Climatological Report (Monthly)
Issued by NWS Spokane, WA

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CXUS46 KOTX 011557
CLMLWS


CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE, WA
748 AM PST WED FEB 1 2017

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

...THE LEWISTON ID AIRPORT CLIMATE SUMMARY FOR THE MONTH OF JANUARY 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1881 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              66   01/09/1953
 LOW              -22   01/31/1950
HIGHEST            46   01/21        MM      MM       56  01/22
LOWEST              4   01/05        MM      MM       11  01/02
AVG. MAXIMUM     31.5              41.6   -10.1     43.6
AVG. MINIMUM     20.8              29.6    -8.8     31.3
MEAN             26.1              35.6    -9.5     37.5
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     13               4.4     8.6        2
DAYS MIN <= 32     28              17.8    10.2       18
DAYS MIN <= 0       0               0.1    -0.1        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.56   1883
 MINIMUM         0.11   2007
TOTALS           0.81              1.08   -0.27     0.93
DAILY AVG.       0.03              0.03    0.00     0.03
DAYS >= .01        10              10.0     0.0       12
DAYS >= .10         4               3.2     0.8        5
DAYS >= .50         0               0.3    -0.3        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.20   01/18 TO 01/18           01/23 TO 01/24

SNOWFALL (INCHES)
RECORDS
 TOTAL           26.1   1957
TOTALS            6.7               2.4     4.3      0.5
SINCE 7/1        26.4               7.7    18.7      6.2
SNOWDEPTH AVG.      1                 2      -1        0
DAYS >= 1.0         3               0.8     2.2        0
GREATEST
 SNOW DEPTH         3   01/13                          1  01/01
                        01/12
 24 HR TOTAL      2.5   01/31 TO 01/31           01/24 TO 01/24

DEGREE_DAYS
HEATING TOTAL    1196               911     285      846
 SINCE 7/1       3263              3119     144     2676
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0
.....................................................

WIND (MPH)
AVERAGE WIND SPEED              5.4
HIGHEST WIND SPEED/DIRECTION    30/150    DATE  01/17
HIGHEST GUST SPEED/DIRECTION    35/170    DATE  01/17

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            6
NUMBER OF DAYS PC              7
NUMBER OF DAYS CLOUDY         18

AVERAGE RH (PERCENT)     76

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                3     FREEZING RAIN              0
LT FREEZING RAIN          1     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW               14     SLEET                      0
FOG                      17     FOG W/VIS <= 1/4 MILE      1
HAZE                      3

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

$$

JANUARY 2017 WAS VERY WINTER LIKE ACROSS SOUTHEAST WASHINGTON INTO
THE SOUTH IDAHO PANHANDLE.  THE FIRST HALF OF THE MONTH FEATURED
PERIODS OF VERY COLD TEMPERATURES AS ARCTIC AIR INVADED THE REGION
FROM THE 2ND THROUGH THE 6TH AND AGAIN FROM THE 12TH THROUGH THE
16TH.  PULLMAN REPORTED EIGHT DAYS OF BELOW ZERO TEMPERATURES DURING
THIS STRETCH WITH THE COLDEST READING WITH THE COLDEST READING -5F.
WHILE LEWISTON DID NOT DROP BELOW ZERO...THERE WERE FIVE DAYS OF LOW
TEMPERATURES IN THE SINGLE DIGITS.

IN BETWEEN THESE PERIODS OF VERY COLD...GENERALLY DRY
WEATHER...PACIFIC MOISTURE ENTERED THE PICTURE BRINGING SNOW ON NEW
YEARS DAY...AND AGAIN FROM THE 7TH THROUGH THE 9TH.  THE NEW YEARS
DAY SNOW BROUGHT VARIABLE AMOUNTS OF SNOW AS A COLD...UNSTABLE AIR
MASS MOVES OVERHEAD.  LEWISTON ONLY RECORDED 0.3 INCHES BUT MOSCOW
REPORTED 4 INCHES. AS THE INLAND NORTHWEST TRANSITIONED OUT OF THE
DEEP FREEZE...A SIGNIFICANT SHOT OF PRECIPITATION ENTERED THE REGION
FROM THE SOUTHWEST ON THE 17TH AND 18TH.  THIS BROUGHT AREAS OF
FREEZING RAIN WITH KENDRICK AND JULIETTA HARDEST HIT WAS FREEZING
RAIN REPORTS OF 0.12-0.50 INCHES. THE COLUMBIA BASIN WAS HARDEST HIT
WHERE AN ICE STORM BROUGHT FREEZING RAIN ACCUMULATIONS UP TO THREE
QUARTERS OF AN INCH.

QUIETER WEATHER OCCURRED AFTER THE 19TH AS HIGH PRESSURE SLOWLY
BUILT OVER THE REGION BY THE END OF THE MONTH.  TEMPERATURES EVEN
CLIMBED ABOVE FREEZING IN THE VALLEYS...WITH LEWISTON EVEN WARMING
INTO THE LOWER TO MID 40S FROM THE 19TH THROUGH THE 22ND.  THE
PATTERN YET CHANGED AGAIN AT THE VERY END OF THE MONTH...WITH A
COLDER AIR MASS COMBINED WITH INCREASED MOISTURE WITH 2.5 INCHES
FALLING AT THE LEWISTON AIRPORT WITH 6 INCHES IN COLFAX.

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


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