Firstly, a ranking of the countries with the happiest citizens is released every year, and countries like Ireland and New Zealand have topped the list a number of times. Countries like Finland, The Netherlands, Canada, and several others also do very well. Their citizens live in countries that are nowhere near the equator, or what could be described as a "warm" climate except in summer.
Just FYI.
http://www.forbes.com/2009/05/05/wo...l-world-happiest_slide_2.html?thisspeed=25000
Of course. Warm weather has nothing to do with it. Americans are just generally too lazy to go out and enjoy winter. We'd rather complain.