Fact Sheet - Louisville - Springdale, 157 Years of Climate
Jefferson County, Kentucky is fortunate to have two climate stations with long records. These stations, Louisville and Springdale, are both within the metropolitan area. Best of all, the Louisville record began the month after the Springdale record ended (December, 1872). When combined, the record extends from 1841 through 1997 missing only 20 temperature and 23 precipitation months of the 1,884 months during the period. Although the stations are technically incompatible, it is instructive to view them together on a single graph.
The blue line on the graph above shows the annual precipitation of the combined Louisville-Springdale stations. It resembles the national graph with the drought years of 1856, 1901, and 1930 clearly visible. The long term mean of 44.05 inches is shown as a horizontal green line. The standard deviation was 7.78 inches. The wettest year was 1850 with 67.10 inches and the driest was 1930 with 23.88 inches.
The red line on the graph above is the mean annual temperature of the combined Louisville-Springdale stations. The hottest years of 1881, 1921, 1990, and 1991 are visible. The long term mean of 56.43F is shown as the horizontal green line. The standard deviation was 1.44F. The hottest year was 1921 with 60.07F and the coldest was 1857 with 52.18F.