Climate averages 1991–2020
Knoxville weather
in December.
A cool, wet month: the 11th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in Knoxville: daytime highs average 9.9°C and nights cool to about 1.2°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 117 mm of rain on roughly 11 days, which makes December a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 46 min on an average December day.
The nearest other city in this atlas is Asheville (130 km away). In December its highs average 8.6°C, 1.3°C cooler than Knoxville, with 89 mm of rain.
Among the 498 cities listed in the United States, Knoxville ranks joint 264th of 498 for the warmest December highs and joint 451st of 498 for the driest December (rainfall, lowest first). The mean December high of those 498 cities is 10.5°C; Knoxville is 0.7°C cooler than that mean.
From December to January, average highs fall by 1.5°C to 8.3°C, and monthly rainfall falls from 117 mm to 111 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
Knoxville climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.3°C-0.6°C | -0.6°C | 111 | 10.7 | 10.010 h |
| February | 10.6°C0.8°C | 0.8°C | 110 | 10.9 | 10.911 h |
| March | 15.0°C4.2°C | 4.2°C | 123 | 12.2 | 11.912 h |
| April | 20.0°C8.8°C | 8.8°C | 109 | 10.9 | 13.113 h |
| May | 24.1°C13.8°C | 13.8°C | 94 | 11.7 | 14.014 h |
| June | 28.3°C18.3°C | 18.3°C | 93 | 13.2 | 14.615 h |
| July | 29.8°C20.5°C | 20.5°C | 119 | 14.8 | 14.314 h |
| August | 29.4°C19.9°C | 19.9°C | 86 | 11.4 | 13.514 h |
| September | 26.7°C16.8°C | 16.8°C | 90 | 8.3 | 12.412 h |
| October | 20.9°C10.5°C | 10.5°C | 74 | 7.7 | 11.311 h |
| November | 14.6°C4.5°C | 4.5°C | 96 | 8.9 | 10.310 h |
| December, selected | 9.9°C1.2°C | 1.2°C | 117 | 10.6 | 9.810 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
- Asheville in DecemberUnited States · 130 kmHigh 8.6°C · Low -0.7°C · 89 mm rain
- East Chattanooga in DecemberUnited States · 156 kmHigh 10.6°C · Low 2.1°C · 128 mm rain
- Chattanooga in DecemberUnited States · 162 kmHigh 10.8°C · Low 2.3°C · 128 mm rain
- Johns Creek in DecemberUnited States · 216 kmHigh 11.8°C · Low 3.3°C · 117 mm rain
- Roswell in DecemberUnited States · 219 kmHigh 11.5°C · Low 3.0°C · 117 mm rain
- Murfreesboro in DecemberUnited States · 223 kmHigh 10.0°C · Low 2.1°C · 130 mm rain
- Athens, United States in DecemberUnited States · 228 kmHigh 12.5°C · Low 3.6°C · 113 mm rain
- Sandy Springs in DecemberUnited States · 230 kmHigh 11.6°C · Low 3.1°C · 116 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 Knoxville) is explained once on the Knoxville year overview and on the Sources, method and limits page.