December is one of the cooler months of the year in Bryan, with average highs near 16.7°C and lows around 5.3°C (mean 11°C). It is about average for rainfall, averaging 87 mm of rainfall and 79% relative humidity across the period.
December is one of the cooler months of the year in Bryan. Across 45 years of records, the warmest December in Bryan was 2021 — when the month averaged 17.9°C — while the coldest was 1989 at 5.4°C. Typical December days reach 16.7°C with nights near 5.3°C. The long-term trend is warming, about 0.8°C per decade.
December is about average for rainfall in Bryan, averaging 87 mm of rainfall. The wettest December on record was 1991 with 236 mm, while the driest was 2025 at 13 mm.
Relative humidity in Bryan during December averages 79%. The most humid Decembers were 1984 and 1994 at 88%, and the least humid was 1989 at 66%.
December receives about 2.6 kWh/m²/day of solar energy in Bryan. The sunniest Decembers were 2003 and 2023 at 3.2 kWh/m²/day, and the cloudiest was 1992 at 1.8.
Average wind speed in Bryan during December is 2.4 m/s. The windiest December was 2008 at 2.9 m/s, while the calmest were 1986 and 1994 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.5°C | 11.1°C | 10.1°C | 11.5°C | 13.9°C | +4.4°C |
| Avg High | 15.0°C | 16.7°C | 15.8°C | 17.1°C | 20.1°C | +5.1°C |
| Avg Low | 4.1°C | 5.5°C | 4.3°C | 5.9°C | 7.7°C | +3.6°C |
| Avg Rain | 82 mm | 110 mm | 77 mm | 86 mm | 74 mm | -8 mm |
December temperatures in Bryan have risen by about 4.5°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -15.6°C (1989) to a record high of 28.5°C (2025).
Rainfall in December is about average for rainfall, averaging 87 mm, with a wettest year of 236 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 1°C per decade while lows rose 0.6°C per decade, widening the gap between day and night.
A quieter season to visit Bryan
If your dates are flexible, the more temperate months of October and April tend to be the most comfortable for visiting Bryan. That said, December — with days averaging 16.7°C and nights around 5.3°C (mean 11°C) and higher rainfall (87 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 | 20.2°C | 13.8°C | 7.4°C | 28.5°C | -1.7°C | 13 mm | 73% | 2.2 m/s | — |
| 2024 | 21.0°C | 14.8°C | 8.5°C | 27.7°C | 0.7°C | 99 mm | 76% | 2.2 m/s | 2.7 |
| 2023 | 19.8°C | 13.2°C | 6.6°C | 26.6°C | -0.2°C | 53 mm | 71% | 2 m/s | 3.2 |
| 2022 | 17.6°C | 12.0°C | 6.3°C | 27.2°C | -9.4°C | 100 mm | 80% | 2.2 m/s | 2.4 |
| 2021 🔥 | 23.3°C | 17.9°C | 12.6°C | 28.4°C | 1.3°C | 54 mm | 82% | 2.4 m/s | 2.6 |
| 2020 | 18.8°C | 11.7°C | 4.7°C | 25.7°C | -1.4°C | 126 mm | 74% | 2.3 m/s | 2.9 |
| 2019 | 18.9°C | 12.3°C | 5.7°C | 27.4°C | -1.6°C | 20 mm | 71% | 2.1 m/s | 3.1 |
| 2018 | 15.2°C | 10.5°C | 5.7°C | 22.1°C | 0.2°C | 190 mm | 84% | 2.5 m/s | 2.6 |
| 2017 | 16.1°C | 10.6°C | 5.1°C | 27.1°C | -2.3°C | 103 mm | 77% | 2.1 m/s | 2.3 |
| 2016 | 17.5°C | 12.2°C | 7.0°C | 26.6°C | -5.6°C | 93 mm | 79% | 2.6 m/s | 2.1 |
| 2015 | 18.8°C | 13.2°C | 7.7°C | 25.4°C | 0.7°C | 140 mm | 86% | 2.3 m/s | 2.8 |
| 2014 | 16.9°C | 12.1°C | 7.3°C | 24.8°C | 0.4°C | 87 mm | 83% | 2.2 m/s | 2.2 |
| 2013 | 13.6°C | 8.3°C | 2.9°C | 23.9°C | -3.6°C | 27 mm | 85% | 2.2 m/s | 2.5 |
| 2012 | 19.5°C | 13.1°C | 6.8°C | 28.2°C | -3.1°C | 69 mm | 73% | 2.4 m/s | 2.8 |
| 2011 | 16.1°C | 10.8°C | 5.4°C | 24.5°C | -5.2°C | 104 mm | 81% | 2.3 m/s | 2.2 |
| 2010 | 18.6°C | 11.9°C | 5.1°C | 28.1°C | -4.1°C | 28 mm | 66% | 2.7 m/s | 2.9 |
| 2009 | 12.6°C | 7.6°C | 2.6°C | 22.8°C | -4.7°C | 97 mm | 84% | 2.2 m/s | 2.3 |
| 2008 | 17.5°C | 11.1°C | 4.6°C | 26.2°C | -3.2°C | 24 mm | 70% | 2.9 m/s | 2.4 |
| 2007 | 18.3°C | 11.9°C | 5.6°C | 26.5°C | -4.0°C | 64 mm | 78% | 2.4 m/s | 3 |
| 2006 | 16.4°C | 10.9°C | 5.4°C | 24.3°C | -4.0°C | 92 mm | 80% | 2.2 m/s | 2.7 |
| 2005 | 16.6°C | 10.2°C | 3.8°C | 28.4°C | -3.6°C | 40 mm | 68% | 2.3 m/s | 2.9 |
| 2004 | 15.8°C | 10.1°C | 4.4°C | 23.0°C | -4.9°C | 30 mm | 82% | 2.2 m/s | 2.9 |
| 2003 | 17.1°C | 10.7°C | 4.4°C | 22.9°C | -2.1°C | 50 mm | 75% | 2.6 m/s | 3.2 |
| 2002 | 15.5°C | 10.4°C | 5.2°C | 23.1°C | -3.3°C | 168 mm | 87% | 2.5 m/s | 2.5 |
| 2001 | 16.9°C | 11.3°C | 5.8°C | 25.3°C | -2.7°C | 122 mm | 82% | 2.3 m/s | 2.7 |
| 2000 | 11.7°C | 6.3°C | 1.0°C | 23.0°C | -4.3°C | 89 mm | 85% | 2.5 m/s | 2.5 |
| 1999 | 19.0°C | 11.9°C | 4.8°C | 27.6°C | -1.8°C | 43 mm | 69% | 2.6 m/s | 3 |
| 1998 | 15.5°C | 10.5°C | 5.5°C | 25.7°C | -3.7°C | 99 mm | 88% | 2.4 m/s | 2.4 |
| 1997 | 15.0°C | 9.0°C | 3.1°C | 23.4°C | -4.4°C | 107 mm | 80% | 2.3 m/s | 3 |
| 1996 | 17.4°C | 11.5°C | 5.5°C | 25.3°C | -6.6°C | 82 mm | 82% | 2.4 m/s | 2.8 |
| 1995 | 17.4°C | 11.6°C | 5.8°C | 27.7°C | -5.1°C | 104 mm | 78% | 2.4 m/s | 2.6 |
| 1994 | 16.7°C | 11.7°C | 6.8°C | 25.0°C | -0.8°C | 174 mm | 88% | 1.9 m/s | 2.2 |
| 1993 | 15.4°C | 10.2°C | 5.1°C | 23.9°C | -3.8°C | 71 mm | 82% | 2.3 m/s | 2.3 |
| 1992 | 16.8°C | 11.7°C | 6.5°C | 24.3°C | 1.1°C | 122 mm | 87% | 2.3 m/s | 1.8 |
| 1991 🌧️ | 16.5°C | 12.2°C | 7.9°C | 24.2°C | -0.6°C | 236 mm | 85% | 2.4 m/s | 2.1 |
| 1990 | 17.2°C | 10.8°C | 4.4°C | 26.8°C | -6.7°C | 59 mm | 74% | 2.6 m/s | 2.6 |
| 1989 ❄️ | 11.7°C | 5.4°C | -0.9°C | 24.8°C | -15.6°C | 29 mm | 66% | 2.6 m/s | 2.9 |
| 1988 | 18.4°C | 12.2°C | 6.0°C | 25.7°C | -0.6°C | 80 mm | 74% | 2.4 m/s | 2.6 |
| 1987 | 15.9°C | 10.4°C | 4.9°C | 23.9°C | -3.9°C | 113 mm | 84% | 2.3 m/s | 2.3 |
| 1986 | 13.2°C | 8.8°C | 4.4°C | 21.7°C | -0.5°C | 149 mm | 87% | 1.9 m/s | 2.3 |
| 1985 | 13.6°C | 7.9°C | 2.2°C | 22.3°C | -6.4°C | 50 mm | 84% | 2.2 m/s | 2.9 |
| 1984 | 19.2°C | 14.6°C | 9.9°C | 24.6°C | -2.8°C | 113 mm | 88% | 2.5 m/s | 2.2 |
| 1983 | 11.0°C | 5.5°C | -0.1°C | 26.2°C | -13.1°C | 68 mm | 76% | 2.8 m/s | — |
| 1982 | 15.7°C | 10.8°C | 5.8°C | 26.1°C | -3.9°C | 114 mm | 84% | 2.6 m/s | — |
| 1981 | 15.9°C | 10.3°C | 4.6°C | 24.3°C | -5.0°C | 23 mm | 79% | 2.5 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 16.7°C with lows near 5.3°C (mean 11°C), based on 45 years of NASA POWER data.
December averages 87 mm of rainfall in Bryan, about average for rainfall. The wettest on record was 236 mm in 1991.
The hottest December reached 28.5°C in 2025. The coldest dipped to -15.6°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 4.5°C. Daytime highs moved from 15.1°C to 20.4°C and overnight lows from 4.5°C to 8.3°C over the same span.
December is one of the cooler months of the year in Bryan and about average for rainfall, so plan for around 16.7°C daytime highs and 5.3°C at night.
Not quite — December is the 2nd coolest month in Bryan, averaging 11°C.
For December in Bryan, pack warm layers and a jacket for chilly mornings, with typical highs of 16.7°C and lows of 5.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 79% — quite humid.
Average wind speed in December is 2.4 m/s. The windiest December on record averaged 2.9 m/s (2008).
The wettest December on record was 1991 with 236 mm. On average, December sees 87 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 Bryan 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.
