Preliminary
Wyoming Monthly Climatology
August 2005

Statewide Summary

Graphs show that during the month of August, temperatures ranged from 2°F above normal over Sublette County to 4°F below normal over the Eastern Bighorn Basin. Precipitation consisted of a highly complex pattern ranging from 25% to 300% of normal. This was the result of widely scattered thunderstorms across the state. Modeled soil moisture showed no significant worsening of conditions across the Wyoming Rockies since last month. Stream flows were near normal except over portions of east central, north central, northwestern Wyoming. The Drought Monitor map shows conditions varying from no drought to severe drought over Wyoming with slight improvement & worsening since the end of May 2005.

For the summer of 2005, precipitation was above normal over the eastern third, north central, and northwestern corner of Wyoming while below normal precipitation dominated the central and western regions of the state.

As of 28 August, 40 percent of the State had adequate topsoil moisture, 3 points below last week. Topsoil moisture supplies were well ahead of the 5-year average of 13 percent. Irrigation water supplies were adequate in 71 percent of the state, much better than last year's 41 percent and the 5-year average of 29 percent. Range and pasture lands were rated good or excellent in 49 percent of the state, well ahead of last year's 13 percent and the average of 9 percent. Conditions remained the best since 1999.

Weather Summary: For the week ending Friday, August 5th, temperatures ranged from 0.6 degrees below normal in Worland to 4.1 degrees above normal in Chugwater. The high temperature was 98 in Sundance and the low was 37 in Jackson. Temperatures cooled down across most of Wyoming, but they remained mostly above normal. Wheatland reported the most precipitation with 1.10 inches, Afton with 0.91 inches, Big Piney reported 0.84 inches, and 0.66 inches in both Chugwater and Torrington.

Weather Summary: For the week ending Friday, August 12th, temperatures were mostly above normal and ranged from 1.4 degrees below normal in Worland to 3.9 degrees above normal in Evanston. The high temperature was 100 in Redbird and the low was 31 in Jackson. Cool, wet conditions moved across Wyoming late in the week. All stations received some rain. Redbird reported the most precipitation with 1.42 inches, Newcastle with 1.11 inches, Kaycee with 1.05 inches, and 0.95 inch in Casper.

Weather Summary: For the week ending Friday, August 19th, temperatures were mostly below normal ranging from 7.1 degrees below normal in Casper to 0.7 degrees above normal in Evanston. The high temperature was 93 in Deaver and the low was 31 in Jackson. Precipitation was above normal except in the Southeast and South Central. Newcastle reported the most precipitation with 2.65 inches, followed by Afton with 1.22 inches and Jackson with 1.08 inches.

A WEATHER SYSTEM BROUGHT SHOWERS AND THUNDERSTORMS TO MUCH OF WYOMING WEDNESDAY NIGHT THROUGH LATE THURSDAY NIGHT. WHAT FOLLOWS ARE SOME RAINFALL AMOUNTS FROM RAWS (REMOTE AUTOMATED WEATHER STATIONS) SITES ACROSS OUR COUNTY WARNING AREA. THESE TOTALS ARE 36 HOUR RAINFALL AMOUNTS FROM 600 PM ON AUG 17TH...UNTIL 600 AM ON AUG 19TH.

...YELLOWSTONE NATIONAL PARK...

BECHLER... 1.26 INCHES.
THOROFARE... 1.19 INCHES.
QUADRANT... 0.78 INCHES.

...TETON COUNTY...

COYOTE MEADOWS... 0.94 INCHES.
BURRO HILL... 0.81 INCHES.
GRAND TETON... 0.75 INCHES.

...SUBLETTE COUNTY...

HALF MOON... 0.95 INCHES.
HOBACK... 0.74 INCHES.
SNIDER BASIN... 0.37 INCHES.

...FREMONT COUNTY...

RASPBERRY... 1.24 INCHES.
WIND RIVER... 0.26 INCHES.

...HOT SPRINGS COUNTY...

GRASS CREEK... 0.25 INCHES.

...BIG HORN COUNTY...

MILL CREEK... 0.30 INCHES.

...PARK COUNTY...

EAGLE... 0.93 INCHES.
CRANDALL... 0.66 INCHES.
RATTLESNAKE MTN... 0.60 INCHES.

Weather Summary: For the week ending Friday, August 26th, temperatures ranged from 3.1 degrees below normal in Worland to 3.9 degrees above normal in Big Piney. The high temperature was 95 in Greybull and Wheatland and the low was 29 in Jackson. Precipitation was below normal for nearly all of the state. Redbird reported the most precipitation with 0.39 inches, followed by Archer with 0.34 inches and Sundance with 0.20 inches.

August, preliminary severe weather reports:

Preliminary Severe Weather Reports: reference

Date Time Event City County State Remarks (reporting NWSFO)

2 0050 75H 8 S GLENROCK CONVERSE WY ONE AND ONE HALF INCHES OF HAIL ON GROUND. EST 50 MPH WINDS (CYS)

9 2218 175H 10 N BUFFALO JOHNSON WY FORT PHIL KEARNY STATE HISTORICAL SITE EMPLOYEE REPORTED GOLF BALL SIZE HAIL (RIW)

10 0121 64W BUFFALO JOHNSON WY (RIW)

12 2251 TOR WRIGHT CAMPBELL WY *** 2 FATAL, 13 INJ *** 40-50 MOBILE HOMES DESTROYED. DAMAGE PATH UP TO ONE QUARTER MILE WIDE. ALL INFORMATION IS PRELIMINARY. (UNR)

13 0105 TOR 13 N DOUGLAS CONVERSE WY (CYS)

12 2151 100H 6 SE THERMOPOLIS HOT SPRINGS WY (RIW)

12 2210 100H 15 SE GILLETTE CAMPBELL WY (UNR)

12 2216 175H SAVAGETON CAMPBELL WY (UNR)

12 2245 175H 13 SE ROZET WESTON WY GOLFBALL SIZE HAIL BROKE OUT WINDOWS IN A HOME. (UNR)

12 2303 88H 13 E WRIGHT CAMPBELL WY (UNR)

13 0020 175H 1 N BILL CONVERSE WY HAIL LASTED FOR 5 MINUTES...UNTIL 625 PM. THE LARGE HAIL WAS BETWEEN 1 AND 3 MILES NORTH OF BILL AND COVERED THE GROUND TO A DEPTH OF 6 INCHES. (CYS)

13 0030 75H 4 N NEWCASTLE WESTON WY (UNR)

13 0110 175H 2 S BILL CONVERSE WY (CYS)

13 0020 60W 3 W NEWCASTLE WESTON WY (UNR)

key: All Times UTC (MDT is 8 hours earlier), Wind (W) Gusts in MPH, Hail (H) Sizes in 1/100 of an Inch (75 = 0.75") and Tornado (TOR).

Cheyenne
Calendar

The average temperature in August was 66.4°F. This is 0.5°F warmer than normal for the month. The maximum temperature for the month was 93°F on the 30th and the minimum of 43°F occurred on the 31st. Record cool maximum temperature of 53°F occurred on the 13th. Precipitation total of 1.61 inches is 88% of normal. The wettest day in the was on the 2nd (0.39 inch fell).

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    Laramie
    Calendar

    The average temperature in August was 61.4°F. This is 0.3°F cooler than normal for the month. The maximum temperature for the month was 86°F on the 8th and the minimum of 34°F occurred on the 31st. Record cool maximum temperature of 62°F occurred on the 13th. Precipitation total of 0.70 inch is 57% of normal. The wettest day in the was on the 13th (0.25 inch fell).

    Rawlins
    Calendar

    The average temperature in August was 64.5°F. This is 2.0°F cooler than normal for the month. The maximum temperature for the month was 91°F on the 8th and the minimum for the month was 31°F occurring on the 31st. Record cool maximum temperature of 68°F occurred on the 13th. Precipitation total of 0.10 inch is 12% of normal. The wettest day in the was on the 2nd (0.03 inch fell).

    Rock Springs
    Calendar

    The average temperature in August was 65.6°F. This is 0.3°F warmer than normal for the month. The maximum temperature for the month was 90°F on the 8th and the minimum for the month was 42°F occurring on the 13th and 14th. Precipitation total of 1.09 inches is 194% of normal. The wettest day in the was on the 16th-17th (0.64 inch fell).

    Evanston
    Calendar

    The average temperature in August was 64.2°F. This is 2.8°F warmer than normal for the month. The maximum temperature for the month was 85°F on the 7th and the minimum for the month was 35°F occurring on the 31st. Precipitation total of 0.90 inch is 96% of normal. The wettest day in the was on the 2nd (0.49 inch fell).

    Big Piney.
    Calendar

    The average temperature in August was 59.7°F. This is 1.5°F warmer than normal for the month. The maximum temperature for the month was 87°F on the 29th and the minimum for the month was 32°F occurring on the 26th and 30th. Precipitation total of 1.20 inches is 150% of normal. The wettest day in the was on the 1st-2nd (0.59 inch fell).

    Lander
    Calendar

    The average temperature in August was 68.0°F. This is 1.4°F cooler than normal. The maximum temperature for the month was 93°F on the 7th and 29th (record for the day) and the minimum for the month of 37°F occurred on the 31st. Precipitation total of 0.54 inch is 95% of normal. The wettest day in the was on the 10th (0.17 inch fell).

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    Riverton
    Calendar

    The average temperature in August was 68.1°F. This is 0.1°F cooler than normal. The maximum temperature for the month was 94°F on the 7th and 8th and the minimum for the month of 40°F occurred on the 31st. Precipitation total of 0.31 inch is 63% of normal. The wettest day in the was on the 10th (0.10 inch fell).

    Worland
    Calendar
    The average temperature in August was 68.0°F. This is 3.9°F cooler than normal for the month. The maximum temperature for the month was 98°F on the 7th and the minimum for the month of 47°F occurred on the 27th. Precipitation total of 0.16 inch is 23% of normal. The wettest day in the was on the 31st (0.08 inch fell).

    Sheridan
    Click Preliminary Climatology Data F6 for Sheridan.
    Calendar

    The average temperature in August was 65.8°F. This is 2.4°F cooler than normal for the month. The maximum temperature for the month was 98°F on the 29th and the minimum for the month of 35°F occurred on the 31st. Precipitation total of 1.20 inches is 150% of normal. The wettest day in the was on the 18th (0.29 inch fell).

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    Casper
    Calendar

    The average temperature in August was 66.3°F. This is 2.3°F cooler than normal. The maximum temperature for the month was 95°F on the 8th and the minimum for the month of 37°F occurred on the 30th and 31st. A record low temperature of 39°F occured on the 26th. Precipitation total of 2.24 inches is 307% of normal and represents the 3rd wettest August on record (wettest is 2.79 inches in 1941). A flash flood event occurred on the 26th.

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    Douglas
    Calendar

    The average temperature in August was 67.8°F. This is 1.0°F cooler than normal for the month. The maximum temperature for the month was 98°F on the 30th and the minimum for the month of 34°F occurred on the 31st. Precipitation total of 0.96 inch is 105% of normal. The wettest day in the was on the 10th (0.53 inch fell).

    Torrington
    Calendar

    The average temperature in August was 69.0°F. This is 1.2°F cooler than normal for the month. The maximum temperature for the month was 98°F on the 30th and the minimum for the month of 41°F occurred on the 31st. Precipitation total of 1.11 inches is 93% of normal. The wettest day in the was on the 12th-13th (0.64 inch fell).

    Additional Summaries:

    Buffalo (Calendar)
    Cody
    Gillette or
    Click Automated Monthly Data F6 for more Gillette data (Calendar)
    Greybull (Calendar)
    Jackson (Calendar)
    Yellowstone Lake (Calendar)

    This information was compiled by the Wyoming State Climatologist, University of Wyoming. For more information, contact Jan Curtis at (307) 766-6659. For periodic updates, visit http://www.wrds.uwyo.edu. This site includes a searchable database for Wyoming climate and water. For additional daily and hourly climatology, click on historical at the bottom of the daily summary statistics. For Casper, Lander, and Riverton's Monthly F6 reports, see here and at the bottom of this webpage. Record daily temperatures are based on the period since 1948-9 for all cities unless otherwise noted.

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    Wyoming State Climatologist The Wyoming State Climatologist Office is funded by the Wyoming Water Development Commission

    WEBMASTER: stateclim@wrds.uwyo.edu
    Last reviewed or update: September 2, 2005

    		 Water Resources Data System