Costilla County Weather in December
Average highs run from 42°F on December 1 to 37°F on December 31, and lows from 12°F to 7°F. Normal precipitation for the month is 0.41 in over about 3 wet days.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 39°F
- Average low
- 9°F
- Precipitation
- 0.41 in
- Record high
- 61°FDec 1, 1999
- Record low
- -20°FDec 21, 1990
- Chance of a freeze
- 100%
- Daylight
- 9 h 47 min to 9 h 38 min
- Cloud cover
- 55%
- Humidity
- 68%
- Dew point
- 14°F
- Wind
- 7.8 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 42°F | 12°F | 61°F 1999 | -4°F 2001 | 9% |
| Dec 2 | 42°F | 12°F | 61°F 1995 | 7°F 2004 | 9% |
| Dec 3 | 42°F | 12°F | 61°F 1995 | -3°F 2006 | 9% |
| Dec 4 | 41°F | 11°F | 59°F 1998 | -4°F 2009 | 9% |
| Dec 5 | 41°F | 11°F | 56°F 1995 | 1°F 2011 | 9% |
| Dec 6 | 41°F | 11°F | 56°F 1998 | -7°F 2011 | 9% |
| Dec 7 | 40°F | 10°F | 54°F 2014 | -8°F 2013 | 9% |
| Dec 8 | 40°F | 10°F | 54°F 2008 | -12°F 2005 | 9% |
| Dec 9 | 40°F | 10°F | 54°F 2006 | -8°F 2013 | 9% |
| Dec 10 | 39°F | 10°F | 57°F 1990 | -3°F 2009 | 9% |
| Dec 11 | 39°F | 10°F | 58°F 2007 | 1°F 1989 | 9% |
| Dec 12 | 39°F | 9°F | 58°F 2014 | -2°F 1997 | 9% |
| Dec 13 | 39°F | 9°F | 57°F 2015 | -1°F 1992 | 9% |
| Dec 14 | 39°F | 9°F | 58°F 2014 | 6°F 1997 | 9% |
| Dec 15 | 38°F | 9°F | 58°F 1995 | -6°F 2007 | 9% |
| Dec 16 | 38°F | 9°F | 59°F 2016 | -2°F 1989 | 9% |
| Dec 17 | 38°F | 8°F | 56°F 2017 | -8°F 1996 | 8% |
| Dec 18 | 38°F | 8°F | 54°F 1998 | -12°F 1996 | 8% |
| Dec 19 | 38°F | 8°F | 59°F 2010 | -11°F 1996 | 8% |
| Dec 20 | 38°F | 8°F | 55°F 2003 | -19°F 1990 | 8% |
| Dec 21 | 37°F | 8°F | 55°F 2003 | -20°F 1990 | 8% |
| Dec 22 | 37°F | 8°F | 51°F 1994 | -12°F 1990 | 8% |
| Dec 23 | 37°F | 8°F | 54°F 1994 | -11°F 1990 | 8% |
| Dec 24 | 37°F | 8°F | 50°F 1994 | -13°F 2004 | 8% |
| Dec 25 | 37°F | 7°F | 51°F 2016 | 2°F 2004 | 8% |
| Dec 26 | 37°F | 7°F | 57°F 2005 | 2°F 2007 | 8% |
| Dec 27 | 37°F | 7°F | 56°F 2005 | -3°F 2014 | 7% |
| Dec 28 | 37°F | 7°F | 52°F 2013 | -3°F 2007 | 7% |
| Dec 29 | 37°F | 7°F | 58°F 1999 | -6°F 1990 | 7% |
| Dec 30 | 37°F | 7°F | 56°F 1999 | -9°F 2014 | 7% |
| Dec 31 | 37°F | 7°F | 51°F 1999 | -10°F 2014 | 7% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 6:57 AM, sunset 4:44 PM
- December 31
- sunrise 7:16 AM, sunset 4:54 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00057430 (San Luis 1 S), public domain. Records: NOAA GHCN-Daily, station USC00057572, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.