Will Pipes Freeze in Clark County, IL? 36 nights a Year
Freeze nights in Clark County
In a normal year Clark County, IL gets 36 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 | 111 nights |
| Bare pipe in garage, attic or outside wall | 20°F | 36 nights |
| Insulated pipe in unheated space | 10°F | 14 nights |
| Inside the heated house | 0°F | 4 nights |
Foam-sleeving a bare pipe in unheated space takes it from 36 nights of risk to 14 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 04/14. For 20°F: 11/19 to 03/16.
How cold Clark County nights get
Average winter (Dec-Feb) low: 22°F; the coldest month, January, averages 19°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, November, December: 14 nights a year, and 4 nights below zero.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 19°F | 22°F | 32°F | 43°F | 54°F | 63°F | 66°F | 64°F | 55°F | 44°F | 33°F | 24°F |
Clark County next to its neighbours
Vigo County, IN, 36 km east, gets 39 nights below 20°F to Clark County's 36 nights.
| County | Distance | Below 32°F | Below 20°F | Jan low |
|---|---|---|---|---|
| Clark County, IL | - | 111 nights | 36 nights | 19°F |
| Vigo County, IN | 36 km east | 114 nights | 39 nights | 20°F |
| Crawford County, IL | 37 km south | 113 nights | 40 nights | 20°F |
| Edgar County, IL | 39 km north | 117 nights | 44 nights | 17°F |
| Cumberland County, IL | 39 km west | 113 nights | 38 nights | 20°F |
| Coles County, IL | 42 km northwest | 106 nights | 38 nights | 21°F |
| Sullivan County, IN | 42 km southeast | 105 nights | 36 nights | 22°F |
Clark County within IL
Clark County ranks 73 of 102 IL counties for nights below 20°F. The most is Jo Daviess County, IL at 76 nights, with a 14°F average winter low. The fewest is Alexander County, IL: 21 nights, winter lows near 29°F. At 607 ft, Clark County sits close to the state's median county elevation of 632 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 Casey, IL, 16 km away (close 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.