How to calculate feels like temperature

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:

1. Convert temperature from Celsius to Fahrenheit:

T(°F) = 30 × (9/5) + 32 = 86

2. Plug 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

3. Convert Heat Index back to Celsius:

HI(°C) = (99.3 - 32) × (5/9) ≈ 37.4

Therefore, the "feels like" temperature is 37.4°C.