| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 11.9° | 0.7° | 95.1mm | 9.9 | 52 |
| February | 14.7° | 2.1° | 79.9mm | 9.5 | 64 |
| March | 18.8° | 5.8° | 89.8mm | 9.8 | 77 |
| April | 23.8° | 10.2° | 97.8mm | 8.4 | 83 |
| May | 27.5° | 15° | 88.8mm | 8.3 | 81 |
| June | 31° | 19.4° | 99.3mm | 9.2 | 66 |
| July | 32.7° | 21.3° | 102.5mm | 9.3 | 59 |
| August | 31.9° | 20.8° | 96.8mm | 8.8 | 63 |
| September | 28.9° | 17.4° | 95.4mm | 6.6 | 79 |
| October | 23.6° | 11° | 68.9mm | 6.6 | 87 |
| November | 17.5° | 5.1° | 82.9mm | 7.8 | 76 |
| December | 13.2° | 2.1° | 96.5mm | 9.1 | 60 |
January in Rock Hill averages a daily high of 11.9°C with nights around 0.7°C. Expect roughly 9.9 wet days totalling 95.1mm. Demanding conditions — pack for it and plan indoor options.
February in Rock Hill averages a daily high of 14.7°C with nights around 2.1°C. Expect roughly 9.5 wet days totalling 79.9mm. Generally workable, with some weather to plan around.
March in Rock Hill averages a daily high of 18.8°C with nights around 5.8°C. Expect roughly 9.8 wet days totalling 89.8mm. Comfortable conditions for being outdoors all day.
April in Rock Hill averages a daily high of 23.8°C with nights around 10.2°C. Expect roughly 8.4 wet days totalling 97.8mm. Comfortable conditions for being outdoors all day.
May in Rock Hill averages a daily high of 27.5°C with nights around 15°C. Expect roughly 8.3 wet days totalling 88.8mm. Comfortable conditions for being outdoors all day.
June in Rock Hill averages a daily high of 31°C with nights around 19.4°C. Expect roughly 9.2 wet days totalling 99.3mm. Generally workable, with some weather to plan around.
July in Rock Hill averages a daily high of 32.7°C with nights around 21.3°C. Expect roughly 9.3 wet days totalling 102.5mm. Generally workable, with some weather to plan around.
August in Rock Hill averages a daily high of 31.9°C with nights around 20.8°C. Expect roughly 8.8 wet days totalling 96.8mm. Generally workable, with some weather to plan around.
September in Rock Hill averages a daily high of 28.9°C with nights around 17.4°C. Expect roughly 6.6 wet days totalling 95.4mm. Comfortable conditions for being outdoors all day.
October in Rock Hill averages a daily high of 23.6°C with nights around 11°C. Expect roughly 6.6 wet days totalling 68.9mm. Comfortable conditions for being outdoors all day.
November in Rock Hill averages a daily high of 17.5°C with nights around 5.1°C. Expect roughly 7.8 wet days totalling 82.9mm. Comfortable conditions for being outdoors all day.
December in Rock Hill averages a daily high of 13.2°C with nights around 2.1°C. Expect roughly 9.1 wet days totalling 96.5mm. Generally workable, with some weather to plan around.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Rock Hill peaks at 87.
Based on 30 years of records, April–May scores highest for comfort in Rock Hill, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 32.7°C.
July is the wettest, averaging 102.5mm of rain across roughly 9.3 wet days.
January is the coolest month, with average daily highs around 11.9°C.