Boise December 21 Weather Records

Daily averages and all-time records for weather in Boise, Idaho for the date of December 21.
December 21 All-Time Records
1911–2024
Highest temperature 60 °F 1964
Lowest temperature -23 °F 1990
Lowest daily high -3 °F 1990
Highest daily low 46 °F 1972
Most precipitation 0.76 inches 2014
Most snow 7.5 inches 1924
December 21 Average Weather
1991–2020 1
Average high 38.0 °F
Average low 24.5 °F
Chance precipitation 38.6%
Chance snow 17.8%
Boise December 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 37 32 0.01 0.0
2022 38 17 0.01 0.0
2021 42 25 0.00 0.0
2020 58 43 0.00 0.0
2019 50 40 0.00 0.0
2018 41 29 0.01 0.0
2017 35 22 0.00 0.0
2016 30 11 0.00 0.0
2015 45 34 0.11 0.0
2014 47 40 0.76 0.0
2013 30 21 0.02 0.2
2012 46 39 0.00 0.0
2011 42 18 0.00 0.0
2010 42 28 0.00 0.0
2009 48 34 0.01 0.0
2008 36 24 0.11 2.5
2007 35 22 0.00 0.0
2006 28 19 0.09 0.9
2005 49 32 0.28 0.0
2004 36 20 0.00 0.0
2003 45 30 0.02 0.0
2002 42 33 0.11 0.0
2001 36 25 0.00 0.0
2000 44 29 0.00 0.0
1999 47 25 0.00 0.0
1998 13 -2 0.00 0.0
1997 37 22 0.00 0.0
1996 35 18 0.02 0.3
1995 36 24 0.00 0.0
1994 37 26 0.00 0.0
1993 31 26 0.00 0.0
1992 36 31 0.00 0.0
1991 34 17 0.00 0.0
1990 -3 -23 0.01 0.1
1989 46 17 0.00 0.0
1988 39 29 0.23 3.1
1987 42 31 0.00 0.0
1986 27 21 0.00 0.0
1985 13 -3 0.00 0.0
1984 16 -1 0.04 0.3
1983 14 -8 0.01 0.0
1982 52 41 0.03 0.0
1981 45 32 0.33 0.0
1980 47 27 0.09 0.0
1979 46 36 0.17 0.0
1978 41 29 0.02 0.2
1977 35 23 0.00 0.0
1976 35 8 0.00 0.0
1975 21 17 0.00 0.0
1974 53 32 0.00 0.0
1973 48 38 0.13 0.0
1972 51 46 0.00 0.0
1971 44 37 0.00 0.0
1970 35 30 0.00 0.0
1969 59 39 0.15 0.0
1968 25 6 0.00 0.0
1967 28 8 0.02 0.4
1966 36 22 0.00 0.0
1965 26 11 0.00 0.0
1964 60 40 0.11 0.0
1963 31 20 0.00 0.0
1962 35 29 0.00 0.0
1961 48 32 0.00 0.0
1960 39 22 0.00 0.0
1959 36 16 0.00 0.0
1958 53 36 0.10 0.0
1957 54 34 0.02 0.0
1956 34 18 0.08 1.2
1955 55 45 0.08 0.0
1954 31 12 0.00 0.0
1953 43 27 0.00 0.0
1952 38 27 0.00 0.0
1951 37 23 0.14 1.4
1950 40 27 0.00 0.0
1949 33 21 0.00 0.0
1948 28 11 0.00 0.0
1947 46 29 0.06 0.0
1946 46 27 0.00 0.0
1945 39 19 0.15 2.2
1944 41 30 0.02 0.0
1943 36 32 0.00 0.0
1942 41 23 0.00 0.0
1941 41 28 0.00 0.0
1940 54 37 0.03 0.0
1939 43 28 0.00 0.0
1938 38 29 0.07 0.0
1937 35 24 0.00 0.0
1936 57 32 0.00 0.0
1935 21 17 0.00 0.0
1934 48 35 0.00 n/a
1933 n/a n/a 0.00 0.0
1932 40 25 n/a 0.0
1931 44 29 0.24 0.0
1930 40 6 0.00 0.0
1929 45 12 0.00 0.0
1928 23 -5 0.00 0.0
1927 29 11 0.00 0.0
1926 38 23 0.36 0.3
1925 37 32 0.30 2.0
1924 16 10 0.50 7.5
1923 36 15 0.00 0.0
1922 32 6 0.00 0.0
1921 40 29 0.00 0.0
1920 34 18 0.15 1.5
1919 40 26 0.00 0.0
1918 31 15 0.00 0.0
1917 44 33 0.00 0.0
1916 41 27 0.19 2.0
1915 42 31 0.10 0.0
1914 28 0 0.00 0.0
1913 25 -1 0.00 0.0
1912 31 4 0.01 0.1
1911 30 6 0.00 0.0
What's the all-time high for Boise on 12/21?
For the date of Dec 21, the highest temperature ever reached in Boise history is 60 °F which happened in 1964.
Highest Temperatures in Boise on December 21
Rank Temperature Year
1 60 °F 1964
2 59 °F 1969
3 58 °F 2020
4 57 °F 1936
5 55 °F 1955
6 54 °F 1957
6 54 °F 1940
8 53 °F 1958
8 53 °F 1974
10 52 °F 1982
What's the all-time low for Boise on 12/21?
For the date of Dec 21, the lowest temperature ever reached in Boise history is -23 °F which happened in 1990.
Lowest Temperatures in Boise on December 21
Rank Temperature Year
1 -23 °F 1990
2 -8 °F 1983
3 -5 °F 1928
4 -3 °F 1985
5 -2 °F 1998
6 -1 °F 1913
6 -1 °F 1984
8 0 °F 1914
9 4 °F 1912
10 6 °F 1930
10 6 °F 1911
10 6 °F 1968
10 6 °F 1922
Lowest High Temperatures in Boise on December 21
Rank Temperature Year
1 -3 °F 1990
2 13 °F 1985
2 13 °F 1998
4 14 °F 1983
5 16 °F 1984
5 16 °F 1924
7 21 °F 1975
7 21 °F 1935
9 23 °F 1928
10 25 °F 1913
10 25 °F 1968
What's the most it has ever rained in Boise on 12/21?
For the date of Dec 21, the most precipitation ever recorded in Boise history is 0.76 inches which happened in 2014.
All-Time Most Precipitation in Boise on December 21
Rank Precipitation Year
1 0.76 inches 2014
2 0.50 inches 1924
3 0.36 inches 1926
4 0.33 inches 1981
5 0.30 inches 1925
6 0.28 inches 2005
7 0.24 inches 1931
8 0.23 inches 1988
9 0.19 inches 1916
10 0.17 inches 1979
All-Time Most Snow in Boise on December 21
Rank Precipitation Year
1 7.5 inches 1924
2 3.1 inches 1988
3 2.5 inches 2008
4 2.2 inches 1945
5 2.0 inches 1916
5 2.0 inches 1925
7 1.5 inches 1920
8 1.4 inches 1951
9 1.2 inches 1956
10 0.9 inches 2006
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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