Ice dam risk in Greenwood Village, CO
Ice dams in Greenwood Village, CO: how often
7.2 dam days a winter
Moderate risk. On an ordinary house in Greenwood Village, conditions for an ice dam come on about 7.2 days in a normal winter, mostly in February and December.
Greenwood Village averages 34 inches of snow a year and about 31 days with snow on the ground. Plenty falls, but it tends to melt off between storms, which keeps the count lower than the snowfall suggests. That gap is why snowfall alone misleads.
What your attic does to that number in Greenwood Village
| Attic | Dam days | Risk |
|---|---|---|
| Air-sealed and well insulated | 5.7 | Moderate |
| Typical, some insulation, not air-sealed | 7.2 | Moderate |
| Older or poorly insulated, warm attic | 9.0 | Moderate |
The attic matters less in Greenwood Village than in colder towns: there are only 1.5 days a winter between a typical attic and a sealed one.
Preventing ice dams on a Greenwood Village roof
- Rake the bottom three or four feet of roof after any storm that leaves more than about six inches, from the ground with a roof rake.
More on when a roof rake is worth it.
Greenwood Village winter, month by month
| Month | Snow (in) | Days on ground | Dam days |
|---|---|---|---|
| January | 6.3 | 6.1 | 1.6 |
| February | 6.2 | 7.7 | 2.1 |
| March | 5.4 | 4.3 | 0.8 |
| April | 4.1 | 1.4 | 0.1 |
| May | 0.8 | 0.3 | 0.0 |
| October | 1.7 | 1.1 | 0.1 |
| November | 3.7 | 2.9 | 0.5 |
| December | 5.9 | 7.0 | 1.9 |
Greenwood Village next to nearby towns
Greenwood Village ranks 46 of 53 Colorado cities here for ice-dam days, behind Steamboat Springs at 51.0 days.
- Centennial, CO 3 mi, 7.2 days
- Englewood, CO 5 mi, 7.2 days
- Littleton, CO 6 mi, 7.2 days
- Lone Tree, CO 6 mi, 11.5 days
- Denver, CO 10 mi, 10.4 days
Where these numbers come from
NOAA 1991–2020 climate normals from Marston Fltr Plt, 8.2 miles from Greenwood Village. 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.