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Heat Index & Wind Chill Calculator

PromoteurMathématiques

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SAISIR

Processus automatique

SORTIR

Côté client

Feels Like

Enter the values on the left to see your feels-like temperature.

Résultats détaillés

Propriété	Valeur
Feels Like (°F)	-
Feels Like (°C)	-
Actual Temperature	-
Humidity / Wind	-
Difference from Actual	-
Safety Category	-
Formule utilisée	-

Safety Guidance

Safety guidance will appear once a result is calculated.

Sources: NOAA / National Weather Service Rothfusz regression for Heat Index; NWS & Environment Canada (2001) for Wind Chill. Heat Index applies above 80°F (27°C) and humidity 40%+ for best accuracy; Wind Chill applies at or below 50°F (10°C) with winds above 3 mph (4.8 km/h).

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Guide

Heat Index & Wind Chill Calculator

Find out what the weather really feels like. This calculator combines temperature with humidity (for hot days) or wind speed (for cold days) to produce a “feels like” temperature using the official NOAA / National Weather Service formulas, then maps the result to a color-coded safety category so you can plan outdoor activity at a glance.

Comment utiliser

Choisir un mode : Heat Index (hot & humid) or Wind Chill (cold & windy).
Choose your temperature unit (°F or °C) and enter the air temperature.
For Heat Index, enter the relative humidity (0–100%). For Wind Chill, choose a wind-speed unit and enter the wind speed.
The “feels like” temperature, safety category, and full breakdown update automatically as you type.

Caractéristiques

NOAA Heat Index – NWS Rothfusz regression with low-RH and high-RH adjustments, falling back to the simple Steadman screen below 80 °F.
NWS Wind Chill – 2001 National Weather Service / Environment Canada formula, valid for air temps ≤ 50 °F (10 °C) and winds > 3 mph (4.8 km/h).
Flexible units – Switch between Fahrenheit / Celsius and mph / km/h / m/s / knots without losing your input.
Safety categories – Color-coded badges from Caution to Extreme Danger, with concise guidance on what to do.
Detailed breakdown – Shows feels-like in both °F and °C, the actual temperature, the secondary input, and how far the perceived temperature deviates from the thermometer reading.
Privacy-friendly – Everything runs in your browser; nothing is sent to a server.

When to Use Heat Index vs. Wind Chill

Utilisez Heat Index on warm days when humidity makes the air feel oppressive — typically when the air temperature is at least 80 °F (27 °C) and relative humidity is 40% or higher. Use Wind Chill on cold days when wind is the dominant factor — usually at or below 50 °F (10 °C) with winds above 3 mph (4.8 km/h). Outside those ranges, the perceived temperature is essentially the same as the actual air temperature.

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 FAQ

What is the Heat Index and how is it different from the actual temperature?

The Heat Index is an estimate of the temperature your body actually feels when relative humidity is combined with the air temperature. As humidity rises, sweat evaporates more slowly, so your body cannot cool itself as efficiently. The Heat Index can be many degrees higher than the thermometer reading and is the figure used by the U.S. National Weather Service to issue heat advisories.
How does Wind Chill work?

Wind Chill describes how cold it feels on exposed skin when wind strips away the warm layer of air your body radiates. The 2001 NWS / Environment Canada formula uses temperature and wind speed measured at face height (about 5 ft / 1.5 m) and is valid for air temperatures at or below 50 °F (10 °C) and wind speeds above 3 mph (4.8 km/h).
Why do meteorologists use formulas instead of just a thermometer?

A thermometer only measures the ambient air. Humidity, wind, and sun exposure all change how that air interacts with your body, so two locations with the same air temperature can feel very different. The Heat Index and Wind Chill formulas convert those environmental conditions into a single number that better reflects physiological risk and helps people decide what to wear and how long to stay outside.
What humidity and temperature ranges make Heat Index meaningful?

The Rothfusz Heat Index regression was derived for warm, humid conditions. It is most accurate when the air temperature is at least 80 °F (27 °C) and relative humidity is roughly 40% or higher. Below those thresholds, the body cools efficiently and the perceived temperature is essentially the actual air temperature.
Are there other 'feels like' formulas, and which one is correct?

Yes. Australia uses the Apparent Temperature (AT) formula that adds radiation and vapor pressure, and the WBGT (Wet Bulb Globe Temperature) is used in athletics and industrial safety because it also accounts for sunlight and ground reflectance. None of them is universally 'correct' — each was calibrated for a specific climate and use case. The NOAA Heat Index and NWS Wind Chill remain the standard references in North America.

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