Winter Storms - Try out Scholastic's Interactive Weather Maker and learn how the wind chill factor works. - http://teacher.scholastic.com/activities/wwatch/winter_storms/
Seasons in a Spin - Explains how seasons are due to the Earth's tilt and not how far from the Sun we are. - http://www.questacon.edu.au/html/assets/pdf/Seasons_in_a_Spin.pdf
BBC: The Seasons - Find out why the seasons change. - http://www.bbc.co.uk/science/space/solarsystem/earth/solsticescience.shtml
New Science: A Change of Season - From NASA, a discussion of solstice and equinox. Includes animations explaining why the seasons happen. - http://liftoff.msfc.nasa.gov/News/2001/News-AutumnalEquinox.asp
The Seasons - A description of the seasons, and common misconceptions about what causes them. - http://csep10.phys.utk.edu/astr161/lect/time/seasons.html
Wildlife Garden - Seasons - From the Museum of Natural History, a daily photographic record showing how the Museum's wildlife garden changes over the course of a year. - http://flood.nhm.ac.uk/cgi-bin/wgarden/
Why Leaves Change Color - From the SUNY College of Environmental Science and Forestry, an article explaining what happens when leaves change colors in the Fall. - http://www.esf.edu/pubprog/brochure/leaves/leaves.htm
Seasons of the Year - First grade web quest on the seasons of the year. - http://www.viterbo.edu/academic/ug/education/edu250/korth/Web%20Quest%20Project%202.html
The Four Seasons - Includes games, coloring pages, crafts, and stationery for each of the four seasons. From PrimaryGames.com - http://www.primarygames.com/seasons/seasons.htm
NWS Winter Weather Awareness - Lists information about how to handle winter weather situations. - http://www.nws.noaa.gov/om/winter/index.shtml