The rain wave going on in the Northeast raises the question - is the reduction in crime on rainy days a temporary phenomenon, or is it something more fundamental? In other words, would an extremely rainy decade see a reduction in crime due to the rain? I'm guessing it would be a reduction, but not as great as the daily ones seen. After all, people adapt, with umbrellas and such.

A similar phenomenon to look at is the increased birth rate observed nine months after blackouts. Blackouts probably cause some births that would have occurred in close proximity to the nine-months-later period to move to that time period, as well as causing others to occur that would not have otherwise (accidents).