Climatological Report (Monthly)
Issued by NWS Spokane, WA

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000
CXUS56 KOTX 011426 CCA
CLMGEG

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

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

...THE SPOKANE WA 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              98   09/18/1938
 LOW               22   09/23/2000
                        09/24/1926
HIGHEST            94   09/02        MM      MM       83  09/26
LOWEST             37   09/22        MM      MM       40  09/21
AVG. MAXIMUM     73.2              72.9     0.3     71.8
AVG. MINIMUM     51.1              47.4     3.7     47.6
MEAN             62.2              60.2     2.0     59.7
DAYS MAX >= 90      2               1.2     0.8        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.6    -0.6        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.58   1927
 MINIMUM            T   2012
                        1999
TOTALS           1.21              0.67    0.54     0.21
DAILY AVG.       0.04              0.02    0.02     0.01
DAYS >= .01         5               5.1    -0.1        4
DAYS >= .10         4               2.1     1.9        1
DAYS >= .50         1               0.2     0.8        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.62   09/19 TO 09/19           09/17 TO 09/17

SNOWFALL (INCHES)
RECORDS
 TOTAL            1.4   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     166               183     -17      158
 SINCE 7/1        169               248     -79      188
COOLING TOTAL      89                38      51        7
 SINCE 1/1        794               449     345      494
........................................................

WIND (MPH)
AVERAGE WIND SPEED              7.0
HIGHEST WIND SPEED/DIRECTION    30/250    DATE  09/30
HIGHEST GUST SPEED/DIRECTION    47/250    DATE  09/30

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            7
NUMBER OF DAYS PC             12
NUMBER OF DAYS CLOUDY         11

AVERAGE RH (PERCENT)     53

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       2
LIGHT RAIN                8     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       2
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       7     FOG W/VIS <= 1/4 MILE      1
HAZE                     11

-  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
NORTHEAST WASHINGTON AND THE NORTH 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.  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.  RAIN SHOWERS MOVED IN LATE IN THE
EVENING...ENDING SPOKANE AIRPORT DRY STREAK AT 80 DAYS WHICH WAS A
RECORD.  THE 18TH THROUGH THE 21ST WAS MUCH COOLER AND WET. ISOLATED
THUNDERSTORMS ON THE 18TH AND 19TH BROUGHT SMALL HAIL AND BRIEF
HEAVY RAIN.  THE HIGH TEMPERATURE IN SPOKANE ONLY REACHED 48F ON THE
20TH AND 50F ON THE 21ST.  COMPARED THIS TO THE 2ND AND 3RD WHERE
HIGHS WERE IN THE MID 90S. AFTER THE MID-MONTH COOL DOWN...
TEMPERATURES GRADUALLY WARMED ONCE AGAIN AFTER THAT...REACHING THE
70S FROM THE 26TH THROUGH THE 29TH.  ISOLATED THUNDERSTORMS OCCURRED
TO FINISH OUT THE MONTH.  OUTFLOW WINDS HIT THE SPOKANE AIRPORT
IN THE EVENING WITH A PEAK WIND OF 47 MPH.

OTHER THAN THE RECORD DRY STREAK THAT ENDED ON THE SEPTEMBER 17TH AT
80 DAYS...NO ADDITIONAL RECORDS WERE SET DURING THE MONTH AT THE
SPOKANE AIRPORT.


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