Autumn is, by far, the most common season for hair shedding. This is the time of year when the hair is thinner than usual.  Winter tends to be the best hair growth season, and that is when our strands are thicker than normal. 
One study has shown that many of us tend to shed excessively during September, as we head into autumn season. We also experience a lighter shedding phase around April time (early spring).

This can differ from person-to-person, but generally speaking, our hair is at its thinnest during early autumn and early spring. The hair tends to thrive at its thickest during the peak winter months, and early in summer time. 

If you are experiencing severe cases of seasonal hair loss, then be sure to adjust your hair care plan according to the different seasons. Ease up on harsh chemical based products and heat based styling devices during the shedding seasons. Instead, opt for natural hair products. 

For more information on seasonal hair loss, you may want to read: