     62.0              64.8    -2.8
AVG. MINIMUM     37.8              40.9    -3.1
MEAN             49.9              52.8    -2.9
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      4
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.06   1883
TOTALS           0.60              0.75   -0.15
DAYS >= .01         5
DAYS >= .10         3
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.21   10/20 TO 10/20

SNOWFALL (INCHES)
TOTALS              T
SINCE 7/1           T
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL        T   10/13 TO 10/13

DEGREE_DAYS
HEATING TOTAL     462               385      77      268
 SINCE 7/1        593               506      87
COOLING TOTAL       0                 8      -8        1
 SINCE 1/1       1341               942     399
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.8
RESULTANT WIND SPEED/DIRECTION   1/142
HIGHEST WIND SPEED/DIRECTION    33/300    DATE  10/20
HIGHEST GUST SPEED/DIRECTION    42/310    DATE  10/20

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     55


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

$$



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