About PipeFreezeNights
Why this exists
People search "how cold before pipes freeze" the evening a hard freeze shows up in the forecast. Most answers give one number, usually 20°F, and stop. The honest answer depends on where the pipe runs and on how often your county actually gets that cold. PipeFreezeNights puts both in one place for 3,140 counties: the four temperatures that matter, and how many nights a normal year brings each of them.
Where the numbers come from
Every county page is built from NOAA's 1991-2020 US climate normals: for each weather station, the average number of nights a year the low drops below 32, 20, 10 and 0°F, month by month, plus the dates the first and last freezes usually fall. A county's figure blends the nearest stations and corrects for elevation; how that works, and where it is weakest, is in how the county numbers are made. The thresholds themselves are explained in how cold before pipes freeze.
What this site will not tell you
It will not tell you whether your pipes will freeze tonight. A normal year is an average; the forecast low for the night itself, the wind on that wall and how your house was built decide tonight. Every page says so. It also does not estimate the odds of a burst, because no public source measures them.
Who runs this
PipeFreezeNights is an independently run site. It is not affiliated with NOAA, any utility, insurer, plumber or product maker. If a page ever carries a sponsored link, that is disclosed on the page itself and in the privacy policy.
Written by
Each county page is generated by AI software from the cited NOAA data - no journalist or editor writes or reviews a page before it publishes. The temperatures and night counts come from NOAA station records, not from AI; the AI only assembles the sentences around them.