Although there is a dry heat in Phoenix, it is making residents sweat. For the third time in four years, the city made the top of Old Spice deodorant's 100 Sweatiest Cities List. Procter & Gamble, the company that produces Old Spice, forms the list based on weather data from June, July and August, and estimates the amount of sweat an average person would generate walking for an hour in the average temperature in each city. In Phoenix, last year's average high temperature was 93.3 degrees. For those who want to stay dry, San Francisco, with an average summer high temperature of 63.2 degrees, was named the least-sweaty city.

The five sweatiest cities in America:

1. Phoenix
2. Las Vegas
3. Tucson, Ariz.
4. Dallas
5. Corpus Christi, Texas

The five least-sweaty cities in America:

1. San Francisco
2. Seattle
3. Spokane, Wash.
4. Portland, Ore.
5. Portland, Maine

Source: Proctor & Gamble, June 14, 2006