Casper September 20 Weather Records

Daily averages and all-time records for weather in Casper, Wyoming for the date of September 20.
September 20 All-Time Records
1900–2024
Highest temperature 100 °F 1911
Lowest temperature 16 °F 1983
Lowest daily high 34 °F 1995
Highest daily low 65 °F 1920
Most precipitation 2.01 inches 1989
Most snow 6.9 inches 1995
September 20 Average Weather
1991–2020 1
Average high 73.2 °F
Average low 40.8 °F
Chance precipitation 25.5%
Chance snow 3.9%
Casper September 20 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 76 43 0.01 0.0
2022 81 41 0.04 0.0
2021 57 35 0.05 0.0
2020 74 47 0.00 0.0
2019 73 43 0.01 0.0
2018 70 38 0.01 0.0
2017 67 36 0.00 0.0
2016 88 51 0.00 0.0
2015 81 40 0.00 0.0
2014 79 44 0.00 0.0
2013 75 27 0.00 0.0
2012 80 38 0.00 0.0
2011 63 33 0.00 0.0
2010 84 47 0.00 0.0
2009 68 40 0.90 0.0
2008 81 36 0.00 0.0
2007 84 36 0.00 0.0
2006 73 37 0.00 0.0
2005 85 48 0.00 0.0
2004 64 40 0.05 0.0
2003 67 38 0.00 0.0
2002 73 44 0.00 0.0
2001 72 40 0.00 0.0
2000 56 33 0.00 0.0
1999 64 39 0.00 0.0
1998 56 45 0.28 n/a
1997 55 43 0.01 n/a
1996 62 35 0.00 n/a
1995 34 28 0.68 6.9
1994 78 45 0.00 0.0
1993 78 42 0.00 0.0
1992 81 49 0.01 0.0
1991 82 38 0.00 0.0
1990 53 38 0.11 0.0
1989 56 42 2.01 0.0
1988 79 34 0.00 0.0
1987 72 35 0.00 0.0
1986 77 41 0.02 0.0
1985 62 25 0.00 0.0
1984 83 44 0.00 0.0
1983 48 16 0.00 0.0
1982 70 35 0.00 0.0
1981 75 46 0.00 0.0
1980 73 41 0.00 0.0
1979 73 42 0.00 0.0
1978 52 26 0.00 0.0
1977 78 48 0.00 0.0
1976 68 45 0.00 0.0
1975 59 26 0.00 0.0
1974 57 39 0.00 0.0
1973 80 46 0.00 0.0
1972 64 33 0.00 0.0
1971 59 33 0.14 1.4
1970 70 37 0.00 0.0
1969 84 42 0.00 0.0
1968 83 46 0.00 0.0
1967 76 46 0.00 0.0
1966 86 44 0.00 0.0
1965 45 26 0.02 0.0
1964 68 35 0.00 0.0
1963 64 53 0.06 0.0
1962 82 47 0.01 0.0
1961 61 41 0.00 0.0
1960 82 54 0.00 0.0
1959 68 46 0.00 0.0
1958 63 40 0.00 0.0
1957 54 32 0.00 0.0
1956 89 49 0.00 0.0
1955 66 47 0.31 0.0
1954 70 42 0.00 0.0
1953 63 40 0.00 0.0
1952 67 48 0.00 0.0
1951 64 35 0.13 0.0
1950 55 45 1.76 0.0
1949 74 43 0.00 0.0
1948 69 48 0.27 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 0.49 n/a
1939 83 43 0.00 0.0
1938 86 36 0.00 0.0
1937 n/a n/a n/a n/a
1936 81 38 0.00 0.0
1935 80 43 0.00 0.0
1934 60 n/a 0.00 0.0
1933 n/a n/a 0.00 0.0
1932 79 49 0.00 0.0
1931 66 46 0.00 n/a
1930 82 35 n/a n/a
1929 83 42 0.03 n/a
1928 69 55 0.15 n/a
1927 70 32 n/a n/a
1926 84 40 0.00 n/a
1925 69 33 0.14 0.0
1924 55 35 0.40 n/a
1923 76 39 n/a n/a
1922 83 36 0.00 n/a
1921 69 43 0.00 n/a
1920 84 65 0.00 n/a
1919 n/a n/a n/a n/a
1918 n/a n/a n/a n/a
1917 82 38 0.00 0.0
1916 77 37 0.00 n/a
1915 78 33 0.00 0.0
1914 83 61 0.05 0.0
1913 n/a n/a n/a n/a
1912 n/a n/a n/a n/a
1911 100 59 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 85 30 0.00 0.0
What's the all-time high for Casper on 9/20?
For the date of Sep 20, the highest temperature ever reached in Casper history is 100 °F which happened in 1911.
Highest Temperatures in Casper on September 20
Rank Temperature Year
1 100 °F 1911
2 89 °F 1956
3 88 °F 2016
4 86 °F 1938
4 86 °F 1966
6 85 °F 2005
6 85 °F 1901
8 84 °F 2010
8 84 °F 1926
8 84 °F 2007
8 84 °F 1920
8 84 °F 1969
What's the all-time low for Casper on 9/20?
For the date of Sep 20, the lowest temperature ever reached in Casper history is 16 °F which happened in 1983.
Lowest Temperatures in Casper on September 20
Rank Temperature Year
1 16 °F 1983
2 25 °F 1985
3 26 °F 1975
3 26 °F 1978
3 26 °F 1965
6 27 °F 2013
7 28 °F 1995
8 30 °F 1901
9 32 °F 1957
9 32 °F 1927
Lowest High Temperatures in Casper on September 20
Rank Temperature Year
1 34 °F 1995
2 45 °F 1965
3 48 °F 1983
4 52 °F 1978
5 53 °F 1990
6 54 °F 1957
7 55 °F 1950
7 55 °F 1924
7 55 °F 1997
10 56 °F 1998
10 56 °F 2000
10 56 °F 1989
What's the most it has ever rained in Casper on 9/20?
For the date of Sep 20, the most precipitation ever recorded in Casper history is 2.01 inches which happened in 1989.
All-Time Most Precipitation in Casper on September 20
Rank Precipitation Year
1 2.01 inches 1989
2 1.76 inches 1950
3 0.90 inches 2009
4 0.68 inches 1995
5 0.49 inches 1940
6 0.40 inches 1924
7 0.31 inches 1955
8 0.28 inches 1998
9 0.27 inches 1948
10 0.15 inches 1928
All-Time Most Snow in Casper on September 20
Rank Precipitation Year
1 6.9 inches 1995
2 1.4 inches 1971
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.
© H Brothers Inc, 2021–2024
Contact us | Privacy policy