Mean average temperature was 57.6 degrees F in May 2017 in Grand Rapids, Michigan. The mean for May is 57.9.
The lowest minimum temperature was 31. The mean for May is 32.
The highest maximum temperature was 88. The mean for May is 86.
Precipitation was 1.5 inches. The mean for May is 3.44. Fifteenth driest May on record.
May snowfall was 0.0 inches. The mean for May is 0.2.
Heating degree days came to 247. The mean for May is 252. The total through May from July 2016 comes to 5613 vs. mean to date of 6653. The heating season to date has been about 15.6% warmer than normal.
