Hi, I'm new to this board and I love it! I have definately found that my candles burn differently in humid conditions. When I test burn in the summer, I always make sure the air conditioning is on. Otherwise, I get a weak flame. I have found when I burn up at our lake house, that too effects the burn. That would figure, when it's the slow season and we have time to test, that's when it's most difficult to get a true test! Just one more variable we candlemakers have to put up with! ~Dana