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The First and Last Dates of Measurable and 1.0 inch Snowfalls
Based on data 1948-2005
Duluth, MN
Average Date of 1st measurable snowfall; 0.1 in - OCT 24th
Average Date of last measurable snowfall; 0.1 in - APR 27th
Average Date of 1st 1.0 inch snowfall - NOV 4th
Average Date of last 1.0 inch snowfall - APR 12th
International Falls, MN
Average Date of 1 st measurable snowfall, 0.1 in - OCT 20th
Average Date of last measurable snowfall; 0.1 in -APR 27th
Average Date of 1 st 1.0 inch snowfall - NOV 1st
Average Date of last 1.0 inch snowfall - APR 11th
Duluth Snowfall Records |
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What is a climate normal?
A climate normal is an average of 30 years of data. The Climate Prediction Center defines the 30 years between 1971 and 2000 as the standard 30 years of data in which the current normals are determined. Every ten years the climate normals are recalculated using the next interval of 30 years. In 2010, the new normals will be determined using the period of data from 1981 to 2010.
Example:
The normal temperature for a specific day (ex. July 4th) is calculated by taking the average temperature during the day of every July 4th for all 30 years between 1971 and 2000. The the average of those 30 days is determined to find the 30-year normal. |
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