The summer sun might be a breath of fresh air compared to the rain or snow of months past, but Old Spice reminds us again this year that some cities are downright sweaty in the summertime.

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The company released its Top 100 Sweatiest Cities List this week, ranking Phoenix as the the nation's top perspiration producer for the second time in four years.

Phoenix turned up the heat to jump to the top of the list after dropping to just No. 3 last year, living up to its nickname "Valley of the Sun." The city also took top honors in 2003.

Cities in Texas and Florida continued to dominate the top 10 while, for the first time, a city in Nevada cracked the top 5 with Las Vegas ranking No. 2. The least sweatiest cities include Green Bay, Wis., Colorado Springs, Colo., and San Francisco.

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The rankings are based on the average U.S. male/female height/weight and the average high temperature for 2004 in each of the cities during June, July and August. The sweat level was analyzed based on the assumption that an individual was walking for one hour.

Living in what now ranks as one of the fastest-growing cities in the nation, the average Phoenix resident produced .76 liters of sweat per hour during a typical summer day in 2004 -- more than two 12-ounce glasses of lemonade. In a two-hour period, residents of Phoenix collectively produced more than enough sweat to equal a 12-ounce glass of lemonade for everyone in the state of Arizona, according to a news release.

In recognition of the dubious award, Old Spice will be delivering a year's supply of Old Spice Red Zone antiperspirant to Phoenix Mayor Phil Gordon.

"Weather patterns are constantly changing, and this of course has a tremendous effect on where cities fall in the Sweatiest Cities ranking," said Dr. Paul Ruscher, associate professor and associate chair of meteorology at Florida State University. "While cities like Phoenix have consistently remained one of the top 10 sweatiest cities, cities like San Francisco, which ranked No. 68 last year, fell to the bottom of our list at No. 100 -- claiming the title 'Least Sweaty City.'"