Ice dam risk in Independence, MO

Ice dams in Independence, MO: how often

5.2 dam days a winter

Moderate risk. On an ordinary house in Independence, conditions for an ice dam come on about 5.2 days in a normal winter, mostly in January and December.

Independence averages 13 inches of snow a year and about 20 days with snow on the ground. Most of it comes and goes within a few days. The conditions that make a dam need all three at once: snow, cold at the eave and heat above it.

What your attic does to that number in Independence

Attic	Dam days	Risk
Air-sealed and well insulated	3.2	Low
Typical, some insulation, not air-sealed	5.2	Moderate
Older or poorly insulated, warm attic	7.6	Moderate

The attic matters less in Independence than in colder towns: there are only 2.0 days a winter between a typical attic and a sealed one.

Preventing ice dams on a Independence roof

Check the gutters before the first snow and clear them, so meltwater has somewhere to go. If you see icicles thicker than a finger along the eave after a storm, that is the early sign to look at the attic.

Snowy places are not always the worst: why snowfall misleads.

Independence winter, month by month

Month	Snow (in)	Days on ground	Dam days
January	3.6	7.6	2.4
February	2.6	4.0	1.0
March	1.7	2.0	0.3
April	0.2	0.2	0.0
October	0.4	0.2	0.0
November	1.2	0.8	0.1
December	3.5	5.2	1.4

Independence next to nearby towns

Independence ranks 7 of 80 Missouri cities here for ice-dam days, behind Maryville at 9.3 days.

Blue Springs, MO 7 mi, 5.2 days
Raytown, MO 9 mi, 5.2 days
Grain Valley, MO 9 mi, 5.2 days
Kansas City, MO 11 mi, 4.5 days
Liberty, MO 11 mi, 5.2 days

Where these numbers come from

NOAA 1991–2020 climate normals from Independence, 2.3 miles from Independence. A dam day is a day with snow on the roof and freezing at the eave while heat or sun melts the snow above it. This describes a normal winter, not this one.