Climatological Report (Monthly)
Issued by NWS Riverton, WY

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49
000
CXUS55 KRIW 020100
CLMRIW

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

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR RIVERTON REGIONAL AIRPORT
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...

...RIVERTON WAS MUCH WETTER THAN NORMAL IN DECEMBER...

THE AVERAGE TEMPERATURE FOR RIVERTON IN DECEMBER WAS 20.4
DEGREES...WHICH WAS 0.6 DEGREES ABOVE NORMAL. THIS MADE IT THE 10TH
WARMEST DECEMBER ON RECORD. THE WARMEST READING OF THE MONTH WAS 53
DEGREES ON THE 3RD. THE COLDEST READING OF THE MONTH WAS -15 DEGREES
ON THE 24TH. THIS SET A NEW RECORD...BREAKING THE PREVIOUS ONE OF
-12 SET IN 1998. ALSO...-10 DEGREES ON THE 27TH BROKE THE PREVIOUS
RECORD OF -7 SET IN 2007.

TOTAL PRECIPITATION FOR THE MONTH WAS 0.64 INCHES...WHICH WAS 200
PERCENT OF NORMAL. THIS MAKES IT THE 4TH WETTEST DECEMBER ON RECORD.
THE WETTEST 24 HOUR PERIOD WAS ON THE 16TH...WHEN 0.23 OF AN INCH
FELL. THIS BROKE THE PREVIOUS RECORD OF A TRACE SET IN 2005.
SEVERAL OTHER RECORDS WERE ALSO BROKEN:
NEW RECORD (DATE)                          OLD RECORD (YEAR)
0.04 INCHES ON THE 3RD...                 TRACE INCHES (2011)
0.13 INCHES ON THE 4TH...                  0.01 INCHES (2011)
0.04 INCHES ON THE 20TH...                 0.03 INCHES (2007)
0.08 INCHES ON THE 23RD...                 0.05 INCHES (2009)

SNOWFALL FOR DECEMBER WAS 11.6 INCHES. THIS MAKES IT THE 3RD SNOWIEST
DECEMBER ON RECORD. THE MOST SNOW FELL ON THE 16TH...WHEN 2.5 INCHES
FELL...WHICH BROKE THE 2005 RECORD OF A TRACE OF SNOW. SEVERAL OTHER
RECORDS WERE ALSO BROKEN:
NEW RECORD (DATE)                          OLD RECORD (YEAR)
1.5 INCHES ON THE 4TH...                  0.3 INCHES (2011)
1.8 INCHES ON THE 20TH...                 0.4 INCHES (2007)
2.0 INCHES ON THE 23RD TIED...            2.0 INCHES (2009)

THE HIGHEST WIND GUST WAS 41 MPH ON THE 4TH.

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

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1995 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              60   12/02/2012
 LOW              -29   12/21/1998
HIGHEST            53   12/03
LOWEST            -15   12/24
AVG. MAXIMUM     31.6              31.8    -0.2
AVG. MINIMUM      9.1               7.8     1.3
MEAN             20.4              19.8     0.6
DAYS MAX >= 90      0
DAYS MAX <= 32     14
DAYS MIN <= 32     30
DAYS MIN <= 0       8

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         0.77   2016
 MINIMUM            T   1998
                        2001
TOTALS           0.64              0.32    0.32
DAILY AVG.       0.02              0.01    0.01
DAYS >= .01         8
DAYS >= .10         2
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.23   12/16 TO 12/16
 STORM TOTAL       MM
 (MM/DD(HH))

SNOWFALL (INCHES)
TOTALS           11.6                MM      MM
SINCE 7/1        18.9                MM      MM
SNOWDEPTH AVG.      2
DAYS >= 1.0         5

DEGREE_DAYS
HEATING TOTAL    1287              1401    -114
 SINCE 7/1       3121              3317    -196
COOLING TOTAL       0                 0       0
 SINCE 1/1        547               494      53
.................................................

WIND (MPH)
AVERAGE WIND SPEED              6.1
RESULTANT WIND SPEED/DIRECTION   1/309
HIGHEST WIND SPEED/DIRECTION    32/020    DATE  12/20
HIGHEST GUST SPEED/DIRECTION    41/340    DATE  12/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.20
NUMBER OF DAYS FAIR           24
NUMBER OF DAYS PC              4
NUMBER OF DAYS CLOUDY          3

AVERAGE RH (PERCENT)     72

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                0     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       3
LIGHT SNOW               11     SLEET                      0
FOG                      12     FOG W/VIS <= 1/4 MILE      4
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 31 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 7 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 32
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 10. THE AVERAGE MONTHLY
PRECIPITATION IS 0.24 INCHES.

$$


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.