Springtime Frost Frequency Near LaCrosse, Wisconsin, As Affected by Topographic Position, and Its Relation to Potential Reforestation Problems
Records obtained in a 2-year period (1960 and 1961) in hilly terrain in the unglaciated section of southwestern Wisconsin near La Crosse showed that the springtime frost frequency between April 26 and July 1 was about twice as high in a cove at 920 feet elevation as on a nearby ridgetop at 1,250 feet elevation. Freezes of 30° F. or less occured three times as often in the cove. The degree-hours of frost of 30° F. or less in the period were eight times as abundant in the cove as on the ridgetop. For freezes of 28° F. or less, the cove had 67.5 degree-hours compared to none on the ridgetop. In the cove, temperatures reached minima of 1.0 to 10.5° F. colder than on the ridge in eight of nine times on which freezes occurred in this period; these minima on six occasions were at least 3° F. colder for the cove. The temperature inversions were greatest on calm, clear nights. Long-term records over an 89-year period at La Crosse indicate there is probability of a freezing temperature on the average of about once every 2½ years in May.
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Document Type: Journal Article
Affiliations: Senior Soil Scientist, Lake States Forest Expt. Sta., St. Paul, Minn.
Publication date: 1963-05-01
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