Implementing weather changes that affect animals

Check for which season you are in

 
                if (menuOption == 1)
                {
                    TimePeriod++;
                    Season = TimePeriod % 4;
                    ShowDetail = true;
                    AdvanceTimePeriod();
                }
                if (menuOption == 2)
                {
                    TimePeriod++;
                    Season = TimePeriod % 4;
                    ShowDetail = false;
                    AdvanceTimePeriod();
                }

Winter Effects

 

        private double DistanceBetween(int x1, int y1, int x2, int y2)
        {
            if (Season==0)
            {
                return (Math.Sqrt(Math.Pow(x1 - x2, 2) + Math.Pow(y1 - y2, 2))+3);
            }
            else
            return Math.Sqrt(Math.Pow(x1 - x2, 2) + Math.Pow(y1 - y2, 2));
        }