Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 012333
CLMLND

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
433 PM MST MON JAN 1 2018

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR THE HUNT FIELD IN LANDER
FOR THE MONTH OF DECEMBER 2017...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF DECEMBER 2017 WILL BE
AVAILABLE APPROXIMATELY IN FEBRUARY 2018 FROM THE NATIONAL CENTER
FOR ENVIRONMENTAL INFORMATION (HTTP://WWW.NCEI.NOAA.GOV/OL/
CLIMATEDATA.HTML). UNOFFICIAL ASOS DAILY SUMMARIES ARE AVAILABLE ON
THE INTERNET AT HTTP://WWW.WEATHER.GOV/CLIMATE/INDEX.PHP?WFO=RIW

...DECEMBER WAS WETTER THAN NORMAL IN LANDER...

THE AVERAGE TEMPERATURE FOR LANDER IN OCTOBER WAS 22.0 DEGREES...
WHICH WAS 1.3 DEGREES ABOVE NORMAL. THE WARMEST READING OF THE MONTH
WAS 56 DEGREES ON THE 3RD. THE COLDEST READING WAS -10 DEGREES ON THE
24TH. NO TEMPERATURE RECORDS WERE SET DURING THE MONTH.

TOTAL PRECIPITATION FOR THE MONTH WAS 1.23 INCHES...WHICH WAS 212
PERCENT OF NORMAL, OR 0.65 INCHES ABOVE NORMAL. THIS MAKES IT THE
8TH WETTEST DECEMBER ON RECORD. THE WETTEST 24 HOUR PERIOD DURING
THE MONTH WAS ON THE 20TH...WHEN 0.33 INCHES FELL. NO PRECIPITATION
RECORDS WERE SET DURING THE MONTH. THE TOTAL SNOWFALL FOR NOVEMBER
WAS 18.4 INCHES. THE SNOWIEST DAY WAS ON THE 20TH WHEN 4.2 INCHES
OF SNOW FELL.
THE HIGHEST WIND GUST WAS 49 MPH ON THE 3RD.

...THE LANDER WY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1891 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              65   12/11/1937
                        12/10/1933
 LOW              -40   12/19/1924
HIGHEST            56   12/03
LOWEST            -10   12/24
AVG. MAXIMUM     33.8              31.8     2.0
AVG. MINIMUM     10.2               9.6     0.6
MEAN             22.0              20.7     1.3
DAYS MAX >= 90      0
DAYS MAX <= 32     11
DAYS MIN <= 32     31
DAYS MIN <= 0       8

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         2.06   1909
 MINIMUM            T   1933
                        1931
                        1910
TOTALS           1.23              0.58    0.65
DAILY AVG.       0.04              0.02    0.02
DAYS >= .01         7
DAYS >= .10         6
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.33   12/20 TO 12/20

SNOWFALL (INCHES)
TOTALS           18.4              10.1     8.3
SINCE 7/1        26.4              35.7    -9.3
SNOWDEPTH AVG.      3
DAYS >= 1.0         7

DEGREE_DAYS
HEATING TOTAL    1324              1373     -49
 SINCE 7/1       2924              3246    -322
COOLING TOTAL       0                 0       0
 SINCE 1/1        292               472    -180
.................................................

WIND (MPH)
AVERAGE WIND SPEED              4.7
RESULTANT WIND SPEED/DIRECTION   1/264
HIGHEST WIND SPEED/DIRECTION    41/190    DATE  12/03
HIGHEST GUST SPEED/DIRECTION    49/210    DATE  12/03

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.20
NUMBER OF DAYS FAIR           23
NUMBER OF DAYS PC              5
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     69

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                1     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       4
LIGHT SNOW               10     SLEET                      0
FOG                      12     FOG W/VIS <= 1/4 MILE      2
HAZE                      2

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

LOOKING AHEAD TO JANUARY 2018...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 32 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 9 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 33
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 11. THE AVERAGE MONTHLY
PRECIPITATION IS 0.41 INCHES.

$$



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