In my opinion, happiness can or can't be evaluated on such a weather condition, however, there are some people who actually live on a 'summer weather' places get used to it, and the results are obvious- they’re happy. I think the weather relation to happiness is a broad topic that can simplify in to a simple answer- it depends on what the person really like. That simple answer can also be divided in to many aspects that co-relates about definition of happiness. Some of the examples can be; birth place of the person, where person grew up, medical condition or the most common reason that I’ve heard- want some changes.
Furthermore, most of those people who’ll tell you that they more like it to live in hot places, where the ones who are used to live in a cold places, or not so hot outdoor community are have more liking in a place where they can do new things that can’t be done before. In the end, my answer response to this post, happiness can be evaluated depending on their reason.
Note: It’s my first time to post a response on this website. Please do understand my ‘bad’ English. I’m still on the process on improving my English literacy (especially on grammar).