Summer of 2013 was one of the hottest on record for Utah. Normally the locals escape to the canyons for relief, since it is usually 20 degrees cooler than the valleys. But 20 degrees cooler than 107 is still very hot. Nighttime lows only got to about 75. In an area that is not used to such extreme heat, it was difficult for many to cope.
Images above show The Wasatch Front and Great Salt Lake on July 22, 2013. First image is a true color, second shows night land surface temperature represented by a color ramp and the third is daytime temperature.
The bodies of water heat up and cool down slower than land, so during the day the water is cooler than it's surroundings and during the night it is warmer.
You can also notice that the mountains are much cooler than the low valleys, still warm by Wasatch Front standards, but it beats sitting in triple digit heat all day.
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