See this article on how they are using crowdsourced reports of temperature, weather, and snow to understand the weather and make predictions: http://www.forbes.com/sites/brucedorminey/2014/02/26/crowdsourcing-as-the-future-of-weather-forecasting/

The US Meteorological services have launched this app to help you do this too: http://www.nssl.noaa.gov/projects/ping/

Gopal