interestingly enough, the finishing times in 2018 were faster than the finishing times from the relatively warm 2017 Boston Marathon.
2018 : 500th place : 2:48:13
2017 : 500th place : 2:48:41
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2018 : 1000th place : 2:54:43
2017 : 1000th place : 2:56:08
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2018 : 4000th place : 3:13:45
2017 : 4000th place : 3:16:47
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2018 : 6000th place : 3:22:49
2017 : 6000th place : 3:26:04
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bottom line : the results indicate that the weather conditions yielded faster finishing times in 2018 than the previous year.