Weather
Minnesota Snow: Why 20 Inches Can Start With Just 1 Inch
Minneapolis, MN – Winter storms across Minnesota can produce dramatically different snowfall totals, even when communities receive similar amounts of moisture. From Minneapolis to Duluth, just 1 inch
By Lena Wood · 2026-11-10T07:50:33.389Z
Minneapolis, MN – Winter storms across Minnesota can produce dramatically different snowfall totals, even when communities receive similar amounts of moisture. From Minneapolis to Duluth, just 1 inch of liquid precipitation can sometimes produce 5 inches of heavy, wet snow or as much as 20 inches of lighter, fluffier snow.
The difference comes down to the snow to liquid ratio, which measures how much snow accumulates from a given amount of liquid water.
Why One Inch Can Produce 20 Inches of Snow
A commonly used forecasting guideline is the 10 to 1 ratio, meaning 1 inch of liquid water produces approximately 10 inches of snow.
However, actual snowfall ratios can vary considerably.
Heavy, wet snow may have a ratio near 5 to 1, producing approximately 5 inches from 1 inch of liquid precipitation.
Under colder atmospheric conditions favorable for fluffy snow, ratios can sometimes reach 20 to 1, producing approximately 20 inches from the same moisture.
Minnesota's cold winters can support higher snowfall ratios, although extremely cold conditions do not automatically produce the fluffiest snow.
Minneapolis and Duluth: Why Snowfall Can Differ
Minneapolis, located in the Twin Cities metropolitan area, receives snowfall primarily from larger weather systems moving across the Upper Midwest.
Duluth, situated along Lake Superior, experiences additional winter weather influences from the lake and surrounding terrain.
When cold air moves across relatively warmer, unfrozen lake water, it can collect heat and moisture, helping produce lake effect snow.
Duluth's elevated terrain can also enhance snowfall under favorable wind and atmospheric conditions.
As a result, snowfall totals near Lake Superior can differ considerably from those in central and southern Minnesota.
What Minnesota Residents Should Know
Heavy, wet snow can place additional weight on trees and power lines, increasing the potential for damage and outages.
Lighter, fluffier snow can accumulate more deeply and create blowing snow when strong winds develop.
Travel conditions can deteriorate rapidly along Interstate 35, Interstate 94 and Highway 61, particularly during heavy snow and reduced visibility.
Understanding snow to liquid ratios helps explain why snowfall forecasts can change even when expected moisture amounts remain similar.
For Minnesota residents, snowfall depth depends on more than precipitation alone. Temperature, wind, snowflake structure and Lake Superior's influence can dramatically affect final totals.