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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
1940–2022
Highest temperature 60 °F 1964
Lowest temperature -23 °F 1990
Lowest daily high -3 °F 1990
Highest daily low 46 °F 1972
Most precipitation 0.8 inches 2014
Most snow 3.1 inches 1988
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)
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 0.00 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
All-Time Highest Temperatures in Boise on December 21
Rank Temperature Year
1 60 °F 1964
2 59 °F 1969
3 58 °F 2020
4 55 °F 1955
5 54 °F 1940
5 54 °F 1957
7 53 °F 1958
7 53 °F 1974
9 52 °F 1982
10 51 °F 1972
All-Time Lowest Temperatures in Boise on December 21
Rank Temperature Year
1 -23 °F 1990
2 -8 °F 1983
3 -3 °F 1985
4 -2 °F 1998
5 -1 °F 1984
6 6 °F 1968
7 8 °F 1976
7 8 °F 1967
9 11 °F 1965
9 11 °F 1948
Lowest High Temperatures in Boise on December 21
Rank Temperature Year
1 -3 °F 1990
2 13 °F 1998
2 13 °F 1985
4 14 °F 1983
5 16 °F 1984
6 21 °F 1975
7 25 °F 1968
8 26 °F 1965
9 27 °F 1986
10 28 °F 2006
10 28 °F 1967
10 28 °F 1948
All-Time Most Precipitation in Boise on December 21
Rank Precipitation Year
1 0.8 inches 2014
2 0.3 inches 1981
3 0.3 inches 2005
4 0.2 inches 1988
5 0.2 inches 1979
6 0.1 inches 1969
6 0.1 inches 1945
8 0.1 inches 1951
9 0.1 inches 1973
10 0.1 inches 1964
10 0.1 inches 2015
10 0.1 inches 2002
10 0.1 inches 2008
All-Time Most Snow in Boise on December 21
Rank Precipitation Year
1 3.1 inches 1988
2 2.5 inches 2008
3 2.2 inches 1945
4 1.4 inches 1951
5 1.2 inches 1956
6 0.9 inches 2006
7 0.4 inches 1967
8 0.3 inches 1984
8 0.3 inches 1996
10 0.2 inches 1978
10 0.2 inches 2013
Weather Station Details
Years Station Coordinates
1940–2022 location