Casper April 21 Weather Records

Daily averages and all-time records for weather in Casper, Wyoming for the date of April 21.
April 21 All-Time Records
1900–2024
Highest temperature 83 °F 1989
Lowest temperature 14 °F 1973
Lowest daily high 29 °F 1951
Highest daily low 45 °F 1990
Most precipitation 0.85 inches 1912
Most snow 3.0 inches 1996
April 21 Average Weather
1991–2020 1
Average high 58.1 °F
Average low 29.8 °F
Chance precipitation 35.1%
Chance snow 18.6%
Casper April 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2024 67 18 0.00 0.0
2023 42 21 0.00 0.0
2022 76 20 0.00 0.0
2021 44 15 0.00 0.0
2020 67 25 0.00 0.0
2019 48 38 0.17 0.0
2018 63 35 0.00 0.0
2017 44 37 0.48 0.0
2016 69 31 0.00 0.0
2015 64 26 0.00 0.0
2014 66 27 0.00 0.0
2013 57 28 0.00 0.0
2012 66 35 0.00 0.0
2011 62 36 0.07 0.0
2010 65 35 0.01 0.0
2009 72 38 0.00 0.0
2008 51 19 0.00 0.0
2007 60 26 0.00 0.0
2006 72 25 0.00 0.0
2005 39 30 0.33 2.2
2004 51 31 0.00 0.0
2003 68 24 0.00 0.0
2002 50 18 0.00 0.0
2001 40 32 0.13 0.5
2000 71 35 0.00 0.0
1999 50 34 0.00 0.0
1998 60 29 0.00 0.0
1997 55 24 0.00 n/a
1996 42 22 0.30 3.0
1995 47 31 0.05 0.3
1994 81 38 0.00 0.0
1993 64 25 0.00 0.0
1992 67 27 0.00 0.0
1991 52 35 0.06 0.0
1990 74 45 0.00 0.0
1989 83 44 0.00 0.0
1988 59 29 0.18 1.0
1987 60 29 0.00 0.0
1986 69 41 0.00 0.0
1985 55 35 0.00 0.0
1984 49 28 0.08 1.6
1983 58 40 0.19 0.0
1982 55 19 0.00 0.0
1981 62 34 0.41 0.0
1980 80 45 0.00 0.0
1979 64 26 0.00 0.0
1978 60 31 0.00 0.0
1977 65 32 0.00 0.0
1976 55 35 0.00 0.0
1975 59 26 0.00 0.0
1974 41 31 0.36 2.8
1973 41 14 0.02 0.4
1972 58 29 0.00 0.0
1971 40 32 0.31 0.0
1970 45 26 0.03 0.4
1969 74 27 0.00 0.0
1968 38 26 0.23 0.5
1967 43 15 0.00 0.0
1966 46 25 0.00 0.0
1965 73 39 0.00 0.0
1964 58 33 0.00 0.0
1963 34 24 0.24 2.7
1962 53 32 0.57 0.6
1961 58 33 0.00 0.0
1960 76 35 0.00 0.0
1959 48 16 0.00 0.0
1958 54 32 0.20 2.0
1957 70 44 0.00 0.0
1956 68 36 0.05 0.0
1955 65 37 0.00 0.0
1954 49 24 0.00 0.0
1953 76 39 0.00 0.0
1952 42 32 0.03 0.7
1951 29 17 0.00 0.0
1950 67 43 0.00 0.0
1949 64 33 0.00 0.0
1948 n/a n/a n/a n/a
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 73 28 0.00 0.0
1938 66 29 0.00 0.0
1937 69 42 0.00 0.0
1936 58 36 0.00 0.0
1935 68 42 0.00 0.0
1934 76 34 0.00 0.0
1933 n/a 32 0.00 0.0
1932 68 41 n/a n/a
1931 53 18 n/a n/a
1930 68 37 n/a n/a
1929 57 36 0.02 0.0
1928 48 29 0.06 n/a
1927 50 23 n/a n/a
1926 67 40 n/a n/a
1925 65 39 n/a n/a
1924 62 29 n/a n/a
1923 52 27 0.04 0.5
1922 66 29 0.00 n/a
1921 54 32 0.24 0.0
1920 50 27 0.10 0.0
1919 n/a n/a n/a n/a
1918 51 33 0.00 0.0
1917 63 39 0.00 n/a
1916 60 28 0.00 0.0
1915 n/a n/a n/a n/a
1914 62 41 0.00 0.0
1913 n/a n/a n/a n/a
1912 56 31 0.85 0.0
1911 72 25 0.00 0.0
1910 n/a n/a n/a n/a
1909 n/a n/a n/a n/a
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 54 30 0.65 2.0
1901 75 39 0.00 n/a
What's the all-time high for Casper on 4/21?
For the date of Apr 21, the highest temperature ever reached in Casper history is 83 °F which happened in 1989.
Highest Temperatures in Casper on April 21
Rank Temperature Year
1 83 °F 1989
2 81 °F 1994
3 80 °F 1980
4 76 °F 1960
4 76 °F 1953
4 76 °F 1934
4 76 °F 2022
8 75 °F 1901
9 74 °F 1990
9 74 °F 1969
What's the all-time low for Casper on 4/21?
For the date of Apr 21, the lowest temperature ever reached in Casper history is 14 °F which happened in 1973.
Lowest Temperatures in Casper on April 21
Rank Temperature Year
1 14 °F 1973
2 15 °F 2021
2 15 °F 1967
4 16 °F 1959
5 17 °F 1951
6 18 °F 1931
6 18 °F 2002
6 18 °F 2024
9 19 °F 2008
9 19 °F 1982
Lowest High Temperatures in Casper on April 21
Rank Temperature Year
1 29 °F 1951
2 34 °F 1963
3 38 °F 1968
4 39 °F 2005
5 40 °F 1971
5 40 °F 2001
7 41 °F 1974
7 41 °F 1973
9 42 °F 2023
9 42 °F 1996
9 42 °F 1952
What's the most it has ever rained in Casper on 4/21?
For the date of Apr 21, the most precipitation ever recorded in Casper history is 0.85 inches which happened in 1912.
All-Time Most Precipitation in Casper on April 21
Rank Precipitation Year
1 0.85 inches 1912
2 0.65 inches 1902
3 0.57 inches 1962
4 0.48 inches 2017
5 0.41 inches 1981
6 0.36 inches 1974
7 0.33 inches 2005
8 0.31 inches 1971
9 0.30 inches 1996
10 0.24 inches 1963
10 0.24 inches 1921
All-Time Most Snow in Casper on April 21
Rank Precipitation Year
1 3.0 inches 1996
2 2.8 inches 1974
3 2.7 inches 1963
4 2.2 inches 2005
5 2.0 inches 1958
5 2.0 inches 1902
7 1.6 inches 1984
8 1.0 inches 1988
9 0.7 inches 1952
10 0.6 inches 1962
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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