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
YearHighLowAvgPrecipSnow
202544°10°27°
202432°20°
2023warmest49°27°38°
2022-8°-2°0.38"2"
202134°14°24°
202045°22°34°
201945°15°30°
201830°21°26°
201732°12°22°0.79"4.3"
201641°23°32°
201524°21°23°
201440°30°35°
201317°
201225°-2°11°
201140°14°27°
201032°19°
200926°21°24°0.51"2"
2008-8°-4°
200736°31°33°
200634°32°33°1.47"
200530°15°
200420°11°
200343°21°32°
200227°22°24°
200142°18°30°
2000-9°-3°
199912°-12°0.05"1"
1998-5°-1°0.1"
199730°18°24°
199629°15°0.05"1"
199524°15°20°
199432°25°28°
199331°19°0.13"0.6"
199235°10°23°
199145°18°31°
1990-10°-20°-15°0.05"0.7"
1989coldest-16°-25°-20°
198838°16°27°
198735°18°26°
198637°22°
198534°17°
198437°23°
1983-4°-23°-13°0.05"0.3"
198246°25°35°
198139°18°28°
198024°11°17°
197948°26°37°
197836°15°25°
197719°10°
197633°-3°15°
197531°10°20°
197423°14°
197326°10°18°
197226°20°23°
197125°12°18°
55 years of data from SIOUX FALLS

Browse Weather History

Weather data provided by NOAA Climate Data Online. Not for critical planning.