Casper May 21 Weather Records

Daily averages and all-time records for weather in Casper, Wyoming for the date of May 21.
May 21 All-Time Records
1900–2024
Highest temperature 89 °F 1912
Lowest temperature 26 °F 2001
Lowest daily high 37 °F 1975
Highest daily low 64 °F 1901
Most precipitation 1.04 inches 1962
Most snow 2.5 inches 2019
May 21 Average Weather
1991–2020 1
Average high 69.0 °F
Average low 39.3 °F
Chance precipitation 35.7%
Chance snow 3.7%
Casper May 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 77 40 0.00 0.0
2022 50 27 0.00 0.0
2021 43 33 0.05 0.0
2020 69 42 0.00 0.0
2019 38 29 0.49 2.5
2018 77 37 0.00 0.0
2017 60 37 0.02 0.0
2016 81 45 0.00 0.0
2015 61 37 0.00 0.0
2014 70 46 0.00 0.0
2013 66 41 0.00 0.0
2012 83 42 0.00 0.0
2011 56 42 0.10 0.0
2010 59 40 0.01 0.0
2009 71 43 0.00 0.0
2008 85 42 0.11 0.0
2007 74 46 0.04 0.0
2006 87 43 0.04 0.0
2005 78 44 0.00 0.0
2004 73 41 0.07 0.0
2003 74 29 0.00 0.0
2002 76 41 0.02 0.0
2001 57 26 0.00 0.0
2000 75 43 0.00 0.0
1999 73 39 0.01 0.0
1998 74 45 0.00 n/a
1997 76 51 0.04 n/a
1996 69 30 0.00 n/a
1995 73 42 0.01 0.0
1994 75 43 0.00 0.0
1993 81 49 0.00 0.0
1992 56 42 0.51 0.0
1991 80 44 0.00 0.0
1990 74 39 0.00 0.0
1989 77 43 0.00 0.0
1988 64 37 0.00 0.0
1987 46 32 0.02 0.0
1986 82 46 0.00 0.0
1985 73 39 0.00 0.0
1984 68 45 0.46 0.0
1983 69 39 0.02 0.0
1982 69 36 0.00 0.0
1981 56 43 0.06 0.0
1980 83 43 0.00 0.0
1979 78 35 0.00 0.0
1978 75 45 0.00 0.0
1977 63 34 0.00 0.0
1976 69 42 0.00 0.0
1975 37 32 0.45 2.2
1974 56 35 0.00 0.0
1973 61 34 0.00 0.0
1972 69 48 0.00 0.0
1971 70 40 0.00 0.0
1970 68 48 0.00 0.0
1969 50 32 0.04 0.0
1968 70 34 0.21 0.0
1967 75 42 0.00 0.0
1966 86 45 0.00 0.0
1965 58 43 0.00 0.0
1964 87 53 0.00 0.0
1963 59 33 0.00 0.0
1962 55 37 1.04 0.0
1961 72 42 0.00 0.0
1960 81 46 0.00 0.0
1959 53 34 0.02 0.0
1958 86 56 0.00 0.0
1957 51 34 0.12 0.0
1956 79 49 0.00 0.0
1955 80 47 0.01 0.0
1954 85 55 0.07 0.0
1953 60 38 0.03 0.0
1952 53 41 0.00 0.0
1951 58 42 0.09 0.0
1950 75 40 0.00 0.0
1949 53 44 0.23 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 78 36 0.00 0.0
1938 65 34 0.00 0.0
1937 57 34 0.12 0.0
1936 70 40 0.00 0.0
1935 70 32 0.05 0.0
1934 81 45 0.00 0.0
1933 83 45 0.00 n/a
1932 81 50 0.00 0.0
1931 56 26 n/a n/a
1930 79 54 n/a n/a
1929 77 44 0.04 n/a
1928 74 38 n/a 0.0
1927 70 44 0.00 n/a
1926 77 46 0.09 n/a
1925 84 56 n/a n/a
1924 68 40 n/a n/a
1923 65 43 0.02 n/a
1922 71 51 0.16 n/a
1921 73 40 0.02 n/a
1920 76 40 0.00 n/a
1919 n/a n/a n/a n/a
1918 70 40 0.00 n/a
1917 45 32 0.80 n/a
1916 61 44 0.04 n/a
1915 n/a n/a n/a n/a
1914 62 45 0.24 0.0
1913 n/a n/a n/a n/a
1912 89 49 0.00 n/a
1911 67 34 0.00 n/a
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 n/a n/a n/a n/a
1901 84 64 0.00 n/a
What's the all-time high for Casper on 5/21?
For the date of May 21, the highest temperature ever reached in Casper history is 89 °F which happened in 1912.
Highest Temperatures in Casper on May 21
Rank Temperature Year
1 89 °F 1912
2 87 °F 1964
2 87 °F 2006
4 86 °F 1958
4 86 °F 1966
6 85 °F 2008
6 85 °F 1954
8 84 °F 1901
8 84 °F 1925
10 83 °F 1933
10 83 °F 2012
10 83 °F 1980
What's the all-time low for Casper on 5/21?
For the date of May 21, the lowest temperature ever reached in Casper history is 26 °F which has happened 2 times, most recently in 2001.
Lowest Temperatures in Casper on May 21
Rank Temperature Year
1 26 °F 1931
1 26 °F 2001
3 27 °F 2022
4 29 °F 2019
4 29 °F 2003
6 30 °F 1996
7 32 °F 1917
7 32 °F 1935
7 32 °F 1975
7 32 °F 1969
7 32 °F 1987
Lowest High Temperatures in Casper on May 21
Rank Temperature Year
1 37 °F 1975
2 38 °F 2019
3 43 °F 2021
4 45 °F 1917
5 46 °F 1987
6 50 °F 2022
6 50 °F 1969
8 51 °F 1957
9 53 °F 1949
9 53 °F 1959
9 53 °F 1952
What's the most it has ever rained in Casper on 5/21?
For the date of May 21, the most precipitation ever recorded in Casper history is 1.04 inches which happened in 1962.
All-Time Most Precipitation in Casper on May 21
Rank Precipitation Year
1 1.04 inches 1962
2 0.80 inches 1917
3 0.51 inches 1992
4 0.49 inches 2019
5 0.46 inches 1984
6 0.45 inches 1975
7 0.24 inches 1914
8 0.23 inches 1949
9 0.21 inches 1968
10 0.16 inches 1922
All-Time Most Snow in Casper on May 21
Rank Precipitation Year
1 2.5 inches 2019
2 2.2 inches 1975
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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