Will Pipes Freeze in Broadwater County, MT? 83 nights a Year
Freeze nights in Broadwater County
In a normal year Broadwater County, MT gets 83 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 84% of US counties.
Risk level: Severe. The risk season runs October to April, worst in December.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 174 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 83 nights |
| Insulated pipe in unheated space | 10°F | 39 nights |
| Inside the heated house | 0°F | 17 nights |
Foam-sleeving a bare pipe in unheated space takes it from 83 nights of risk to 39 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 09/19, last around 05/19. For 20°F: 10/21 to 04/13.
How cold Broadwater County nights get
Average winter (Dec-Feb) low: 15°F; the coldest month, January, averages 14°F overnight. 9 months normally bring at least one night below 32°F (Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec). Nights below 10°F, cold enough to freeze insulated pipe in an unheated space, come in January, February, March, October, November, December: 39 nights a year, and 17 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 14°F | 17°F | 24°F | 31°F | 40°F | 47°F | 52°F | 50°F | 42°F | 32°F | 22°F | 14°F |
Broadwater County next to its neighbours
Jefferson County, MT, 49 km southwest, gets 107 nights below 20°F to Broadwater County's 83 nights. Cascade County, MT, 110 km north, gets 69 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Broadwater County, MT | - | 174 nights | 83 nights | 14°F |
| Jefferson County, MT | 49 km southwest | 214 nights | 107 nights | 10°F |
| Meagher County, MT | 53 km northeast | 204 nights | 95 nights | 13°F |
| Gallatin County, MT | 94 km south | 233 nights | 123 nights | 11°F |
| Silver Bow County, MT | 102 km southwest | 235 nights | 127 nights | 9°F |
| Cascade County, MT | 110 km north | 158 nights | 69 nights | 16°F |
| Lewis and Clark County, MT | 111 km northwest | 189 nights | 80 nights | 15°F |
Broadwater County within MT
Broadwater County ranks 44 of 56 MT counties for nights below 20°F. The most is Sheridan County, MT at 129 nights, with a 2°F average winter low. The fewest is Lake County, MT: 40 nights, winter lows near 22°F. At 3,827 ft, Broadwater County sits 95 ft below the state's median county elevation of 3,922 ft.
What to do here
- Treat it as a building fix, not a night-of routine: insulate, heat tape, seal crawlspace vents.
- An automatic leak shutoff pays for itself if one burst is avoided.
- Know where the main shutoff is before the first hard freeze.
At this many nights, foam alone is not the answer: insulate or heat tape?.
Where this comes from
NOAA 1991-2020 climate normals, blended from 3 nearby stations and adjusted for elevation; closest is Townsend (3 mi SE), MT, 5 km away (close match). A normal year, not tonight's forecast: check the forecast low for the night itself. What a "fair" or "distant" station match means is in the method guide.