Preliminary
Wyoming Monthly Climatology
April 2003
Statewide Summary
Temperatures for the month of April were above normal across much of Wyoming. Average temperatures ranged from >6 degrees above normal in parts of Crook, Big Horn, and Fremont counties to near normal in parts of Lincoln, Sublette, Carbon, and Hot Springs counties. Precipitation for the month of April also showed large variation across the state. The heaviest moisture amounts fell in portions of southeastern, northwestern, and north central Wyoming (>130 percent), the least over southwestern Wyoming counties (<25 percent). The drought that has persisted in Wyoming since the spring of 2000 continues. During the past year, much of Wyoming has experienced well below normal precipitation especially over the southwestern part of the state. Soil moisture negative departure from long term means are noted over southwest Wyoming with positive departures over portions of northeastern Wyoming. At Torrington in eastern Wyoming, soil moisture, especially at depth, has recovered somewhat in April.
Cheyenne
The average temperature in April was 45.8°F. This is 4.2°F warmer than normal. The maximum for the month was 75 °F on the 13th (record for the day) and the minimum of 21°F occurred on the 5th. Precipitation total of 2.15 inches is 139 percent of normal. Snowfall totaled 6.2 inches which is 61 percent of the long term average.
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Laramie
The average temperature in April was 40.0°F. This is 2.8°F warmer than normal. The maximum for the month was 70°F on the 13th (record for the day) and the minimum for the month was 16°F that occurred on the 8th. Precipitation total of 1.28 inches is 121 percent of normal. Snowfall totaled 13.6 inches which is 189 percent of the long term average. A few cooperative observers in and around Laramie recorded between 2.5 and 3.0 inches of water-equivalent precipitation in April.
Rawlins
The average temperature in April was 43.0°F. This is 1.4°F warmer than normal. The maximum temperature for the month was 69°F on the 12th and 13th and the minimum temperature for the month of 17°F occurred on the 5th. Precipitation total of 1.47 inches is 139 percent of normal. Snowfall totaled 12.0 inches which is 169 percent of the long term average.
Rock Springs
The average temperature in April was 43.4°F. This is 3.7°F warmer than normal. The maximum temperature for the month was 68°F on the 10th and 11th and the minimum of 15°F occurred on the 4th. Precipitation total of 0.30 inch is 29 percent of normal. Snowfall totaled 3.1 inches which is 50 percent of the long term average.
Evanston
The average temperature in April was 40.1°F. This is 1.2°F warmer than normal. The maximum temperature for the month was 67°F on the 10th and the minimum of 12°F occurred on the 4th. Precipitation total of 0.82 inch is 73 percent of normal. Snowfall totaled 7.3 inches which is 140 percent of the long term average.
Big Piney
The average temperature in April was 38.2°F. This is 1.8°F warmer than normal. The maximum temperature for the month was 66°F on the 11th, 12th, and 13th and the minimum of 11°F occurred on the 4th. Precipitation total of 0.10 inch is 19 percent of normal. Snowfall totaled 0.8 inch which is 23 percent of the long term average.
Lander
The average temperature in April was 47.7°F. This is 3.8°F warmer than normal. The maximum temperature for the month was 74°F on the 11th and the minimum for the month of 19°F occurred on the 4th. Precipitation total of 0.88 inch is 43 percent of normal. Snowfall totaled 0.2 inch which is 1 percent of the long term average.
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Riverton
The average temperature in April was 47.7°F. This is 3.5°F warmer than normal. The maximum temperature for the month was 74°F on the 13th and the minimum for the month of 20°F occurred on the 7th. Precipitation total of 1.10 inches is 109 percent of normal. Snowfall totaled 1.4 inches which is 25 percent of the long term average.
Worland
The average temperature in April was 49.6°F. This is 2.1°F warmer than normal. The maximum temperature for the month was 79°F on the 12th and the minimum of 20°F occurred on the 5th. Precipitation total of 1.49 inches is 182 percent of normal. No snowfall occurred although the long term average is 3.1 inches. An unusual precipitation event on the 30th and is worth reading.
Sheridan
The average temperature in April was 47.2°F. This is 3.3°F warmer than normal. The maximum temperature for the month was 79°F on the 12th and the minimum for the month of 18°F occurred on the 5th. Precipitation total of 2.29 inches is 129 percent of normal. Snowfall totaled 1.3 inches which is 12 percent of the long term average.
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Casper
The average temperature in April was 45.6°F. This is 2.9°F warmer than normal. The maximum temperature for the month was 75°F on the 13th and the minimum for the month of 14°F occurred on the 5th. Precipitation total of 1.54 inches is 101 percent of normal. Snowfall totaled 6.6 inches which is 52 percent of the long term average.
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Torrington
The average temperature in April was 49.3°F. This is 3.3°F warmer than normal. The maximum temperature for the month was 83°F on the 13th (tied for record for the day) and the minimum for the month of 20°F occurred on the 8th. Precipitation total of 2.23 inches is 133 percent of normal. Snowfall totaled 8.1 inches which is 245 percent of the long term average and represents the 8th snowiest April on record since 1922.
Additional Stations:
Buffalo
Douglas
Gillette
Greybull
Yellowstone
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 this interactive map by selecting a city. Then click on the "Monthly History" link on the left menu. Record daily temperatures are based on the period since 1948-9 for all cities unless otherwise noted.
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