Climatological Report (Monthly)
Issued by NWS

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CXUS55 KRIW 022239
CLMP60

CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
338 PM MST MON NOV 02 2020

...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE
MONTH OF OCTOBER 2020...

...OFFICIAL CLIMATE DATA FOR THE MONTH OF OCTOBER 2020 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 COLDER AND WETTER THAN NORMAL IN OCTOBER...

THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN OCTOBER WAS 33.2
DEGREES...WHICH IS -2.4 DEGREES ABOVE NORMAL. THE WARMEST READING OF
THE MONTH WAS 66 DEGREES ON THE 6TH AND 7TH. THE COLDEST READING WAS
-16 DEGREES ON THE 26TH WHICH ALSO SET A NEW MONTHLY RECORD LOW AS
IT BROKE A 4 RECORD SET IN 2012. THERE WAS SEVERAL DAILY TEMPERATURE
RECORDS BROKEN IN OCTOBER AT LAKE YELLOWSTONE. ON THE 4TH A 65 BROKE
A 62 FROM 2010. THE 6TH 66 BROKE A 64 FROM 2010. THE 7TH SAW A 66
BREAK A 62 FROM 2003. THE 8TH HAD A 65 BREAK A 61 FROM 2014. ON THE
22ND A LOW OF 1 BROKE A 5 SET IN 2006. ON THE 23RD A 0 BROKE A 5 SET
IN 2019. ON THE 25TH A -12 BROKE A 6 FROM 2012. ALSO ON THE 25TH
COLD HIGH OF 14 BROKE A 23 FROM 1997. AND LASTLY A -16 SHATTERED A
RECORD OF 4 SET BACK IN 2012.

TOTAL PRECIPITATION FOR THE MONTH WAS 2.14 INCHES...WHICH WAS 159
PERCENT OF NORMAL. THE WETTEST 24 HOUR PERIOD OF THE MONTH WAS THE
24TH WITH 0.41 INCHES. THIS WAS THE 8TH WETTEST OCTOBER SINCE 1998.
THERE WERE NO DAILY PRECIPITATION RECORDS BROKEN IN OCTOBER. THE
HIGHEST WIND GUST FOR THE MONTH WAS 40 MPH ON THE 30TH.

...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2020...

CLIMATE NORMAL PERIOD: 1981 TO 2010
CLIMATE RECORD PERIOD: 1998 TO 2020

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE
                                          NORMAL
..............................................................
TEMPERATURE (F)
RECORD
 HIGH             74   10/02/2010
 LOW             -16   10/26/2020
HIGHEST           66   10/06
                       10/07
LOWEST           -16R  10/26
AVG. MAXIMUM    46.5               48.0    -1.5
AVG. MINIMUM    19.8               23.1    -3.3
MEAN            33.2               35.6    -2.4
DAYS MAX >= 90     0
DAYS MAX <= 32     5
DAYS MIN <= 32    28
DAYS MIN <= 0      3

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        5.78   2016
 MINIMUM        0.36   1998
TOTALS          2.14               1.35    0.79     2.12
DAILY AVG.      0.07               0.04    0.03
DAYS >= .01       15
DAYS >= .10        7
DAYS >= .50        0
DAYS >= 1.00       0
GREATEST
 24 HR. TOTAL   0.63   10/10 TO 10/11
 STORM TOTAL    0.41

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

DEGREE DAYS
HEATING TOTAL    981                913      68
 SINCE 7/1      2067               2047      20
COOLING TOTAL      0                  0       0
 SINCE 1/1         0                  0       0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              3.9
RESULTANT WIND SPEED/DIRECTION   1/260
HIGHEST WIND SPEED/DIRECTION    20/270    DATE  10/17
HIGHEST GUST SPEED/DIRECTION    40/270    DATE  10/30

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.00
NUMBER OF DAYS FAIR           31
NUMBER OF DAYS PC              0
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     65

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                2     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                6     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 NOVEMBER 2020...THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 41 DEGREES...AND THE AVERAGE LOW IS 18
DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 26
DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 7 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 2.08 INCHES.

$$


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