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How does this compare with US sites in mid-summer? Consider Oklahoma City, a central US city which is located in a farming region and is by no means the hottest place in the US:
A striking feature of this temperature curve is its normal distribution. This is a bell curve, quite different from the "two-humped" pattern recorded from Melbourne. And unlike Melbourne, Oklahoma City is powerfully and relentlessly hot. Its average daily high temperature for July is 92.8°F. Measured daily at 3 p.m., Oklahoma City has 95% of all temperatures above 80°F. 13% are above 100°F. And the difference in heat stress posed by these cities is not offset by relative humidity: Oklahoma City's average 3 p.m. heat index, which accounts for both air temperature and relative humidity, is 19°F higher than Melbourne's. The organizers of tennis tournaments in Oklahoma City have no Rule. As best can be determined, children and teen-agers who play in tennis tournaments there will have less protection from heat-related illness than the elite international tennis professionals who play in Melbourne. The reader is left to draw his own conclusions about the sensibility of this system.
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