Let’s consider a wind speed of 11km/hr., actual temperature of 30 degrees C, and humidity of 79%. Now we calculate feels like temperature as follows:
Feels Like Temperature Calculation
To calculate the "feels like" temperature, we can use the Heat Index formula. The Heat Index (HI) is a measure of how hot it really feels when relative humidity is factored in with the actual air temperature. The formula for calculating the Heat Index (HI) is:
HI = c1 + c2T + c3R + c4TR + c5T2 + c6R2 + c7T2R + c8TR2 + c9T2R2
Where:
- T is the temperature in degrees Fahrenheit.
- R is the relative humidity as a percentage.
- The constants are:
- c1 = -42.379
- c2 = 2.04901523
- c3 = 10.14333127
- c4 = -0.22475541
- c5 = -6.83783 × 10-3
- c6 = -5.481717 × 10-2
- c7 = 1.22874 × 10-3
- c8 = 8.5282 × 10-4
- c9 = -1.99 × 10-6
First, we need to convert the temperature from Celsius to Fahrenheit:
T(°F) = T(°C) × (9/5) + 32
T(°F) = 30 × (9/5) + 32
T(°F) = 86
Next, we can plug the values into the Heat Index formula:
HI = -42.379 + 2.04901523 × 86 + 10.14333127 × 79 + (-0.22475541 × 86 × 79)
+ (-0.00683783 × 862) + (-0.05481717 × 792)
+ (0.00122874 × 862 × 79) + (0.00085282 × 86 × 792)
+ (-0.00000199 × 862 × 792)
HI ≈ 99.3
Converting this back to Celsius:
HI(°C) = (99.3 - 32) × (5/9) ≈ 37.4
So, the "feels like" temperature is about 37.4°C.
Calculations Summary:
- Convert temperature from Celsius to Fahrenheit:
- Plug values into the Heat Index formula:
- Convert Heat Index back to Celsius:
T(°F) = 30 × (9/5) + 32 = 86
HI = -42.379 + 2.04901523 × 86 + 10.14333127 × 79 + (-0.22475541 × 86 × 79)
+ (-0.00683783 × 862) + (-0.05481717 × 792)
+ (0.00122874 × 862 × 79) + (0.00085282 × 86 × 792)
+ (-0.00000199 × 862 × 792)
HI ≈ 99.3
HI(°C) = (99.3 - 32) × (5/9) ≈ 37.4
Therefore, the "feels like" temperature is 37.4°C.
