I get an error message on my code below. How can I fix it?

import java.util.Scanner;

public class CelsiusToFahrenheit {


public static void main (String [] args) {
Scanner scnr = new Scanner(System.in);

double tempF;
double tempC;

System.out.println("Enter temperature in Celsius: ");
tempC = scnr.nextDouble();

System.out.print("Fahrenheit: ");
System.out.println(tempF);
return;
}
}


CelsiusToFahrenheit.java:16: error: variable tempF might not have been initialized
System.out.println(tempF);
^
1 error