166
CXUS46 KOTX 011828
CLMLWS

CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
1128 AM PDT MON JUN 01 2026

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

...THE LEWISTON ID AIRPORT CLIMATE SUMMARY FOR THE MONTH OF MAY 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
................................................................
TEMPERATURE (F)
RECORD
 HIGH            104   05/28/1934
 LOW              23   05/01/1954
HIGHEST           90   05/12         MM      MM       94  05/28
LOWEST            41   05/17         MM      MM       40  05/06
                       05/18
AVG. MAXIMUM    75.7               72.0     3.7     75.4
AVG. MINIMUM    49.3               48.1     1.2     48.8
MEAN            62.5               60.0     2.5     62.1
DAYS MAX >= 90     1                1.0     0.0        3
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        3.78   1978
 MINIMUM           T   1924
TOTALS          0.77               1.69   -0.92     0.51
DAILY AVG.      0.02               0.05   -0.03     0.02
DAYS >= .01        6               10.6    -4.6        7
DAYS >= .10        3                5.6    -2.6        2
DAYS >= .50        0                0.6    -0.6        0
DAYS >= 1.00       0                0.1    -0.1        0
GREATEST
 24 HR. TOTAL   0.30   05/25 TO 05/26               0.18

SNOWFALL (INCHES)
RECORDS
 TOTAL           0.3   1916
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                                  MM

DEGREE DAYS
HEATING TOTAL    104                187     -83      134
 SINCE 7/1      4159               4921    -762       MM
COOLING TOTAL     35                 34       1       51
 SINCE 1/1        35                 36      -1       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              5.4
HIGHEST WIND SPEED/DIRECTION    31/300    DATE  05/13
HIGHEST GUST SPEED/DIRECTION    46/300    DATE  05/13

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.23
NUMBER OF DAYS FAIR           22
NUMBER OF DAYS PC              7
NUMBER OF DAYS CLOUDY          2

AVERAGE RH (PERCENT)     51

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

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

$$

MAY 2026 FINISHED WITH ABOVE NORMAL TEMPERATURES AND BELOW NORMAL
PRECIPITATION FOR SOUTHEAST WASHINGTON INTO THE SOUTH IDAHO
PANHANDLE, WITH SEVERAL SPRING TIME COLD FRONTS DELIVERING WINDY
CONDITIONS WITH 30-45 MPH WIND GUSTS. VERY WARM AND DRY WEATHER
STARTED OFF THE MONTH FROM THE 1ST THROUGH THE 12TH. 6 OF THESE DAYS
HIGHS REACHED THE LOW 80S IN LEWISTON, WITH THE 12TH THE WARMEST DAY
WITH 90F. THEN FROM THE 13TH THROUGH THE 17TH A WEATHER SYSTEM
USHERING IN WINDY CONDITIONS, RAIN SHOWERS, THUNDERSTORMS AND MUCH
COOLER TEMPERATURES WITH HIGH TEMPERATURES IN LEWISTON DROPPING INTO
THE 60S, WITH 50S ON THE PALOUSE. MOST OF THE THUNDERSTORM ACTIVITY
OCCURRED ON THE 16TH ON THE WASHINGTON PALOUSE WEST OF PULLMAN AND
COLFAX.  THEN FROM THE 22ND THROUGH THE 25TH ANOTHER WARM DRY SPELL
ARRIVED WITH HIGH TEMPERATURES BACK INTO THE 80S FOR THE LEWISTON
AREA.  ANOTHER QUICK DROP IN TEMPERATURES ARRIVED ON THE 26TH WITH
HIGHS ONLY IN THE 50S WITH RAIN.

THEN THE 28TH BROUGHT A VERY ACTIVE DAY TO THE INLAND NORTHWEST AS
SEVERE THUNDERSTORMS ARRIVED. AN UNSTABLE ATMOSPHERE COMBINED WITH
AN INCOMING SHORT WAVE TRIGGERED ABUNDANT THUNDERSTORM ACTIVITY WITH
SOME STORMS SEVERE. QUARTER SIZED HAIL WAS REPORTED IN KAMIAH,
BOVILL, CLARKIA, AND SANTA. IN PINEHURST NICKEL SIZED HAIL FELL. IN
TEKOA AND SANDERS, FLASH FLOODING OCCURRED WITH WATER FLOWING OVER
ROADS MAKING SOME ROADS IMPASSABLE. TEKOA RECORD 2 INCHES OF RAIN IN
ONE HOUR.

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