From NASA, a discussion of solstice and equinox. Includes animations explaining why the seasons happen.

Lists information about how to handle winter weather situations.

First grade web quest on the seasons of the year.

A basic description of seasons with a diagram.

Includes games, coloring pages, crafts, and stationery for each of the four seasons. From PrimaryGames.com

A description of the seasons, and common misconceptions about what causes them.

From the SUNY College of Environmental Science and Forestry, an article explaining what happens when leaves change colors in the Fall.

From the Museum of Natural History, a daily photographic record showing how the Museum's wildlife garden changes over the course of a year.

Try out Scholastic's Interactive Weather Maker and learn how the wind chill factor works.