Alamo Weather in December
Average highs run from 75°F on December 1 to 71°F on December 31, and lows from 53°F to 49°F. Normal precipitation for the month is 0.57 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
- 73°F
- Average low
- 51°F
- Precipitation
- 0.57 in
- Snowfall
- 0.1 in
- Record high
- 96°FDec 5, 1977
- Record low
- 18°FDec 23, 1989
- Chance of a freeze
- 22%
- Daylight
- 10 h 37 min to 10 h 32 min
- Cloud cover
- 67%
- Humidity
- 72%
- Dew point
- 52°F
- Wind
- 10.3 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Dec 1 | 75°F | 53°F | 90°F 1982 | 37°F 2006 | 9% | 0% |
| Dec 2 | 75°F | 53°F | 92°F 2007 | 37°F 1976 | 9% | 0% |
| Dec 3 | 75°F | 53°F | 91°F 1978 | 33°F 1976 | 9% | 0% |
| Dec 4 | 74°F | 53°F | 92°F 1977 | 37°F 1968 | 9% | 0% |
| Dec 5 | 74°F | 52°F | 96°F 1977 | 33°F 2009 | 9% | 0% |
| Dec 6 | 74°F | 52°F | 91°F 1978 | 39°F 2002 | 9% | 0% |
| Dec 7 | 74°F | 52°F | 92°F 1996 | 35°F 2011 | 10% | 0% |
| Dec 8 | 74°F | 52°F | 89°F 2007 | 33°F 1976 | 10% | 0% |
| Dec 9 | 74°F | 52°F | 91°F 2008 | 34°F 1978 | 10% | 0% |
| Dec 10 | 73°F | 52°F | 89°F 1983 | 30°F 1978 | 10% | 0% |
| Dec 11 | 73°F | 51°F | 91°F 1987 | 35°F 1966 | 10% | 0% |
| Dec 12 | 73°F | 51°F | 89°F 1981 | 31°F 1966 | 10% | 0% |
| Dec 13 | 73°F | 51°F | 89°F 2025 | 27°F 1966 | 10% | 0% |
| Dec 14 | 73°F | 51°F | 93°F 2019 | 30°F 1966 | 10% | 0% |
| Dec 15 | 73°F | 51°F | 91°F 2019 | 33°F 1964 | 10% | 0% |
| Dec 16 | 72°F | 51°F | 89°F 1977 | 30°F 1989 | 11% | 0% |
| Dec 17 | 72°F | 50°F | 93°F 2016 | 33°F 2003 | 11% | 0% |
| Dec 18 | 72°F | 50°F | 89°F 2025 | 32°F 1964 | 11% | 0% |
| Dec 19 | 72°F | 50°F | 89°F 2012 | 26°F 1996 | 11% | 0% |
| Dec 20 | 72°F | 50°F | 90°F 2025 | 31°F 1973 | 11% | 0% |
| Dec 21 | 72°F | 50°F | 88°F 1981 | 24°F 1973 | 11% | 0% |
| Dec 22 | 72°F | 50°F | 89°F 1988 | 26°F 1989 | 11% | 0% |
| Dec 23 | 72°F | 50°F | 91°F 2015 | 18°F 1989 | 11% | 0% |
| Dec 24 | 71°F | 50°F | 91°F 1974 | 20°F 1989 | 12% | 0% |
| Dec 25 | 71°F | 49°F | 92°F 1964 | 19°F 1983 | 12% | 0% |
| Dec 26 | 71°F | 49°F | 89°F 2015 | 30°F 1983 | 12% | 0% |
| Dec 27 | 71°F | 49°F | 94°F 1968 | 37°F 1983 | 12% | 0% |
| Dec 28 | 71°F | 49°F | 91°F 2024 | 32°F 1997 | 12% | 0% |
| Dec 29 | 71°F | 49°F | 90°F 2024 | 31°F 1983 | 12% | 0% |
| Dec 30 | 71°F | 49°F | 94°F 2024 | 26°F 1983 | 12% | 0% |
| Dec 31 | 71°F | 49°F | 90°F 1985 | 32°F 1963 | 12% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- December 1
- sunrise 7:03 AM, sunset 5:40 PM
- December 31
- sunrise 7:20 AM, sunset 5:52 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00415701 (Mcallen), public domain. Records: NOAA GHCN-Daily, station USW00012959, 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.