Climatological Report (Monthly)
Issued by NWS Spokane, WA

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059
CXUS46 KOTX 012129
CLMLWS

CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
1050 AM PST SUN NOV 01 2020

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

...THE LEWISTON ID AIRPORT CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2020...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1881 TO 2020

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           85   10/07         MM      MM       76  10/07
LOWEST            21   10/26         MM      MM       16  10/30
AVG. MAXIMUM    64.4               62.6     1.8     57.9
AVG. MINIMUM    42.2               41.1     1.1     37.3
MEAN            53.3               51.8     1.5     47.6
DAYS MAX >= 90     0                0.0     0.0        0
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     7                2.4     4.6       10
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        3.24   1940
 MINIMUM           T   1987
TOTALS          0.92               0.96   -0.04     0.91
DAILY AVG.      0.03               0.03   -0.00     0.03
DAYS >= .01        7                7.9    -0.9        9
DAYS >= .10        2                3.3    -1.3        3
DAYS >= .50        1                0.2     0.8        0
DAYS >= 1.00       0                0.0     0.0        0
GREATEST
 24 HR. TOTAL   0.52   10/23 TO 10/24               0.40

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

DEGREE DAYS
HEATING TOTAL    373                411     -38      532
 SINCE 7/1       404                524    -120      626
COOLING TOTAL     16                  3      13        0
 SINCE 1/1       943                807     136      964
................................................................

WIND (MPH)
AVERAGE WIND SPEED              4.9
HIGHEST WIND SPEED/DIRECTION    36/250    DATE  10/13
HIGHEST GUST SPEED/DIRECTION    51/260    DATE  10/13

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.31
NUMBER OF DAYS FAIR           17
NUMBER OF DAYS PC             10
NUMBER OF DAYS CLOUDY          4

AVERAGE RH (PERCENT)     57

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       2
LIGHT RAIN               10     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      2
HAZE                      7

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

$$

OCTOBER 2020 BROUGHT NEAR NORMAL TEMPERATURES AND ABOVE NORMAL
PRECIPITATION TO SOUTHEAST WASHINGTON INTO THE SOUTH IDAHO
PANHANDLE. WHILE TEMPERATURES WERE CLOSER TO NORMAL WHILE AVERAGING
THE ENTIRE MONTH, THERE WERE MAJOR TEMPERATURE SWINGS AND
SIGNIFICANT WEATHER EVENTS INCLUDING HIGH WINDS AND SNOW. THE MONTH
STARTED OFF DRY AND MILD WITH HIGH TEMPERATURES IN THE UPPER 70S TO
MID 80S. THIS CAME TO AN END OF THE 10TH WITH A WET COLD FRONT
PASSAGE.  ON THE 12TH WINDY CONDITIONS ARRIVED EARLY IN THE MORNING
WITH A PEAK WIND OF 68 MPH AT ALDER RIDGE IN THE BLUE MOUNTAINS, 54
MPH ALPOWA SUMMIT, AND 45 MPH IN LEWISTON.  NEXT CAME THE TWO MAJOR
WEATHER EVENTS OF THE MONTH.

ON THE 13TH A DEEP LOW TRACKED ACROSS SOUTHERN BRITISH COLUMBIA
BRINGING HIGH WINDS TO THE REGION. RAIN AND HIGH MOUNTAIN SNOW IN
THE MORNING WAS THEN FOLLOWED BY ISOLATED THUNDERSTORMS IN THE
AFTERNOON AROUND KELLOGG. PEAK WIND GUSTS FROM THE EVENT INCLUDE 69
MPH CORRAL CREEK, 62 MPH SILCOTT ISLAND, 51 MPH LEWISTON, AND 50 MPH
IN PULLMAN. SOME DOWNED TREES AND POWER OUTAGES WERE REPORTED IN
PULLMAN.

COOLER AND DRIER AIR ON THE 21ST AND 22ND SET THE STAGE FOR SNOW IN
SOME AREAS ON THE 23RD.  MILDER AIR SNEAKING INTO THE BLUE
MOUNTAINS, LC VALLEY, AND PULLMAN/MOSCOW AREAS KEPT SNOW AMOUNTS
LIGHT AND MAINLY ABOVE 2000 FEET. HIGHER AMOUNTS OCCURRED NORTH AND
EAST OF MOSCOW WITH 5 INCHES IN POTLATCH AND GARFIELD AND 7 INCHES
IN KELLOGG. COLD TEMPERATURES FOLLOWED IN LEWISTON WITH HIGHS FROM
THE 24TH THROUGH THE 26TH IN THE MID TO UPPER 30S AT THE LEWISTON
AIRPORT WITH LOWS DROPPING INTO THE LOW 20S. BUT COLDER POCKETS WERE
OBSERVED WITH 7F IN KELLOGG AND 9F IN MOSCOW. A QUICK WARMUP
FOLLOWED WITH TEMPERATURES BACK UP TO NEAR 60F IN LEWISTON ON THE
29TH. A STRONG COLD FRONT ON THE 30TH BROUGHT WINDY CONDITIONS WITH
GUSTS 40-45 MPH ON THE PALOUSE. THE WINDS ALSO PICKED UP AREAS OF
BLOWING DUST IN THE COLUMBIA BASIN WHICH TRACKED INTO SOUTHEAST
WASHINGTON AND NORTH IDAHO AS WELL.

IN ADDITION TO THE SNOWFALL RECORDS MENTIONED ABOVE, LEWISTON SET A
NEW LOW TEMPERATURE RECORD OF 22F ON THE 25TH...AND 21F ON THE 26TH.



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