Casper August 21 Weather Records

Daily averages and all-time records for weather in Casper, Wyoming for the date of August 21.
August 21 All-Time Records
1900–2024
Highest temperature 100 °F 1912
Lowest temperature 38 °F 2016
Lowest daily high 62 °F 1964
Highest daily low 67 °F 2010
Most precipitation 0.28 inches 1987
Most snow none -
August 21 Average Weather
1991–2020 1
Average high 86.2 °F
Average low 50.9 °F
Chance precipitation 17.7%
Chance snow 0%
Casper August 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 94 48 0.00 0.0
2022 90 48 0.00 0.0
2021 80 39 0.00 0.0
2020 93 57 0.00 0.0
2019 91 51 0.00 0.0
2018 67 48 0.00 0.0
2017 82 47 0.00 0.0
2016 89 38 0.00 0.0
2015 91 48 0.00 0.0
2014 84 51 0.00 0.0
2013 86 60 0.00 0.0
2012 89 49 0.00 0.0
2011 92 50 0.00 0.0
2010 93 67 0.00 0.0
2009 90 42 0.00 0.0
2008 93 55 0.00 0.0
2007 86 47 0.00 0.0
2006 90 50 0.00 0.0
2005 87 44 0.00 0.0
2004 84 50 0.00 0.0
2003 89 51 0.00 0.0
2002 83 54 0.01 0.0
2001 88 56 0.00 0.0
2000 88 44 0.00 0.0
1999 73 53 0.05 0.0
1998 86 53 0.00 n/a
1997 88 57 0.00 n/a
1996 80 53 0.00 n/a
1995 93 53 0.00 0.0
1994 92 54 0.02 0.0
1993 82 58 0.00 0.0
1992 92 50 0.00 0.0
1991 93 57 0.00 0.0
1990 87 60 0.00 0.0
1989 84 52 0.00 0.0
1988 82 57 0.00 0.0
1987 86 58 0.28 0.0
1986 85 53 0.02 0.0
1985 90 53 0.00 0.0
1984 83 49 0.01 0.0
1983 88 57 0.02 0.0
1982 94 58 0.00 0.0
1981 87 56 0.00 0.0
1980 82 45 0.00 0.0
1979 75 51 0.00 0.0
1978 89 57 0.00 0.0
1977 86 48 0.00 0.0
1976 90 53 0.00 0.0
1975 84 55 0.00 0.0
1974 75 41 0.00 0.0
1973 91 64 0.13 0.0
1972 81 47 0.00 0.0
1971 93 57 0.00 0.0
1970 85 55 0.00 0.0
1969 92 56 0.00 0.0
1968 84 58 0.00 0.0
1967 91 58 0.00 0.0
1966 65 40 0.00 0.0
1965 76 45 0.03 0.0
1964 62 46 0.00 0.0
1963 86 54 0.00 0.0
1962 87 54 0.00 0.0
1961 83 58 0.00 0.0
1960 95 59 0.00 0.0
1959 87 54 0.00 0.0
1958 81 48 0.00 0.0
1957 86 60 0.05 0.0
1956 86 54 0.00 0.0
1955 88 55 0.00 0.0
1954 78 51 0.00 0.0
1953 89 57 0.00 0.0
1952 89 53 0.00 0.0
1951 80 50 0.00 0.0
1950 81 45 0.00 0.0
1949 95 47 0.00 0.0
1948 92 46 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 83 50 0.00 0.0
1938 91 45 0.00 n/a
1937 96 47 0.00 0.0
1936 81 49 0.00 0.0
1935 92 48 0.00 0.0
1934 75 50 0.00 0.0
1933 85 60 0.00 0.0
1932 95 56 0.00 0.0
1931 92 56 0.00 n/a
1930 90 60 n/a n/a
1929 90 66 n/a n/a
1928 89 45 n/a n/a
1927 82 49 0.04 n/a
1926 86 53 n/a n/a
1925 88 61 n/a n/a
1924 77 52 n/a n/a
1923 84 54 n/a n/a
1922 87 54 0.00 n/a
1921 85 61 0.00 n/a
1920 74 43 0.00 n/a
1919 n/a n/a n/a n/a
1918 n/a n/a n/a n/a
1917 87 48 0.00 0.0
1916 72 47 0.00 n/a
1915 75 40 0.00 0.0
1914 88 57 0.07 0.0
1913 89 56 0.00 n/a
1912 100 43 0.00 n/a
1911 100 57 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 83 47 0.00 0.0
What's the all-time high for Casper on 8/21?
For the date of Aug 21, the highest temperature ever reached in Casper history is 100 °F which has happened 2 times, most recently in 1912.
Highest Temperatures in Casper on August 21
Rank Temperature Year
1 100 °F 1912
1 100 °F 1911
3 96 °F 1937
4 95 °F 1932
4 95 °F 1960
4 95 °F 1949
7 94 °F 1982
7 94 °F 2023
9 93 °F 1995
9 93 °F 1991
9 93 °F 2010
9 93 °F 1971
9 93 °F 2020
9 93 °F 2008
What's the all-time low for Casper on 8/21?
For the date of Aug 21, the lowest temperature ever reached in Casper history is 38 °F which happened in 2016.
Lowest Temperatures in Casper on August 21
Rank Temperature Year
1 38 °F 2016
2 39 °F 2021
3 40 °F 1966
3 40 °F 1915
5 41 °F 1974
6 42 °F 2009
7 43 °F 1912
7 43 °F 1920
9 44 °F 2000
9 44 °F 2005
Lowest High Temperatures in Casper on August 21
Rank Temperature Year
1 62 °F 1964
2 65 °F 1966
3 67 °F 2018
4 72 °F 1916
5 73 °F 1999
6 74 °F 1920
7 75 °F 1979
7 75 °F 1915
7 75 °F 1974
7 75 °F 1934
What's the most it has ever rained in Casper on 8/21?
For the date of Aug 21, the most precipitation ever recorded in Casper history is 0.28 inches which happened in 1987.
All-Time Most Precipitation in Casper on August 21
Rank Precipitation Year
1 0.28 inches 1987
2 0.13 inches 1973
3 0.07 inches 1914
4 0.05 inches 1999
4 0.05 inches 1957
6 0.04 inches 1927
7 0.03 inches 1965
8 0.02 inches 1994
8 0.02 inches 1986
8 0.02 inches 1983
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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