December is one of the cooler months of the year in New Braunfels, with average highs near 18.1°C and lows around 5.9°C (mean 12°C). It is one of the drier months, averaging 49 mm of rainfall and 72% relative humidity across the period.
December is one of the cooler months of the year in New Braunfels. Across 45 years of records, the warmest December in New Braunfels was 2021 — when the month averaged 17.9°C — while the coldest was 1989 at 6.2°C. Typical December days reach 18.1°C with nights near 5.9°C. The long-term trend is warming, about 0.7°C per decade.
December is one of the drier months in New Braunfels, averaging 49 mm of rainfall. The wettest December on record was 1991 with 321 mm, while the driest was 2004 at 3 mm.
Relative humidity in New Braunfels during December averages 72%. The most humid December was 1986 at 85%, and the least humid was 2008 at 56%.
December receives about 2.7 kWh/m²/day of solar energy in New Braunfels. The sunniest Decembers were 2010, 2019 and 2020, among others at 3.3 kWh/m²/day, and the cloudiest was 1992 at 1.9.
Average wind speed in New Braunfels during December is 2.7 m/s. The windiest December was 2008 at 3.2 m/s, while the calmest was 1994 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.6°C | 12.2°C | 11.3°C | 12.3°C | 14.7°C | +4.1°C |
| Avg High | 16.5°C | 18.2°C | 17.5°C | 18.2°C | 21.2°C | +4.7°C |
| Avg Low | 4.7°C | 6.2°C | 5.0°C | 6.4°C | 8.3°C | +3.6°C |
| Avg Rain | 45 mm | 70 mm | 36 mm | 54 mm | 35 mm | -11 mm |
December temperatures in New Braunfels have risen by about 4.4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -13.3°C (1989) to a record high of 29.5°C (1987).
Rainfall in December is one of the drier months, averaging 49 mm, with a wettest year of 321 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.8°C per decade while lows rose 0.6°C per decade, widening the gap between day and night.
A quieter season to visit New Braunfels
If your dates are flexible, the more temperate months of April and October tend to be the most comfortable for visiting New Braunfels. That said, December — with days averaging 18.1°C and nights around 5.9°C (mean 12°C) and moderate rainfall (49 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 21.6°C | 15.1°C | 8.5°C | 28.9°C | 1.0°C | 12 mm | 66% | 2.4 m/s | — |
| 2024 | 22.0°C | 15.7°C | 9.5°C | 28.8°C | 1.3°C | 52 mm | 70% | 2.5 m/s | 2.7 |
| 2023 | 21.2°C | 14.5°C | 7.8°C | 26.5°C | 1.5°C | 22 mm | 68% | 2.4 m/s | 3.1 |
| 2022 | 18.8°C | 12.8°C | 6.9°C | 27.3°C | -8.7°C | 43 mm | 74% | 2.5 m/s | 2.6 |
| 2021 🔥 | 23.5°C | 17.9°C | 12.3°C | 28.8°C | 2.0°C | 20 mm | 79% | 2.4 m/s | 2.7 |
| 2020 | 19.9°C | 12.3°C | 4.8°C | 25.8°C | -1.0°C | 60 mm | 66% | 2.7 m/s | 3.3 |
| 2019 | 20.1°C | 13.1°C | 6.2°C | 26.2°C | -0.8°C | 12 mm | 67% | 2.4 m/s | 3.3 |
| 2018 | 16.7°C | 11.3°C | 6.0°C | 23.2°C | 0.7°C | 100 mm | 77% | 2.9 m/s | 2.9 |
| 2017 | 17.0°C | 11.5°C | 5.9°C | 28.7°C | -1.9°C | 96 mm | 73% | 2.5 m/s | 2.4 |
| 2016 | 17.3°C | 12.2°C | 7.1°C | 26.6°C | -5.2°C | 118 mm | 78% | 2.9 m/s | 2.2 |
| 2015 | 19.4°C | 13.5°C | 7.6°C | 26.5°C | 0.9°C | 59 mm | 80% | 2.6 m/s | 3 |
| 2014 | 17.9°C | 13.0°C | 8.0°C | 25.1°C | -0.6°C | 31 mm | 79% | 2.6 m/s | 2.3 |
| 2013 | 15.7°C | 9.7°C | 3.7°C | 27.1°C | -3.3°C | 15 mm | 74% | 2.4 m/s | 2.7 |
| 2012 | 21.1°C | 14.5°C | 7.9°C | 28.3°C | -2.6°C | 7 mm | 63% | 2.7 m/s | 2.7 |
| 2011 | 17.0°C | 11.5°C | 6.0°C | 25.3°C | -4.6°C | 84 mm | 76% | 3 m/s | 2.3 |
| 2010 | 19.9°C | 12.5°C | 5.2°C | 27.5°C | -3.3°C | 16 mm | 62% | 2.9 m/s | 3.3 |
| 2009 | 13.4°C | 8.1°C | 2.9°C | 21.5°C | -3.7°C | 53 mm | 80% | 2.6 m/s | 2.5 |
| 2008 | 19.6°C | 12.7°C | 5.8°C | 28.8°C | -0.7°C | 9 mm | 56% | 3.2 m/s | 2.8 |
| 2007 | 20.8°C | 13.7°C | 6.7°C | 28.7°C | -2.3°C | 8 mm | 66% | 2.8 m/s | 3.1 |
| 2006 | 18.8°C | 12.6°C | 6.4°C | 26.6°C | -1.8°C | 54 mm | 67% | 2.7 m/s | 2.6 |
| 2005 | 18.5°C | 11.8°C | 5.1°C | 28.0°C | -2.1°C | 7 mm | 59% | 2.6 m/s | 3 |
| 2004 | 16.3°C | 10.5°C | 4.6°C | 22.9°C | -4.2°C | 3 mm | 78% | 2.4 m/s | 3.1 |
| 2003 | 19.8°C | 12.8°C | 5.8°C | 24.9°C | -0.3°C | 8 mm | 63% | 3 m/s | 3.2 |
| 2002 | 16.8°C | 11.1°C | 5.4°C | 23.2°C | -1.4°C | 89 mm | 82% | 2.5 m/s | 2.8 |
| 2001 | 17.7°C | 11.9°C | 6.1°C | 25.3°C | -0.7°C | 83 mm | 78% | 2.6 m/s | 2.7 |
| 2000 | 13.4°C | 7.5°C | 1.6°C | 22.9°C | -3.0°C | 46 mm | 82% | 2.7 m/s | 2.5 |
| 1999 | 20.5°C | 13.0°C | 5.5°C | 29.0°C | -1.2°C | 15 mm | 57% | 2.9 m/s | 3.1 |
| 1998 | 16.7°C | 11.2°C | 5.8°C | 25.8°C | -3.5°C | 27 mm | 81% | 2.9 m/s | 2.6 |
| 1997 | 17.2°C | 10.4°C | 3.7°C | 26.0°C | -4.1°C | 74 mm | 70% | 2.8 m/s | 3.2 |
| 1996 | 18.9°C | 12.3°C | 5.8°C | 27.2°C | -6.5°C | 44 mm | 74% | 2.6 m/s | 2.9 |
| 1995 | 19.0°C | 12.7°C | 6.4°C | 28.6°C | -4.2°C | 32 mm | 71% | 2.7 m/s | 3 |
| 1994 | 18.4°C | 13.1°C | 7.8°C | 27.0°C | 1.0°C | 102 mm | 81% | 2.3 m/s | 2.3 |
| 1993 | 18.3°C | 12.5°C | 6.6°C | 26.3°C | -1.9°C | 21 mm | 69% | 2.8 m/s | 2.5 |
| 1992 | 17.3°C | 12.1°C | 6.8°C | 24.9°C | 0.9°C | 56 mm | 83% | 2.6 m/s | 1.9 |
| 1991 🌧️ | 16.9°C | 12.6°C | 8.2°C | 24.0°C | 0.1°C | 321 mm | 81% | 2.8 m/s | 2.1 |
| 1990 | 18.3°C | 11.9°C | 5.4°C | 28.0°C | -6.0°C | 7 mm | 68% | 2.9 m/s | 3 |
| 1989 ❄️ | 12.8°C | 6.2°C | -0.3°C | 23.8°C | -13.3°C | 9 mm | 64% | 2.9 m/s | 3.1 |
| 1988 | 19.8°C | 13.4°C | 7.1°C | 26.9°C | -0.2°C | 15 mm | 64% | 2.8 m/s | 2.7 |
| 1987 | 18.3°C | 12.1°C | 6.0°C | 29.5°C | -1.6°C | 54 mm | 72% | 2.7 m/s | 2.6 |
| 1986 | 14.1°C | 9.5°C | 4.8°C | 21.6°C | -2.6°C | 153 mm | 85% | 2.4 m/s | 2.2 |
| 1985 | 14.9°C | 8.7°C | 2.6°C | 23.5°C | -6.2°C | 17 mm | 79% | 2.4 m/s | 3.3 |
| 1984 | 20.4°C | 15.4°C | 10.4°C | 24.9°C | -1.1°C | 81 mm | 82% | 2.9 m/s | 2.4 |
| 1983 | 13.2°C | 7.0°C | 0.8°C | 26.9°C | -10.4°C | 10 mm | 65% | 3 m/s | — |
| 1982 | 16.5°C | 10.9°C | 5.3°C | 25.7°C | -2.5°C | 52 mm | 74% | 3.1 m/s | — |
| 1981 | 18.4°C | 11.8°C | 5.2°C | 26.2°C | -3.7°C | 18 mm | 69% | 2.8 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 18.1°C with lows near 5.9°C (mean 12°C), based on 45 years of NASA POWER data.
December averages 49 mm of rainfall in New Braunfels, one of the drier months. The wettest on record was 321 mm in 1991.
The hottest December reached 29.5°C in 1987. The coldest dipped to -13.3°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 4.4°C. Daytime highs moved from 16.7°C to 21.4°C and overnight lows from 4.9°C to 9°C over the same span.
December is one of the cooler months of the year in New Braunfels and one of the drier months, so plan for around 18.1°C daytime highs and 5.9°C at night.
Not quite — December is the 2nd coolest month in New Braunfels, averaging 12°C.
For December in New Braunfels, pack warm layers and a jacket for chilly mornings, with typical highs of 18.1°C and lows of 5.9°C.
Relative humidity in December averages 72% — moderately humid.
Average wind speed in December is 2.7 m/s. The windiest December on record averaged 3.2 m/s (2008).
The wettest December on record was 1991 with 321 mm. On average, December sees 49 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in New Braunfels behaves each December, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for December specifically, along with year-by-year records and how the month has changed over the decades.
