Contrary to popular belief, seasons do not affect hair growth. The biggest factor when it comes to the rate of hair growth is genetics.
Some people have a faster hair growth rate, while others grow hair more slowly. Other factors that increase the growth rate of the hair includes a person's diet and the overall health of the hair. Getting hair trimmed every 3 to 4 months to do away with split ends can help it maintain its health and strand strength. Hair can also be kept healthy through eating a diet that includes lots of fruits and vegetables.