There's nothing much we can do about it. Whatever the season, God have reasons. Don't let bad weather stop you from doing what you want to do. Falling leaves can't mess up your life. Don't let depression take you instead go out and appreciate what autumn can give you.
There's purpose for everything. The best thing we can do is to thank God for allowing us to see the day and night, for still having someone by our side whatever weather and for all the blessings that He continuously showers us each day of our lives.
If the only prayer you ever say in your entire life is thank you, it will be enough.- Meister Eckhart