Heat and humidity levels have been building this week, but have yet to reach the hottest levels seen earlier this year. The featured chart presents the year maximum heat index value as calculated by the IEM based on available hourly temperature and dew point observations. The top panel shows the frequency of the yearly max at or above a given level. The bottom panel shows the simple yearly max. The maximum value shown came back in 1936 on 25 July with a temperature of 111 and dew point of 70 degrees. It is difficult to access the accuracy of that observation back then, but it does not seem impossible given the very hot weather that day.

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