Boise May 21 Weather Records

Daily averages and all-time records for weather in Boise, Idaho for the date of May 21.
May 21 All-Time Records
1911–2024
Highest temperature 91 °F 2023
Lowest temperature 27 °F 1918
Lowest daily high 52 °F 1960
Highest daily low 63 °F 2012
Most precipitation 0.80 inches 1998
Most snow none -
May 21 Average Weather
1991–2020 1
Average high 74.1 °F
Average low 48.6 °F
Chance precipitation 27.1%
Chance snow 0%
Boise May 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 91 62 0.03 0.0
2022 68 42 0.00 0.0
2021 55 42 0.03 0.0
2020 60 46 0.11 0.0
2019 60 45 0.67 0.0
2018 78 54 0.00 0.0
2017 75 49 0.00 0.0
2016 58 46 0.05 0.0
2015 73 52 0.03 0.0
2014 76 50 0.06 0.0
2013 85 52 0.00 0.0
2012 87 63 0.00 0.0
2011 74 48 0.00 0.0
2010 58 37 0.01 0.0
2009 78 42 0.00 0.0
2008 59 42 0.00 0.0
2007 57 43 0.01 0.0
2006 82 55 0.07 0.0
2005 68 41 0.00 0.0
2004 68 51 0.04 0.0
2003 76 48 0.00 0.0
2002 59 44 0.01 0.0
2001 74 37 0.00 0.0
2000 87 53 0.00 0.0
1999 76 48 0.00 0.0
1998 56 42 0.80 0.0
1997 81 44 0.00 0.0
1996 65 48 0.02 0.0
1995 77 46 0.00 0.0
1994 73 46 0.00 0.0
1993 74 55 0.00 0.0
1992 71 43 0.00 0.0
1991 75 42 0.00 0.0
1990 72 51 0.00 0.0
1989 76 43 0.00 0.0
1988 87 50 0.00 0.0
1987 67 36 0.00 0.0
1986 56 37 0.05 0.0
1985 73 47 0.00 0.0
1984 58 41 0.00 0.0
1983 72 44 0.00 0.0
1982 80 48 0.00 0.0
1981 62 48 0.06 0.0
1980 90 62 0.05 0.0
1979 82 49 0.00 0.0
1978 82 49 0.00 0.0
1977 74 48 0.00 0.0
1976 76 39 0.00 0.0
1975 66 50 0.00 0.0
1974 68 33 0.00 0.0
1973 70 34 0.00 0.0
1972 54 44 0.18 0.0
1971 68 45 0.00 0.0
1970 74 42 0.00 0.0
1969 73 42 0.00 0.0
1968 69 46 0.00 0.0
1967 90 52 0.00 0.0
1966 82 50 0.01 0.0
1965 69 51 0.10 0.0
1964 69 43 0.00 0.0
1963 85 55 0.00 0.0
1962 69 43 0.00 0.0
1961 71 51 0.08 0.0
1960 52 33 0.02 0.0
1959 65 38 0.00 0.0
1958 84 59 0.00 0.0
1957 62 44 0.28 0.0
1956 83 52 0.00 0.0
1955 69 49 0.00 0.0
1954 67 46 0.00 0.0
1953 55 40 0.16 0.0
1952 64 42 0.00 0.0
1951 75 42 0.00 0.0
1950 79 47 0.00 0.0
1949 69 44 0.00 0.0
1948 64 48 0.01 0.0
1947 76 42 0.00 0.0
1946 73 49 0.00 0.0
1945 62 38 0.00 0.0
1944 74 48 0.00 0.0
1943 70 45 0.00 0.0
1942 90 54 0.00 0.0
1941 82 42 0.00 0.0
1940 80 54 0.00 0.0
1939 66 50 0.00 0.0
1938 72 38 0.00 0.0
1937 83 42 0.00 0.0
1936 67 34 0.00 0.0
1935 84 48 0.00 0.0
1934 78 38 0.00 n/a
1933 71 42 0.00 0.0
1932 67 47 0.73 n/a
1931 70 33 n/a n/a
1930 80 40 0.10 n/a
1929 89 45 0.00 0.0
1928 89 51 0.00 n/a
1927 56 42 0.25 0.0
1926 81 42 0.00 0.0
1925 68 52 0.01 0.0
1924 86 50 0.00 0.0
1923 59 46 0.26 0.0
1922 71 44 0.18 0.0
1921 68 46 0.53 0.0
1920 72 49 0.00 0.0
1919 91 49 0.00 0.0
1918 64 27 0.00 0.0
1917 66 40 0.00 0.0
1916 65 37 0.00 0.0
1915 64 39 0.01 0.0
1914 86 53 0.00 0.0
1913 80 38 0.00 0.0
1912 59 46 0.06 0.0
1911 76 37 0.00 0.0
What's the all-time high for Boise on 5/21?
For the date of May 21, the highest temperature ever reached in Boise history is 91 °F which has happened 2 times, most recently in 2023.
Highest Temperatures in Boise on May 21
Rank Temperature Year
1 91 °F 1919
1 91 °F 2023
3 90 °F 1967
3 90 °F 1980
3 90 °F 1942
6 89 °F 1928
6 89 °F 1929
8 87 °F 1988
8 87 °F 2012
8 87 °F 2000
What's the all-time low for Boise on 5/21?
For the date of May 21, the lowest temperature ever reached in Boise history is 27 °F which happened in 1918.
Lowest Temperatures in Boise on May 21
Rank Temperature Year
1 27 °F 1918
2 33 °F 1931
2 33 °F 1974
2 33 °F 1960
5 34 °F 1936
5 34 °F 1973
7 36 °F 1987
8 37 °F 1986
8 37 °F 1916
8 37 °F 2010
8 37 °F 1911
8 37 °F 2001
Lowest High Temperatures in Boise on May 21
Rank Temperature Year
1 52 °F 1960
2 54 °F 1972
3 55 °F 1953
3 55 °F 2021
5 56 °F 1927
5 56 °F 1986
5 56 °F 1998
8 57 °F 2007
9 58 °F 2010
9 58 °F 1984
9 58 °F 2016
What's the most it has ever rained in Boise on 5/21?
For the date of May 21, the most precipitation ever recorded in Boise history is 0.80 inches which happened in 1998.
All-Time Most Precipitation in Boise on May 21
Rank Precipitation Year
1 0.80 inches 1998
2 0.73 inches 1932
3 0.67 inches 2019
4 0.53 inches 1921
5 0.28 inches 1957
6 0.26 inches 1923
7 0.25 inches 1927
8 0.18 inches 1972
8 0.18 inches 1922
10 0.16 inches 1953
Weather Station Details
Years Station Coordinates
1940–2024 location
1911–1939 Meridian 1 W location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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