rain

Given Seattle's solid reputation for rain, it must be one of the wettest cities in America, right? Actually, it's not even close. As it turns out, among the nation's 50 largest cities in terms of precipitation Seattle doesn't even rank in the top half. However, it is tied with Buffalo for the nation's dreariest.
As amphibians, toads prefer a wet environment. Those that live in arid regions hide during dry spells underground, where the soil is moist, and they emerge from their shelter when the rain returns. But given that the subterranean soil they inhabit is already damp, how do the toads know when it's raining?