Boise April 21 Weather Records

Daily averages and all-time records for weather in Boise, Idaho for the date of April 21.
April 21 All-Time Records
1911–2024
Highest temperature 89 °F 1934
Lowest temperature 22 °F 1920
Lowest daily high 48 °F 1985
Highest daily low 55 °F 1994
Most precipitation 0.58 inches 2011
Most snow 0.3 inches 1968
April 21 Average Weather
1991–2020 1
Average high 64.1 °F
Average low 40.2 °F
Chance precipitation 29.0%
Chance snow 0.2%
Boise April 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2024 62 46 0.00 0.0
2023 53 39 0.08 0.0
2022 57 43 0.10 0.0
2021 66 38 0.00 0.0
2020 73 42 0.00 0.0
2019 67 48 0.00 0.0
2018 70 44 0.00 0.0
2017 59 34 0.00 0.0
2016 87 52 0.00 0.0
2015 76 45 0.00 0.0
2014 75 42 0.00 0.0
2013 64 38 0.00 0.0
2012 82 50 0.00 0.0
2011 50 35 0.58 0.0
2010 60 47 0.03 0.0
2009 86 51 0.00 0.0
2008 49 26 0.00 0.0
2007 63 38 0.00 0.0
2006 71 47 0.00 0.0
2005 61 43 0.41 0.0
2004 52 39 0.15 0.0
2003 67 51 0.02 0.0
2002 64 33 0.00 0.0
2001 55 40 0.01 0.0
2000 67 44 0.00 0.0
1999 54 34 0.00 0.0
1998 77 47 0.00 0.0
1997 59 38 0.00 0.0
1996 54 30 0.00 0.0
1995 60 36 0.00 0.0
1994 79 55 0.00 0.0
1993 70 37 0.00 0.0
1992 61 46 0.13 0.0
1991 70 47 0.00 0.0
1990 64 47 0.18 0.0
1989 76 49 0.00 0.0
1988 60 43 0.02 0.0
1987 78 42 0.00 0.0
1986 83 49 0.00 0.0
1985 48 32 0.39 0.0
1984 59 38 0.00 0.0
1983 63 44 0.00 0.0
1982 63 30 0.00 0.0
1981 59 45 0.18 0.0
1980 68 51 0.00 0.0
1979 70 35 0.00 0.0
1978 49 34 0.01 0.0
1977 76 48 0.00 0.0
1976 56 30 0.00 0.0
1975 65 39 0.00 0.0
1974 63 31 0.00 0.0
1973 62 37 0.00 0.0
1972 60 41 0.08 0.0
1971 59 43 0.00 0.0
1970 52 24 0.00 0.0
1969 79 43 0.00 0.0
1968 51 23 0.03 0.3
1967 52 29 0.00 0.0
1966 57 35 0.00 0.0
1965 65 49 0.26 0.0
1964 58 34 0.00 0.0
1963 52 29 0.00 0.0
1962 63 32 0.00 0.0
1961 63 35 0.00 0.0
1960 54 35 0.00 0.0
1959 71 40 0.00 0.0
1958 60 40 0.37 0.0
1957 57 41 0.12 0.0
1956 81 47 0.00 0.0
1955 60 42 0.34 0.0
1954 63 34 0.00 0.0
1953 72 44 0.00 0.0
1952 65 35 0.00 0.0
1951 53 24 0.00 0.0
1950 71 44 0.00 0.0
1949 66 47 0.01 0.0
1948 78 46 0.15 0.0
1947 60 31 0.00 0.0
1946 59 39 0.00 0.0
1945 63 40 0.00 0.0
1944 62 32 0.08 0.0
1943 61 43 0.06 0.0
1942 84 53 0.00 0.0
1941 67 37 0.00 0.0
1940 62 32 0.00 0.0
1939 84 36 0.00 0.0
1938 71 40 0.00 0.0
1937 63 41 0.00 0.0
1936 87 42 0.00 0.0
1935 60 38 0.24 n/a
1934 89 44 0.00 0.0
1933 61 45 0.00 0.0
1932 53 36 0.00 n/a
1931 65 31 0.00 n/a
1930 85 44 0.00 n/a
1929 64 32 0.00 0.0
1928 59 25 0.00 0.0
1927 65 26 0.00 0.0
1926 72 38 0.00 0.0
1925 62 38 0.03 0.0
1924 75 32 0.00 0.0
1923 49 32 0.01 0.0
1922 72 34 0.00 0.0
1921 62 38 0.00 0.0
1920 50 22 0.00 0.0
1919 72 31 0.00 0.0
1918 73 34 0.00 0.0
1917 61 44 0.16 0.0
1916 68 48 0.00 0.0
1915 64 38 0.04 0.0
1914 55 35 0.01 0.0
1913 73 44 0.00 0.0
1912 51 36 0.35 0.0
1911 60 28 0.00 0.0
What's the all-time high for Boise on 4/21?
For the date of Apr 21, the highest temperature ever reached in Boise history is 89 °F which happened in 1934.
Highest Temperatures in Boise on April 21
Rank Temperature Year
1 89 °F 1934
2 87 °F 2016
2 87 °F 1936
4 86 °F 2009
5 85 °F 1930
6 84 °F 1939
6 84 °F 1942
8 83 °F 1986
9 82 °F 2012
10 81 °F 1956
What's the all-time low for Boise on 4/21?
For the date of Apr 21, the lowest temperature ever reached in Boise history is 22 °F which happened in 1920.
Lowest Temperatures in Boise on April 21
Rank Temperature Year
1 22 °F 1920
2 23 °F 1968
3 24 °F 1970
3 24 °F 1951
5 25 °F 1928
6 26 °F 2008
6 26 °F 1927
8 28 °F 1911
9 29 °F 1963
9 29 °F 1967
Lowest High Temperatures in Boise on April 21
Rank Temperature Year
1 48 °F 1985
2 49 °F 1923
2 49 °F 2008
2 49 °F 1978
5 50 °F 1920
5 50 °F 2011
7 51 °F 1912
7 51 °F 1968
9 52 °F 1963
9 52 °F 1970
9 52 °F 2004
9 52 °F 1967
What's the most it has ever rained in Boise on 4/21?
For the date of Apr 21, the most precipitation ever recorded in Boise history is 0.58 inches which happened in 2011.
All-Time Most Precipitation in Boise on April 21
Rank Precipitation Year
1 0.58 inches 2011
2 0.41 inches 2005
3 0.39 inches 1985
4 0.37 inches 1958
5 0.35 inches 1912
6 0.34 inches 1955
7 0.26 inches 1965
8 0.24 inches 1935
9 0.18 inches 1990
9 0.18 inches 1981
All-Time Most Snow in Boise on April 21
Rank Precipitation Year
1 0.3 inches 1968
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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