It happens all the time in Missouri, not in very many other places, as if Missouri were the land of paradox and the fantastical. From 100 degrees Fahrenheit at 100 percent humidity to crippling far-below-zero Polar Vortex, even our seasons aren't predictable: they could be long, short, too early, too late to start, too cold, too wet; and the seasons have harbingers that are sometimes false (such as this year's cool August leading into hot days in early September) and sometimes true, such as hot weather beginning in early March for the record-setting sizzling summer of 2012.
Behold, then, the maker of rainbows: the sun shower. Many other nations call this phenomenon "The Wolf's Wedding" or some variation on that, such as "a witch is getting married," or "monkeys are getting married." That's according to Wikipedia. U.S. old-timers, reflecting the hard times they had to live in, are likely to say when it sun-showers, "The devil is beating his wife" -- and the rain equals her tears. Last evening we got a great sun-shower example (21 seconds) and no one was harmed.