Boston May 21 Weather Records

Daily averages and all-time records for weather in Boston, Massachusetts for the date of May 21.
May 21 All-Time Records
1893–2024
Highest temperature 93 °F 1921
Lowest temperature 41 °F 1907
Lowest daily high 45 °F 1990
Highest daily low 66 °F 1996
Most precipitation 1.85 inches 1954
Most snow none -
May 21 Average Weather
1991–2020 1
Average high 68.2 °F
Average low 51.6 °F
Chance precipitation 37.5%
Chance snow 0%
Boston May 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 76 61 0.11 0.0
2022 71 54 0.02 0.0
2021 82 56 0.00 0.0
2020 77 45 0.00 0.0
2019 72 58 0.00 0.0
2018 80 57 0.00 0.0
2017 61 48 0.00 0.0
2016 76 53 0.00 0.0
2015 67 45 0.00 0.0
2014 65 52 0.00 0.0
2013 66 52 0.01 0.0
2012 59 54 0.02 0.0
2011 62 49 0.00 0.0
2010 69 54 0.00 0.0
2009 92 59 0.00 0.0
2008 71 50 0.00 0.0
2007 66 50 0.00 0.0
2006 68 45 0.11 0.0
2005 54 46 0.23 0.0
2004 77 54 0.00 0.0
2003 70 55 0.09 0.0
2002 62 43 0.00 0.0
2001 58 50 0.00 0.0
2000 53 49 0.01 0.0
1999 66 50 0.00 0.0
1998 82 55 0.00 0.0
1997 62 47 0.06 0.0
1996 91 66 0.09 0.0
1995 80 53 0.00 0.0
1994 73 44 0.00 0.0
1993 70 50 0.00 0.0
1992 82 55 0.00 0.0
1991 84 53 0.00 0.0
1990 45 42 0.21 0.0
1989 80 58 0.05 0.0
1988 59 49 0.11 0.0
1987 69 45 0.00 0.0
1986 77 57 0.24 0.0
1985 77 61 0.37 0.0
1984 70 54 0.08 0.0
1983 79 60 0.03 0.0
1982 66 55 0.00 0.0
1981 68 50 0.00 0.0
1980 54 46 0.21 0.0
1979 67 53 0.01 0.0
1978 77 60 0.06 0.0
1977 77 59 0.00 0.0
1976 58 48 0.51 0.0
1975 89 55 0.00 0.0
1974 59 48 0.00 0.0
1973 65 52 0.13 0.0
1972 75 50 0.00 0.0
1971 60 48 0.00 0.0
1970 61 52 0.00 0.0
1969 66 51 0.00 0.0
1968 67 49 0.02 0.0
1967 64 47 0.00 0.0
1966 78 55 0.00 0.0
1965 60 49 0.00 0.0
1964 64 45 0.00 0.0
1963 70 52 0.00 0.0
1962 81 48 0.04 0.0
1961 73 50 0.00 0.0
1960 63 52 0.00 0.0
1959 74 62 0.00 0.0
1958 71 55 0.00 0.0
1957 63 43 0.04 0.0
1956 71 48 0.00 0.0
1955 83 56 0.00 0.0
1954 52 48 1.85 0.0
1953 60 48 0.00 0.0
1952 65 50 0.20 0.0
1951 79 57 0.02 0.0
1950 77 45 0.00 0.0
1949 60 45 0.00 0.0
1948 50 44 0.05 0.0
1947 66 48 0.01 0.0
1946 72 55 0.45 0.0
1945 65 51 0.00 0.0
1944 80 50 0.00 0.0
1943 50 46 0.94 0.0
1942 66 54 0.30 0.0
1941 85 53 0.00 0.0
1940 57 48 0.10 0.0
1939 60 51 0.01 0.0
1938 74 55 0.00 0.0
1937 75 50 0.00 0.0
1936 65 43 0.00 0.0
1935 67 50 0.00 0.0
1934 67 55 0.00 0.0
1933 60 50 0.11 0.0
1932 74 55 0.00 0.0
1931 74 62 0.69 0.0
1930 70 46 0.00 0.0
1929 48 43 0.47 0.0
1928 55 47 0.00 0.0
1927 66 48 0.00 0.0
1926 70 47 0.00 0.0
1925 83 52 0.00 0.0
1924 52 43 0.00 0.0
1923 57 49 0.27 0.0
1922 80 58 0.00 0.0
1921 93 61 0.00 0.0
1920 62 55 0.27 0.0
1919 56 51 0.00 0.0
1918 75 65 0.00 0.0
1917 69 50 0.00 0.0
1916 67 50 0.00 0.0
1915 59 51 0.10 0.0
1914 67 52 0.00 0.0
1913 62 51 0.00 0.0
1912 55 44 0.31 0.0
1911 87 65 0.00 0.0
1910 62 51 0.04 0.0
1909 53 47 0.00 0.0
1908 62 53 0.29 0.0
1907 56 41 0.00 0.0
1906 56 43 0.00 0.0
1905 64 43 0.00 0.0
1904 78 54 0.00 0.0
1903 84 66 0.00 0.0
1902 72 47 0.00 0.0
1901 60 45 0.00 0.0
1900 66 46 0.11 0.0
1899 52 45 0.11 0.0
1898 62 54 0.00 0.0
1897 75 53 0.14 0.0
1896 56 48 0.05 0.0
1895 57 50 0.01 0.0
1894 48 43 0.00 0.0
1893 85 57 0.00 0.0
What's the all-time high for Boston on 5/21?
For the date of May 21, the highest temperature ever reached in Boston history is 93 °F which happened in 1921.
Highest Temperatures in Boston on May 21
Rank Temperature Year
1 93 °F 1921
2 92 °F 2009
3 91 °F 1996
4 89 °F 1975
5 87 °F 1911
6 85 °F 1941
6 85 °F 1893
8 84 °F 1903
8 84 °F 1991
10 83 °F 1925
10 83 °F 1955
What's the all-time low for Boston on 5/21?
For the date of May 21, the lowest temperature ever reached in Boston history is 41 °F which happened in 1907.
Lowest Temperatures in Boston on May 21
Rank Temperature Year
1 41 °F 1907
2 42 °F 1990
3 43 °F 1894
3 43 °F 1929
3 43 °F 1957
3 43 °F 1906
3 43 °F 2002
3 43 °F 1924
3 43 °F 1905
3 43 °F 1936
Lowest High Temperatures in Boston on May 21
Rank Temperature Year
1 45 °F 1990
2 48 °F 1894
2 48 °F 1929
4 50 °F 1943
4 50 °F 1948
6 52 °F 1954
6 52 °F 1924
6 52 °F 1899
9 53 °F 1909
9 53 °F 2000
What's the most it has ever rained in Boston on 5/21?
For the date of May 21, the most precipitation ever recorded in Boston history is 1.85 inches which happened in 1954.
All-Time Most Precipitation in Boston on May 21
Rank Precipitation Year
1 1.85 inches 1954
2 0.94 inches 1943
3 0.69 inches 1931
4 0.51 inches 1976
5 0.47 inches 1929
6 0.45 inches 1946
7 0.37 inches 1985
8 0.31 inches 1912
9 0.30 inches 1942
10 0.29 inches 1908
Weather Station Details
Years Station Coordinates
1936–2024 Boston Logan International Airport location
1893–1935 Boston City location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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