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Jeffersontown, Kentucky climate
Cfa Humid subtropical
Jeffersontown has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 31°C, while the coldest is January averaging around −3°C at night. Precipitation is fairly even year-round, totalling about 1222 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsJeffersontown climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 9 | 14 | 20 | 25 | 29 | 31 | 31 | 27 | 21 | 14 | 8 |
| Avg temp (°C) | 2 | 4 | 9 | 15 | 20 | 24 | 26 | 25 | 21 | 15 | 8 | 4 |
| Avg low (°C) | −3 | −1 | 3 | 9 | 14 | 19 | 21 | 20 | 16 | 9 | 3 | 0 |
| Precipitation (mm) | 83 | 83 | 111 | 119 | 131 | 119 | 116 | 90 | 92 | 93 | 87 | 99 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 9 | 14 | 20 | 25 | 29 |
| Avg temp (°C) | 2 | 4 | 9 | 15 | 20 | 24 |
| Avg low (°C) | −3 | −1 | 3 | 9 | 14 | 19 |
| Precipitation (mm) | 83 | 83 | 111 | 119 | 131 | 119 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 31 | 27 | 21 | 14 | 8 |
| Avg temp (°C) | 26 | 25 | 21 | 15 | 8 | 4 |
| Avg low (°C) | 21 | 20 | 16 | 9 | 3 | 0 |
| Precipitation (mm) | 116 | 90 | 92 | 93 | 87 | 99 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 10 | 11 | 11 | 13 | 11 | 11 | 9 | 9 | 9 | 10 | 12 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.9 | 7 | 13 | 10 | 5 | 0.5 | — | — |
| Days with low ≤ 0°C (days) | 21 | 17 | 9 | 1 | 0.0 | — | — | — | — | 0.9 | 9 | 18 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 10 | 11 | 11 | 13 | 11 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.9 | 7 |
| Days with low ≤ 0°C (days) | 21 | 17 | 9 | 1 | 0.0 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 9 | 9 | 9 | 10 | 12 |
| Days with high ≥ 32°C (days) | 13 | 10 | 5 | 0.5 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 0.9 | 9 | 18 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 72 | 68 | 64 | 65 | 57 | 54 | 50 | 48 | 55 | 62 | 71 |
| Clear days (≤ 30% cloud) | 3 | 3 | 5 | 6 | 5 | 7 | 8 | 10 | 11 | 9 | 7 | 4 |
| Partly cloudy days (30–70%) | 9 | 9 | 9 | 9 | 10 | 12 | 13 | 11 | 10 | 9 | 9 | 9 |
| Cloudy days (≥ 70%) | 19 | 17 | 17 | 15 | 16 | 11 | 11 | 10 | 9 | 13 | 15 | 19 |
| Relative humidity (%) | 86 | 84 | 82 | 79 | 80 | 79 | 76 | 69 | 66 | 71 | 78 | 85 |
| Wind speed (m/s) | 2.5 | 2.5 | 2.5 | 2.3 | 1.9 | 1.6 | 1.4 | 1.4 | 1.6 | 1.8 | 2.0 | 2.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 72 | 68 | 64 | 65 | 57 |
| Clear days (≤ 30% cloud) | 3 | 3 | 5 | 6 | 5 | 7 |
| Partly cloudy days (30–70%) | 9 | 9 | 9 | 9 | 10 | 12 |
| Cloudy days (≥ 70%) | 19 | 17 | 17 | 15 | 16 | 11 |
| Relative humidity (%) | 86 | 84 | 82 | 79 | 80 | 79 |
| Wind speed (m/s) | 2.5 | 2.5 | 2.5 | 2.3 | 1.9 | 1.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 54 | 50 | 48 | 55 | 62 | 71 |
| Clear days (≤ 30% cloud) | 8 | 10 | 11 | 9 | 7 | 4 |
| Partly cloudy days (30–70%) | 13 | 11 | 10 | 9 | 9 | 9 |
| Cloudy days (≥ 70%) | 11 | 10 | 9 | 13 | 15 | 19 |
| Relative humidity (%) | 76 | 69 | 66 | 71 | 78 | 85 |
| Wind speed (m/s) | 1.4 | 1.4 | 1.6 | 1.8 | 2.0 | 2.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Louisville Bowman Fld (NOAA GHCN station USW00013810), about 10 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.