We need seasonal changes, natural disasters like earthquakes, floods, severe storms, blizzaards. Then we could have 50 holidays spread out through the month, with a festival that occurs at the beginning and end of every month.
Floods and earthquakes should be shouts! But yeah, I agree. They included almost all of the seasons in specific regions of Skyrim, but they don't change. Riften has fall, Solitude has spring, Windhelm, Dawn Star and Winterhold have winter, Whiterun, Falkreth, and Riverwood have summer.