Winter seasons have significant societal impacts across all sectors ranging from direct human health and mortality to commerce, transportation, and education. The question “How severe was this winter?” does not have a simple answer. At the very least, the severity of a winter is related to the intensity and persistence of cold weather, the amount of snow, and the amount and persistence of snow on the ground. The Accumulated Winter Season Severity Index (AWSSI) was developed to objectively quantify and describe the relative severity of the winter season.

Current Season

Previous Seasons

Download a previous season's daily data for a station. [see column descriptions]

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End of Season Summaries

1980-2020 climatology map

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Download historical subscores for a station. [see column descriptions]