In the Subliminal Self podcast, Leonard Miodinow talked about the influence of weather on decision making. He referred to a 20 year study (the study concluded in the 1990s) which studied the influence of weather on the New York Stock Exchange. The market averaged a 7% increase on cloudy days and a 24% increase on sunny days. This effect was also observed in other stock markets. He suggests that stockbrokers were unconsciously influenced by the weather conditions, which affected their market decisions. In sunny weather, they felt more optimistic, which would make them more likely to pay more for the stocks, thus helping the stock market. I notice that I feel happier and tend to view things more positively on sunny days. After hearing this podcast, I can be more aware of how weather influences me; I will make an effort to be aware of the potential impact of weather on my thoughts, hopefully allowing me to make more rational decisions (e.g. not being pessimistic just because it is overcast).