May 2015 Weather Roundup
Jun 04, 2015
May 2015 is in the weather history books and history was made for some. Overall the month ended the warmest in 3 years for the U.S. overall (6th warmest of the past 25 years) and wettest in 20 years (2nd wettest in 25 years). National temperatures were 1.1F above average and 0.4F warmer than last year. The Northeast was the hot spot trending the warmest in 25 years and exceptionally dry (2nd driest in 25 years). Polar opposite down in the South Central U.S. where it was the 3rd coldest May of the past 25 years with record shattering rainfall. Some areas in Texas-Oklahoma topped 30” for the month which in part contributed to 28 lives lost. Many areas had more rainfall than they would typically get in an entire year but this indeed erased the drought of the past few years.
National temperature trends
National temperatures vs the past 25 years
National precipitation trends
National precipitation vs the past 25 years
While Iowa received some rain in May it actually missed out on the heavier rain once again. Year-to-date the state of Iowa is still trending the driest in 21 years which poses a concern as we get into the hotter core summer months. Growing degree days across the Corn Belt from Nebraska to Pennsylvania were the most in 3 years for the month. Iowa YTD rainfall chart below doesn’t paint a favorable picture.
Severe weather wasn’t just limited to flooding as there were 273 unofficial reports of tornadoes (5 fatalities) which is more than twice last year and above the 3-year average of 173. We even had an early Tropical Storm in the Carolinas around Mother’s Day so no doubt it was an active month.
The chart below shows regional max/min temperature trends and rainfall trends by day. The wettest day of the month in the Northeast was the very last day which helped to keep the month from being the driest in 120 years.
Maps and data powered by www.weathertrends360.com, the leader in year-ahead weather forecasting using a statistical/24 climate cycle model.
Captain Kirk out