Climate averages 1991–2020
Rock Hill weather
in December.
A cool, wet month: the 11th warmest and the joint 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in Rock Hill: daytime highs average 11.9°C and nights cool to about 3.1°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 96 mm of rain on roughly 9 days, which makes December a wet month (the joint 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 52 min on an average December day.
The nearest other city in this atlas is Charlotte (37 km away). In December its highs average 11.2°C, 0.7°C cooler than Rock Hill, with 93 mm of rain.
Among the 498 cities listed in the United States, Rock Hill ranks joint 234th of 498 for the warmest December highs and joint 360th of 498 for the driest December (rainfall, lowest first). The mean December high of those 498 cities is 10.5°C; Rock Hill is 1.3°C warmer than that mean.
From December to January, average highs fall by 1.3°C to 10.5°C, and monthly rainfall falls from 96 mm to 95 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Rock Hill climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 10.5°C1.5°C | 1.5°C | 95 | 9.5 | 10.110 h |
| February | 12.6°C2.9°C | 2.9°C | 87 | 8.8 | 10.911 h |
| March | 16.7°C6.2°C | 6.2°C | 107 | 9.9 | 11.912 h |
| April | 21.8°C10.8°C | 10.8°C | 89 | 8.7 | 13.013 h |
| May | 26.2°C15.7°C | 15.7°C | 73 | 9.6 | 14.014 h |
| June | 29.8°C20.1°C | 20.1°C | 96 | 11.8 | 14.514 h |
| July | 31.6°C22.1°C | 22.1°C | 93 | 13.5 | 14.314 h |
| August | 30.4°C21.4°C | 21.4°C | 102 | 11.5 | 13.513 h |
| September | 27.4°C18.4°C | 18.4°C | 93 | 8.4 | 12.412 h |
| October | 22.0°C12.4°C | 12.4°C | 83 | 6.9 | 11.311 h |
| November | 16.2°C6.7°C | 6.7°C | 80 | 7.5 | 10.410 h |
| December, selected | 11.9°C3.1°C | 3.1°C | 96 | 9.1 | 9.910 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Charlotte in DecemberUnited States · 37 kmHigh 11.2°C · Low 2.1°C · 93 mm rain
- Gastonia in DecemberUnited States · 40 kmHigh 11.0°C · Low 2.5°C · 101 mm rain
- Concord (North Carolina), United States in DecemberUnited States · 67 kmHigh 11.2°C · Low 2.5°C · 94 mm rain
- Columbia (South Carolina), United States in DecemberUnited States · 103 kmHigh 13.6°C · Low 4.2°C · 93 mm rain
- High Point in DecemberUnited States · 147 kmHigh 10.1°C · Low 1.3°C · 94 mm rain
- Winston-Salem in DecemberUnited States · 149 kmHigh 10.0°C · Low 1.0°C · 93 mm rain
- Asheville in DecemberUnited States · 158 kmHigh 8.6°C · Low -0.7°C · 89 mm rain
- Greensboro in DecemberUnited States · 170 kmHigh 10.1°C · Low 1.3°C · 91 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Rock Hill) is explained once on the Rock Hill year overview and on the Sources, method and limits page.