High temperature causes violent crime

There is a well developed literature on temperature and agression (evidence from horn-honking and baseball), but the identification of causal effects/external validity is sometimes questionable. Here's a 2007 paper I ran into that has clean statistics for violent crime in several US states (although the focus of the paper is not actually the causal affect of weather on crime).  I find the table somewhat incredible.

Author(s): Brian Jacob, Lars Lefgren, Enrico Moretti (NBER working paper)

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