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Something I have learned- it is not all the heat, it is not all the sun, it is not all the humidity, but it is the mixture- known as the dew point. This is what affects me the most. I got this chart from Runner’s World and I find it to be helpful. Hopefully, it will help you out too.
DEW POINT (°F) | RUNNER’S PERCEPTION | HOW TO HANDLE |
50–54 | Very comfortable | PR conditions |
55–59 | Comfortable | Hard efforts likely not affected |
60–64 | Uncomfortable for some people | Expect race times to be slower than in optimal conditions |
65–69 | Uncomfortable for most people | Easy training runs might feel OK but difficult to race well or do hard efforts |
70–74 | Very humid and uncomfortable | Expect pace to suffer greatly |
75 or greater | Extremely oppressive | Skip it or drama |