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Rock Hill, South Carolina climate

Cfa Humid subtropical

Rock Hill has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 91°F, while the coldest is January averaging around 33°F at night. Precipitation is fairly even year-round, totalling about 43 inches.

☀️ Summers

Hot

Highs near 91°F in July.

About 55 days a year above 90 °F

❄️ Winters

Chilly

Lows near 33°F in January.

About 51 freezing nights a year

🌧️ Rain

Wet

About 43 in of rain a year.

Wettest in June

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.6 °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

Rock Hill climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	54	58	66	75	81	88	91	89	84	74	64	56
Avg temp (°F)	43	46	54	62	70	77	80	79	73	63	52	45
Avg low (°F)	33	35	42	50	59	67	70	69	63	51	41	35
Precipitation (in)	3.6	3.1	3.9	3.7	3.5	4.1	3.6	3.7	3.6	2.9	3.3	3.6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	54	58	66	75	81	88
Avg temp (°F)	43	46	54	62	70	77
Avg low (°F)	33	35	42	50	59	67
Precipitation (in)	3.6	3.1	3.9	3.7	3.5	4.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	91	89	84	74	64	56
Avg temp (°F)	80	79	73	63	52	45
Avg low (°F)	70	69	63	51	41	35
Precipitation (in)	3.6	3.7	3.6	2.9	3.3	3.6

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	10	9	10	9	8	9	9	9	7	7	8	9
Days with high ≥ 90°F (days)	—	—	—	0.2	3	12	20	15	5	0.3	—	—
Days with low ≤ 32°F (days)	15	11	6	0.4	—	—	—	—	—	0.5	6	12
Days with snowfall ≥ 1 in (days)	0.4	0.3	0.0	—	—	—	—	—	—	—	0.0	0.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	10	9	10	9	8	9
Days with high ≥ 90°F (days)	—	—	—	0.2	3	12
Days with low ≤ 32°F (days)	15	11	6	0.4	—	—
Days with snowfall ≥ 1 in (days)	0.4	0.3	0.0	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	9	9	7	7	8	9
Days with high ≥ 90°F (days)	20	15	5	0.3	—	—
Days with low ≤ 32°F (days)	—	—	—	0.5	6	12
Days with snowfall ≥ 1 in (days)	—	—	—	—	0.0	0.1

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	56	59	57	54	55	56	58	57	50	45	49	56
Clear days (≤ 30% cloud)	9	7	8	9	8	7	6	7	11	13	11	9
Partly cloudy days (30–70%)	9	10	10	10	11	13	14	13	9	8	9	9
Cloudy days (≥ 70%)	13	12	13	11	12	10	11	12	10	10	10	13
Relative humidity (%)	81	80	79	76	74	71	68	69	70	72	74	80
Wind speed (mph)	2.3	2.5	2.6	2.6	2.3	2.0	1.9	1.9	2.2	2.2	2.2	2.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	56	59	57	54	55	56
Clear days (≤ 30% cloud)	9	7	8	9	8	7
Partly cloudy days (30–70%)	9	10	10	10	11	13
Cloudy days (≥ 70%)	13	12	13	11	12	10
Relative humidity (%)	81	80	79	76	74	71
Wind speed (mph)	2.3	2.5	2.6	2.6	2.3	2.0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	58	57	50	45	49	56
Clear days (≤ 30% cloud)	6	7	11	13	11	9
Partly cloudy days (30–70%)	14	13	9	8	9	9
Cloudy days (≥ 70%)	11	12	10	10	10	13
Relative humidity (%)	68	69	70	72	74	80
Wind speed (mph)	1.9	1.9	2.2	2.2	2.2	2.2

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Winthrop Univ (NOAA GHCN station USC00389350), about 2 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 →