Climatological Report (Monthly)
Issued by NWS Spokane, WA

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CXUS46 KOTX 011721
CLMLWS


CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE, WA
854 AM PST TUE JAN 1 2019

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

...THE LEWISTON ID AIRPORT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2018...

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            53   12/20        MM      MM       51  12/30
LOWEST             16   12/07        MM      MM        8  12/24
AVG. MAXIMUM     42.5              39.5     3.0     36.1
AVG. MINIMUM     31.4              28.0     3.4     26.1
MEAN             36.8              33.7     3.1     31.1
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      3               5.5    -2.5       11
DAYS MIN <= 32     15              20.6    -5.6       26
DAYS MIN <= 0       0               0.2    -0.2        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.88   1882
 MINIMUM         0.14   1970
TOTALS           0.80              0.97   -0.17     2.63
DAILY AVG.       0.03              0.03    0.00     0.08
DAYS >= .01        13              10.6     2.4       13
DAYS >= .10         2               3.7    -1.7        6
DAYS >= .50         0               0.1    -0.1        1
DAYS >= 1.00        0               0.0     0.0        1
GREATEST
 24 HR. TOTAL    0.23   12/24 TO 12/24              1.33

SNOWFALL (INCHES)
RECORDS
 TOTAL           19.7   2016
TOTALS            0.5               3.5    -3.0     13.0
SINCE 7/1         0.5               5.3    -4.8     13.0
SNOWDEPTH AVG.      0                 1      -1        1
DAYS >= 1.0         0               1.6    -1.6        5
GREATEST
 SNOW DEPTH         0   MM                             6  12/28
 24 HR TOTAL      0.2   12/29 TO 12/29               4.2

DEGREE_DAYS
HEATING TOTAL     835               968    -133     1042
 SINCE 7/1       1998              2208    -210     2208
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        934               807     127     1160
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.2
HIGHEST WIND SPEED/DIRECTION    33/290    DATE  12/30
HIGHEST GUST SPEED/DIRECTION    42/180    DATE  12/11

SKY COVER
POSSIBLE SUNSHINE (PERCENT)    0
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR           11
NUMBER OF DAYS PC              6
NUMBER OF DAYS CLOUDY         14

AVERAGE RH (PERCENT)     65

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                9     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                5     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      3
HAZE                      0

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

$$

DECEMBER 2018 BROUGHT WARMER AND WETTER THAN NORMAL CONDITIONS FOR
MOST OF SOUTHEAST WASHINGTON INTO THE SOUTH IDAHO PANHANDLE.
EXCEPTION IS THE LEWISTON AREA WHERE PRECIPITATION FINISHED SLIGHTLY
BELOW NORMAL.  THE MONTH STARTED OFF QUIET WITH MAINLY DRY
CONDITIONS FROM THE 1ST THROUGH THE 9TH.  A PERIOD OF COOL WEATHER
SETTLED IN FROM THE 6TH THROUGH THE 8TH WHERE HIGH TEMPERATURES ON
SEVERAL DAYS ONLY REACHED THE UPPER 20S TO LOWER 30S WITH LOWS IN
THE TEENS.  ON THE 7TH LOW CLOUDS AND FREEZING FOG HELD DOWN
TEMPERATURES FROM RITZVILLE TO POMEROY WITH HIGHS ONLY IN THE LOWER
20S.  A WETTER AND MILDER PATTERN THEN SETTLED IN FROM THE 10TH
THROUGH THE 23RD.  IT WAS ESPECIALLY MILD AROUND THE MIDDLE OF THE
MONTH WITH LEWISTON REACHING THE UPPER 40S TO MID 50S ON SEVERAL
DAYS.  A WET AND WINDY SYSTEM ON THE 18TH BROUGHT 1.46 INCHES OF
RAIN NEAR SAINT MARIES WITH NEARLY AN INCH OF RAIN TO PULLMAN WITH A
PEAK WIND GUST OF 48 MPH.

A COOLER PATTERN DEVELOPED AROUND CHRISTMAS. ON THE 23RD AND 24TH
SNOW ACCUMULATED IN SOME HIGHER ELEVATIONS WITH 4 INCHES IN DEARY, 3
INCHES POTLATCH AND 2 INCHES IN PULLMAN.  ON THE 26TH ACCUMULATING
SNOW FELL ABOVE 1500 FEET WITH 1 TO 3 INCHES OF SNOW.  A COMPLEX
STORM SYSTEM ARRIVED TO FINISH OUT THE MONTH.  IT BEGAN WITH SNOW
WITH 2 TO 4 INCHES FALLING ABOVE 1500 FEET WITH JUST A DUSTING OF
SNOW AT THE LEWISTON AIRPORT. THEN MILD SOUTHWEST WINDS SURFACED
WITH TEMPERATURES WARMING INTO THE LOWER 50S IN LEWISTON. WINDS
PEAKED WITH A STRONG AND WILD EVENING COLD FRONT PASSAGE. A
THUNDERSTORM DEVELOPED OVER PULLMAN WITH 0.59 INCHES OF
RAIN IN 2 HOURS.  THE RAIN AND SNOW MELT LED TO SHARP RISES IN SMALL
STREAMS ON THE PALOUSE. PEAK WIND GUSTS INCLUDE 59 MPH IN POMEROY,
48 MPH PULLMAN AIRPORT, AND 40 MPH LEWISTON.

NO RECORDS WERE SET DURING THE MONTH AT THE LEWISTON AIRPORT.



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