Sentence 1: On a cold day, the sky filled with thick, gray clouds. 
 Sentence 3: The snow began to fall as the sun reached its height 
 Sentence 4:  The snow fell thick and fast, and soon it lay deep on the ground 
 Sentence 5:  Winter had come at last 
 Option 1: It was cold for the first day of summer. 
 Option 2: The wind blew hard, and the birds and small animals sought shelter.