It's time once again for the "Great Minnesota Get Together." Weather plays quite a role in the State Fair experience. Who doesn't remember braving the heat with the crowds on one of the busier intersections on a sweltering afternoon? A quick rain burst will send people scurrying for cover, and folks savor balmy days in the 70s with just a bit of a breeze. Below are some State Fair weather facts and some interesting weather events that have happened in past Minnesota State Fairs.
The Minnesota State Fair has been held at its current site since 1885. There were some years when the fair was not held because of war, disease or logistical reasons. These years are: 1861 (Civil War) 1862 (Civil and Indian War) 1893 (Columbian Exposition) 1945 (fuel shortage because of WWII) and the last time the fair was not held was in 1946 due to an outbreak of Polio. Beginning in 1975, the fair has a 12 day run each year ending with Labor Day. Thus since 1975, the fair begins on a Thursday in August. Before 1975 the fair was held for shorter durations (eleven days from 1972 to 1974, ten days from 1939 to 1971, eight days from 1919 to 1938 and six days from 1885 to 1918)
There can be some spells of hot weather during the Minnesota State Fair. The hottest day in the history of the Minnesota State Fair was on September 10, 1931 with 104 degrees. The hottest average temperature for the duration of any state fair back to 1885 is also 1931 with 92.6 degrees. Note that the Minnesota State fair in 1931 ran eight days from September 5-12. 2013 had the third warmest fair on record with 88.2 degrees and also had the most 90 degree high temperatures on record with six days. 2012 had the sixth warmest average maximum temperature with 87.1 degrees. The coolest Minnesota State fair was during the six day run of the fair from September 5-10 1898 with an average maximum temperature of 64.2 degrees. The coldest maximum temperature for the fair is 52 degrees on September 7, 1911 and the coldest minimum temperature is 33 degrees on September 13, 1890. The coolest fair morning in recent years was a chilly 36 degrees on September 1, 1974.
On average it rains about 3 to 4 days during the fair's 12 day run. The wettest fair was in 1977 with 9.48 inches, and the driest fair was 2003 with only .02 inch of rain.
The largest rain event in the State Fair's history was August 30, 1977. At 8:20 pm heavy rains hit the State Fair. The U of M St. Paul Campus climate observatory one mile north of the fairgrounds saw 4.06 inches of rain. This caused some of the worst street flooding seen at the fairgrounds. The bulk of the rain fell in a 3 1/2 hour period from 8:15pm to 11:45pm. The grandstand show was cancelled, and people had great difficulty trying to leave the fair. The Twin Cities International Airport saw 7.28 inches from this event, second only to the 1987 'Superstorm." People driving on I-94 leaving the fair found water "up to their hood ornaments" in low areas under bridges.
The peak of severe weather in the Twin Cities happens in June, but severe storms can and have happened during the State Fair. As recently as 2007, just two weeks before the fair was to start, a thunderstorm with high winds estimated to 67mph hit the fairgrounds. Below is an excerpt from Storm Data on August 11, 2007.
A long and wide swath of damaging wind extended from just west of the Minnesota State Fairgrounds in Falcon Heights to the northeastern corner of the city of St Paul. Approximately 4000 trees were felled. Affected neighborhoods were St. Anthony, Como and Phalen. The worst damage was in the Como Park area, where many trees fell on houses, vehicles, sheds and garages. One tree crashed into a house and destroyed it. One man was injured when a window blew in on him. At the State Fair, part of the grandstand roof was torn off, and roofs were also torn off some exhibition buildings. Dozens of vendor booths were blown around, with many severely damaged. The damage was oriented from west to east. At one point shortly after the storm, XCEL Energy reported over 250,000 outages across the Minneapolis-St. Paul region.
On August 17 1940, a severe windstorm hit the fairgrounds one week before it opened and blew down tents and damaged equipment on Machinery Hill. One of the tents downed was a block long "big top" tent that housed the International Havester Co. farm implements. Persons on the hill escaped injury.