Wind-chill temperature

The problem

How cold is it outside? The temperature alone is not enough to provide the answer. Other factors including wind speed, relative humidity, and sunshine play important roles in determining coldness outside. In 2001, the National Weather Service (NWS) implemented the new wind-chill temperature to measure the coldness using temperature and wind speed. The formula is:

twc = 35.74 + 0.6215ta - 35.75v0.16 + 0.4275tav0.16

Where ta is the outside temperature measured in degrees Fahrenheit and v is the speed measured in miles per hour. twc is the wind-chill temperature. The formula cannot be used for wind speeds below 2 mph or temperatures below -58􏰀F or above 41􏰀F.

Write a program that prompts the user to enter a temperature between -58􏰀F and 41􏰀F and a wind speed greater than or equal to 2 and displays the wind-chill temperature. Use Math.pow(a, b) to compute v0.16. Here is an example run:

Enter the temperature in Fahrenheit: 5.3
Enter the wind speed in miles per hour: 6
The wind chill index is -5.56707

Breaking it down

public static void main(String[] Strings) {

    Scanner input = new Scanner(;

    System.out.print("Enter the temperature in Fahrenheit: ");
    double fahrenheit = input.nextDouble();

    System.out.print("Enter the wind speed miles per hour: ");
    double speed = input.nextDouble();


    double windChillIndex = calculateWindChillIndex(fahrenheit, speed);

    System.out.println("The wind chill index is " + windChillIndex);

private static double calculateWindChillIndex(double fahrenheit,
        double speed) {
    double windChillIndex = 35.74 + 0.6215 * fahrenheit - 35.75 *
            Math.pow(speed, 0.16) + 0.4275 * fahrenheit *
            Math.pow(speed, 0.16);
    return windChillIndex;


Enter the temperature in Fahrenheit: 10
Enter the wind speed miles per hour: 33
The wind chill index is -13.116634859307005