The Felt Air Temperature Calculator estimates how the weather truly feels to humans, rather than just measuring the actual air temperature. This tool takes into account environmental factors like wind speed and humidity. In cold conditions, it uses wind chill to describe how much colder it feels due to wind. In hot and humid environments, it applies the heat index to show how much hotter it feels. The calculator is useful for weather forecasting, planning outdoor activities, and ensuring safety in extreme temperatures.
formula of Felt Air Temperature Calculator
- Wind Chill (for cold conditions):
Use this formula when the air temperature is 50°F (10°C) or below and wind speed is 3 mph (4.8 km/h) or higher:
Wind Chill (°F) = 35.74 + 0.6215 × T − 35.75 × V^0.16 + 0.4275 × T × V^0.16
Where:
T = air temperature in degrees Fahrenheit (°F)
V = wind speed in miles per hour (mph)
- Heat Index (for hot conditions):
Use this formula when the temperature is at least 80°F (27°C) and relative humidity is 40% or higher:
Heat Index (°F) =
−42.379 + 2.04901523 × T + 10.14333127 × RH
− 0.22475541 × T × RH − 0.00683783 × T² − 0.05481717 × RH²
- 0.00122874 × T² × RH + 0.00085282 × T × RH²
− 0.00000199 × T² × RH²
Where:
T = air temperature in °F
RH = relative humidity in percent (%)
Table: Quick Reference for Felt Temperature Conditions
| Condition | Air Temp (°F) | Wind Speed (mph) | Relative Humidity (%) | Felt Temperature (°F) |
|---|---|---|---|---|
| Cold Breeze | 30 | 10 | N/A | 21 |
| Winter Chill | 20 | 20 | N/A | 4 |
| Hot & Humid | 90 | N/A | 60 | 100 |
| Extreme Heat | 95 | N/A | 70 | 112 |
This table offers quick approximations of how environmental conditions affect perceived temperature.
Example of Felt Air Temperature Calculator
Example 1: Cold Day Wind Chill
Air temperature: 30°F
Wind speed: 10 mph
Wind Chill = 35.74 + 0.6215 × 30 − 35.75 × 10^0.16 + 0.4275 × 30 × 10^0.16
Wind Chill ≈ 21°F
So although the thermometer reads 30°F, it feels like 21°F outside.
Example 2: Hot Day Heat Index
Air temperature: 90°F
Relative humidity: 60%
Using the heat index formula, the result is approximately 100°F.
So even though the air temp is 90°F, it feels like 100°F to the human body.
Most Common FAQs
No, it factors in wind chill or humidity to describe how the temperature actually feels to your body.
Use wind chill for cold temperatures with wind. Use heat index for hot temperatures with high humidity.
Humidity slows down sweat evaporation, which is the body’s natural way of cooling down, making it feel warmer than the actual temperature.