584
CDUS45 KRIW 180740
CLIGEY
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1240 AM MST THU DEC 18 2025
...............................
..THE GREYBULL WY CLIMATE SUMMARY FOR DECEMBER 17 2025
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2025
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...............................................................
TEMPERATURE (F)
YESTERDAY
MAXIMUM 59R 12:59 PM 51 1998 30 29 38
MINIMUM 32 10:35 PM -23 2016 7 25 17
AVERAGE 46 19 27 28
PRECIPITATION (IN)
YESTERDAY T R T 2017 0.00 0.00 0.00
2020
2021
MONTH TO DATE 0.20 0.06 0.14 T
SINCE DEC 1 0.20 0.06 0.14 T
SINCE JAN 1 7.03 5.50 1.53 6.28
DEGREE DAYS
HEATING
YESTERDAY 19 46 -27 37
MONTH TO DATE 544 753 -209 602
SINCE DEC 1 544 753 -209 602
SINCE JUL 1 1917 2530 -613 1997
COOLING
YESTERDAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE DEC 1 0 0 0 0
SINCE JAN 1 791 744 47 832
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 53 HIGHEST WIND DIRECTION W (290)
HIGHEST GUST SPEED 70 HIGHEST GUST DIRECTION NW (300)
AVERAGE WIND SPEED 11.9
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.4
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 74 1:00 PM
LOWEST 27 5:00 PM
AVERAGE 51
......................................................
THE GREYBULL WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 30 50 2024
MINIMUM TEMPERATURE (F) 7 -25 2016
SUNRISE AND SUNSET
DECEMBER 18 2025......SUNRISE 7:44 AM MST SUNSET 4:34 PM MST
DECEMBER 19 2025......SUNRISE 7:45 AM MST SUNSET 4:34 PM MST
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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