Will Pipes Freeze in Nantucket County, MA? 18 nights a Year
Freeze nights in Nantucket County
In a normal year Nantucket County, MA gets 18 nights at or below 20°F, the point where bare pipes in a garage, attic or outside wall start to freeze. That is more than 35% of US counties.
Risk level: Regular. The risk season runs December to March, worst in January.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 86 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 18 nights |
| Insulated pipe in unheated space | 10°F | 3 nights |
| Inside the heated house | 0°F | under 1 night |
Foam-sleeving a bare pipe in unheated space takes it from 18 nights of risk to 3 nights. A 12 ft heat-tape kit runs $17 to $37; an average burst-pipe repair is about $500.
Month by month
Nights at or below 20°F in a normal year.
First 32°F night is usually around 11/08, last around 04/13. For 20°F: 12/19 to 03/06.
How cold Nantucket County nights get
Average winter (Dec-Feb) low: 29°F; the coldest month, January, averages 27°F overnight. 6 months normally bring at least one night below 32°F (Jan, Feb, Mar, Apr, Nov, Dec). Nights below 10°F, cold enough to freeze insulated pipe in an unheated space, come in January: 3 nights a year, and under 1 night below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 27°F | 27°F | 32°F | 39°F | 47°F | 56°F | 63°F | 63°F | 57°F | 49°F | 40°F | 32°F |
Nantucket County next to its neighbours
Barnstable County, MA, 46 km north, gets 25 nights below 20°F to Nantucket County's 18 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Nantucket County, MA | - | 86 nights | 18 nights | 27°F |
| Barnstable County, MA | 46 km north | 99 nights | 25 nights | 24°F |
| Dukes County, MA | 51 km west | 105 nights | 32 nights | 24°F |
| Plymouth County, MA | 94 km northwest | 122 nights | 44 nights | 21°F |
| Bristol County, MA | 96 km northwest | 124 nights | 41 nights | 20°F |
| Newport County, RI | 101 km west | 96 nights | 27 nights | 24°F |
| Bristol County, RI | 109 km northwest | 106 nights | 32 nights | 23°F |
Nantucket County within MA
Nantucket County ranks 14 of 14 MA counties for nights below 20°F. The most is Berkshire County, MA at 75 nights, with a 16°F average winter low. At 3 ft, Nantucket County sits 149 ft below the state's median county elevation of 153 ft.
What to do here
- Insulate every pipe in unheated space before the season starts.
- Heat tape on the runs you cannot insulate well.
- Shut off and drain outdoor spigots for the season.
When to have the house ready: when freeze season starts.
Where this comes from
NOAA 1991-2020 climate normals, blended from 3 nearby stations and adjusted for elevation; closest is Nantucket Memorial Airport, MA, 6 km away (close match). A normal year, not tonight's forecast: check the forecast low for the night itself. How a county figure is built from stations: how the numbers are made.