Casper September 21 Weather Records

Daily averages and all-time records for weather in Casper, Wyoming for the date of September 21.
September 21 All-Time Records
1900–2024
Highest temperature 100 °F 1911
Lowest temperature 21 °F 1983
Lowest daily high 42 °F 1971
Highest daily low 62 °F 1933
Most precipitation 1.09 inches 1962
Most snow 4.9 inches 1994
September 21 Average Weather
1991–2020 1
Average high 72.5 °F
Average low 40.4 °F
Chance precipitation 26.0%
Chance snow 4.5%
Casper September 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 77 38 0.00 0.0
2022 65 45 0.00 0.0
2021 68 32 0.00 0.0
2020 81 34 0.00 0.0
2019 66 41 0.16 0.0
2018 79 29 0.00 0.0
2017 76 38 0.00 0.0
2016 78 47 0.10 0.0
2015 84 49 0.00 0.0
2014 77 38 0.00 0.0
2013 83 47 0.00 0.0
2012 80 38 0.00 0.0
2011 66 25 0.00 0.0
2010 80 34 0.00 0.0
2009 55 38 0.22 0.0
2008 76 54 0.00 0.0
2007 76 34 0.00 0.0
2006 60 38 0.12 0.0
2005 76 48 0.01 0.0
2004 43 37 0.07 0.0
2003 68 33 0.00 0.0
2002 55 29 0.00 0.0
2001 82 39 0.00 0.0
2000 57 32 0.11 0.5
1999 76 40 0.00 0.0
1998 51 43 0.36 n/a
1997 51 45 0.00 n/a
1996 67 39 0.00 n/a
1995 43 26 0.02 0.2
1994 58 32 0.52 4.9
1993 64 46 0.00 0.0
1992 74 45 0.06 0.0
1991 82 40 0.00 0.0
1990 68 37 0.00 0.0
1989 64 42 0.05 0.0
1988 76 34 0.00 0.0
1987 75 34 0.00 0.0
1986 67 45 0.02 0.0
1985 64 41 0.03 0.0
1984 70 34 0.01 0.0
1983 66 21 0.00 0.0
1982 80 39 0.00 0.0
1981 79 45 0.00 0.0
1980 62 34 0.02 0.0
1979 80 37 0.00 0.0
1978 64 30 0.00 0.0
1977 65 41 0.13 0.0
1976 75 40 0.00 0.0
1975 65 29 0.00 0.0
1974 65 32 0.00 0.0
1973 64 42 0.16 0.0
1972 73 28 0.00 0.0
1971 42 29 0.07 0.8
1970 61 33 0.00 0.0
1969 73 44 0.12 0.0
1968 58 40 0.00 0.0
1967 82 42 0.00 0.0
1966 85 49 0.00 0.0
1965 50 32 0.24 0.0
1964 62 39 0.00 0.0
1963 69 50 0.12 0.0
1962 65 51 1.09 0.0
1961 52 32 0.48 0.4
1960 59 38 0.03 0.0
1959 57 38 0.43 0.0
1958 82 37 0.00 0.0
1957 53 36 0.01 0.0
1956 68 45 0.02 0.0
1955 71 38 0.00 0.0
1954 79 33 0.00 0.0
1953 75 34 0.00 0.0
1952 64 42 0.00 0.0
1951 49 32 0.01 0.3
1950 65 46 0.01 0.0
1949 77 35 0.00 0.0
1948 80 43 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 0.24 n/a
1939 84 45 0.00 0.0
1938 87 40 0.00 0.0
1937 n/a n/a n/a n/a
1936 83 38 0.00 0.0
1935 84 35 0.00 0.0
1934 69 26 0.00 0.0
1933 82 62 0.00 0.0
1932 76 42 0.00 0.0
1931 63 45 0.00 n/a
1930 84 42 n/a n/a
1929 77 58 n/a n/a
1928 71 33 n/a n/a
1927 73 35 n/a n/a
1926 84 45 n/a n/a
1925 58 41 0.67 n/a
1924 61 35 n/a n/a
1923 79 61 n/a n/a
1922 84 38 0.00 n/a
1921 75 49 0.00 n/a
1920 84 61 0.00 n/a
1919 n/a n/a n/a n/a
1918 n/a n/a n/a n/a
1917 82 41 0.00 0.0
1916 70 33 0.00 n/a
1915 75 24 0.00 0.0
1914 63 41 0.00 0.0
1913 n/a n/a n/a n/a
1912 n/a n/a n/a n/a
1911 100 57 n/a 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 80 59 0.00 0.0
What's the all-time high for Casper on 9/21?
For the date of Sep 21, the highest temperature ever reached in Casper history is 100 °F which happened in 1911.
Highest Temperatures in Casper on September 21
Rank Temperature Year
1 100 °F 1911
2 87 °F 1938
3 85 °F 1966
4 84 °F 1920
4 84 °F 1922
4 84 °F 1939
4 84 °F 1926
4 84 °F 2015
4 84 °F 1930
4 84 °F 1935
What's the all-time low for Casper on 9/21?
For the date of Sep 21, the lowest temperature ever reached in Casper history is 21 °F which happened in 1983.
Lowest Temperatures in Casper on September 21
Rank Temperature Year
1 21 °F 1983
2 24 °F 1915
3 25 °F 2011
4 26 °F 1995
4 26 °F 1934
6 28 °F 1972
7 29 °F 2002
7 29 °F 1975
7 29 °F 1971
7 29 °F 2018
Lowest High Temperatures in Casper on September 21
Rank Temperature Year
1 42 °F 1971
2 43 °F 1995
2 43 °F 2004
4 49 °F 1951
5 50 °F 1965
6 51 °F 1997
6 51 °F 1998
8 52 °F 1961
9 53 °F 1957
10 55 °F 2009
10 55 °F 2002
What's the most it has ever rained in Casper on 9/21?
For the date of Sep 21, the most precipitation ever recorded in Casper history is 1.09 inches which happened in 1962.
All-Time Most Precipitation in Casper on September 21
Rank Precipitation Year
1 1.09 inches 1962
2 0.67 inches 1925
3 0.52 inches 1994
4 0.48 inches 1961
5 0.43 inches 1959
6 0.36 inches 1998
7 0.24 inches 1940
7 0.24 inches 1965
9 0.22 inches 2009
10 0.16 inches 2019
10 0.16 inches 1973
All-Time Most Snow in Casper on September 21
Rank Precipitation Year
1 4.9 inches 1994
2 0.8 inches 1971
3 0.5 inches 2000
4 0.4 inches 1961
5 0.3 inches 1951
6 0.2 inches 1995
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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