April showers bring May flowers, including the Flower Moon.The full moon reached peak illumination at 12:56 p.m. on Monday but it will appear full for several more days. The Old Farmer's Almanac details specific moonrise times for ZIP codes across the U.

According to NASA, an Old English name for the May full moon is the milk moon. In 703 AD, the English monk St. Bede the Venerable wrote that May was known as the "Three-Milkings Month," likely because cows could be milked three times a day during this fertile time of year.

When should I look up? May's full moon, best known as the flower moon, is due to reach its peak illumination Monday.