Weather on December 21
Sioux Falls, SD
55 Years of Data
Avg High
28°F
Avg Low
10°F
Warmest
2023
38°F avg
Coldest
1989
-20°F avg
About This Date
December 21st in Sioux Falls, SD typically brings very cold winter weather, with average highs around 28°F and lows near 10°F. Over 55 years of records, the warmest December 21st was in 2023 (38°F average), while the coldest was 1989 (-20°F) — a 58°F range across recorded history. Precipitation has occurred on 16% of recorded December 21st dates, with snow falling 16% of the time (heaviest snowfall: 4.3"). The last decade has been 10.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 10.4°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Sioux Falls, SD? Bundle up with warm layers and protect extremities from the cold.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 44° | 10° | 27° | — | — |
| 2024 | 32° | 8° | 20° | — | — |
| 2023warmest | 49° | 27° | 38° | — | — |
| 2022 | 4° | -8° | -2° | 0.38" | 2" |
| 2021 | 34° | 14° | 24° | — | — |
| 2020 | 45° | 22° | 34° | — | — |
| 2019 | 45° | 15° | 30° | — | — |
| 2018 | 30° | 21° | 26° | — | — |
| 2017 | 32° | 12° | 22° | 0.79" | 4.3" |
| 2016 | 41° | 23° | 32° | — | — |
| 2015 | 24° | 21° | 23° | — | — |
| 2014 | 40° | 30° | 35° | — | — |
| 2013 | 17° | 1° | 9° | — | — |
| 2012 | 25° | -2° | 11° | — | — |
| 2011 | 40° | 14° | 27° | — | — |
| 2010 | 32° | 7° | 19° | — | — |
| 2009 | 26° | 21° | 24° | 0.51" | 2" |
| 2008 | 0° | -8° | -4° | — | — |
| 2007 | 36° | 31° | 33° | — | — |
| 2006 | 34° | 32° | 33° | 1.47" | — |
| 2005 | 30° | 0° | 15° | — | — |
| 2004 | 20° | 2° | 11° | — | — |
| 2003 | 43° | 21° | 32° | — | — |
| 2002 | 27° | 22° | 24° | — | — |
| 2001 | 42° | 18° | 30° | — | — |
| 2000 | 4° | -9° | -3° | — | — |
| 1999 | 12° | -12° | 0° | 0.05" | 1" |
| 1998 | 3° | -5° | -1° | — | 0.1" |
| 1997 | 30° | 18° | 24° | — | — |
| 1996 | 29° | 1° | 15° | 0.05" | 1" |
| 1995 | 24° | 15° | 20° | — | — |
| 1994 | 32° | 25° | 28° | — | — |
| 1993 | 31° | 8° | 19° | 0.13" | 0.6" |
| 1992 | 35° | 10° | 23° | — | — |
| 1991 | 45° | 18° | 31° | — | — |
| 1990 | -10° | -20° | -15° | 0.05" | 0.7" |
| 1989coldest | -16° | -25° | -20° | — | — |
| 1988 | 38° | 16° | 27° | — | — |
| 1987 | 35° | 18° | 26° | — | — |
| 1986 | 37° | 6° | 22° | — | — |
| 1985 | 34° | 0° | 17° | — | — |
| 1984 | 37° | 9° | 23° | — | — |
| 1983 | -4° | -23° | -13° | 0.05" | 0.3" |
| 1982 | 46° | 25° | 35° | — | — |
| 1981 | 39° | 18° | 28° | — | — |
| 1980 | 24° | 11° | 17° | — | — |
| 1979 | 48° | 26° | 37° | — | — |
| 1978 | 36° | 15° | 25° | — | — |
| 1977 | 19° | 2° | 10° | — | — |
| 1976 | 33° | -3° | 15° | — | — |
| 1975 | 31° | 10° | 20° | — | — |
| 1974 | 23° | 5° | 14° | — | — |
| 1973 | 26° | 10° | 18° | — | — |
| 1972 | 26° | 20° | 23° | — | — |
| 1971 | 25° | 12° | 18° | — | — |
55 years of data from SIOUX FALLS