List of Blue Moons (1900 – 2100)
A blue moon is typically considered as the second of two full moons occurring in the same calendar month, or the third full moon in a season with four.
There are exactly 158 blue moons between 1900 and 2100 including both monthly blue moons and seasonal blue moons.
How many blue moons can occur in a year?
Typically only one blue moon will occur in a year that has an extra full moon, but occasionally there will be two and on a very rare occasion three. It is possible, but rare for a year to have 2 calendar blue moons and one seasonal blue moon.
In 2026, there was one calendar blue moon May. May had two full moons making the full moon on May 31st a blue moon.
In 2027, there will be one seasonal blue moon in May. Spring will have four full moons making the full moon on May 20th a blue moon.
Related: When is the next blue moon?
Years with a double blue moon
A double blue moon is typically defined as a year with 13 full moons and 2 calendar blue moons. There will be blue moon in January followed by a second full moon in either March or April depending on how the calendar aligns. February will not have a full moon in that year.
The next double blue moon will be in 2037. The calendar last hand one in 2018.
The years with double blue moons include
- 1915: January and March
- 1961: January and April
- 1980: January and March
- 1999: January and March
- 2018: January and March
- 2037: January and March
- 2075: January and April
- 2094: January and March
And while this may be the typical defintion of a double moon, 1934 and 2048 each have a calendar blue moon and a seasonal blue moon. 1934 is also of note because the way the lunar calendar aligned, the year only had 12 full moons, not the expected 13 when there is a calendar blue.
Related: When was the last blue moon?
Years with 3 Blue Moons
A year can have three blue moons if it has a double blue moon at the beginning of the year year followed by a seasonal full moon in Summer or Autumn.
The years with three blue moons include
- 1915: January and March, and a seasonal blue moon in August
- 1961: January and April, and a seasonal blue moon in November
List of Blue Moons (1900 to 2100)
The following blue moons are the second full moon in a month, also called a calendar blue moon.
- July 31, 1901
- March 31, 1904
- October 31, 1906
- August 31, 1909
- May 30, 1912
- January 30, 1915
- March 31, 1915
- September 30, 1917
- July 30, 1920
- April 30, 1923
- October 31, 1925
- August 30, 1928
- May 31, 1931
- December 31, 1933
- March 30, 1934
- September 30, 1936
- July 31, 1939
- April 30, 1942
- October 31, 1944
- August 31, 1947
- May 31, 1950
- December 31, 1952
- October 31, 1955
- July 30, 1958
- January 31, 1961
- April 30, 1961
- November 30, 1963
- August 30, 1966
- May 31, 1969
- December 31, 1971
- October 30, 1974
- June 30, 1977
- January 31, 1980
- March 31, 1980
- November 30, 1982
- July 31, 1985
- May 31, 1988
- December 31, 1990
- August 31, 1993
- June 30, 1996
- January 31, 1999
- March 31, 1999
- November 30, 2001
- July 31, 2004
- May 31, 2007
- December 31, 2009
- August 31, 2012
- July 31, 2015
- January 31, 2018
- March 31, 2018
- October 31, 2020
- August 30, 2023
- May 31, 2026
- December 31, 2028
- September 30, 2031
- July 31, 2034
- January 31, 2037
- March 31, 2037
- October 31, 2039
- August 30, 2042
- May 30, 2045
- January 30, 2048
- September 30, 2050
- June 30, 2053
- March 31, 2056
- October 31, 2058
- August 30, 2061
- April 30, 2064
- December 31, 2066
- September 30, 2069
- May 31, 2072
- January 31, 2075
- April 30, 2075
- October 31, 2077
- July 31, 2080
- May 31, 2083
- December 30, 2085
- August 31, 2088
- June 30, 2091
- January 31, 2094
- March 31, 2094
- October 31, 2096
- July 31, 2099
Related: When is the next Super Blue Blood Moon?
Seasonal Blue Moons
Looking at the other defintion of a blue moon where it is the third full moon in a season with four, the following years will have a seasonal blue moon.
- May 22, 1902
- February 19, 1905
- August 23, 1907
- August 20, 1910
- May 20, 1913
- August 24, 1915
- August 22, 1918
- May 21, 1921
- May 18, 1924
- August 23, 1926
- May 20, 1932
- August 24, 1934
- August 21, 1937
- May 21, 1940
- May 19, 1943
- August 23, 1945
- August 19, 1948
- May 21, 1951
- August 24, 1953
- August 21, 1956
- May 22, 1959
- November 22, 1961
- May 19, 1962
- August 23, 1964
- August 19, 1967
- May 20, 1970
- November 20, 1972
- August 21, 1975
- May 22, 1978
- February 18, 1981
- August 23, 1983
- August 19, 1986
- May 20, 1989
- November 21, 1991
- August 21, 1994
- May 22, 1997
- February 19, 2000
- August 22, 2002
- August 19, 2005
- May 19, 2008
- November 21, 2010
- August 20, 2013
- May 21, 2016
- May 18, 2019
- August 22, 2021
- August 19, 2024
- May 20, 2027
- August 23, 2029
- August 20, 2032
- May 22, 2035
- May 18, 2038
- August 22, 2040
- August 20, 2043
- May 19, 2046
- August 23, 2048
- August 21, 2051
- May 21, 2054
- May 18, 2057
- August 23, 2059
- August 19, 2062
- May 19, 2065
- November 20, 2067
- August 21, 2070
- May 21, 2073
- May 18, 2076
- August 23, 2078
- August 19, 2081
- May 19, 2084
- November 20, 2086
- August 21, 2089
- May 21, 2092
- May 19, 2095
- August 22, 2097
- August 19, 2100
Blue Moons in the 20th century
The 20th century began on January 1, 1901, and ended on December 31, 2000. There were a total of 79 blue moons that occurred including both monthly blue moons and seasonal blue moons.
There were 42 monthly blue moons the occurred including:
The 37 seasonal blue moons that occurred in the 20th century were: