When the weather is colder in NYC, there are fewer rat sightings. But don't be fooled -- it's not because there are magically fewer rats, but instead likely due

When the weather is colder in NYC, there are fewer rat sightings. But don't be fooled -- it's not because there are magically fewer rats, but instead likely due to several confounding factors such as being darker more often while people are rat-watching, colder weather driving rats to stay indoors more often, and more rain/snow/slush making the furry rodents harder to spot.