Climatological Report (Monthly)
Issued by NWS Spokane, WA

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CXUS56 KOTX 030221 CCA
CLMGEG

CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE, WA
621 PM PST TUE JAN 2 2018

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

...THE SPOKANE WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1881 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              60   12/10/1939
 LOW              -25   12/30/1968
HIGHEST            42   12/19        MM      MM       41  12/04
                                                          12/03
LOWEST              7   12/24        MM      MM       -7  12/16
AVG. MAXIMUM     31.1              32.2    -1.1     29.2
AVG. MINIMUM     22.3              22.5    -0.2     16.9
MEAN             26.7              27.4    -0.7     23.1
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     17              13.6     3.4       20
DAYS MIN <= 32     29              26.3     2.7       31
DAYS MIN <= 0       0               1.1    -1.1        2

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.13   1964
 MINIMUM         0.21   1883
TOTALS           2.88              2.30    0.58     1.49
DAILY AVG.       0.09              0.07    0.02     0.05
DAYS >= .01        13              13.2    -0.2       14
DAYS >= .10         5               7.2    -2.2        6
DAYS >= .50         2               1.1     0.9        0
DAYS >= 1.00        1               0.1     0.9        0
GREATEST
 24 HR. TOTAL    1.12   12/19 TO 12/19           12/23 TO 12/24

SNOWFALL (INCHES)
RECORDS
 TOTAL           61.5   2008
TOTALS           17.1              14.6     2.5     19.0
SINCE 7/1        24.3              22.1     2.2     22.3
SNOWDEPTH AVG.      1                 4      -3        3
DAYS >= 1.0         5               4.7     0.3        7
GREATEST
 SNOW DEPTH         6   12/17                          6  12/27
                        12/16                             12/24
 24 HR TOTAL      7.1   12/15 TO 12/15           12/24 TO 12/24

DEGREE_DAYS
HEATING TOTAL    1179              1167      12     1289
 SINCE 7/1       2719              2834    -115     2622
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        794               450     344      494
.....................................................

WIND (MPH)
AVERAGE WIND SPEED              5.8
HIGHEST WIND SPEED/DIRECTION    31/230    DATE  12/30
HIGHEST GUST SPEED/DIRECTION    37/230    DATE  12/30

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            5
NUMBER OF DAYS PC              3
NUMBER OF DAYS CLOUDY         23

AVERAGE RH (PERCENT)     90

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                5     FREEZING RAIN              1
LT FREEZING RAIN          6     HAIL                       0
HEAVY SNOW                1     SNOW                       7
LIGHT SNOW               17     SLEET                      1
FOG                      24     FOG W/VIS <= 1/4 MILE      7
HAZE                      1

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

$$

DECEMBER 2017 FINISHED SLIGHTLY COOLER THAN NORMAL WITH ABOUT NORMAL
PRECIPITATION AROUND NE WASHINGTON INTO THE NORTH IDAHO PANHANDLE.
THE FIRST HALF OF THE MONTH WAS DOMINATED BY STRONG HIGH PRESSURE
WHICH BROUGHT MILD...DRY CONDITIONS TO THE MOUNTAINS AND COLD AND
EVENTUALLY CLOUDY CONDITIONS TO THE VALLEYS.  FREEZING DRIZZLE ON
THE 9TH AND 12TH LED TO SLICK ROADS AND SEVERAL SLIDEOFFS OVER PARTS
OF THE REGION. THE SECOND HALF OF THE MONTH WAS MUCH MORE ACTIVE. ON
THE 15TH A TROUGH DROPPED IN FROM THE GULF OF ALASKA. A LOCALIZED
BAND OF HEAVY SNOW HIT THE SPOKANE AREA WITH 7 INCHES AT THE AIRPORT
AND 8 INCHES IN ROSALIA. ON THE 19TH STRONG LOW PRESSURE SYSTEM
BROUGHT MODERATE-HEAVY PRECIPITATION.  SNOW CHANGED TO RAIN IN
SPOKANE WITH 1 TO 3 INCHES.  HEAVY SNOW FELL NORTH OF SPOKANE WITH
13 INCHES IN SAGLE...BONNERS FERRY...AND DIAMOND LAKE. HEAVY WET
SNOW LED TO THOUSANDS WITHOUT POWER IN NORTH IDAHO. SPOKANE RECEIVED
1.12 INCHES OF PRECIPITATION WHICH TIED FOR 4TH WETTEST DECEMBER DAY
ON RECORD.  ON THE 23RD-24TH A SHOT OF COLD AIR ENTERED THE REGION
FROM THE NORTH WITH SEVERAL NORTHERN VALLEY LOCATIONS BELOW 0F. THIS
INCLUDES -10F AROUND REPUBLIC AND IONE, -5 NAPLES, AND -4F IN
PORTHILL AND DEER PARK.  ON THE 28TH AND 29TH A PAIR OF STORMS
BROUGHT HEAVY SNOW TO THE NORTH IDAHO PANHANDLE...WITH SNOW AND
FREEZING RAIN NORTHERN VALLEYS AND SPOKANE/COEUR D`ALENE AREA.  SNOW
TOTALS INCLUDE AN IMPRESSIVE 35 INCHES CLARK FORK...17 PRICHARD...16
BONNERS FERRY...12 DEARY AND WALLACE...AND 10 INCHES IN PRIEST
RIVER. A HALF INCH OF ICE ACCUMULATION WAS REPORTED IN
CLAYTON...COEUR D`ALENE.  THE HEAVY WET SNOW AND ICE LED TO SEVERAL
POWER OUTAGES.

RECORD SNOWFALL WAS RECORDED AT THE SPOKANE AIRPORT ON THE 15TH WITH
7.1 INCHES. RECORD PRECIPITATION WAS RECORDED ON THE 19TH WITH 1.12
INCHES.



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