Another summer gone. Time for school, work, and colder weather. Every year I see the people I'm close with and myself slowly become less content and less cheerful as we dip into the bitter, cold Minnesota winters. I eventually came to the conclusion that the weather was to blame for these dreary vibes. And, when I did a few Google searches, I found the truth and my proof.

The amount of sunlight directly correlates to our level of happiness. Sunlight triggers chemical reactions that make us more alert and happy. Proof: sunlight slows down the production of melatonin, the hormone that makes humans tired and sleepy. Sunlight is also used in our bodies to produce serotonin, a common hormone in antidepressants and one that improves neurotransmission.

Temperature can affect mood. When bodies get exposed to colder temperatures, it takes more energy to keep the body at body temperature. This can result in a worsened immune system and a higher risk for sickness or infection, both of which can affect mood.

It is proven that lack of sleep can lead to depression, and weather can affect sleep. Sleeping in colder temperatures is harder and results in a lighter state of sleep.

Rain or snow has certain effects as well. Both usually result in staying inside and, therefore, less socialization, a key component to happiness and emotional stability.

Other health issues related to weather (that aren't so obvious):

As atmospheric pressure decreases, so can blood pressure.

Changes in barometric pressure can cause joint pain and headaches.

Cold fronts result in blood thickness increasing, a problem mostly concerning diabetics.

So, when work gets tough and the reality that it is too cold for backyard BBQs finally hits, we can find some comfort in being able to blame our troubles on the weather.