Climatological Report (Monthly)
Issued by NWS Spokane, WA

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CXUS46 KOTX 011430 CCA
CLMLWS

CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE, WA
126 AM PDT SUN OCT 1 2017

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

...THE LEWISTON ID AIRPORT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 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             108   09/06/1944
 LOW               27   09/24/1926
HIGHEST           100   09/02        MM      MM       91  09/26
LOWEST             37   09/22        MM      MM       42  09/13
AVG. MAXIMUM     78.7              78.2     0.5     76.6
AVG. MINIMUM     53.8              51.0     2.8     52.0
MEAN             66.2              64.6     1.6     64.3
DAYS MAX >= 90      6               3.9     2.1        1
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.1    -0.1        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.37   1940
 MINIMUM            T   2012
                        1999
TOTALS           0.56              0.67   -0.11     0.55
DAILY AVG.       0.02              0.02    0.00     0.02
DAYS >= .01         6               4.9     1.1        6
DAYS >= .10         2               2.3    -0.3        2
DAYS >= .50         0               0.2    -0.2        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.29   09/18 TO 09/18           09/05 TO 09/06

SNOWFALL (INCHES)
RECORDS
 TOTAL              T   1926
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   09/30 TO 09/30           09/30 TO 09/30

DEGREE_DAYS
HEATING TOTAL      95                99      -4       61
 SINCE 7/1         95               114     -19       72
COOLING TOTAL     141                87      54       47
 SINCE 1/1       1160               804     356      863
........................................................

WIND (MPH)
AVERAGE WIND SPEED              4.5
HIGHEST WIND SPEED/DIRECTION    24/310    DATE  09/29
HIGHEST GUST SPEED/DIRECTION    32/300    DATE  09/29

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           17
NUMBER OF DAYS PC              6
NUMBER OF DAYS CLOUDY          7

AVERAGE RH (PERCENT)     50

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       2
LIGHT RAIN                9     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       2     FOG W/VIS <= 1/4 MILE      1
HAZE                      9

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

$$

SEPTEMBER 2017 SURE BROUGHT SOME SIGNIFICANT WEATHER CHANGES TO
SOUTHEAST WASHINGTON AND THE SOUTH IDAHO PANHANDLE.  THE MONTH
STARTED WHERE AUGUST LEFT OFF WITH CONTINUED VERY DRY AND WARM
CONDITIONS WHICH RESULTED IN A CONTINUATION OF NUMEROUS ACTIVE
WILDFIRES ACROSS WASHINGTON...OREGON...MONTANA...AND SOUTHERN
BRITISH COLUMBIA.  LEWISTON EVEN HIT 100 DEGREES ON THE 2ND. THE
MONTANA FIRES WERE ESPECIALLY ACTIVE...AND THUS WHEN THE WINDS
SHIFTED OUT OF THE NORTHEAST ON THE 4TH...EXTENSIVE SMOKE WAS
BROUGHT INTO THE REGION. WIDESPREAD VISIBILITY OF ONE TO THREE MILES
WAS OBSERVED FROM THE 4TH THROUGH THE 7TH.  WINDS SHIFTED ON THE 8TH
AND 9TH WITH SMOKE CLEARING THE REGION...BEFORE RETURNING ON THE
14TH AND 15TH WITH ANOTHER NORTHEAST WIND SHIFT.  THE PATTERN
CHANGED ON THE 17TH...FINALLY BRINGING AN END TO THE SMOKE.  THE
18TH THROUGH THE 20TH WAS MUCH COOLER AND WET. THE HIGH TEMPERATURE
IN LEWISTON ONLY REACHED 55F ON THE 20TH.  AFTER THE MID-MONTH COOL
DOWN...TEMPERATURES GRADUALLY WARMED ONCE AGAIN AFTER
THAT...REACHING THE UPPER 70S TO MID 80S FROM THE 26TH THROUGH THE
29TH.  ISOLATED THUNDERSTORMS OCCURRED ON THE LAST DAY OF THE MONTH
ON THE WASHINGTON PALOUSE...TRACKING FROM ENDICOTT TO COLFAX.

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



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