Climatological Report (Monthly)
Issued by NWS Spokane, WA

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CXUS46 KOTX 011318
CLMLWS


CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE, WA
615 AM PDT WED NOV 1 2017

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

...THE LEWISTON ID AIRPORT CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1881 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              94   10/05/1943
 LOW               15   10/31/2002
HIGHEST            75   10/06        MM      MM       73  10/02
LOWEST             27   10/31        MM      MM       33  10/12
AVG. MAXIMUM     61.7              62.6    -0.9     61.1
AVG. MINIMUM     41.0              41.1    -0.1     46.0
MEAN             51.4              51.8    -0.4     53.6
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      1               2.4    -1.4        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.24   1940
 MINIMUM            T   1987
TOTALS           1.17              0.96    0.21     2.66
DAILY AVG.       0.04              0.03    0.01     0.09
DAYS >= .01         8               7.9     0.1       19
DAYS >= .10         5               3.3     1.7        9
DAYS >= .50         0               0.2    -0.2        1
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.37   10/20 TO 10/20           10/30 TO 10/30
                                                          10/30 TO 10/31
                                                          10/31 TO 10/31

SNOWFALL (INCHES)
RECORDS
 TOTAL            2.5   1971
TOTALS            0.0               0.0     0.0      0.0
SINCE 7/1         0.0               0.0     0.0      0.0
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0               0.0     0.0        0
GREATEST
 SNOW DEPTH         0   MM                             0  MM
 24 HR TOTAL      0.0   10/31 TO 10/31           10/31 TO 10/31
                                                          10/31 TO 10/31
                                                          10/31 TO 10/31

DEGREE_DAYS
HEATING TOTAL     415               411       4      347
 SINCE 7/1        510               525     -15      419
COOLING TOTAL       0                 3      -3        0
 SINCE 1/1       1160               807     353      863
..................................................

WIND (MPH)
AVERAGE WIND SPEED              5.6
HIGHEST WIND SPEED/DIRECTION    37/200    DATE  10/21
HIGHEST GUST SPEED/DIRECTION    47/210    DATE  10/21

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           18
NUMBER OF DAYS PC              8
NUMBER OF DAYS CLOUDY          5

AVERAGE RH (PERCENT)     63

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       4
LIGHT RAIN               11     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       9     FOG W/VIS <= 1/4 MILE      4
HAZE                      6

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

$$

OCTOBER 2017 AS A WHOLE FINISHED SLIGHTLY COOLER AND WETTER THAN
NORMAL ACROSS NORTHEAST WASHINGTON AND NORTH IDAHO PANHANDLE. THE
FIRST 11 DAYS OF THE MONTH WAS UNEVENTFUL EXCEPT FOR WINDY
CONDITIONS ON THE 6TH.  A PEAK WIND OF 51 MPH WAS RECORDED ON ALDER
RIDGE WITH 42 MPH IN POMEROY AND PULLMAN.  SNOW FELL IN DEARY AND
CLARKIA DURING THE OVERNIGHT HOURS.  HIGHWAY 95 OVER MARSH HILL
BECAME SNOW COVERED.  10 TO 12 INCHES FELL IN THE MOUNTAINS AROUND
CLARKIA AND DEARY. ON THE 17TH A STRONG COLD FRONT BROUGHT WINDY
CONDITIONS WITH GUSTS INCLUDING 54 MPH IN THORNTON...52 MPH IN
POMEROY...AND 48 MPH IN PULLMAN. A WET PATTERN DEVELOPED FROM THE
19TH THROUGH THE 22ND WITH THE WETTEST PERIOD LATE ON THE 21ST AND
EARLY ON THE 22ND AS A FETCH OF SUBTROPICAL MOISTURE ASSOCIATED WITH
AN ATMOSPHERIC RIVER BECAME AIMED AT THE AREA. ST. MARIES OBSERVERS
REPORTED NEAR 2 INCHES OF RAIN...WITH 1.41 INCHES IN VIOLA.  WINDY
CONDITIONS OCCURRED ONCE AGAIN ON THE 22ND WITH 57 MPH AT ALDER
RIDGE AND 53 MPH ALPOWA SUMMIT.  THE WEATHER PATTERN BECAME MORE
QUIET TO FINISH OUT THE MONTH.

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


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