100
CXUS55 KRIW 011740
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1122 AM MDT TUE OCT 01 2024

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE
MONTH OF SEPTEMBER 2024...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF SEPTEMBER 2024 WILL BE
AVAILABLE APPROXIMATELY IN 60 DAYS FROM THE NATIONAL CENTERS FOR
ENVIRONMENTAL INFORMATION (HTTP://WWW.NCDC.NOAA.GOV/CDO-
WEB/DATASETS). UNOFFICIAL ASOS DAILY SUMMARIES ARE AVAILABLE ON THE
INTERNET AT HTTP://WWW.WEATHER.GOV/CLIMATE/INDEX.PHP?WFO=RIW

...LAKE YELLOWSTONE WAS WARMER AND DRIER THAN NORMAL IN SEPTEMBER...

AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN SEPTEMBER WAS 48.7
DEGREES WHICH IS 3.3 DEGREES ABOVE NORMAL. IT WAS THE 4TH WARMEST
SEPTEMBER SINCE RECORDS BEGAN IN 1998. THE WARMEST READING OF THE
MONTH WAS 79 DEGREES ON THE 1ST. THE HIGH ON THE 28TH OF 73 DEGREES
TIED THE 2010 RECORD. THE 29TH HIGH OF 72 DEGREES BROKE THE 2010
RECORD OF 70. COLDEST READING OF THE MONTH WAS 26 DEGREES ON THE
22ND.

TOTAL PRECIPITATION AT LAKE YELLOWSTONE WAS 1.43 INCHES...WHICH WAS
91 PERCENT OF NORMAL. THE WETTEST 24-HOUR PERIOD DURING THE MONTH
WAS THE 17TH WHEN 0.56 INCHES OF PRECIPITATION FELL. NO
PRECIPITATION RECORDS WERE BROKEN THIS MONTH. THE HIGHEST WIND GUST
WAS 35 MPH FROM THE NORTHWEST ON THE 11TH.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF
SEPTEMBER 2024...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2024

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE
                                          NORMAL
..............................................................
TEMPERATURE (F)
RECORD
 HIGH             83   09/07/2022
 LOW              13   09/24/2000
HIGHEST           79   09/01
LOWEST            25   09/30
AVG. MAXIMUM    64.8               60.5     4.3
AVG. MINIMUM    32.6               30.3     2.3
MEAN            48.7               45.4     3.3
DAYS MAX >= 90     0
DAYS MAX <= 32     0
DAYS MIN <= 32    16
DAYS MIN <= 0      0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        4.09   2013
 MINIMUM        0.21   2018
TOTALS          1.43               1.57   -0.14     3.62
DAILY AVG.      0.05               0.05   -0.00
DAYS >= .01        6
DAYS >= .10        5
DAYS >= .50        1
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.56   09/17 TO 09/17
 STORM TOTAL    0.56

DEGREE DAYS
HEATING TOTAL    479                588    -109
 SINCE 7/1      1056               1230    -174
COOLING TOTAL      0                  0       0
 SINCE 1/1         0                  0       0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              2.4
RESULTANT WIND SPEED/DIRECTION   0/340
HIGHEST WIND SPEED/DIRECTION    18/280    DATE  09/11
HIGHEST GUST SPEED/DIRECTION    35/290    DATE  09/11

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)     62

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                6     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     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.

LOOKING AHEAD TO OCTOBER 2024. THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 53 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 27 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 39
DEGREES AND THE AVERAGE LOW TEMPERATURE IS 17 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 1.85 INCHES.

$$