From site:  Your online guide to snowflakes, snow crystals, and other ice phenomena …

Welcome to SnowCrystals.com!   This site is all about snow crystals and snowflakes — what they are, where they come from, and just how these remarkably complex and beautiful structures are created, quite literally, out of thin air.         

From site:  This standards-based Real Time Data Module has been created for use by students in the elementary grades to allow them to investigate weather phenomena both locally as well as in other places around the world.  By using  hands-on activities and real-time data investigations, the students will develop a basic understanding of how weather can be described in measurable quantities, such as temperature, wind and precipitation. The lesson plans which make up this module have been designed to allow teachers to select the ones which fit into their curriculum to allow for flexibility in implementation.

In textbook-style fashion, the site provides an overview of the atmosphere, water cycle, storms, ice and snow, forecasting and our changing climate.  Students have the opportunity to do virtual storm chasing.  The lesson concludes with links to other resources.