SeasonClassification - UEA CMP

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package seasonclassification;
import java.util.Scanner;

/**
 *
 * @author udx14wfu
 */
public class SeasonClassification {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        Scanner input = new Scanner(System.in);
        int month, day;

        System.out.println("Enter a month: ");
        month = input.nextInt();
        System.out.println("Enter a day: ");
        day = input.nextInt();

        if(isValidDate(month, day)==true){
            System.out.println(findSeason(month,day));
        }else{
            System.out.println("Sorry, but the date is not valid!");
        }
    }

    public static boolean isValidDate(int month, int day){
        int[] daysCount = new int[]{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        boolean valid = false;

       if(month>=1 && month <=12){
           if((month>=1 && month<=12) && (day>=1 && day<=daysCount[month-1])){
               valid = true;
           }
       }else{
           valid = false;
       }

       return valid;
    }

    public static String findSeason(int month, int day){
        String season = null, mth = null;

        switch(month){
            case 1: mth = "January";
                break;
            case 2: mth = "February";
                break;
            case 3: mth = "March";
                break;
            case 4: mth = "April";
                break;
            case 5: mth = "May";
                break;
            case 6: mth = "June";
                break;
            case 7: mth = "July";
                break;
            case 8: mth = "August";
                break;
            case 9: mth = "September";
                break;
            case 10:mth = "October";
                break;
            case 11:mth = "November";
                break;
            case 12:mth = "December";
                break;
            }

        if(mth=="December" && day>=21){
            season = "Winter";
        }else if(mth=="December" && day<21){
            season = "Autumn";
        }else if(mth=="January"){
            season = "Winter";
        }else if(mth=="February"){
            season = "Winter";
        }else if(mth=="March" && day<=20){
            season = "Winter";
        }else if(mth=="March" && day>=21){
            season = "Spring";
        }else if(mth=="April"){
            season = "Spring";
        }else if(mth=="May"){
            season = "Spring";
        }else if(mth=="June" && day<=20){
            season = "Spring";
        }else if(mth=="June" && day>=21){
            season = "Summer";
        }else if(mth=="July"){
            season = "Summer";
        }else if(mth=="August"){
            season = "Summer";
        }else if(mth=="September" && day<=20){
            season = "Summer";
        }else if(mth=="September" && day>=21){
            season = "Autumn";
        }else if(mth=="October"){
            season = "Autumn";
        }else if(mth=="November"){
            season = "Autumn";
        }

        return season;
    }

}