700
CXUS55 KRIW 011655
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1055 AM MDT FRI MAY 01 2026

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

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF APRIL 2026...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2026

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE
                                          NORMAL
..............................................................
TEMPERATURE (F)
RECORD
 HIGH             65   04/29/2007
 LOW             -18   04/13/2022
HIGHEST           63   04/21
LOWEST             3   04/18
AVG. MAXIMUM    42.2               40.9     1.3
AVG. MINIMUM    19.7               16.6     3.1
MEAN            30.9               28.7     2.2
DAYS MAX >= 90     0
DAYS MAX <= 32     4
DAYS MIN <= 32    30
DAYS MIN <= 0      0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        4.59   2011
 MINIMUM        0.76   2008
TOTALS          2.81               2.28    0.53     2.59
DAILY AVG.      0.09               0.08    0.01
DAYS >= .01       16
DAYS >= .10        7
DAYS >= .50        1
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.78   04/15 TO 04/16
 STORM TOTAL    0.56

DEGREE DAYS
HEATING TOTAL   1013               1088     -75
 SINCE 7/1      9042              10651   -1609
COOLING TOTAL      0                  0       0
 SINCE 1/1         0                  0       0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              2.7
RESULTANT WIND SPEED/DIRECTION   0/150
HIGHEST WIND SPEED/DIRECTION    20/270    DATE  04/07
HIGHEST GUST SPEED/DIRECTION    33/260    DATE  04/07

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.00
NUMBER OF DAYS FAIR           30
NUMBER OF DAYS PC              0
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     69

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                4     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW               15     SLEET                      0
FOG                       0     FOG W/VIS <= 1/4 MILE      0
HAZE                      0

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

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