Cooling Your Wort December 17 2014
When brewing in the winter, you might be tempted to cool your boiling wort in a bank of snow (a la Jack in The Shining). But beware! Yes, that snow will chill the kettle for a short time, but quickly it will start to act as an insulator and have the opposite effect you intended.
A more productive way to use snow would be in your ice bath as you chill. You can also add a copper wort chiller to the equation for optimal cooling.