Here is something a friend sent to me today.
A Tale of Two Cities
Chicago, IL Houston, TX
Population 2.7 million 2.15 million
Median HH income $38,600 $37,000
% African-American 32.9% 24%
% Hispanic 28.9% 44%
% Asian 5.5% 6%
% non-Hispanic White 31.7% 26%
A reasonably similar matchup -until:
Concealed carry gun law No Yes
# of gun stores 0
84 dedicated gun shops,
1500 places to buy guns
(Walmart, etc.)
Homicides, 2012 506 207
Homicides per 100k 18.4 9.6
Average January
high temp, F 31 63
Govt Conclusion: cold weather causes murder.