Overview
May 31 is the 151st day of the year (152nd in leap years) in the Gregorian calendar. In both ordinary and leap years there are 214 days remaining after May 31. As with any calendar date, its significance varies by country, culture and historical period: it can be ordinary, commemorative or associated with specific events.
Characteristics and calendar context
May 31 falls near the middle of late spring in the Northern Hemisphere and late autumn in the Southern Hemisphere. It is often a transitional day in seasonal calendars: gardens and agriculture are advancing toward summer in temperate regions, while people in the Southern Hemisphere move into cooler months.
Historical events and notable occurrences
- Natural disasters and industrial accidents: one widely remembered event that occurred on this date is the Johnstown Flood of 1889 in Pennsylvania, which had a large human toll and influenced flood control and emergency response discussions thereafter.
- Political and military actions, treaties and local milestones across different nations have been recorded on May 31 in various years; the date appears repeatedly in chronologies of national histories.
Observances and cultural significance
May 31 is designated by the World Health Organization as World No Tobacco Day, an annual campaign established to draw attention to the health risks associated with tobacco use and to encourage policies to reduce smoking worldwide. Other observances on this date may be national, religious or local and vary each year.
Births, deaths and cultural notes
Several prominent figures were born on May 31, and it is sometimes cited in lists of artists, politicians and entertainers. For example, the American poet Walt Whitman, whose work became influential in 19th-century literature, was born on May 31, 1819. Contemporary public figures also share the date as a birthday, and it is commonly used as an anchor for anniversaries and commemorations in cultural histories.
Why the date matters
Like other dates, May 31 serves as a reference point for anniversaries, remembrance and seasonal activities. It may be chosen for public campaigns, memorials or civic observances. Its placement in late spring gives it practical associations with the end of school terms, the start of summer planning in many countries, and a moment for reflection on events that occurred on that day in prior years.