Waterloo August 20 Weather Records

Daily averages and all-time records for weather in Waterloo, Iowa for the date of August 20.
August 20 All-Time Records
1895–2024
Highest temperature 100 °F 1916
Lowest temperature 33 °F 1950
Lowest daily high 66 °F 1950
Highest daily low 74 °F 2003
Most precipitation 4.92 inches 1966
Most snow none -
August 20 Average Weather
1991–2020 1
Average high 81.5 °F
Average low 59.2 °F
Chance precipitation 28.6%
Chance snow 0%
Waterloo August 20 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 97 72 0.00 0.0
2022 80 64 0.84 0.0
2021 92 66 0.76 0.0
2020 87 62 0.00 0.0
2019 86 64 1.75 0.0
2018 74 62 0.98 0.0
2017 87 65 0.00 0.0
2016 73 58 0.06 0.0
2015 76 53 0.00 0.0
2014 77 61 0.00 0.0
2013 87 67 0.00 0.0
2012 81 50 0.00 0.0
2011 82 61 0.06 0.0
2010 81 67 0.00 0.0
2009 74 60 0.12 0.0
2008 84 64 0.00 0.0
2007 81 68 1.26 0.0
2006 79 53 0.00 0.0
2005 83 64 0.00 0.0
2004 74 48 0.00 0.0
2003 98 74 0.00 0.0
2002 79 49 0.00 0.0
2001 81 51 0.00 0.0
2000 78 55 0.00 0.0
1999 78 53 0.00 0.0
1998 88 67 0.46 0.0
1997 74 53 0.12 0.0
1996 84 65 0.00 0.0
1995 83 54 0.00 0.0
1994 76 55 0.00 0.0
1993 80 61 0.00 0.0
1992 76 46 0.00 0.0
1991 73 48 0.04 0.0
1990 72 64 0.23 0.0
1989 86 61 0.00 0.0
1988 89 57 0.00 0.0
1987 84 54 1.36 0.0
1986 77 51 0.00 0.0
1985 70 43 0.00 0.0
1984 81 53 0.00 0.0
1983 97 70 0.10 0.0
1982 82 61 0.00 0.0
1981 78 43 0.00 0.0
1980 91 72 0.42 0.0
1979 86 69 0.00 0.0
1978 83 45 0.00 0.0
1977 71 55 0.01 0.0
1976 87 56 0.00 0.0
1975 86 66 0.05 0.0
1974 89 70 0.00 0.0
1973 82 59 0.00 0.0
1972 92 69 0.00 0.0
1971 88 58 0.00 0.0
1970 78 51 0.00 0.0
1969 73 59 0.11 0.0
1968 89 69 0.00 0.0
1967 77 42 0.00 0.0
1966 76 55 4.92 0.0
1965 76 52 0.00 0.0
1964 80 64 2.80 0.0
1963 86 50 0.00 0.0
1962 84 60 0.00 0.0
1961 77 49 0.00 0.0
1960 80 58 0.00 0.0
1959 92 74 0.00 0.0
1958 80 62 0.76 0.0
1957 79 53 0.00 0.0
1956 69 44 0.00 0.0
1955 96 68 0.00 0.0
1954 83 58 0.00 0.0
1953 79 46 0.00 0.0
1952 86 67 0.26 0.0
1951 72 61 0.03 0.0
1950 66 33 0.00 0.0
1949 76 47 0.00 0.0
1948 89 64 0.00 0.0
1947 96 74 0.00 0.0
1946 84 50 0.00 0.0
1945 89 66 n/a 0.0
1944 75 62 n/a 0.0
1943 77 62 0.00 0.0
1942 91 68 0.00 0.0
1941 86 52 n/a 0.0
1940 74 43 0.00 0.0
1939 75 55 0.27 0.0
1938 83 67 n/a 0.0
1937 79 68 1.15 0.0
1936 86 69 0.02 0.0
1935 78 71 1.45 0.0
1934 74 48 0.00 0.0
1933 71 55 n/a 0.0
1932 82 50 0.00 0.0
1931 84 60 0.00 0.0
1930 74 61 0.00 0.0
1929 77 55 0.00 0.0
1928 85 67 n/a 0.0
1927 77 48 0.00 0.0
1926 83 63 n/a 0.0
1925 81 61 0.06 0.0
1924 87 63 0.08 0.0
1923 79 61 n/a 0.0
1922 93 50 n/a 0.0
1921 80 55 0.00 0.0
1920 86 65 0.63 0.0
1919 87 63 0.00 0.0
1918 90 65 0.00 0.0
1917 93 62 0.00 0.0
1916 100 70 0.00 0.0
1915 79 48 0.00 0.0
1914 88 66 0.00 0.0
1913 86 71 0.00 0.0
1912 84 64 0.00 0.0
1911 78 55 0.00 0.0
1910 83 59 n/a 0.0
1909 88 57 0.00 0.0
1908 77 45 0.00 0.0
1907 78 49 n/a 0.0
1906 94 71 0.00 0.0
1905 85 56 n/a 0.0
1904 72 54 n/a 0.0
1903 83 52 0.00 0.0
1902 78 61 0.00 0.0
1901 95 60 0.00 0.0
1900 95 71 0.00 0.0
1899 83 64 n/a 0.0
1898 86 65 n/a 0.0
1897 76 41 0.00 0.0
1896 76 54 0.00 0.0
1895 82 49 0.00 0.0
What's the all-time high for Waterloo on 8/20?
For the date of Aug 20, the highest temperature ever reached in Waterloo history is 100 °F which happened in 1916.
Highest Temperatures in Waterloo on August 20
Rank Temperature Year
1 100 °F 1916
2 98 °F 2003
3 97 °F 1983
3 97 °F 2023
5 96 °F 1947
5 96 °F 1955
7 95 °F 1901
7 95 °F 1900
9 94 °F 1906
10 93 °F 1917
10 93 °F 1922
What's the all-time low for Waterloo on 8/20?
For the date of Aug 20, the lowest temperature ever reached in Waterloo history is 33 °F which happened in 1950.
Lowest Temperatures in Waterloo on August 20
Rank Temperature Year
1 33 °F 1950
2 41 °F 1897
3 42 °F 1967
4 43 °F 1940
4 43 °F 1981
4 43 °F 1985
7 44 °F 1956
8 45 °F 1908
8 45 °F 1978
10 46 °F 1992
10 46 °F 1953
Lowest High Temperatures in Waterloo on August 20
Rank Temperature Year
1 66 °F 1950
2 69 °F 1956
3 70 °F 1985
4 71 °F 1933
4 71 °F 1977
6 72 °F 1990
6 72 °F 1951
6 72 °F 1904
9 73 °F 1969
9 73 °F 2016
9 73 °F 1991
What's the most it has ever rained in Waterloo on 8/20?
For the date of Aug 20, the most precipitation ever recorded in Waterloo history is 4.92 inches which happened in 1966.
All-Time Most Precipitation in Waterloo on August 20
Rank Precipitation Year
1 4.92 inches 1966
2 2.80 inches 1964
3 1.75 inches 2019
4 1.45 inches 1935
5 1.36 inches 1987
6 1.26 inches 2007
7 1.15 inches 1937
8 0.98 inches 2018
9 0.84 inches 2022
10 0.76 inches 2021
10 0.76 inches 1958
Weather Station Details
Years Station Coordinates
1950–2024 Waterloo Municipal Airport location
1895–1950 Waterloo location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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