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000
CXUS46 KOTX 021944
CLMLWS

CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
1244 PM PDT TUE MAY 02 2023

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

...THE LEWISTON ID AIRPORT CLIMATE SUMMARY FOR THE MONTH OF APRIL 2023...

CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1881 TO 2023

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             98   04/28/1939
 LOW              20   04/19/1966
HIGHEST           89   04/29         MM      MM       75  04/07
LOWEST            29   04/05         MM      MM       27  04/15
AVG. MAXIMUM    62.6               62.3     0.3     57.4
AVG. MINIMUM    39.9               40.7    -0.8     37.3
MEAN            51.3               51.5    -0.3     47.3
DAYS MAX >= 90     0                0.0     0.0        0
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     4                2.4     1.6        6
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        3.29   1978
 MINIMUM        0.05   2021
TOTALS          1.03               1.44   -0.41     1.96
DAILY AVG.      0.03               0.05   -0.02     0.07
DAYS >= .01       11               11.3    -0.3       13
DAYS >= .10        4                4.5    -0.5        5
DAYS >= .50        0                0.3    -0.3        1
DAYS >= 1.00       0                0.0     0.0        0
GREATEST
 24 HR. TOTAL   0.25   04/11 TO 04/11               0.59
                       04/17 TO 04/18

SNOWFALL (INCHES)
RECORDS
 TOTAL           1.1   1972
TOTALS             T                0.0     0.0      0.6
SINCE 7/1       11.9               12.7    -0.8       MM
SNOWDEPTH AVG.     0                                  -1
DAYS >= 1.0        0                0.0     0.0        0
GREATEST
 SNOW DEPTH        0                                  MM  MM
 24 HR TOTAL      MM                                 0.6

DEGREE DAYS
HEATING TOTAL    417                407      10      521
 SINCE 7/1      4819               4732      87       MM
COOLING TOTAL     11                  2       9        0
 SINCE 1/1        11                  2       9       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.4
HIGHEST WIND SPEED/DIRECTION    35/300    DATE  04/16
HIGHEST GUST SPEED/DIRECTION    43/290    DATE  04/16

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.47
NUMBER OF DAYS FAIR           11
NUMBER OF DAYS PC             13
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     56

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       3
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       3     FOG W/VIS <= 1/4 MILE      0
HAZE                      2

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

$$

APRIL 2023 BROUGHT NEAR NORMAL TEMPERATURES AND BELOW NORMAL
PRECIPITATION TO SOUTHEAST WASHINGTON AND THE SOUTH IDAHO PANHANDLE.
THE MONTH BROUGHT A WIDE VARIEY OF WEATHER INCLUDING SNOW, GRAUPEL,
THUNDERSTORMS, AND WARM TEMPERATURES. ON THE 3RD BOTH WINTER AND
SPRING WERE OBSERVED. THE DAY STARTED OFF WITH SNOW ON THE PALOUSE
WITH 2-3 INCHES IN PULLMAN.  THIS WAS FOLLOWED BY ISOLATED
THUNDERSTORMS IN THE AFTERNOON FOR THE UPPER COLUMBIA BASIN AROUND
WASHTUCNA AND OTHELLO. AN ABUNDANCE OF SNOW AND GRAUPEL SHOWERS
OCCURRED IN THE AFTERNOON. A FEW OF THESE WERE HEAVY WITH A QUICK
ACCUMULATION OF GRAUPEL CONTRIBUTING TO ACCIDENTS. NUMEROUS CRASHES
NEAR 4TH OF JULY PASS RESULTING IN AN EXTENDED CLOSURE OF INTERSTATE
90.  ONE DAY LAYER, A SNOW SQUALL HIT I-90 BETWEEN MULLAN AND
LOOKOUT PASS WITH MULTIPLE CRASHES. PERIODS OF COLD SPRING LIKE
SHOWERY WEATHER PERSISTED THROUGH THE 20TH...WITH PULLMAN DROPPING
DOWN INTO THE 20S AT NIGHT ON HALF OF THESE DAYS. THE LAST TIME
PULLMAN HAS MORE THAN 10 DAYS IN THE 20S IN APRIL WAS IN 1970, WITH
FOUR OTHER OCCURRENCES OF 10 DAYS SINCE 1970.  A SIGNIFICANT WARM UP
CLOSED OUT THE MONTH AS STRONG HIGH PRESSURE SET UP OVER THE REGION.
THIS ALLOWED TEMPERATURES TO WARM INTO THE 80S.

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