Waterloo May 21 Weather Records

Daily averages and all-time records for weather in Waterloo, Iowa for the date of May 21.
May 21 All-Time Records
1895–2024
Highest temperature 93 °F 1934
Lowest temperature 33 °F 1931
Lowest daily high 50 °F 1969
Highest daily low 70 °F 1934
Most precipitation 1.49 inches 2004
Most snow none -
May 21 Average Weather
1991–2020 1
Average high 73.3 °F
Average low 50.7 °F
Chance precipitation 42.3%
Chance snow 0%
Waterloo May 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 80 44 0.00 0.0
2022 60 44 0.00 0.0
2021 79 67 0.11 0.0
2020 64 59 0.00 0.0
2019 53 49 0.59 0.0
2018 62 53 0.77 0.0
2017 53 45 0.00 0.0
2016 81 42 0.00 0.0
2015 76 38 0.00 0.0
2014 79 51 0.00 0.0
2013 69 56 0.00 0.0
2012 78 41 0.00 0.0
2011 77 58 0.57 0.0
2010 66 52 0.02 0.0
2009 78 57 0.00 0.0
2008 70 36 0.00 0.0
2007 85 59 0.00 0.0
2006 66 47 0.00 0.0
2005 63 46 0.42 0.0
2004 76 60 1.49 0.0
2003 66 39 0.00 0.0
2002 65 36 0.00 0.0
2001 65 47 0.21 0.0
2000 73 53 0.33 0.0
1999 72 60 0.34 0.0
1998 79 51 0.00 0.0
1997 66 35 0.00 0.0
1996 78 50 0.00 0.0
1995 74 42 0.00 0.0
1994 87 51 0.00 0.0
1993 74 37 0.00 0.0
1992 84 60 0.00 0.0
1991 77 63 0.48 0.0
1990 60 43 0.00 0.0
1989 81 49 0.00 0.0
1988 87 55 0.00 0.0
1987 84 51 0.00 0.0
1986 71 37 0.00 0.0
1985 71 43 0.00 0.0
1984 77 56 0.00 0.0
1983 74 50 0.18 0.0
1982 57 46 1.25 0.0
1981 83 48 0.00 0.0
1980 80 45 0.00 0.0
1979 64 37 0.00 0.0
1978 69 44 0.00 0.0
1977 79 50 0.43 0.0
1976 77 55 0.00 0.0
1975 77 65 0.09 0.0
1974 82 63 0.00 0.0
1973 78 60 0.22 0.0
1972 87 58 0.00 0.0
1971 63 40 0.00 0.0
1970 90 67 0.00 0.0
1969 50 39 0.44 0.0
1968 67 40 0.00 0.0
1967 70 44 0.00 0.0
1966 76 46 0.00 0.0
1965 82 60 0.00 0.0
1964 88 51 0.00 0.0
1963 52 36 0.00 0.0
1962 77 57 0.10 0.0
1961 73 45 0.00 0.0
1960 64 51 0.08 0.0
1959 74 57 0.48 0.0
1958 77 38 0.00 0.0
1957 78 52 0.06 0.0
1956 86 55 0.00 0.0
1955 86 56 0.00 0.0
1954 73 49 0.00 0.0
1953 77 48 0.20 0.0
1952 67 46 0.11 0.0
1951 71 51 0.00 0.0
1950 70 51 0.08 0.0
1949 57 49 0.00 0.0
1948 78 63 n/a 0.0
1947 69 40 n/a 0.0
1946 70 38 0.00 0.0
1945 79 49 n/a 0.0
1944 77 62 0.52 0.0
1943 79 43 0.00 0.0
1942 68 37 0.00 0.0
1941 86 60 n/a 0.0
1940 78 58 0.00 0.0
1939 85 60 n/a 0.0
1938 67 52 0.11 0.0
1937 75 59 0.50 0.0
1936 84 59 0.00 0.0
1935 81 44 0.00 0.0
1934 93 70 0.00 0.0
1933 71 56 n/a 0.0
1932 79 52 0.00 0.0
1931 55 33 0.00 0.0
1930 88 61 0.00 0.0
1929 71 35 0.00 0.0
1928 72 49 0.00 0.0
1927 86 56 n/a 0.0
1926 69 53 n/a 0.0
1925 87 59 0.00 0.0
1924 61 41 n/a 0.0
1923 72 43 n/a 0.0
1922 84 53 n/a 0.0
1921 90 64 0.00 0.0
1920 80 55 n/a 0.0
1919 60 43 0.00 0.0
1918 66 48 n/a 0.0
1917 72 46 n/a 0.0
1916 58 51 0.30 0.0
1915 55 46 0.26 0.0
1914 80 61 0.01 0.0
1913 69 48 1.27 0.0
1912 64 43 0.00 0.0
1911 76 58 0.38 0.0
1910 77 54 0.45 0.0
1909 75 49 0.00 0.0
1908 83 62 n/a 0.0
1907 63 46 n/a 0.0
1906 65 51 0.00 0.0
1905 77 50 0.00 0.0
1904 81 49 0.00 0.0
1903 79 59 n/a 0.0
1902 81 67 0.18 0.0
1901 69 46 n/a 0.0
1900 80 47 n/a 0.0
1899 58 42 n/a 0.0
1898 72 56 1.04 0.0
1897 65 49 0.00 0.0
1896 77 52 0.00 0.0
1895 67 34 0.00 0.0
What's the all-time high for Waterloo on 5/21?
For the date of May 21, the highest temperature ever reached in Waterloo history is 93 °F which happened in 1934.
Highest Temperatures in Waterloo on May 21
Rank Temperature Year
1 93 °F 1934
2 90 °F 1921
2 90 °F 1970
4 88 °F 1930
4 88 °F 1964
6 87 °F 1994
6 87 °F 1925
6 87 °F 1988
6 87 °F 1972
10 86 °F 1927
10 86 °F 1941
10 86 °F 1955
10 86 °F 1956
What's the all-time low for Waterloo on 5/21?
For the date of May 21, the lowest temperature ever reached in Waterloo history is 33 °F which happened in 1931.
Lowest Temperatures in Waterloo on May 21
Rank Temperature Year
1 33 °F 1931
2 34 °F 1895
3 35 °F 1929
3 35 °F 1997
5 36 °F 2008
5 36 °F 2002
5 36 °F 1963
8 37 °F 1993
8 37 °F 1986
8 37 °F 1942
8 37 °F 1979
Lowest High Temperatures in Waterloo on May 21
Rank Temperature Year
1 50 °F 1969
2 52 °F 1963
3 53 °F 2017
3 53 °F 2019
5 55 °F 1931
5 55 °F 1915
7 57 °F 1949
7 57 °F 1982
9 58 °F 1916
9 58 °F 1899
What's the most it has ever rained in Waterloo on 5/21?
For the date of May 21, the most precipitation ever recorded in Waterloo history is 1.49 inches which happened in 2004.
All-Time Most Precipitation in Waterloo on May 21
Rank Precipitation Year
1 1.49 inches 2004
2 1.27 inches 1913
3 1.25 inches 1982
4 1.04 inches 1898
5 0.77 inches 2018
6 0.59 inches 2019
7 0.57 inches 2011
8 0.52 inches 1944
9 0.50 inches 1937
10 0.48 inches 1991
10 0.48 inches 1959
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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