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How Many Harvest Days Are Available?
A potential harvest period of 45 days, ranging from July 20 to September 2 in Southeastern North Dakota to July 30 to September 12 in the Northeast was used to determine number of harvest days available. Research indicates about .21 inch of rain will completely wet a typical small grain windrow, so rainfall of .20 inch or more was assumed to cause a 2 day harvest delay. Rainfall of 0.5 inch or less was assumed to cause little harvest time lost, but this depends on associate weather conditions. Rainfall of an inch or more is assumed to cause four harvest days lost.
Based on long-term weather records, 90 percent of the time there will be at least 14 harvest days available in Northeastern North Dakota, increasing to 24 days in the Southwest and 29 days in the Northwest. This trend reflects decreasing rainfall amounts from East to West across the state.
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