'--Hair grows slightly faster in the hot months, suggests at least one study. A 1991 article in the British Journal Of Dermatology explored "androgen-dependent" hair growth in bald men living in temperate climate. Androgen-dependent hair includes some scalp hair and other hair whose growth is influenced by a kind of hormone called androgens. By contrast, androgens do not affect the growth in other types of hair such as eyelashes and eyebrows.
According to Tobin, the 1991 study suggested that androgen-dependent hair growth is faster during the spring and summer months and slower during the winter months in temperate regions such the US. Althought this study was conducted in men, the results may also apply to women.'
hot days and oranges :)