Here is a look at some Memorial Day weather statistics for Dayton, with data going back to 1894. Memorial Day was originally celebrated each year on May 30th, until federal law moved the holiday to the last Monday of May beginning in 1971. Note that because the holiday falls on different days from year to year, the "normals" shown below have been averaged over the last week of May. As can be seen in the data below, there has been a fairly wide spectrum of temperatures and precipitation amounts on Memorial Day in Dayton, but high temperatures have generally been in the 70s and low temperatures in the 50s/60s. It is also not uncommon to see some rain in Dayton on Memorial Day.
Memorial Day Climate Extremes (1894-2013):
Warmest High Temperature: 95 degrees (1895)
Coldest High Temperature: 55 degrees (1996)
Coldest Low Temperature: 40 degrees (1947)
Warmest Low Temperature: 72 degrees (1942)
Most Precipitation: 1.98 inches (1905)
Memorial Day Climate Normals (1981-2010):
Normal High Temperature: 75 degrees
Normal Low Temperature: 55 degrees
Normal Precipitation: 0.15 inches
Below are graphs showing the frequency distribution of Memorial Day high/low temperatures and precipitation for Dayton. Click here for a full listing of Dayton's Memorial Day climate records.