Climate scientists tell us that when April showers arrive, they may come with heavier downpours as the planet warms. It’s not just April: more water can evaporate into a warmer atmosphere at all times of the year, and what goes up must eventually come down. (Thank you, Clausius-Clapeyron.)
The data in these graphics come from 207 airports across the continental U.S. where records have been reliable and continuous since at least 1950. And the data show very clearly that there’s been an upward trend in rainfalls of 1”+, 2”+, and 3”+ nationwide with respect to the average from 1950 to 2014.