We have analyzed 419 cases of Bell palsy within three years, with no evidence for an age differential in seasonal occurrence or for epidemicity. Cold weather could not be entirely ruled out in a geographic region of mild climate without wide seasonal variation. Bell palsy is probably not contagious, is randomly distributed among persons of all ages, and is not related to seasonal change.
Adour KK, Wingerd J. Nonepidemic Incidence of Idiopathic Facial Paralysis: Seasonal Distribution of 419 Cases in Three Years. JAMA. 1974;227(6):653–654. doi:10.1001/jama.1974.03230190045013
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