Several websites track Chicago murder count, easily located via search engine. Per Chicago Tribune, one murder thus far in 2014, 75% reduction for the same period in 2013. Expect Chicago pols will ignore the weather and take credit for the stats.
Now go look at the temperature & weather for this past weekend back in 2013 and compare it to this weekend where it's been snowing like crazy and we have record cold.
Wanna bet the weather was much more moderate last year? (I already know it was, I live in the Chicago area.)