Climatological Report (Monthly)
Issued by NWS Spokane, WA

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CXUS46 KOTX 030244 CCA
CLMLWS

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

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

...THE LEWISTON ID 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              67   12/12/1921
 LOW              -23   12/13/1919
HIGHEST            51   12/30        MM      MM       51  12/03
LOWEST              8   12/24        MM      MM        0  12/18
                                                          12/17
AVG. MAXIMUM     36.1              39.5    -3.4     34.6
AVG. MINIMUM     26.1              28.0    -1.9     22.7
MEAN             31.1              33.7    -2.6     28.7
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     11               5.5     5.5       12
DAYS MIN <= 32     26              20.6     5.4       30
DAYS MIN <= 0       0               0.2    -0.2        2

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.88   1882
 MINIMUM         0.14   1970
TOTALS           2.63              0.97    1.66     1.59
DAILY AVG.       0.08              0.03    0.05     0.05
DAYS >= .01        13              10.6     2.4       15
DAYS >= .10         6               3.7     2.3        7
DAYS >= .50         1               0.1     0.9        0
DAYS >= 1.00        1               0.0     1.0        0
GREATEST
 24 HR. TOTAL    1.33   12/29 TO 12/29           12/14 TO 12/15

SNOWFALL (INCHES)
RECORDS
 TOTAL           19.7   2016
TOTALS           13.0               3.5     9.5     19.7
SINCE 7/1        13.0               5.3     7.7     19.7
SNOWDEPTH AVG.      1                 1       0        2
DAYS >= 1.0         5               1.6     3.4        7
GREATEST
 SNOW DEPTH         6   12/28                          8  12/17
                                                          12/16
                                                          12/15
 24 HR TOTAL      4.2   12/22 TO 12/22           12/14 TO 12/14

DEGREE_DAYS
HEATING TOTAL    1042               968      74     1118
 SINCE 7/1       2208              2208       0     2067
COOLING TOTAL       0                 0       0        0
 SINCE 1/1       1160               807     353      863
.....................................................

WIND (MPH)
AVERAGE WIND SPEED              3.5
HIGHEST WIND SPEED/DIRECTION    31/170    DATE  12/18
HIGHEST GUST SPEED/DIRECTION    37/180    DATE  12/18

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC             10
NUMBER OF DAYS CLOUDY         17

AVERAGE RH (PERCENT)     84

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       2
LIGHT RAIN                8     FREEZING RAIN              1
LT FREEZING RAIN          1     HAIL                       0
HEAVY SNOW                0     SNOW                       2
LIGHT SNOW               12     SLEET                      0
FOG                      19     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 BROUGHT WETTER AND COLDER THAN NORMAL CONDITIONS TO
SOUTHEAST WASHINGTON AND THE SOUTH 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. THE SECOND HALF OF THE MONTH WAS
MUCH MORE ACTIVE ON THE 15TH A TROUGH DROPPED IN FROM NORTHWEST
BRINGING 6 INCHES OF SNOW TO PULLMAN AND 2.5 INCHES IN LEWISTON.
ANOTHER COLD STORM HIT THE AREA ON THE 22ND WITH 4 INCHES OF SNOW IN
LEWISTON, WITH 7 INCHES ON THE CAMAS PRAIRIE IN CRAIGMON.  ON THE
23RD AND 24TH A SHOT OF COLD AIR HIT THE AREA WITH PULLMAN DROPPING
DOWN TO 2F ON THE 23RD.  THE 28TH AND 29TH BROUGHT A VERY WET PERIOD
WITH SE WASHINGTON AND THE LEWISTON AREA ON THE WARM SIDE OF A
STALLED FRONTAL BOUNDARY.  AFTER A HIGH TEMPERATURE OF ONLY 19F IN
LEWISTON ON THE 24TH HIGHS ON THE 30TH REACHED 51F. HEAVY RAIN AND
SNOW MELT LED TO MINOR FLOODING ON PARADISE CREEK IN MOSCOW.  A
MUDSLIDE 2-4 FEET DEEP AND 30 FEET WIDE ALSO OCCURRED NEAR PECK.
ANOTHER MUDSLIDE 4 MILES WEST OF KAMIAH CLOSED STATE HIGHWAY 64.  2
DAY RAIN TOTALS INCLUDE 2.73 INCHES NEAR PALOUSE...2.35 MOSCOW...
2.18 THORNTON...2.24 PULLMAN AND 1.33 LEWISTON.

THE 1.33 INCHES IN LEWISTON BROKE A RAINFALL RECORD FOR THE 29TH...
AND WAS THE 2ND WETTEST DECEMBER DAY ON RECORD.


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