Christ our savior isn't just the reason for this season. As the Creator of the universe he is the reason for all seasons.
"In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God. All things were made through him, and without him was not any thing made that was made" (John 1:1-3).
"He is the image of the invisible God, the firstborn of all creation. For by him all things were created, in heaven and on earth, visible and invisible, whether thrones or dominions or rulers or authorities—all things were created through him and for him" (Colossians 1:15-16).
"But in these last days he has spoken to us by his Son, whom he appointed the heir of all things, through whom also he created the world" (Hebrews 1:2).