Population 2.7 million 2.15 million
Median H H Income $38,600 $37,000
% African-American 38.9% 24%
% Hispanic 29.9% 44%
% Asian 5.5% 6%
% Non-Hispanic White 28.7% 26%
Pretty similar until you compare the following:
Chicago, IL Houston, TX
Concealed Carry Legal No Yes
# of Gun Stores None 184 gunstores, 1500 legal places to buy guns
Homicides, 2012 1,806 207
Homicides per 100 K 38.4 9.6
Avg. Jan. high temp. (F) 31 63
Conclusion : Cold weather causes murders. This is due to global warming.