5. Brownsville, TX
> Avg. number of 90°F+ days: 124
> Record high: 106°F
> Avg. daily high in July: 93.6°F
> Avg. daily high in August: 94.4°F
In Brownsville. temperatures reach at least 90°F more than once every three days, on average. While the city is among the hottest in the country, 2015 was not an especially hot year in Brownsville. With an average temperature over the course of the year of 74.6°F, 2015 was the 26th hottest year in the city since record keeping began 84 years ago.
4. Del Rio, TX
> Avg. number of 90°F+ days: 134
> Record high: 112°F
> Avg. daily high in July: 96.6°F
> Avg. daily high in August: 97.1°F
Del Rio the is the hottest city in Texas and the fourth hottest in the United States. Exceptionally hot summers certainly contribute to the unusually high number of days when temperatures exceed 90°F annually. Only three U.S. cities have a hotter average high in August than Del Rio. The city, situated along the U.S.-Mexico border, has an average high of 97.1°F in August.
3. Las Vegas, NV
> Avg. number of 90°F+ days: 135
> Record high: 117°F
> Avg. daily high in July: 104.1°F
> Avg. daily high in August: 101.4°F
With an average temperature of 71.9°F, 2015 was the second hottest year in Las Vegas since record keeping began 67 years ago. Temperatures hit at least 90°F an average of 135 days a year, the third most of any city in the country. In addition to being hot, Las Vegas is also sunny and dry. There are 210 days of clear skies in a given year, the second most of any U.S. city. Las Vegas also has only 26 days a year of any precipitation, the least of any U.S. city.
2. Tucson, AZ
> Avg. number of 90°F+ days: 146
> Record high: 117°F
> Avg. daily high in July: 99.4°F
> Avg. daily high in August: 96.8°F
Temperatures hit 90°F or higher in Tucson two out of every five days each year. Last year’s average temperature of 71.6°F was the second hottest on record in the city. The summer months can be especially hot in the Arizona city, with an average high of 99.4°F in July. The hottest temperature ever recorded in the city, however, was in June,1990, when temperatures hit 117°F, tied as the third highest temperature ever recorded in a U.S. city.
1. Phoenix, AZ
> Avg. number of 90°F+ days: 169
> Record high: 122°F
> Avg. daily high in July: 106.1°F
> Avg. daily high in August: 104.4°F
With 169 days of temperatures at or above 90°F, Phoenix is by far the hottest city in the country. Average high temperatures in July and August are 106.1°F and 104.4°F, respectively, each the hottest in the country. The city also holds the record for the hottest temperature ever recorded in a U.S. city. On June 26, 1990, temperatures hit 122°F in Phoenix. The city is also relatively dry. There are only eight days a year on average where the city gets more than a hundredth of an inch of precipitation.