Waterloo May 20 Weather Records

Daily averages and all-time records for weather in Waterloo, Iowa for the date of May 20.
May 20 All-Time Records
1895–2024
Highest temperature 97 °F 1934
Lowest temperature 31 °F 1954
Lowest daily high 48 °F 2015
Highest daily low 72 °F 1975
Most precipitation 1.28 inches 1933
Most snow none -
May 20 Average Weather
1991–2020 1
Average high 73.0 °F
Average low 50.4 °F
Chance precipitation 41.7%
Chance snow 0%
Waterloo May 20 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 75 43 0.00 0.0
2022 73 52 0.00 0.0
2021 75 65 0.46 0.0
2020 66 57 0.00 0.0
2019 60 41 0.00 0.0
2018 59 52 0.00 0.0
2017 58 44 0.40 0.0
2016 74 49 0.00 0.0
2015 48 42 0.28 0.0
2014 86 60 0.00 0.0
2013 77 59 0.71 0.0
2012 78 49 0.00 0.0
2011 78 57 0.12 0.0
2010 73 50 0.02 0.0
2009 85 60 0.00 0.0
2008 69 42 0.00 0.0
2007 85 60 0.00 0.0
2006 79 42 0.00 0.0
2005 67 50 0.00 0.0
2004 84 64 0.00 0.0
2003 64 45 0.00 0.0
2002 60 35 0.00 0.0
2001 78 60 0.11 0.0
2000 69 40 0.00 0.0
1999 77 60 0.00 0.0
1998 77 56 0.01 0.0
1997 65 36 0.00 0.0
1996 69 56 0.20 0.0
1995 72 49 0.00 0.0
1994 85 48 0.00 0.0
1993 63 37 0.00 0.0
1992 87 55 0.00 0.0
1991 75 51 0.00 0.0
1990 52 45 0.00 0.0
1989 78 50 0.00 0.0
1988 85 51 0.00 0.0
1987 86 64 0.31 0.0
1986 66 40 0.00 0.0
1985 72 50 0.00 0.0
1984 79 50 0.00 0.0
1983 73 48 0.39 0.0
1982 78 57 0.67 0.0
1981 80 39 0.00 0.0
1980 74 45 0.00 0.0
1979 64 45 0.00 0.0
1978 69 50 0.00 0.0
1977 70 54 0.00 0.0
1976 82 59 0.00 0.0
1975 92 72 0.00 0.0
1974 81 60 0.00 0.0
1973 76 45 0.00 0.0
1972 89 55 0.00 0.0
1971 64 42 0.00 0.0
1970 86 61 0.00 0.0
1969 65 43 0.00 0.0
1968 62 42 0.00 0.0
1967 63 34 0.00 0.0
1966 67 39 0.00 0.0
1965 78 41 0.00 0.0
1964 77 49 0.00 0.0
1963 73 38 0.01 0.0
1962 79 57 0.00 0.0
1961 65 50 0.10 0.0
1960 74 59 0.15 0.0
1959 80 63 0.05 0.0
1958 75 40 0.00 0.0
1957 56 45 0.18 0.0
1956 81 49 0.00 0.0
1955 85 56 0.00 0.0
1954 68 31 0.00 0.0
1953 79 56 0.00 0.0
1952 67 47 0.00 0.0
1951 79 55 0.78 0.0
1950 69 53 0.00 0.0
1949 59 45 0.00 0.0
1948 89 55 n/a 0.0
1947 64 41 n/a 0.0
1946 56 41 0.05 0.0
1945 82 55 n/a 0.0
1944 80 59 0.67 0.0
1943 68 50 n/a 0.0
1942 62 42 0.00 0.0
1941 89 59 n/a 0.0
1940 77 42 0.05 0.0
1939 79 61 n/a 0.0
1938 70 53 0.19 0.0
1937 71 48 n/a 0.0
1936 74 52 0.00 0.0
1935 69 49 n/a 0.0
1934 97 62 0.00 0.0
1933 79 60 1.28 0.0
1932 87 50 0.00 0.0
1931 60 40 0.00 0.0
1930 79 43 0.00 0.0
1929 62 43 0.00 0.0
1928 69 49 0.00 0.0
1927 57 47 n/a 0.0
1926 71 38 0.00 0.0
1925 90 52 n/a 0.0
1924 67 31 0.00 0.0
1923 75 54 0.02 0.0
1922 81 45 n/a 0.0
1921 90 65 0.00 0.0
1920 75 49 0.05 0.0
1919 66 41 0.00 0.0
1918 76 46 0.02 0.0
1917 79 60 n/a 0.0
1916 68 47 n/a 0.0
1915 50 42 n/a 0.0
1914 80 60 0.00 0.0
1913 56 45 0.75 0.0
1912 74 46 0.01 0.0
1911 85 56 n/a 0.0
1910 76 57 n/a 0.0
1909 74 49 0.00 0.0
1908 85 56 n/a 0.0
1907 68 32 0.00 0.0
1906 65 43 n/a 0.0
1905 74 45 0.00 0.0
1904 74 48 0.00 0.0
1903 65 49 0.00 0.0
1902 87 60 0.29 0.0
1901 70 47 0.00 0.0
1900 79 40 0.00 0.0
1899 62 45 n/a 0.0
1898 67 55 n/a 0.0
1897 71 62 0.05 0.0
1896 72 47 0.00 0.0
1895 64 38 n/a 0.0
What's the all-time high for Waterloo on 5/20?
For the date of May 20, the highest temperature ever reached in Waterloo history is 97 °F which happened in 1934.
Highest Temperatures in Waterloo on May 20
Rank Temperature Year
1 97 °F 1934
2 92 °F 1975
3 90 °F 1921
3 90 °F 1925
5 89 °F 1972
5 89 °F 1948
5 89 °F 1941
8 87 °F 1992
8 87 °F 1932
8 87 °F 1902
What's the all-time low for Waterloo on 5/20?
For the date of May 20, the lowest temperature ever reached in Waterloo history is 31 °F which has happened 2 times, most recently in 1954.
Lowest Temperatures in Waterloo on May 20
Rank Temperature Year
1 31 °F 1924
1 31 °F 1954
3 32 °F 1907
4 34 °F 1967
5 35 °F 2002
6 36 °F 1997
7 37 °F 1993
8 38 °F 1963
8 38 °F 1895
8 38 °F 1926
Lowest High Temperatures in Waterloo on May 20
Rank Temperature Year
1 48 °F 2015
2 50 °F 1915
3 52 °F 1990
4 56 °F 1957
4 56 °F 1946
4 56 °F 1913
7 57 °F 1927
8 58 °F 2017
9 59 °F 2018
9 59 °F 1949
What's the most it has ever rained in Waterloo on 5/20?
For the date of May 20, the most precipitation ever recorded in Waterloo history is 1.28 inches which happened in 1933.
All-Time Most Precipitation in Waterloo on May 20
Rank Precipitation Year
1 1.28 inches 1933
2 0.78 inches 1951
3 0.75 inches 1913
4 0.71 inches 2013
5 0.67 inches 1982
5 0.67 inches 1944
7 0.46 inches 2021
8 0.40 inches 2017
9 0.39 inches 1983
10 0.31 inches 1987
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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