May 5月
（重定向自May sickness）
![The Lily of the Valley](/Images/godic/202501/26/Lily_of_the_valley2937.jpg")
![May, from the Très Riches Heures du Duc de Berry](/Images/godic/202501/26/Frères_Limbourg_-_Très_Riches_Heures_du_duc_de_Berry_-_mois_de_mai_-_Google_Art_Project2937.jpg")
![May, Leandro Bassano](/Images/godic/202501/26/Mai_Leandro_Bassano2937.jpg")
![Rosa chinensis, the flower symbol of May](/Images/godic/202501/26/Rosa_chinensis2938.jpg")
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May is the fifth month of the year in the Julian and Gregorian Calendars and one of seven months with the length of 31 days.
May is a month of spring in the Northern Hemisphere and autumn in the Southern Hemisphere. Therefore, May in the Southern Hemisphere is the seasonal equivalent of November in the Northern Hemisphere and vice versa. Late May typically marks the start of the summer vacation season in the United States and Canada and ends on Labor Day, first Monday of September.