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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 88°F, while the coldest is January averaging around 27°F at night. Precipitation is fairly even year-round, totalling about 48 inches.

☀️ Summers

Hot

Highs near 88°F in July.

About 37 days a year above 90 °F

❄️ Winters

Cold

Lows near 27°F in January.

About 77 freezing nights a year

🌧️ Rain

Wet

About 48 in of rain a year.

Wettest in May

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+5.0 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Jeffersontown climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	43	48	57	69	77	85	88	87	81	69	57	46
Avg temp (°F)	35	39	47	58	67	75	79	78	70	59	47	39
Avg low (°F)	27	30	38	48	57	66	69	68	60	48	38	31
Precipitation (in)	3.3	3.3	4.4	4.7	5.2	4.7	4.6	3.5	3.6	3.7	3.4	3.9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	43	48	57	69	77	85
Avg temp (°F)	35	39	47	58	67	75
Avg low (°F)	27	30	38	48	57	66
Precipitation (in)	3.3	3.3	4.4	4.7	5.2	4.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	88	87	81	69	57	46
Avg temp (°F)	79	78	70	59	47	39
Avg low (°F)	69	68	60	48	38	31
Precipitation (in)	4.6	3.5	3.6	3.7	3.4	3.9

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 ≥ 90°F (days)	—	—	—	—	0.9	7	13	10	5	0.5	—	—
Days with low ≤ 32°F (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 ≥ 90°F (days)	—	—	—	—	0.9	7
Days with low ≤ 32°F (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 ≥ 90°F (days)	13	10	5	0.5	—	—
Days with low ≤ 32°F (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 (mph)	5.6	5.6	5.5	5.2	4.2	3.5	3.1	3.1	3.5	4.0	4.5	4.8

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 (mph)	5.6	5.6	5.5	5.2	4.2	3.5

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 (mph)	3.1	3.1	3.5	4.0	4.5	4.8

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.

How we build these numbers →