Can wind chill freeze pipes if the temperature is 35 degrees?

Heating & HVACNOAA / NWS National Standard

Wind Chill Temperature Calculator (NWS Formula)

Calculate official NOAA National Weather Service wind chill index temperature and frostbite exposure times based on ambient temperature and wind speed.

Heating & HVAC Field StandardsNOAA / NWS National Standard

Engineering formulations calibrated to IPC, UPC & NEC specificationsSub-Zero Cold Climate Tolerances

Quick Summary & Key Answer

The National Weather Service wind chill formula is: Twc = 35.74 + 0.6215(T) - 35.75(V^0.16) + 0.4275(T)(V^0.16), where T is temperature in °F and V is wind speed in MPH. An air temperature of 5°F with a 25 MPH wind produces an official wind chill of -17°F, dramatically accelerating heat loss and pipe freeze risk.

Wind chill only affects warm bodies and heated structures; inanimate objects will not cool below actual air temperature.
Wind accelerates crawlspace building infiltration, freezing uninsulated pipes in hours.
Frostbite occurs in under 10 minutes at wind chills below -35°F.

Interactive Calculator

Adjust inputs for real-time results

Air Temperature°F

°F

Sustained Wind SpeedMPH

MPH

Calculated OutputLittle Danger (> 30 min)

Feels-Like Wind Chill Temperature

-17°F°F

Ambient Air Temperature: 5°F (-15.0°C)
Sustained Wind Speed: 25 MPH (40.2 km/h)
Plumbing Freeze Risk: High (Crawlspaces & Rim Joists Freeze Rapidly)

Note: NWS Wind Chill formula applies to temperatures at or below 50°F and wind speeds above 3.0 MPH.

Wind Chill & Pipe Freezing

Wind drives cold air through foundation vents and sill plate gaps, directly freezing domestic copper lines.

Frequently Asked Questions

Common questions regarding this calculation and code compliance

No. Wind chill cannot cool any inanimate object below actual ambient air temperature. If the air is 35°F, pipes will not freeze regardless of wind speed.