Will Pipes Freeze in Carroll County, MD? 35 nights a Year
Freeze nights in Carroll County
In a normal year Carroll County, MD gets 35 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 51% of US counties.
Risk level: Regular. The risk season runs November to March, worst in January.
It depends where the pipe is
| Pipe | Freezes near | Nights a year |
|---|---|---|
| Outdoor spigot, open crawlspace | 32°F | 112 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 35 nights |
| Insulated pipe in unheated space | 10°F | 9 nights |
| Inside the heated house | 0°F | 2 nights |
Foam-sleeving a bare pipe in unheated space takes it from 35 nights of risk to 9 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 10/20, last around 04/24. For 20°F: 11/26 to 03/16.
How cold Carroll County nights get
Average winter (Dec-Feb) low: 24°F; the coldest month, January, averages 22°F overnight. 7 months normally bring at least one night below 32°F (Jan, Feb, Mar, Apr, Oct, Nov, Dec). Nights below 10°F, cold enough to freeze insulated pipe in an unheated space, come in January, February, March, December: 9 nights a year, and 2 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 22°F | 24°F | 31°F | 41°F | 51°F | 60°F | 64°F | 62°F | 55°F | 44°F | 34°F | 27°F |
Carroll County next to its neighbours
Adams County, PA, 38 km northwest, gets 41 nights below 20°F to Carroll County's 35 nights. Frederick County, MD, 34 km west, gets 23 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Carroll County, MD | - | 112 nights | 35 nights | 22°F |
| Frederick County, MD | 34 km west | 90 nights | 23 nights | 26°F |
| Howard County, MD | 35 km south | 87 nights | 20 nights | 26°F |
| Baltimore County, MD | 37 km east | 85 nights | 20 nights | 27°F |
| Adams County, PA | 38 km northwest | 122 nights | 41 nights | 21°F |
| Baltimore city, MD | 45 km southeast | 54 nights | 10 nights | 30°F |
| York County, PA | 47 km northeast | 120 nights | 38 nights | 21°F |
Carroll County within MD
Carroll County ranks 2 of 24 MD counties for nights below 20°F. The most is Garrett County, MD at 57 nights, with a 20°F average winter low. The fewest is Baltimore city, MD: 10 nights, winter lows near 32°F. At 729 ft, Carroll County sits 592 ft above the state's median county elevation of 138 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.
Why 20°F is the line for a garage pipe: how cold before pipes freeze.
Where this comes from
NOAA 1991-2020 climate normals, blended from 3 nearby stations and adjusted for elevation; closest is Hanover (4 mi SW), PA, 23 km away (fair match). A normal year, not tonight's forecast: check the forecast low for the night itself. Why elevation is part of the blend: how county numbers are made.