May Day has already brought some rioting to San Francisco, and as Dashiell Bennett‘s Atlantic Wire piece points out, New York is bracing for the same:
Tensions are likely to be pretty high, especially in New York City, [where] some leading organizers were reportedly visited at home by New York police and FBI agents yesterday who interviewed them about their plans. (The high temperatures and 80% chance of rain won’t help either.)
It’s unclear to me from that last sentence what the weather forecast “won’t help” — the demonstrators or the police? — but Bennett is right to point out a relationship between rain and rioting. What’s the relationship? The more of the former, the less of the latter. From a Times column we wrote several years back, called “The Price of Climate Change“:
It turns out that rainfall often has a surprisingly strong effect on violence. In a paper on the economic aftermath of the hundreds of riots in American cities during the 1960’s, William Collins and Robert Margo used rainfall as a variable to compare the cities where riots took place with cities where riots probably would have taken place had it not rained. Few things can dampen a rioter’s spirit more than a soaking rain, they learned. After two days of rioting in Miami in the summer of 1968 were finally quelled by rain, they write, the Dade County sheriff joked to The New York Times that he had ordered his off-duty officers to pray for more rain.