Conditions: Rounds of heavy rainfall broke monthly records for May across the plains, flooding rivers and fields—many locations received more than a foot of rain for the month. Floods hit hard In Oklahoma, where the statewide average rainfall was 14.41 inches in May, shattering the previous monthly record of 10.75 inches in October 1941 (The previous record for May was 10.54, set in 1957). As noted below, more precipitation could be on the way, according to NOAA climatologists. Of the many consequences, the heavy rains delayed wheat harvest somewhat, but more notably hindered row-crop seeding.