Incopatable types [Resolved]

[OT²O]

Hey I am working on a school project and I need help with 3 errors I keep getting when I compile.

I have this array storing my strings.

private String[] months = {"January", "Febuary", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};

and I need the program to Return the Month that rainfall is the greatest.

		public double getHighestMonth(){
			double highest = values[0];
			String month = months[0];
		
			for (int index = 1; index < values.length; index++){
				if (values[index] > highest)
					highest = values[index];
					month = months[index]; 
			}
		
			return month;
		}

Here is the errors I am receiving.

RainFall.java:35: incompatible types
found   : java.lang.String
required: double
			return month;
			       ^
RainFall.java:40: incompatible types
found   : java.lang.String
required: double
			double month = months[0];
			                     ^
RainFall.java:45: incompatible types
found   : java.lang.String
required: double
				month = months[index];
				              ^
3 errors

Any help would be greatly appreciated.