Here's what I have in my notes from Elaine's answer to a similar question:
"season: From The Perigee Visual Dictionary of Signing by Rod Butterworth and Mickey Flodin. Here is what they say: "Rotate the thumb side of the right "s" hand in a circle on the left flat palm."
Let me add a few notes to that: The left hand is held in front of the body, fingertips pointing upward, palm facing to the right. The right "s" hand is going to make the circle forward and then back as you pull it toward you."
We do have sketches for the seasons' signs here: http://www.lessontutor.com/ees_time_pt2.html but you're right, we do not have word descriptions for those answers done yet. Slowly, very slowly I'm working through the lessons.