Weather on December 21
Knoxville, TN
55 Years of Data
Avg High
48°F
Avg Low
28°F
Warmest
1984
58°F avg
Coldest
2004
15°F avg
About This Date
December 21st in Knoxville, TN typically brings chilly winter weather, with average highs around 48°F and lows near 28°F. Over 55 years of records, the warmest December 21st was in 1984 (58°F average), while the coldest was 2004 (15°F) — a 43°F range across recorded history. Rain or other precipitation has occurred on about 40% of December 21st dates historically, with the wettest December 21st recording 3.99" of rain. The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Knoxville, TN? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Cooling Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 55° | 22° | 38° | 0.03" | — |
| 2024 | 43° | 34° | 38° | — | — |
| 2023 | 47° | 24° | 35° | — | — |
| 2022 | 50° | 20° | 35° | — | — |
| 2021 | 50° | 30° | 40° | — | — |
| 2020 | 48° | 25° | 36° | — | — |
| 2019 | 51° | 25° | 38° | — | — |
| 2018 | 49° | 40° | 44° | 2.51" | — |
| 2017 | 60° | 35° | 48° | 3.99" | — |
| 2016 | 40° | 25° | 32° | — | — |
| 2015 | 56° | 26° | 41° | — | — |
| 2014 | 52° | 33° | 42° | — | — |
| 2013 | 58° | 26° | 42° | — | — |
| 2012 | 53° | 33° | 43° | 2.57" | — |
| 2011 | 55° | 42° | 49° | 0.23" | — |
| 2010 | 42° | 18° | 30° | — | — |
| 2009 | 37° | 28° | 33° | 0.1" | — |
| 2008 | 58° | 38° | 48° | 2.67" | — |
| 2007 | 50° | 34° | 42° | 1.37" | — |
| 2006 | 59° | 37° | 48° | — | — |
| 2005 | 39° | 14° | 27° | — | — |
| 2004coldest | 24° | 6° | 15° | — | — |
| 2003 | 36° | 17° | 26° | — | — |
| 2002 | 52° | 37° | 44° | 0.08" | — |
| 2001 | 47° | 25° | 36° | — | — |
| 2000 | 30° | 13° | 21° | — | — |
| 1999 | 59° | 34° | 46° | 0.2" | — |
| 1998 | 53° | 42° | 48° | — | — |
| 1997 | 63° | 30° | 46° | — | — |
| 1996 | 30° | 11° | 20° | — | — |
| 1995 | 36° | 17° | 26° | — | — |
| 1994 | 52° | 24° | 38° | — | — |
| 1993 | 38° | 30° | 34° | 1.93" | — |
| 1992 | 54° | 28° | 41° | 0.18" | — |
| 1991 | 46° | 25° | 35° | 0.08" | — |
| 1990 | 51° | 38° | 44° | 0.81" | — |
| 1989 | 32° | 15° | 24° | — | — |
| 1988 | 63° | 46° | 54° | — | — |
| 1987 | 50° | 40° | 45° | — | — |
| 1986 | 55° | 24° | 40° | — | — |
| 1985 | 31° | 15° | 23° | — | — |
| 1984warmest | 62° | 53° | 58° | 1.17" | — |
| 1983 | 40° | 31° | 35° | 0.03" | — |
| 1982 | 45° | 22° | 33° | — | — |
| 1981 | 35° | 18° | 26° | 0.13" | — |
| 1980 | 33° | 17° | 25° | — | — |
| 1979 | 57° | 33° | 45° | — | — |
| 1978 | 69° | 40° | 54° | 1.3" | — |
| 1977 | 48° | 31° | 39° | — | — |
| 1976 | 52° | 17° | 34° | 0.36" | — |
| 1975 | 46° | 23° | 35° | — | — |
| 1974 | 45° | 38° | 41° | — | — |
| 1973 | 46° | 24° | 35° | 1.3" | — |
| 1972 | 58° | 47° | 52° | 1.45" | — |
| 1971 | 57° | 46° | 52° | 0.13" | — |
55 years of data from KNOXVILLE UNIV OF TENN