Boston July 21 Weather Records

Daily averages and all-time records for weather in Boston, Massachusetts for the date of July 21.
July 21 All-Time Records
1893–2024
Highest temperature 102 °F 1977
Lowest temperature 56 °F 1950
Lowest daily high 64 °F 1903
Highest daily low 83 °F 2019
Most precipitation 2.33 inches 1938
Most snow none -
July 21 Average Weather
1991–2020 1
Average high 82.5 °F
Average low 66.6 °F
Chance precipitation 31.1%
Chance snow 0%
Boston July 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 74 65 1.98 0.0
2022 94 71 0.00 0.0
2021 84 68 0.00 0.0
2020 90 74 0.00 0.0
2019 98 83 0.00 0.0
2018 74 63 0.00 0.0
2017 91 73 0.00 0.0
2016 91 67 0.00 0.0
2015 81 70 0.00 0.0
2014 73 61 0.00 0.0
2013 79 68 0.01 0.0
2012 74 61 0.00 0.0
2011 97 73 0.00 0.0
2010 88 68 0.05 0.0
2009 67 63 0.52 0.0
2008 84 68 0.14 0.0
2007 75 63 0.00 0.0
2006 88 68 1.29 0.0
2005 83 71 0.00 0.0
2004 81 69 0.00 0.0
2003 84 66 0.00 0.0
2002 86 62 0.00 0.0
2001 82 60 0.00 0.0
2000 81 59 0.03 0.0
1999 76 61 0.00 0.0
1998 91 72 0.00 0.0
1997 76 62 0.01 0.0
1996 81 65 0.00 0.0
1995 88 71 0.01 0.0
1994 97 75 0.00 0.0
1993 90 64 0.00 0.0
1992 85 70 0.00 0.0
1991 99 81 0.00 0.0
1990 85 65 0.00 0.0
1989 68 62 0.15 0.0
1988 67 62 0.21 0.0
1987 77 63 0.00 0.0
1986 85 71 0.00 0.0
1985 83 70 0.00 0.0
1984 83 66 0.36 0.0
1983 95 69 0.25 0.0
1982 75 66 0.06 0.0
1981 91 74 0.31 0.0
1980 99 76 0.01 0.0
1979 87 69 0.00 0.0
1978 95 72 0.00 0.0
1977 102 76 0.04 0.0
1976 76 70 0.31 0.0
1975 87 72 0.28 0.0
1974 80 59 0.00 0.0
1973 74 64 0.47 0.0
1972 87 66 0.10 0.0
1971 78 63 0.00 0.0
1970 84 65 0.00 0.0
1969 68 62 0.04 0.0
1968 80 64 0.00 0.0
1967 75 65 0.00 0.0
1966 78 59 0.00 0.0
1965 77 59 0.00 0.0
1964 85 62 0.00 0.0
1963 74 63 0.00 0.0
1962 83 68 0.00 0.0
1961 91 66 0.00 0.0
1960 82 62 0.00 0.0
1959 76 66 0.91 0.0
1958 76 59 0.00 0.0
1957 82 70 0.00 0.0
1956 69 60 0.76 0.0
1955 96 68 0.00 0.0
1954 75 65 0.33 0.0
1953 77 67 0.00 0.0
1952 74 67 0.17 0.0
1951 81 60 0.00 0.0
1950 76 56 0.00 0.0
1949 93 71 0.02 0.0
1948 88 69 0.59 0.0
1947 75 59 0.50 0.0
1946 66 57 0.11 0.0
1945 80 66 0.00 0.0
1944 80 64 0.03 0.0
1943 90 68 0.00 0.0
1942 79 63 0.00 0.0
1941 85 61 0.00 0.0
1940 77 65 0.23 0.0
1939 71 59 0.00 0.0
1938 75 67 2.33 0.0
1937 75 62 0.00 0.0
1936 68 58 0.00 0.0
1935 73 62 0.01 0.0
1934 83 71 0.00 0.0
1933 81 64 0.01 0.0
1932 80 65 0.00 0.0
1931 87 73 0.00 0.0
1930 82 68 0.32 0.0
1929 74 57 0.00 0.0
1928 78 58 0.00 0.0
1927 74 59 0.00 0.0
1926 98 70 0.00 0.0
1925 78 67 0.00 0.0
1924 81 65 0.00 0.0
1923 92 72 0.34 0.0
1922 76 65 0.00 0.0
1921 69 61 1.10 0.0
1920 85 65 0.00 0.0
1919 86 71 0.00 0.0
1918 87 68 0.00 0.0
1917 83 70 0.00 0.0
1916 78 63 0.50 0.0
1915 70 62 0.06 0.0
1914 87 63 0.00 0.0
1913 77 64 0.00 0.0
1912 70 61 1.03 0.0
1911 79 65 0.00 0.0
1910 85 64 0.00 0.0
1909 69 61 0.00 0.0
1908 71 60 0.00 0.0
1907 81 65 0.00 0.0
1906 80 68 0.26 0.0
1905 75 63 0.00 0.0
1904 84 66 0.00 0.0
1903 64 59 0.24 0.0
1902 64 57 0.76 0.0
1901 90 66 0.00 0.0
1900 79 63 0.00 0.0
1899 88 61 0.00 0.0
1898 91 68 0.14 0.0
1897 79 70 0.00 0.0
1896 87 72 0.15 0.0
1895 82 67 0.00 0.0
1894 87 65 0.73 0.0
1893 88 62 0.00 0.0
What's the all-time high for Boston on 7/21?
For the date of Jul 21, the highest temperature ever reached in Boston history is 102 °F which happened in 1977.
Highest Temperatures in Boston on July 21
Rank Temperature Year
1 102 °F 1977
2 99 °F 1980
2 99 °F 1991
4 98 °F 1926
4 98 °F 2019
6 97 °F 1994
6 97 °F 2011
8 96 °F 1955
9 95 °F 1983
9 95 °F 1978
What's the all-time low for Boston on 7/21?
For the date of Jul 21, the lowest temperature ever reached in Boston history is 56 °F which happened in 1950.
Lowest Temperatures in Boston on July 21
Rank Temperature Year
1 56 °F 1950
2 57 °F 1946
2 57 °F 1929
2 57 °F 1902
5 58 °F 1928
5 58 °F 1936
7 59 °F 1974
7 59 °F 1966
7 59 °F 1965
7 59 °F 1958
7 59 °F 1947
7 59 °F 1927
7 59 °F 1939
7 59 °F 2000
7 59 °F 1903
Lowest High Temperatures in Boston on July 21
Rank Temperature Year
1 64 °F 1903
1 64 °F 1902
3 66 °F 1946
4 67 °F 1988
4 67 °F 2009
6 68 °F 1969
6 68 °F 1989
6 68 °F 1936
9 69 °F 1921
9 69 °F 1909
9 69 °F 1956
What's the most it has ever rained in Boston on 7/21?
For the date of Jul 21, the most precipitation ever recorded in Boston history is 2.33 inches which happened in 1938.
All-Time Most Precipitation in Boston on July 21
Rank Precipitation Year
1 2.33 inches 1938
2 1.98 inches 2023
3 1.29 inches 2006
4 1.10 inches 1921
5 1.03 inches 1912
6 0.91 inches 1959
7 0.76 inches 1956
7 0.76 inches 1902
9 0.73 inches 1894
10 0.59 inches 1948
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.
© H Brothers Inc, 2021–2024
Contact us | Privacy policy