"Head outdoors for year-round fun with your Sims!" declares EA about new Sims 2 expansion Seasons, which features season-specific activities, weather effects and other additions: "New seasonal activities await your Sims including snowball fights, chasing fireflies, jumping in leaf piles, and more.
"Strengthen family ties in Winter, let romance bloom in Spring, deepen the bonds of friendship in Summer, or fast-track your career in Fall. Your Sims can now explore new careers and master new talents throughout the year, but beware freezing, sunburn, sneezing, and other unexpected weather effects! Dress your Sims appropriately or face the consequences!"
There's no release date for The Sims 2: Seasons as yet, but you can view a couple of screenshots on this here page. Further info can be found at the expansion's official home on the interweb.