Smart Apps for Kids has a great list of the Top 14 FREE Educational Websites for Kids. There are a ton of good educational websites available out there, and many of them are free. Here's a list of 14 websites that we have found to be fun and educational.
Make these simple sensory bottles as a hands-on manipulative to talk about the weather. Great for circle time! I would use this in a kindergarten class. put the children in 5 groups and let them tell class mates what they think about their bottle.