(The following records are for the entire day...not necessarily race time...unless otherwise noted)
Coldest Minimum Temperature: 36 degrees May 4, 1940 and May 4, 1957
Coldest Maximum Temperature: 47 degrees May 4, 1935 and May 4, 1957* (record for the date)
Coldest Average Daily Temperature: 42 degrees May 4, 1957
Warmest Maximum Temperature: 94 degrees May 2, 1959
Warmest Average Daily Temperature: 79 degrees May 14, 1886
Warmest Minimum Temperature: 72 degrees May 14, 1886
Wettest: 2.31" of rain May 11, 1918
Sleet has been recorded on Derby Day. On May 6, 1989, sleet fell from 1:01pm to 1:05pm EDT (along with rain). Snow then fell the following morning (just flurries).
*The record cold temperatures on Derby Day 1957 were accompanied by north winds of 20 to 25mph!
Out of 134 Derby Days, 61 experienced precipitation at some point during the day (46%).
Longest stretch of consecutive wet Derby Days: 6 (1989 - 1994)
Longest stretch of consecutive dry Derby Days: 12 (1875 - 1886)
In the following table, a "T" for precipitation means there were just a few sprinkles.
| Date | High Temp | Low Temp | Precipitation | Miscellaneous |
| 5/17/1875 | 68 | 46 | 0 | |
| 5/15/1876 | 86 | 65 | 0 | |
| 5/22/1877 | 81 | 63 | 0 | |
| 5/21/1878 | 76 | 64 | 0 | |
| 5/20/1879 | 90 | 63 | 0 | |
| 5/18/1880 | 86 | 62 | 0 | |
| 5/17/1881 | 75 | 55 | 0 | |
| 5/16/1882 | 63 | 44 | 0 | |
| 5/23/1883 | 67 | 44 | 0 | |
| 5/16/1884 | 68 | 55 | 0 | |
| 5/14/1885 | 73 | 50 | 0 | |
| 5/14/1886 | 85 | 72 | 0 | |
| 5/11/1887 | 79 | 59 | T | |
| 5/14/1888 | 56 | 42 | 0 | |
| 5/9/1889 | 90 | 66 | 0 | |
| 5/14/1890 | 63 | 54 | 0.31" | |
| 5/13/1891 | 71 | 53 | 0 | |
| 5/11/1892 | 55 | 51 | T | |
| 5/10/1893 | 79 | 54 | 0 | |
| 5/15/1894 | 87 | 66 | 0.04" | rain from 12:30pm to 1:40pm |
| 5/06/1895 | 82 | 66 | 0 | |
| 5/06/1896 | 84 | 60 | 0 | |
| 5/12/1897 | 76 | 61 | 0.82" | rain from 3:10pm to 9pm and again after 10pm |
| 5/4/1898 | 62 | 57 | 0.35" | rain from 7am to 7:05am, 10:05am to 11:55am, and 12:34pm to 3:10pm |
| 5/4/1899 | 80 | 60 | T | sprinkles from 12:38pm to 12:40pm and 5:20pm to 5:35pm |
| 5/3/1900 | 66 | 46 | 0 | |
| 4/29/1901 | 83 | 52 | 0 | |
| 5/3/1902 | 89 | 65 | 0 | |
| 5/2/1903 | 74 | 40 | 0 | |
| 5/2/1904 | 73 | 55 | 0 | sprinkles from 4:12pm to 4:17pm |
| 5/10/1905 | 89 | 63 | 0.58" | thunderstorm between 6am and 8am |
| 5/2/1906 | 83 | 63 | 0.25" | southwest winds gusted to 35 mph |
| 5/6/1907 | 67 | 56 | 0.67" | rain from before midnight through 7:55am |
| 5/5/1908 | 72 | 52 | 0.72" | thunderstorm. rain from before midnight through 6:03am. |
| 5/3/1909 | 57 | 43 | 0.21" | rain from 5:40am to 6:45am, 7:15am to 11:40am, and 5:10pm to 5:12pm. |
| 5/10/1910 | 82 | 61 | 0 | |
| 5/13/1911 | 82 | 60 | 0 | |
| 5/11/1912 | 77 | 60 | 1.04" | A halo was observed around the sun. Thunderstorm. Rain fell for much of the morning before 9:30am, and again from about 5pm to 8pm. |
| 5/10/1913 | 61 | 46 | 0 | |
| 5/9/1914 | 72 | 49 | 0 | |
| 5/8/1915 | 71 | 51 | T | Sprinkles fell from 6:30pm to 6:32pm and from 7:31pm to 7:45pm. |
| 5/13/1916 | 83 | 54 | T | Sprinkles fell from 8:45am to 9am. |
| 5/12/1917 | 60 | 40 | 0 | |
| 5/11/1918 | 68 | 49 | 2.31" | Thunderstorm. Rain fell from 6:38am to 11:55am, 6:15pm to 10pm, and from 11pm to the end of the day. Northwest winds gusted to 30 mph. |
| 5/10/1919 | 57 | 48 | 0.09" | Rain fell early in the morning, ending at 8am. |
| 5/8/1920 | 72 | 53 | 0 | |
| 5/7/1921 | 73 | 48 | 0 | |
| 5/13/1922 | 77 | 64 | 0 | |
| 5/19/1923 | 85 | 60 | 0 | |
| 5/17/1924 | 74 | 55 | 0 | Southwest winds gusted to 34 mph. |
| 5/16/1925 | 86 | 60 | 0.14" | Thunderstorm with hail and wind gusts to 60 mph. Rain fell intermittently from 8:33am to 9:15am, from about 4:30pm to 5pm, and from 7:30pm to 9pm. Heavy rain and hail fell from 4:52pm to 4:54pm. |
| 5/15/1926 | 64 | 46 | T | Sprinkles fell from 12:25pm to 12:45pm. |
| 5/14/1927 | 64 | 49 | 0.35" | Thunderstorm with west winds gusting to 45 mph. Rain fell intermittently from 2pm to 6pm and from 9pm to 10pm. |
| 5/19/1928 | 75 | 61 | 0.62" | Thunderstorm. Rain fell from 1:30pm to 5:30pm. |
| 5/18/1929 | 77 | 54 | 1.19" | Thunderstorm. Rain fell from 7:35am to 8:45am, 9:55am to 11:15am, 1:40pm to 1:50pm, and from 3:50pm through the evening. |
| 5/17/1930 | 69 | 59 | 0.11" | Rain fell from 12:45pm to 1:10pm, 3:35pm to 3:45pm, and 4:20pm to 6:50pm. |
| 5/16/1931 | 84 | 61 | 0 | |
| 5/7/1932 | 83 | 68 | 0 | |
| 5/6/1933 | 59 | 53 | 0.09" | Rain fell early, ending by 3:30am. |
| 5/5/1934 | 76 | 65 | 0.04" | Rain fell from 6:20am to 6:30am, 6:45am to 6:55am, and 10:43am to 11:50am. |
| 5/4/1935 | 47 | 40 | 0.14" | Rain fell from 8am to 10:15am, 11:40am to 1pm, and 3:30pm to 7:17pm. West winds gusted to 40mph. |
| 5/2/1936 | 78 | 64 | 0.34" | Thunderstorm. Rain fell from 4:35am to 5:30am and 9:20am to 9:30am. |
| 5/8/1937 | 71 | 48 | 0 | |
| 5/7/1938 | 80 | 57 | 0 | |
| 5/6/1939 | 83 | 56 | 0 | |
| 5/4/1940 | 62 | 36 | 0 | |
| 5/3/1941 | 76 | 54 | 0 | |
| 5/2/1942 | 87 | 67 | 0 | |
| 5/1/1943 | 58 | 39 | 0 | |
| 5/6/1944 | 51 | 40 | 0 | |
| 6/9/1945 | 77 | 63 | 0.50" | Rain began at 3:26pm and continued into the evening. |
| 5/4/1946 | 68 | 45 | 0.01" | A few showers moved through around 4:30pm. |
| 5/3/1947 | 57 | 47 | 0.02" | Showers were in the area around sunrise. |
| 5/1/1948 | 72 | 51 | 0.80" | Rain fell around 4:30pm, 5:30pm, 7pm, and as thunderstorms came in just before midnight. |
| 5/7/1949 | 75 | 57 | 0 | |
| 5/6/1950 | 70 | 51 | 0.11" | thunderstorm |
| 5/5/1951 | 67 | 51 | 0.02" | |
| 5/3/1952 | 79 | 55 | 0 | |
| 5/2/1953 | 76 | 55 | 0 | |
| 5/1/1954 | 84 | 66 | 0.15" | thunderstorm |
| 5/7/1955 | 85 | 57 | 0.01" | A thunderstorm grazed the area from 3:40pm to 5pm, with a few sprinkles after that. |
| 5/5/1956 | 82 | 48 | 0 | |
| 5/4/1957 | 47 | 36 | 0 | north winds up to 25mph |
| 5/3/1958 | 86 | 64 | 0.11" | Rain fell from 3:03am to 5:42am and from 5:50am to 6:57am. |
| 5/2/1959 | 94 | 58 | 0 | |
| 5/7/1960 | 64 | 40 | 0.20" | Rain fell until 1:25am. A cold front passed through at 2:14am. Rain fell again from 2:05am to 4:26am. |
| 5/6/1961 | 81 | 52 | 0.25" | Showers were in the area from 4am to 9:30am. Showers and thunderstorms moved through from 7:20pm to the end of the day. |
| 5/5/1962 | 81 | 47 | 0 | |
| 5/4/1963 | 80 | 49 | 0 | |
| 5/2/1964 | 76 | 49 | 0 | |
| 5/1/1965 | 84 | 60 | 0 | |
| 5/7/1966 | 80 | 46 | 0 | |
| 5/6/1967 | 63 | 57 | 0.78" | It rained for nearly the entire day, including a continuous rain from 9:03am to midnight. Thunderstorms with heavy rain moved through around 11pm. |
| 5/4/1968 | 72 | 56 | 0 | |
| 5/3/1969 | 81 | 53 | 0 | |
| 5/2/1970 | 64 | 48 | 0.28" | Rain fell from midnight until 10:40am. |
| 5/1/1971 | 73 | 37 | 0.01" | There was a little light rain around midnight that night. |
| 5/6/1972 | 81 | 51 | 0 | |
| 5/5/1973 | 67 | 39 | 0 | |
| 5/4/1974 | 66 | 44 | 0 | |
| 5/3/1975 | 72 | 56 | 0.23" | Light rain fell from 8:53am to 9:05am, 10:40am to 10:44am, 11:20am to 12:15pm, and 6:06pm to 7:05pm. |
| 5/1/1976 | 73 | 52 | 0.01" | Light rain fell from 6:20pm to 8:15pm. |
| 5/7/1977 | 77 | 61 | 0.03" | Light rain fell from 1:25am to 3:30am, 4:40am to 5:10am, and 10:40am to 1:30pm. |
| 5/6/1978 | 67 | 43 | 0 | |
| 5/5/1979 | 65 | 39 | 0 | |
| 5/3/1980 | 75 | 54 | 0 | |
| 5/2/1981 | 68 | 45 | 0 | |
| 5/1/1982 | 75 | 55 | T | Sprinkles fell from 9:35am to 9:59am. |
| 5/7/1983 | 81 | 58 | 0.54" | Showers and thunderstorms moved through the city from 5pm to midnight. The thunder was from 5pm to 6:30pm and 10:15pm to 11:15pm. |
| 5/5/1984 | 71 | 46 | 0.09" | Light rain fell intermittently from 5:22pm to midnight. |
| 5/4/1985 | 74 | 46 | 0 | |
| 5/3/1986 | 63 | 40 | 0 | |
| 5/2/1987 | 87 | 61 | 0 | |
| 5/7/1988 | 81 | 50 | 0 | Thunderstorms developed southwest of Louisville and headed northeast, but dissipated before getting here. |
| 5/6/1989 | 51 | 39 | 0.09" | Sleet fell from 1:01pm to 1:05pm. Also, rain fell off and on for the entire day. |
| 5/5/1990 | 63 | 48 | T | Drizzle and sprinkles fell intermittently from 8:22am to 4:39pm. |
| 5/4/1991 | 80 | 64 | 0.06" | Thunderstorm from 5:56pm to 6:32pm. |
| 5/2/1992 | 81 | 65 | 0.83" | Thunderstorms with heavy rain, bringing visibility down to half a mile, moved across the area from 7pm to 9pm. A cold front crossed Louisville at 7:55pm. |
| 5/1/1993 | 76 | 57 | 0.02" | Showers were in the area 2:46pm to 6:45pm. |
| 5/7/1994 | 70 | 50 | 0.63" | Rain and fog were reported from midnight to 5am. Showers and thunderstorms moved through from 2pm to 4:30pm. |
| 5/6/1995 | 74 | 46 | 0 | |
| 5/5/1996 | 81 | 58 | 0.46" | A widespread severe storm outbreak occurred, with many Tornado Warnings, Severe Thunderstorm Warnings, and Flash Flood Warnings issued by the Louisville NWS office. Thunderstorms with frequent lightning crossed the city from 3:20pm to 7:15pm. The heaviest rain hit around 6:30pm. A Severe Thunderstorm Warning was issued for Jefferson County at 4:07pm. |
| 5/3/1997 | 60 | 47 | 0.22" | Thunderstorms hit very early, ending by 1:30am. However, there were still a few showers around in the afternoon and evening. Winds were gusty, peaking at 35mph shortly after 1pm. |
| 5/2/1998 | 75 | 49 | 0.03" | Thunderstorms were in the area from 9pm to 10:45pm. |
| 5/1/1999 | 75 | 46 | 0 | |
| 5/6/2000 | 86 | 63 | T | There were a few thunderstorms in the area from 4pm to 6pm. |
| 5/5/2001 | 86 | 58 | 0 | |
| 5/4/2002 | 71 | 49 | 0 | |
| 5/3/2003 | 65 | 52 | 0 | |
| 5/1/2004 | 75 | 53 | 0.46" | Showers and thunderstorms were over the city from 6am to 9am, around noon, and from 5pm to the end of the day. |
| 5/7/2005 | 80 | 48 | 0 | |
| 5/6/2006 | 68 | 52 | 0 | |
| 5/5/2007 | 78 | 62 | T | Sprinkles fell at Louisville International Airport from 4:19 am to 4:51am and from 2:54pm to 3:11pm. At Derby race time a shower was located just seven miles east of the track but it never affected Churchill Downs. |
| 5/3/2008 | 75 | 50 | 0.69" | The rain ended by 8am, with plenty of sunshine breaking out by race time with brisk west winds. At 6pm the temperature was 67 degrees with west winds of 25 mph and 45% relative humidity. |
| 5/2/2009 | 62 | 51 | 0.07" | The light rain that fell ended at 8:01am. At 6pm the temperature was 62 degrees with cloudy skies and a calm wind. |