582
CXUS46 KOTX 011318
CLMLWS

CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
618 AM PDT THU OCT 01 2026

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

...THE LEWISTON ID AIRPORT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 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            108   09/06/1944
 LOW              27   09/24/1926
HIGHEST           88   09/10         MM      MM      102  09/01
                                                          09/02
LOWEST            41   09/28         MM      MM       48  09/23
                                                          09/27
AVG. MAXIMUM    74.9               79.5    -4.6     84.8
AVG. MINIMUM    51.6               52.3    -0.7     57.9
MEAN            63.3               65.9    -2.7     71.4
DAYS MAX >= 90     0                4.4    -4.4        8
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          1.63               0.60    1.03     1.24
DAILY AVG.      0.05               0.02    0.03     0.04
DAYS >= .01       10                4.7     5.3        9
DAYS >= .10        2                1.8     0.2        3
DAYS >= .50        2                0.2     1.8        1
DAYS >= 1.00       0                0.0     0.0        0
GREATEST
 24 HR. TOTAL   0.74   09/12 TO 09/13               0.53

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      MM                                 0.0

DEGREE DAYS
HEATING TOTAL     86                 76      10       14
 SINCE 7/1        87                 88      -1       MM
COOLING TOTAL     39                102     -63      211
 SINCE 1/1       913                908       5       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              4.5
HIGHEST WIND SPEED/DIRECTION    30/300    DATE  09/12
                                30/240          09/25
HIGHEST GUST SPEED/DIRECTION    43/300    DATE  09/12

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.20
NUMBER OF DAYS FAIR           21
NUMBER OF DAYS PC              7
NUMBER OF DAYS CLOUDY          2

AVERAGE RH (PERCENT)     57

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       2
LIGHT RAIN               11     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.

$$