Climatological Report (Monthly)
Issued by NWS Spokane, WA
Issued by NWS Spokane, WA
609
CXUS46 KOTX 011246
CLMLWS
CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
546 AM PDT FRI MAY 01 2026
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...THE LEWISTON ID AIRPORT CLIMATE SUMMARY FOR THE MONTH OF APRIL 2026...
CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1881 TO 2026
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
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TEMPERATURE (F)
RECORD
HIGH 98 04/28/1939
LOW 20 04/19/1966
HIGHEST 78 04/20 MM MM 80 04/25
LOWEST 32 04/25 MM MM 32 04/01
AVG. MAXIMUM 64.1 62.3 1.8 65.7
AVG. MINIMUM 40.4 40.7 -0.3 40.7
MEAN 52.3 51.5 0.8 53.2
DAYS MAX >= 90 0 0.0 0.0 0
DAYS MAX <= 32 0 0.0 0.0 0
DAYS MIN <= 32 1 2.4 -1.4 1
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 3.29 1978
MINIMUM 0.05 2021
TOTALS 2.24 1.44 0.80 0.58
DAILY AVG. 0.07 0.05 0.02 0.02
DAYS >= .01 7 11.3 -4.3 6
DAYS >= .10 4 4.5 -0.5 1
DAYS >= .50 2 0.3 1.7 0
DAYS >= 1.00 0 0.0 0.0 0
GREATEST
24 HR. TOTAL 1.37 04/12 TO 04/13 0.38
SNOWFALL (INCHES)
RECORDS
TOTAL 1.1 1972
TOTALS 0.0 0.0 0.0 0.0
SINCE 7/1 0.1 12.7 -12.6 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 376 407 -31 347
SINCE 7/1 4055 4732 -677 MM
COOLING TOTAL 0 2 -2 0
SINCE 1/1 0 2 -2 MM
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WIND (MPH)
AVERAGE WIND SPEED 5.8
HIGHEST WIND SPEED/DIRECTION 32/300 DATE 04/07
HIGHEST GUST SPEED/DIRECTION 46/290 DATE 04/07
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.30
NUMBER OF DAYS FAIR 19
NUMBER OF DAYS PC 5
NUMBER OF DAYS CLOUDY 6
AVERAGE RH (PERCENT) 58
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 2 MIXED PRECIP 0
HEAVY RAIN 2 RAIN 5
LIGHT RAIN 12 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 5 FOG W/VIS <= 1/4 MILE 1
HAZE 0
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
APRIL 2026 FINISHED WETTER AND WARMER THAN NORMAL ACROSS SOUTHEAST
WASHINGTON INTO THE SOUTH IDAHO PANHANDLE. IT WAS A TYPICAL SPRING
MONTH WITH SEVERAL SWINGS OF COOLER TEMPERATURES WITH HIGH
TEMPERATURES DOWN INTO THE 50S FOR THE LC VALLEY AND 40S FOR THE
PALOUSE, FOLLOWED BY WARMER AND DRIER PERIODS WITH HIGHS IN THE 70S.
ON THE 12TH AND 13TH SHOWERS AND THUNDERSTORMS WERE FOLLOWED BY
STEADY RAINS. THUNDERSTORMS ON THE WASHINGTON PALOUSE ON THE 12TH
RESULTED IN SEVERAL ROAD WASHOUTS INCLUDING BANNER, PALOUSE ALBION,
UPPER UNION FLAT CREEK, AND GREEN HOLLOW ROADS. THE STRONGEST STORM
WAS ON GREEN HOLLOW ROAD, 4 MILES SOUTH-SOUTHWEST OF STEPTOE, WITH
LARGE BOULDERS AND MUD FLOWING ACROSS THE ROAD. ON THE 21ST AND 22ND
STRATIFORM RAINS DEVELOPED, AND WERE LOCALLY HEAVY IN THE CENTRAL
PANHANDLE MOUNTAINS WHERE AVERY PICKED UP 2.01 INCHES, AND PECK 0.98
INCHES.
NO RECORDS WERE SET DURING THE MONTH AT THE LEWISTON AIRPORT.
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