Radio Heating Up

Another thing everyone's probably unconsciously aware of but doesn't really notice is the loose correlation between weather and crime. In general, a drop in temperatures usually equates to a drop in crime—when winter really hit Toronto and the city fell to below freezing, the radios went largely silent. The exact opposite holds true when it starts warming up.
Article
http://www.vice.com/read/the-mostly-terrible-things-i-learned-by-listening-to-police-scanners-for-six-months-637