public void setSeason() {
		// march, april, may: Spring
		// june, july, august: Summer
		// september, october, november: autumn
		// december, january, february
		int index = getMonth().index();
		season = Season.SPRING;
		switch (index) {
			case 3:
			case 4:
			case 5:
				season = Season.SPRING;
				break;
			case 6:
			case 7:
			case 8:
				season = Season.SUMMER;
				break;
			case 9:
			case 10:
			case 11:
				season = Season.AUTUMN;
				break;
			case 12:
			case 1:
			case 2:
				season = Season.WINTER;
				break;
			default:
				season = Season.SPRING;
		}

	}