Casper December 21 Weather Records

Daily averages and all-time records for weather in Casper, Wyoming for the date of December 21.
December 21 All-Time Records
1900–2024
Highest temperature 53 °F 2023
Lowest temperature -41 °F 1990
Lowest daily high -18 °F 1990
Highest daily low 42 °F 1933
Most precipitation 0.35 inches 2017
Most snow 6.0 inches 2017
December 21 Average Weather
1991–2020 1
Average high 34.4 °F
Average low 14.6 °F
Chance precipitation 24.8%
Chance snow 24.0%
Casper December 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 53 29 0.00 0.0
2022 29 -35 0.16 2.1
2021 50 30 0.00 0.0
2020 49 35 0.00 0.0
2019 44 32 0.00 0.0
2018 50 21 0.00 0.0
2017 15 9 0.35 6.0
2016 38 15 0.00 0.0
2015 36 20 0.00 0.0
2014 41 30 0.01 0.2
2013 27 10 0.00 0.0
2012 43 25 0.00 0.0
2011 30 22 0.20 3.8
2010 31 21 0.00 0.1
2009 46 30 0.00 0.0
2008 19 -16 0.00 0.0
2007 35 3 0.01 0.2
2006 36 13 0.00 0.0
2005 47 35 0.00 0.0
2004 28 14 0.00 0.0
2003 38 26 0.21 2.9
2002 27 11 0.00 0.0
2001 44 18 0.00 0.0
2000 32 -10 0.00 0.0
1999 28 4 0.02 0.5
1998 1 -24 0.00 0.0
1997 30 8 0.00 0.0
1996 31 4 0.04 n/a
1995 26 14 0.07 1.7
1994 48 32 0.00 0.0
1993 30 3 0.06 1.2
1992 33 19 0.00 0.0
1991 40 23 0.00 0.0
1990 -18 -41 0.00 0.1
1989 n/a -27 0.01 0.3
1988 44 29 0.00 0.0
1987 42 16 0.00 0.0
1986 38 16 0.00 0.0
1985 40 30 0.00 0.0
1984 32 18 0.00 0.0
1983 -13 -37 0.00 0.0
1982 43 34 0.00 0.0
1981 40 17 0.00 0.0
1980 50 25 0.00 0.0
1979 45 23 0.00 0.0
1978 28 6 0.00 0.0
1977 33 17 0.00 0.0
1976 39 15 0.00 0.0
1975 38 19 0.00 0.0
1974 40 21 0.00 0.0
1973 42 30 0.00 0.0
1972 44 28 0.00 0.0
1971 41 26 0.00 0.0
1970 29 13 0.00 0.0
1969 53 30 0.00 0.0
1968 6 -15 0.01 0.6
1967 11 -8 0.01 0.3
1966 45 20 0.07 1.1
1965 42 26 0.00 0.0
1964 45 33 0.00 0.0
1963 28 13 0.01 0.2
1962 39 16 0.00 0.0
1961 42 15 0.02 0.0
1960 33 13 0.03 0.3
1959 44 18 0.00 0.0
1958 52 33 0.00 0.0
1957 47 35 0.00 0.0
1956 40 26 0.02 0.6
1955 48 35 0.00 0.0
1954 44 28 0.00 0.0
1953 29 12 0.00 0.1
1952 38 23 0.00 0.0
1951 29 10 0.00 0.0
1950 48 31 0.00 0.0
1949 21 -2 0.00 0.0
1948 25 -2 0.00 0.0
1947 n/a n/a n/a n/a
1946 n/a n/a n/a n/a
1945 n/a n/a n/a n/a
1944 n/a n/a n/a n/a
1943 n/a n/a n/a n/a
1942 n/a n/a n/a n/a
1941 n/a n/a n/a n/a
1940 n/a n/a n/a n/a
1939 n/a n/a n/a n/a
1938 42 16 0.00 0.0
1937 34 24 0.00 0.0
1936 45 36 0.00 0.0
1935 40 n/a 0.00 n/a
1934 42 25 0.00 0.0
1933 48 42 0.00 0.0
1932 39 n/a 0.00 0.0
1931 53 41 0.00 0.0
1930 24 8 0.12 1.5
1929 25 9 n/a n/a
1928 39 12 n/a n/a
1927 n/a n/a n/a n/a
1926 38 8 n/a n/a
1925 25 12 0.03 0.0
1924 2 -6 0.12 2.0
1923 33 23 0.09 1.0
1922 50 36 n/a n/a
1921 18 5 0.00 n/a
1920 16 2 0.18 2.0
1919 n/a n/a n/a n/a
1918 32 16 0.20 3.0
1917 41 23 0.00 0.0
1916 n/a n/a n/a n/a
1915 39 30 0.00 0.0
1914 28 1 0.00 0.0
1913 20 -11 0.00 0.0
1912 n/a n/a n/a n/a
1911 40 10 0.00 0.0
1910 30 15 0.20 2.0
1909 8 -6 0.00 0.0
1908 n/a n/a n/a n/a
1907 n/a n/a n/a n/a
1906 n/a n/a n/a n/a
1905 n/a n/a n/a n/a
1904 n/a n/a n/a n/a
1903 n/a n/a n/a n/a
1902 n/a n/a n/a n/a
1901 n/a n/a n/a n/a
1900 51 34 0.00 0.0
What's the all-time high for Casper on 12/21?
For the date of Dec 21, the highest temperature ever reached in Casper history is 53 °F which has happened 3 times, most recently in 2023.
Highest Temperatures in Casper on December 21
Rank Temperature Year
1 53 °F 1931
1 53 °F 1969
1 53 °F 2023
4 52 °F 1958
5 51 °F 1900
6 50 °F 2018
6 50 °F 1922
6 50 °F 2021
6 50 °F 1980
10 49 °F 2020
What's the all-time low for Casper on 12/21?
For the date of Dec 21, the lowest temperature ever reached in Casper history is -41 °F which happened in 1990.
Lowest Temperatures in Casper on December 21
Rank Temperature Year
1 -41 °F 1990
2 -37 °F 1983
3 -35 °F 2022
4 -27 °F 1989
5 -24 °F 1998
6 -16 °F 2008
7 -15 °F 1968
8 -11 °F 1913
9 -10 °F 2000
10 -8 °F 1967
Lowest High Temperatures in Casper on December 21
Rank Temperature Year
1 -18 °F 1990
2 -13 °F 1983
3 1 °F 1998
4 2 °F 1924
5 6 °F 1968
6 8 °F 1909
7 11 °F 1967
8 15 °F 2017
9 16 °F 1920
10 18 °F 1921
What's the most it has ever rained in Casper on 12/21?
For the date of Dec 21, the most precipitation ever recorded in Casper history is 0.35 inches which happened in 2017.
All-Time Most Precipitation in Casper on December 21
Rank Precipitation Year
1 0.35 inches 2017
2 0.21 inches 2003
3 0.20 inches 1910
3 0.20 inches 1918
3 0.20 inches 2011
6 0.18 inches 1920
7 0.16 inches 2022
8 0.12 inches 1924
8 0.12 inches 1930
10 0.09 inches 1923
All-Time Most Snow in Casper on December 21
Rank Precipitation Year
1 6.0 inches 2017
2 3.8 inches 2011
3 3.0 inches 1918
4 2.9 inches 2003
5 2.1 inches 2022
6 2.0 inches 1924
6 2.0 inches 1920
6 2.0 inches 1910
9 1.7 inches 1995
10 1.5 inches 1930
Weather Station Details
Years Station Coordinates
1949–2024 Casper-Natrona County International Airport location
1900–1948 Casper 2 E location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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