Climatological Report (Monthly)
Issued by NWS Boise, ID

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CXUS55 KBOI 011801
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1056 AM MST FRI DEC 1 2017

NOVEMBER`S AVERAGE OF 43.8 DEGREES IS THE TENTH WARMEST AT THE BOISE
AIRPORT. ASIDE FROM A COOL SPELL FROM THE 4TH THROUGH THE 8TH,
TEMPERATURES AVERAGED ABOVE NORMAL ON MOST DAYS. ONLY TEN NIGHTS HAD
LOWS WERE BELOW FREEZING. THE LOW OF 47 ON THE 22ND SET A RECORD
HIGH MINIMUM FOR THAT DATE, ECLIPSING THE OLD RECORD OF 46 SET IN
1921.

MEASURABLE RAIN FELL ON HALF THE DAYS. THE MONTHLY TOTAL OF 1.77
INCHES IS NEARLY HALF AN INCH ABOVE NORMAL AND RANKS AMONG THE
WETTEST 25 PERCENT OF NOVEMBERS AT THE AIRPORT.

TYPICAL OF FALL, THE WEATHER PATTERN WAS ACTIVE, WITH PASSING
WEATHER SYSTEMS BRINGING SHOWERY PERIODS AND CHANGEABLE
TEMPERATURES.

ON THE 3RD A LOW PRESSURE TROUGH FROM BRITISH COLUMBIA BROUGHT BOISE
THE COOLEST WEATHER SINCE LAST WINTER, AND OVER HALF AN INCH OF RAIN
FROM THE 3RD THROUGH THE 6TH. BELOW NORMAL TEMPERATURES PERSISTED
THROUGH THE 8TH. THE LOW OF 25 ON THE 7TH WAS THE LOW FOR THE MONTH
AND THE COLDEST READING SINCE FEBRUARY 25.

WARMER MORE SEASONABLE WEATHER RETURNED ON THE THE 9TH. A WEAK HIGH
PRESSURE RIDGE OVER THE WESTERN U.S. AND A PERSISTENT LOW PRESSURE
TROUGH OFF THE NORTHWEST COAST KEPT US UNDER SOUTHWEST FLOW ALOFT,
MAINTAINING NEAR NORMAL OR SLIGHTLY ABOVE NORMAL TEMPERATURES
THROUGH THE 20TH.

WEATHER DISTURBANCES MOVING INLAND WEAKENED AS THEY TRAVERSED THE
RIDGE, BUT THEY RETAINED ENOUGH MOISTURE FOR MODERATE AMOUNTS OF
RAIN ON THE 10TH, AND AGAIN ON THE 14TH AND 15TH.

ON THE 21ST AN UNSEASONABLY WARM HIGH PRESSURE RIDGE BUILT OVER THE
DESERT SOUTHWEST AND NORTHWEST MEXICO, CREATING A SOURCE OF WARM AIR
FOR THE NORTHERN INTERMOUNTAIN REGION. FROM THE 20TH THROUGH THE
27TH, BOISE`S DAILY AVERAGE TEMPERATURES RANGED FROM 6 TO 19 DEGREES
ABOVE NORMAL.

MOISTURE AND WEAK WEATHER SYSTEMS MOVING THROUGH THE NORTH PORTION
OF THE RIDGE GENERATED NEARLY DAILY SHOWERS AS FAR SOUTH AS NORTHERN
NEVADA. AMOUNTS WERE MOSTLY LIGHT, BUT A STRONGER DISTURBANCE ON THE
24TH PRODUCED A QUARTER INCH OF RAIN AT THE BOISE AIRPORT.

THE RIDGE WEAKENED FOLLOWING A PACIFIC WEATHER SYSTEM WHICH CROSSED
THE GREAT BASIN THE THE 27TH, AND TEMPERATURES AT BOISE RETURNED TO
NEAR NORMAL ON THE 29TH FOLLOWING A PACIFIC COLD FRONT.

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

...THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF NOVEMBER 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            66   11/23
LOWEST             25   11/07
AVG. MAXIMUM     52.2              48.2     4.0
AVG. MINIMUM     35.3              31.9     3.4
MEAN             43.8              40.0     3.8
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32     11
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.43   1874
TOTALS           1.77              1.35    0.42
DAYS >= .01        15
DAYS >= .10         9
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.37   11/03 TO 11/04

SNOWFALL (INCHES)
TOTALS            0.0
SINCE 7/1           T
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL      0.0   11/30 TO 11/30

DEGREE_DAYS
HEATING TOTAL     631               748    -117      540
 SINCE 7/1       1224              1254     -30
COOLING TOTAL       0                 0       0        0
 SINCE 1/1       1341               942     399
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              8.3
RESULTANT WIND SPEED/DIRECTION   4/143
HIGHEST WIND SPEED/DIRECTION    33/310    DATE  11/09
HIGHEST GUST SPEED/DIRECTION    44/300    DATE  11/09

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     65


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

$$


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