Preliminary
Wyoming Monthly Climatology
June 2003
Statewide Summary
Temperatures for the month of June were above normal over western Wyoming and below normal over eastern Wyoming. Average temperatures ranged from 4 degrees below normal at Rawlins to 1 degree above normal in Evanston. Precipitation for the month of June also showed large variation across the state. The heaviest moisture amounts fell in portions of southeastern, central and southwest Wyoming (>150 percent), the least over northwestern Wyoming (<50 percent). Generally, good timing of precipitation and cool temperatures helped to improve drought levels by at least one category during the month with a temporary end to the drought over southern Albany and Laramie counties. However, the hydrological drought is still firmly entrenced over portions of southwest Wyoming during the current water year (starting in Oct 2002). Soil moisture negative departure from long term means are noted over northwest and south central Wyoming with the remainder of the state near normal. At Torrington in eastern Wyoming, soil moisture, especially at depth, has shown afairly steady decline during the month. However, Topsoil moisture supplies improved again with 63 percent of the State having adequate or surplus topsoil moisture as of June 29. This is 6 points higher than last week, an overwhelming 56 points higher than last year at this time, and 22 points above the 5-year average for this date. Could the statewide drought be finally ending? Probably not since the heat of the summer is just beginning.
Cheyenne
The average temperature in June was 58.3°F. This is 3.2°F cooler than normal. The maximum temperature for the month was 87°F on the 30th and the minimum of 33°F occurred on the 7th. An unusual record was broken on the 24th: The high temperature at the Cheyenne airport reached 49°F. This shattered the previous record cold maximum temperature of 56°F set in 1906. Precipitation total of 2.69 inches is 127 percent of normal. A trace of snow was recorded on the 23rd.
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Laramie
The average temperature in June was 54.9°F. This is 2.2°F cooler than normal. The maximum temperature for the month was 84°F on the 30th and the minimum for the month was 31°F that occurred on the 6th and 8th. Precipitation total of 0.82 inch is 62 percent of normal.
Rawlins
The average temperature in June was 57.4°F. This is 3.9°F cooler than normal. The maximum temperature for the month was 89°F on the 30th and the minimum temperature for the month of 32°F that occurred on the 8th. Precipitation total of 1.44 inches is 155 percent of normal.
Rock Springs
The average temperature in June was 59.0°F. This is 0.6°F cooler than normal. The maximum temperature for the month was 88°F on the 30th and the minimum of 32°F occurred on the 7th. Precipitation total of 2.20 inches is 324 percent of normal and represents the 5th wettest June since 1949.
Evanston
The average temperature in June was 56.9°F. This is 1.0°F warmer than normal. The maximum temperature for the month was 83°F on the 30th and the minimum of 32°F occurred on the 23th. Precipitation total of 2.42 inches (1.18 inches fell on the 18th) is 252 percent of normal which represents the 9th wettest June since 1898. Snowfall totaled 2.9 inches (all occurring on the 23rd) which is the 4th snowiest June since 1898.
Big Piney
The average temperature in June was 54.3°F. This is 0.7°F cooler than normal. The maximum temperature for the month was 86°F on the 30th and the minimum of 30°F occurred on the 5th. Precipitation total of 1.13 inches is 157 percent of normal.
Lander
The average temperature in June was 60.6°F. This is 3.1°F cooler than normal. The maximum temperature for the month was 92°F on the 30th and the minimum for the month of 38°F occurred on the 7th and 8th. Precipitation total of 1.70 inches is 148 percent of normal. The yearly total of 6.23 inches is still only 79 perrcent of normal.
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Riverton
The average temperature in June was 60.8°F. This is 2.9°F cooler than normal. The maximum temperature for the month was 91°F on the 30th and the minimum for the month of 36°F occurred on the 7th. Precipitation total of 2.51 inches is 220 percent of normal. This years total of 5.85 inches is 118 perecent of normal.
Worland
The average temperature in June was 63.1°F. This is 3.1°F cooler than normal. The maximum temperature for the month was 96°F on the 30th and the minimum of 36°F occurred on the 7th. Precipitation total of 1.16 inches is 102 percent of normal.
Sheridan
The average temperature in June was 59.4°F. This is 2.2°F cooler than normal. The maximum temperature for the month was 92°F on the 30th and the minimum for the month of 34°F occurred on the 8th. Precipitation total of 2.58 inches is 128 percent of normal.
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Casper
The average temperature in June was 59.3°F. This is 3.4°F cooler than normal. The maximum temperature for the month was 90°F on the 30th and the minimum for the month of 34°F occurred on the 8th. Precipitation total of 4.71 inch (2.12 inches fell on the 16th) is 329 percent of normal and represents the 6th wettest June on record. The precipitation on the 16th also marks the third wettest June day on record, only missing the all time record of 2.15 inches on June 19, 1986 by 0.03 inch.
MONTH, YEAR PRECIP AMOUNT
MAY, 1978 6.46
MAY, 1995 6.31
APRIL, 1941 5.75
MAY, 1971 5.59
MAY, 1991 4.75
JUNE, 2003 4.71
OCTOBER, 1998 4.62
OCTOBER, 1994 4.17
JUNE, 1982 4.15
JUNE, 1986 4.06
past 30-days precipitation
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Torrington
The average temperature in June was 63.5°F. This is 2.8°F cooler than normal. The maximum temperature for the month was 91°F on the 30th and the minimum for the month of 33°F occurred on the 8th. Precipitation total of 2.04 inches is 98 percent of normal.
Additional Stations:
Buffalo
Douglas
Gillette
Greybull
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. Record daily temperatures are based on the period since 1948-9 for all cities unless otherwise noted.
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