Climatological Report (Monthly)
Issued by NWS
Issued by NWS
977
CXUS55 KRIW 031845
CLMP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1229 PM MDT MON AUG 03 2026
...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE
MONTH OF JULY 2026...
...OFFICIAL CLIMATE DATA FOR THE MONTH OF JULY 2026 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 JULY...
SEVERAL DAYS OF DATA IN MID-JULY ARE MISSING SO THE AVERAGES MAY NOT
BE REPRESENTATIVE. THE AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN
JULY WAS 59.6 DEGREES WHICH IS 4.1 DEGREES ABOVE NORMAL. IT WAS THE
4TH WARMEST JULY ON RECORD. THE WARMEST READING OF THE MONTH WAS 88
DEGREES ON THE 12TH AND BROKE THE 2002 RECORD OF 85. IT ALSO SET A
NEW ALL-TIME RECORD HIGH FOR JULY AND FOR THE YEAR. PREVIOUS RECORD
WAS 86 SET IN 2021, 2002 AND 2000. THE 24TH HIT 83 AND BROKE 82
FROM 2017. THE 26TH HIGH OF 83 BROKE 82 DEGREES FROM 2021. THE
COLDEST READING OF THE MONTH WAS 31 DEGREES ON THE 1ST. THE 3RD LOW
OF 34 TIED THE 2018 RECORD.
TOTAL PRECIPITATION AT LAKE YELLOWSTONE WAS 0.85 INCHES...WHICH WAS
56 PERCENT OF NORMAL. THE WETTEST 24-HOUR PERIOD DURING THE MONTH
WAS THE 21ST-22ND WITH 0.34 INCHES. THIS BROKE THE 2008 RECORD OF
0.14. THE 24TH HAD 0.06 INCHES AND TIED 2018. THE HIGHEST WIND GUST
WAS 35 MPH FROM THE WEST ON THE 3RD...FROM THE SOUTHEAST ON THE 12TH
AND FROM THE NORTHWEST ON THE 24TH.
...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF JULY
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 88 07/12/2026
LOW 27 07/12/2008
HIGHEST 88R 07/12
LOWEST 31 07/01
AVG. MAXIMUM 76.9 72.2 4.7
AVG. MINIMUM 42.4 38.7 3.7
MEAN 59.6 55.5 4.1
DAYS MAX >= 90 0
DAYS MAX <= 32 0
DAYS MIN <= 32 1
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 2.42 2007
MINIMUM 0.17 2022
TOTALS 0.85 1.51 -0.66 0.74
DAILY AVG. 0.03 0.05 -0.02
DAYS >= .01 7
DAYS >= .10 2
DAYS >= .50 0
DAYS >= 1.00 0
GREATEST
24 HR. TOTAL 0.34 07/21 TO 07/21
STORM TOTAL 0.34
DEGREE DAYS
HEATING TOTAL 116 296 -180
SINCE 7/1 116 294 -178
COOLING TOTAL 2 0 2
SINCE 1/1 2 0 2
..............................................................
WIND (MPH)
AVERAGE WIND SPEED 1.9
RESULTANT WIND SPEED/DIRECTION 0/090
HIGHEST WIND SPEED/DIRECTION 20/280 DATE 07/03
HIGHEST GUST SPEED/DIRECTION 35/270 DATE 07/03
35/290 07/24
35/110 07/12
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.00
NUMBER OF DAYS FAIR 23
NUMBER OF DAYS PC 0
NUMBER OF DAYS CLOUDY 0
AVERAGE RH (PERCENT) 59
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 1 MIXED PRECIP 0
HEAVY RAIN 0 RAIN 0
LIGHT RAIN 7 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 AUGUST 2026. THE AVERAGE HIGH TEMPERATURE ON THE
FIRST OF THE MONTH IS 74 DEGREES...AND THE AVERAGE LOW TEMPERATURE
IS 40 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 67
DEGREES AND THE AVERAGE LOW TEMPERATURE IS 34 DEGREES. THE AVERAGE
MONTHLY PRECIPITATION IS 1.34 INCHES.
$$