Weather on December 21
Saint Louis, MO
55 Years of Data
Avg High
43°F
Avg Low
25°F
Warmest
2015
52°F avg
Coldest
1989
-4°F avg
About This Date
December 21st in Saint Louis, MO typically brings chilly winter weather, with average highs around 43°F and lows near 25°F. Over 54 years of records, the warmest December 21st was in 2015 (52°F average), while the coldest was 1989 (-4°F) — a 56°F range across recorded history. Precipitation has occurred on 30% of recorded December 21st dates, with snow falling 2% of the time. The last decade has been 8.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 8.0°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Saint Louis, MO? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Warming Trend
1.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 47° | 21° | 34° | — | — |
| 2024 | 39° | 24° | 32° | — | — |
| 2023 | 59° | 36° | 47° | 0.03" | — |
| 2022 | 39° | 24° | 32° | — | — |
| 2021 | 51° | 24° | 38° | — | — |
| 2020 | 59° | 37° | 48° | — | — |
| 2019 | 49° | 20° | 35° | — | — |
| 2018 | 38° | 27° | 33° | — | — |
| 2017 | 56° | 39° | 47° | — | — |
| 2016 | 52° | 20° | 36° | — | — |
| 2015warmest | 56° | 48° | 52° | 0.46" | — |
| 2014 | 41° | 37° | 39° | — | — |
| 2013 | 69° | 33° | 51° | 1.52" | — |
| 2012 | 38° | 25° | 31° | 0.08" | — |
| 2011 | 49° | 43° | 46° | 0.3" | — |
| 2010 | 44° | 32° | 38° | — | — |
| 2009 | 34° | 26° | 30° | — | — |
| 2008 | 38° | 6° | 22° | — | — |
| 2007 | 45° | 38° | 41° | 0.89" | — |
| 2006 | 54° | 30° | 42° | 2.13" | — |
| 2005 | 35° | 16° | 25° | — | — |
| 2004 | 37° | 14° | 26° | — | — |
| 2003 | 53° | 27° | 40° | — | — |
| 2002 | 50° | 34° | 42° | — | — |
| 2001 | 53° | 25° | 39° | — | — |
| 2000 | 26° | 9° | 17° | — | — |
| 1999 | 35° | 14° | 25° | — | — |
| 1998 | 40° | 32° | 36° | 0.46" | — |
| 1997 | 36° | 32° | 34° | — | — |
| 1996 | 27° | 10° | 18° | — | — |
| 1995 | 27° | 23° | 25° | — | — |
| 1994 | 46° | 40° | 43° | 0.51" | — |
| 1993 | 43° | 26° | 34° | — | — |
| 1992 | 48° | 23° | 36° | — | — |
| 1991 | 37° | 35° | 36° | 0.53" | — |
| 1990 | 51° | 7° | 29° | 3.68" | — |
| 1989coldest | 10° | -18° | -4° | 0.1" | 0.5" |
| 1988 | 47° | 26° | 36° | — | — |
| 1987 | 49° | 30° | 39° | — | — |
| 1986 | 44° | 22° | 33° | — | — |
| 1985 | 24° | 10° | 17° | — | — |
| 1984 | 63° | 30° | 46° | — | — |
| 1982 | 48° | 25° | 36° | — | — |
| 1981 | 33° | 1° | 17° | 0.13" | — |
| 1980 | 24° | 10° | 17° | — | — |
| 1979 | 58° | 34° | 46° | — | — |
| 1978 | 65° | 24° | 44° | 0.08" | — |
| 1977 | 32° | 18° | 25° | — | — |
| 1976 | 37° | 9° | 23° | — | — |
| 1975 | 38° | 24° | 31° | — | — |
| 1974 | 51° | 33° | 42° | — | — |
| 1973 | 16° | — | — | — | — |
| 1972 | 36° | 32° | 34° | 0.03" | — |
| 1971 | 48° | 37° | 43° | 0.05" | — |
54 years of data from ST LOUIS ST LOUIS UNIV