Climatological Report (Monthly)
Issued by NWS Spokane, WA
Issued by NWS Spokane, WA
278
CXUS46 KOTX 011322
CLMLWS
CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
622 AM PDT WED OCT 01 2025
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...THE LEWISTON ID AIRPORT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2025...
CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1881 TO 2025
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
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TEMPERATURE (F)
RECORD
HIGH 108 09/06/1944
LOW 27 09/24/1926
HIGHEST 102 09/01 MM MM 100 09/01
09/02
09/07
LOWEST 48 09/23 MM MM 41 09/30
09/27
AVG. MAXIMUM 84.8 79.5 5.3 83.0
AVG. MINIMUM 57.9 52.3 5.6 57.0
MEAN 71.4 65.9 5.5 70.0
DAYS MAX >= 90 8 4.4 3.6 9
DAYS MAX <= 32 0 0.0 0.0 0
DAYS MIN <= 32 0 0.0 0.0 0
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 4.37 1940
MINIMUM T 2012
TOTALS 1.24 0.60 0.64 0.82
DAILY AVG. 0.04 0.02 0.02 0.03
DAYS >= .01 9 4.7 4.3 5
DAYS >= .10 3 1.8 1.2 2
DAYS >= .50 1 0.2 0.8 0
DAYS >= 1.00 0 0.0 0.0 0
GREATEST
24 HR. TOTAL 0.53 09/14 TO 09/15 0.59
SNOWFALL (INCHES)
RECORDS
TOTAL T 1926
TOTALS 0.0 0.0 0.0 0.0
SINCE 7/1 0.0 0.0 0.0 MM
SNOWDEPTH AVG. 0 0
DAYS >= 1.0 0 0.0 0.0 0
GREATEST
SNOW DEPTH 0 0 MM
24 HR TOTAL 0.0 MM
DEGREE DAYS
HEATING TOTAL 14 76 -62 25
SINCE 7/1 14 88 -74 MM
COOLING TOTAL 211 102 109 184
SINCE 1/1 1311 908 403 MM
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WIND (MPH)
AVERAGE WIND SPEED 4.3
HIGHEST WIND SPEED/DIRECTION 31/150 DATE 09/10
HIGHEST GUST SPEED/DIRECTION 41/160 DATE 09/10
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.13
NUMBER OF DAYS FAIR 26
NUMBER OF DAYS PC 4
NUMBER OF DAYS CLOUDY 0
AVERAGE RH (PERCENT) 48
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 4 MIXED PRECIP 0
HEAVY RAIN 2 RAIN 3
LIGHT RAIN 10 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 8
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$
SEPTEMBER 2025 FINISHED WITH MUCH ABOVE NORMAL TEMPERATURES FOR
SOUTHEAST WASHINGTON AND THE SOUTH IDAHO PANHANDLE. PRECIPITATION
AMOUNTS VARIED ACROSS THE REGION. THE FIRST FOUR DAYS OF THE MONTH
BROUGHT THE HEAT, WITH LEWISTON REACHED 101 OR 102F FROM THE 1ST
THROUGH THE 3RD. THE FIRST HALF OF THE MONTH ALSO BROUGHT SEVERAL
ROUNDS OF THUNDERSTORMS. ON THE 7TH THUNDERSTORMS PRODUCING ABUNDANT
LIGHTNING ON THE CAMAS PRAIRIE, AND AROUND GENESEE AND KENDRICK ON
THE 8TH A THUNDERSTORM TRACKED THROUGH LEWISTON. ON THE 10TH AND
11TH SCATTERED THUNDERSTORMS TRACKED THROUGH THE REGION.
THE 14TH AND 15TH BROUGHT MUCH COOLER TEMPERATURES WITH SHOWERY
CONDITIONS ALONG WITH ISOLATED THUNDERSTORMS. ON THE 25TH A STRONG
COLD FRONT DELIVERED DRY AND WINDY CONDITIONS WITH SHIRROD HILL AND
ALPOWA SUMMIT GUSTING TO 40 MPH.
THE LEWISTON AIRPORT TIED ONE RECORD DURING THE MONTH ON THE 1ST,
WITH A HIGH TEMPERATURE OF 102.