Climatological Report (Annual)
Issued by NWS Spokane, WA

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092
CXUS55 KOTX 172120 CCA
CLALWS

CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE, WA
1100 AM PST TUE JAN 2 2018

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

...THE LEWISTON ID AIRPORT CLIMATE SUMMARY FOR THE YEAR OF 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1881 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH             117   07/27/1939
 LOW              -23   12/13/1919
HIGHEST           105   08/29
LOWEST              4   01/05
AVG. MAXIMUM     63.2              63.5    -0.3
AVG. MINIMUM     42.6              42.5     0.1
MEAN             52.9              53.0    -0.1
DAYS MAX >= 90     62              40.1    21.9
DAYS MAX <= 32     26              12.7    13.3
DAYS MIN <= 32     86              75.9    10.1
DAYS MIN <= 0       0               0.7    -0.7

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        21.76   1884
 MINIMUM         7.73   2007
TOTALS          16.52             12.31    4.21
DAILY AVG.       0.05              0.03    0.02
DAYS >= .01       118             102.8    15.2
DAYS >= .10        60              39.7    20.3
DAYS >= .50         3               3.1    -0.1
DAYS >= 1.00        1               0.2     0.8
GREATEST
 24 HR. TOTAL    1.33   MM

SNOWFALL (INCHES)
RECORDS
 TOTAL           62.2   1916
TOTALS           32.5              10.5    22.0
DAYS >= TRACE      40              10.6    29.4
DAYS >= 1.0        13               3.9     9.1
GREATEST
 24 HR TOTAL      4.2   MM

DEGREE_DAYS
HEATING TOTAL    5421              5167     254
COOLING TOTAL    1160               807     353

FREEZE DATES
RECORD
 EARLIEST     09/17/1965
 LATEST       05/12/1985
EARLIEST                        10/24
LATEST                          04/07
.................................................

WIND (MPH)
AVERAGE WIND SPEED              5.0
HIGHEST WIND SPEED/DIRECTION    41/220    DATE  04/07
HIGHEST GUST SPEED/DIRECTION    56/220    DATE  04/07

SKY COVER
AVERAGE SKY COVER           0.40

AVERAGE RH (PERCENT)     61

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              9     MIXED PRECIP              MM
HEAVY RAIN                3     RAIN                      29
LIGHT RAIN              127     FREEZING RAIN              2
LT FREEZING RAIN          3     HAIL                       0
HEAVY SNOW                1     SNOW                       8
LIGHT SNOW               38     SLEET                     MM
FOG                     113     FOG W/VIS <= 1/4 MILE     36
HAZE                     43

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

$$



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