Climatological Report (Monthly)
Issued by NWS Spokane, WA

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CXUS46 KOTX 011121
CLMLWS


CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE, WA
415 AM PDT TUE MAY 1 2018

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

...THE LEWISTON ID AIRPORT CLIMATE SUMMARY FOR THE MONTH OF APRIL 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              99   04/24/1946
 LOW               20   04/19/1966
HIGHEST            90   04/27        MM      MM       74  04/22
LOWEST             32   04/02        MM      MM       31  04/04
AVG. MAXIMUM     62.8              62.3     0.5     59.8
AVG. MINIMUM     42.0              40.3     1.7     41.0
MEAN             52.4              51.3     1.1     50.3
DAYS MAX >= 90      1               0.0     1.0        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      1               2.2    -1.2        2
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.29   1978
 MINIMUM         0.05   1956
TOTALS           1.82              1.32    0.50     1.98
DAILY AVG.       0.06              0.04    0.02     0.07
DAYS >= .01        14              10.2     3.8       14
DAYS >= .10         6               4.0     2.0        8
DAYS >= .50         0               0.4    -0.4        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.36   04/28 TO 04/28              0.44

SNOWFALL (INCHES)
RECORDS
 TOTAL            1.1   1972
TOTALS              T               0.0     0.0      0.0
SINCE 7/1        14.1              10.5     3.6     39.2
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        T   04/01 TO 04/01               0.0

DEGREE_DAYS
HEATING TOTAL     374               413     -39      402
 SINCE 7/1       4681              4880    -199     5033
COOLING TOTAL       5                 2       3        0
 SINCE 1/1          5                 2       3        0
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.3
HIGHEST WIND SPEED/DIRECTION    45/300    DATE  04/07
HIGHEST GUST SPEED/DIRECTION    61/290    DATE  04/07

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           10
NUMBER OF DAYS PC             16
NUMBER OF DAYS CLOUDY          4

AVERAGE RH (PERCENT)     61

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       3
LIGHT RAIN               16     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                2     SLEET                      0
FOG                       9     FOG W/VIS <= 1/4 MILE      2
HAZE                      1

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

$$

APRIL 2018 BROUGHT NEAR NORMAL TEMPERATURES ALONG WITH WETTER THAN
NORMAL CONDITIONS TO SOUTHEAST WASHINGTON AND THE SOUTH IDAHO
PANHANDLE.  THE FIRST HALF OF THE MONTH WAS ACTIVE WITH SEVERAL
ROUNDS OF VALLEY RAIN AND MOUNTAIN SNOW.  ON THE 7TH A VIGOROUS
FRONTAL PASSAGE AROUND 11 AM BROUGHT HIGH WIND GUSTS WITH 61 MPH
REPORTED IN LEWISTON AND SILCOTT ISLAND WITH 56 MPH IN UNIONTOWN.
A BREAK IN THE WET WEATHER OCCURRED FROM THE 19TH THROUGH THE 27TH
AS STRONG HIGH PRESSURE BROUGHT WARMER TEMPERATURES.  LEWISTON
MANAGED TO REACH 90 DEGREES ON THE 27TH BEFORE A STRONG COLD FRONT
RESULTED IN ONLY 59 DEGREES ON THE 28TH WITH RAIN SHOWERS.

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



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