>After all, there's a big difference between 60 straight days of 90 degree highs and 60 straight days of 115 degree highs.
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Originally Posted by Tony
If you had 60 (straight) days of 115 degree highs, you'd very likely be in a different heat zone than someone with 60 (straight) days of 90 degree highs.
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The guy with the 60 days at 90F would probably fall in AHS 6 or 7. The guy sweating bullets with the 60 days at 115F is probably having well over 100 days that break 86F - that would put him almost certainly upwards of AHS 8.
The system is not perfect, but it sure beats talking about USDA zones in the summertime.