Noted: Another, and probably underestimated, factor may be the weather. Mississippi summers usually see average temperatures rise above 80℉ (26.7℃), a threshold at which the likelihood of violence in prisons increases.
That is the finding of a working paper by Anita Mukherjee of the University of Wisconsin-Madison and Nicholas Sanders of Cornell University. The authors matched county-level weather variations across Mississippi with violent incidents reported in the state’s 36 prisons and jails between 2004 and 2010. Using these data, they built a statistical model that controlled for the time of year that the violence took place, the type of institution and other factors. They calculated that on days with average temperatures of 80℉ or higher the chances of violence increased by 20%. The hot weather leads to an average of 44 additional incidents of severe violence—those that result in serious injury or death—each year,