Combinations of e, f, or g (+/- no wind) can pose a major thermoregulatory challenge.ĭown in Minneapolis we have been suffering through the first heat wave of the year during the past week (and expected to continue next week) with temperatures in the upper 90 degrees range every day, so I was imagining conditions would not be good for Grandma’s in 2021. Of these, I would define b as “dream conditions” (sometimes the strong tailwind version of c is also part of the “dream” package). Another important factor is probably that that course is relatively flat – total elevation gain (sum of the “ups”) is only about 700 feet (with no big hills) and there is a net loss of about 130 feet from start to finish (the sum of the “downs” is about 830 feet).įlatness is guaranteed but, alas, Grandma’s does not always have perfect running weather! Ask a group of people who are veterans of the race and several will probably be eager to re-tell their favorite weather story likely to include one to several of the following elements: a) a miserable drive up Interstate 35 on a sweltering (over 90 degrees) Friday evening (plus or minus embellishments like a non-functioning car air conditioner and/or unhappy accompanying children and/or spouse), b) a gloriously cool air mass and lots of clouds (in the stories I have heard this is often recalled as arriving miraculously overnight like an answer to prayers), c) a headwind or a tailwind or no wind, d) drenching rainfall, e) cloudless sky with baking sun, f) high temperatures, or g) humidity way too high for human sweating to work well as a cooling mechanism.
An important part of what has attracted so many runners to Grandma’s Marathon from far away probably is the hope that it will have reasonably cool temperatures even though it takes place only a couple of days before the summer solstice.
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