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Wind Chill Calculator | Get feels-like temp & frostbite risk

Quick reference

Wind chill	Frostbite risk
Above 0 °F	Low for short exposure
-1 to -18 °F	Frostbite in 30 minutes
-19 to -35 °F	Frostbite in 10 minutes
-36 °F and below	Frostbite in 5 minutes

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Interpretation guide

Factor	Effect
Higher wind speed	Strips body heat faster → feels colder
Applies at or below	50 °F and wind above 3 mph
Only affects	Exposed skin / living things, not objects

lightbulb Worked example: a 10°F morning with a 25 mph wind

The thermometer reads 10°F and the wind is blowing at 25 mph as you head out for the school run.

Result: Wind chill = 35.74 + 0.6215T − 35.75V^0.16 + 0.4275TV^0.16. With T = 10 and V = 25: 35.74 + 6.215 − 35.75(25^0.16) + 0.4275 × 10 × 25^0.16 = 35.74 + 6.215 − 59.83 + 7.15 ≈ −10.7°F, which rounds to −11°F.

What this means: At −11°F wind chill, exposed skin can develop frostbite in about 30 minutes — the number is a safety signal, not just a comfort measure. It only applies to living skin: your car engine and the pipes in the wall experience 10°F, the air temperature, regardless of wind.

Formula & methodology

Formula: WC = 35.74 + 0.6215*T - 35.75*V^0.16 + 0.4275*T*V^0.16 (T in °F, V in mph)

How wind chill is calculated

The tool applies the NWS wind chill formula WC = 35.74 + 0.6215T − 35.75V^0.16 + 0.4275T×V^0.16, where T is the air temperature in °F and V the wind speed in mph, valid for winds above 3 mph. It estimates the perceived temperature from heat loss on exposed skin.

Example: at 20°F with a 20 mph wind, WC = 35.74 + 12.43 − 51.15 + 8.55 ≈ 5.6°F — it feels far colder than the thermometer says.

Reading the result: wind chill only applies to people and animals — objects cool to the air temperature regardless of wind. The National Weather Service uses it for cold-weather advisories: at −20°F wind chill, frostbite can develop in under 30 minutes, so the number is a safety signal as much as a comfort metric.

Authoritative source: timeanddate.com

Frequently asked questions

What is wind chill?

Wind chill is the 'feels-like' temperature on a cold, windy day. Moving air carries away the warm layer next to your skin faster than still air, increasing heat loss, so it feels colder than the measured temperature. The National Weather Service uses it to warn about frostbite and hypothermia risk.

How is wind chill calculated?

The modern (2001) formula is WC = 35.74 + 0.6215T - 35.75V^0.16 + 0.4275T x V^0.16, with temperature T in °F and wind speed V in mph. At 20 °F with a 25 mph wind, the wind chill is about 2 °F. It is valid at temperatures of 50 °F or below and winds above 3 mph.

At what wind chill does frostbite occur?

Frostbite risk rises sharply as wind chill drops. Around -1 to -18 °F, exposed skin can freeze in about 30 minutes; at -19 to -35 °F, in roughly 10 minutes; and at -36 °F or colder, in as little as 5 minutes. Cover all skin and limit time outdoors in these conditions.

Does wind chill affect objects like car engines or pipes?

No. Wind chill only describes how cold it feels to exposed skin and other warm living things that are losing heat. Wind makes objects reach the actual air temperature faster, but it cannot cool them below it. A pipe will freeze based on the true air temperature, not the wind chill.

What is the difference between wind chill and the actual temperature?

The actual temperature is what a thermometer reads. Wind chill factors in how wind accelerates heat loss from your body, giving a lower 'feels-like' value. The stronger the wind, the bigger the gap. Wind chill matters for human safety and comfort, while the actual temperature governs physical processes like freezing.

How should I dress when the wind chill is far below the temperature?

Dress for the wind chill, not the thermometer. A 30°F day with a 20 mph wind feels like 17°F, so wear what 17°F demands: insulated gloves, a hat, and a windproof outer shell. The outer layer matters most, because it stops the wind from stripping the warm air your clothing traps — and keep skin covered, since frostbite risk follows the wind chill.

Why does the formula ignore winds below 3 mph?

The NWS equation is only defined for winds above 3 mph, because a near-calm breeze barely accelerates heat loss from your skin. On a still 35°F day, the feels-like temperature is effectively 35°F. That cutoff keeps the calculator from inventing a difference where your body cannot feel one.

Can wind chill freeze my pipes or drain my car battery?

No. Wind chill only describes heat loss from warm, living tissue. Wind makes a cold engine block or exposed pipes reach the actual air temperature faster, but never colder: at −5°F air with a −25°F wind chill, your pipes only ever cool to −5°F. Frostbite follows the wind chill; freeze damage follows the thermometer.

When does wind chill become a frostbite emergency?

The danger escalates fast below zero. From about −1 to −18°F wind chill, exposed skin can freeze in roughly 30 minutes; from −19 to −35°F, in about 10 minutes; and at −36°F or below, in as little as 5 minutes. At those levels, cover every patch of skin, keep outdoor time short, and treat numbness or white, waxy patches as a signal to get inside and warm up gradually.

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