April Showers Day, unlike many other American holidays, was created by the online greeting card company 123greetings.com. However, the exact year that April Showers Day was established is unknown. The term “April Showers” is well-known in the United Kingdom and Ireland. It essentially describes the heavy and rapid rain showers that are typical of April weather in the northern hemisphere, particularly in the British Isles and are caused by the jet stream’s northward movement.

Winter in the Northern Hemisphere lasts from the December solstice, which occurs on December 21 UTC, through the March equinox, which occurs on March 20 UTC. As temperatures rise in Western New York, the last bit of snow melts and turns to rain, igniting the beginnings of flowers and plants blooming in the area. The smallest possibility of rain in the U.K. this year falls between April 21 and April 27. The average sliding 31-day rainfall in April is also quite low, ranging from 1.3 to 1.8 inches (between 3.3 to 4.6 centimeters).

The saying “March winds and April showers bring forth May flowers” was first documented in English-speaking countries in 1886. The shorter, trochaic variant “April showers bring May flowers,” originally “Sweet April showers/Do spring May flowers,” was part of a poem published in 1610. The phrase is mentioned in the General Prologue of “The Canterbury Tales.” So this April Showers Day, get out your umbrella and rain shoes, and let’s stand outside to witness an amazing downpour — don’t forget your raincoat!

Resource: https://nationaltoday.com/april-showers-day/