Template:Louisville, Kentucky weatherbox
| Climate data for Louisville International Airport, Kentucky (1991–2020 normals,[a] extremes 1872–present[b]) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 77 (25) |
82 (28) |
88 (31) |
91 (33) |
98 (37) |
105 (41) |
107 (42) |
105 (41) |
104 (40) |
97 (36) |
85 (29) |
76 (24) |
107 (42) |
| Mean maximum °F (°C) | 65.2 (18.4) |
70.4 (21.3) |
77.8 (25.4) |
84.1 (28.9) |
89.0 (31.7) |
93.6 (34.2) |
95.7 (35.4) |
95.6 (35.3) |
92.9 (33.8) |
85.4 (29.7) |
75.1 (23.9) |
67.0 (19.4) |
97.3 (36.3) |
| Mean daily maximum °F (°C) | 43.6 (6.4) |
48.3 (9.1) |
58.1 (14.5) |
69.6 (20.9) |
77.8 (25.4) |
85.7 (29.8) |
89.0 (31.7) |
88.4 (31.3) |
82.2 (27.9) |
70.5 (21.4) |
57.6 (14.2) |
47.2 (8.4) |
68.2 (20.1) |
| Daily mean °F (°C) | 35.7 (2.1) |
39.5 (4.2) |
48.4 (9.1) |
59.0 (15.0) |
68.3 (20.2) |
76.4 (24.7) |
79.9 (26.6) |
78.9 (26.1) |
72.0 (22.2) |
60.3 (15.7) |
48.5 (9.2) |
39.6 (4.2) |
58.9 (14.9) |
| Mean daily minimum °F (°C) | 27.8 (−2.3) |
30.7 (−0.7) |
38.6 (3.7) |
48.5 (9.2) |
58.7 (14.8) |
67.2 (19.6) |
70.8 (21.6) |
69.5 (20.8) |
61.9 (16.6) |
50.1 (10.1) |
39.4 (4.1) |
32.1 (0.1) |
49.6 (9.8) |
| Mean minimum °F (°C) | 6.0 (−14.4) |
11.4 (−11.4) |
20.3 (−6.5) |
31.7 (−0.2) |
41.9 (5.5) |
53.6 (12.0) |
60.5 (15.8) |
58.7 (14.8) |
46.9 (8.3) |
33.7 (0.9) |
23.1 (−4.9) |
13.0 (−10.6) |
3.3 (−15.9) |
| Record low °F (°C) | −22 (−30) |
−19 (−28) |
−1 (−18) |
21 (−6) |
31 (−1) |
42 (6) |
49 (9) |
45 (7) |
33 (1) |
23 (−5) |
−1 (−18) |
−15 (−26) |
−22 (−30) |
| Average precipitation inches (mm) | 3.39 (86) |
3.41 (87) |
4.60 (117) |
4.80 (122) |
5.18 (132) |
4.27 (108) |
4.05 (103) |
3.71 (94) |
3.66 (93) |
3.72 (94) |
3.42 (87) |
4.13 (105) |
48.34 (1,228) |
| Average snowfall inches (cm) | 4.5 (11) |
4.1 (10) |
2.1 (5.3) |
0.1 (0.25) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.1 (0.25) |
0.3 (0.76) |
2.2 (5.6) |
13.4 (34) |
| Average precipitation days (≥ 0.01 in) | 11.2 | 10.4 | 12.1 | 11.9 | 12.6 | 10.5 | 10.2 | 8.2 | 7.9 | 7.9 | 9.8 | 11.8 | 124.5 |
| Average snowy days (≥ 0.1 in) | 3.7 | 3.7 | 1.7 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.6 | 2.5 | 12.3 |
| Average relative humidity (%) | 68.6 | 68.1 | 64.0 | 61.5 | 67.2 | 68.9 | 70.9 | 71.7 | 72.9 | 69.9 | 69.4 | 70.2 | 68.6 |
| Mean monthly sunshine hours | 140.5 | 148.9 | 188.6 | 221.1 | 263.4 | 288.9 | 293.6 | 272.6 | 234.3 | 208.5 | 135.7 | 118.3 | 2,514.4 |
| Percent possible sunshine | 46 | 49 | 51 | 56 | 60 | 65 | 65 | 65 | 63 | 60 | 45 | 40 | 56 |
| Average ultraviolet index | 1.8 | 2.8 | 4.6 | 6.5 | 8.0 | 8.9 | 9.1 | 8.2 | 6.4 | 4.0 | 2.3 | 1.6 | 5.3 |
| Source 1: NOAA (relative humidity and sun 1961–1990)[1][2][3] | |||||||||||||
| Source 2: UV Index Today (1995 to 2022)[4] | |||||||||||||
- ^ Mean monthly maxima and minima (i.e. the expected highest and lowest temperature readings at any point during the year or given month) calculated based on data at said location from 1991 to 2020.
- ^ Official records for Louisville were kept at the Weather Bureau Office from August 1872 to June 1945, Bowman Field from July 1945 to November 1947, Louisville Int'l from December 1947 to October 1995, the Weather Forecast Office (38°06′54″N 85°38′42″W / 38.1150°N 85.6450°W) from November 1995 to December 2005, and again at Louisville Int'l since January 2006. For more information, see Threadex
- ^ "Station Name: KY Louisville Intl. AP". U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991–2020). National Oceanic and Atmospheric Administration. Retrieved June 2, 2021.
- ^ "NowData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved June 2, 2021.
- ^ "WMO Climate Normals for Louisville/Standiford Field KY 1961–1990". National Oceanic and Atmospheric Administration. Retrieved March 11, 2014.
- ^ "Historical UV Index Data - Louisdville, KY". UV Index Today. Retrieved April 21, 2023.