It can get hot and dusty as fawk, out of 8 years this past year was the mildest for me. I actually wanted more heat and dust. Yeah it was extremely mild (if there is such an oxymoron). Didn't even have to bust out the fans and spray bottles http://cn1.kaboodle.com/hi/img/2/0/0/95/0/AAAAAg8sbTIAAAAA...

Coldstrap also makes a consumer priced cooling vest, much lighter than other types and works in humidity, see here: Cooling vests