December is one of the cooler months of the year in Conroe, with average highs near 16.7°C and lows around 5.6°C (mean 11.1°C). It is about average for rainfall, averaging 103 mm of rainfall and 82% relative humidity across the period.
December is one of the cooler months of the year in Conroe. Across 45 years of records, the warmest December in Conroe was 2021 — when the month averaged 18.3°C — while the coldest was 1989 at 5.7°C. Typical December days reach 16.7°C with nights near 5.6°C. The long-term trend is warming, about 0.8°C per decade.
December is about average for rainfall in Conroe, averaging 103 mm of rainfall. The wettest December on record was 2018 with 213 mm, while the driest were 2019 and 2025 at 25 mm.
Relative humidity in Conroe during December averages 82%. The most humid December was 1994 at 90%, and the least humid was 1989 at 68%.
December receives about 2.5 kWh/m²/day of solar energy in Conroe. The sunniest Decembers were 2003, 2019 and 2023 at 3.1 kWh/m²/day, and the cloudiest was 1992 at 1.8.
Average wind speed in Conroe during December is 0.9 m/s. The windiest Decembers were 1983 and 2008 at 1.1 m/s, while the calmest were 2014, 2023 and 2024, among others at 0.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.8°C | 11.2°C | 10.0°C | 11.7°C | 13.9°C | +4.1°C |
| Avg High | 15.1°C | 16.6°C | 15.7°C | 17.3°C | 19.9°C | +4.8°C |
| Avg Low | 4.5°C | 5.8°C | 4.4°C | 6.1°C | 7.8°C | +3.3°C |
| Avg Rain | 103 mm | 127 mm | 94 mm | 98 mm | 89 mm | -14 mm |
December temperatures in Conroe have risen by about 4.2°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -13.8°C (1989) to a record high of 28.4°C (2012).
Rainfall in December is about average for rainfall, averaging 103 mm, with a wettest year of 213 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.9°C per decade while lows rose 0.6°C per decade, widening the gap between day and night.
A quieter season to visit Conroe
If your dates are flexible, the more temperate months of October and April tend to be the most comfortable for visiting Conroe. That said, December — with days averaging 16.7°C and nights around 5.6°C (mean 11.1°C) and higher rainfall (103 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 | 19.9°C | 13.7°C | 7.5°C | 28.0°C | -1.9°C | 25 mm | 77% | 0.9 m/s | — |
| 2024 | 20.6°C | 14.5°C | 8.4°C | 27.4°C | 0.8°C | 121 mm | 79% | 0.8 m/s | 2.6 |
| 2023 | 19.2°C | 12.8°C | 6.5°C | 26.4°C | -0.7°C | 55 mm | 75% | 0.8 m/s | 3.1 |
| 2022 | 17.9°C | 12.3°C | 6.7°C | 27.5°C | -9.1°C | 139 mm | 81% | 0.9 m/s | 2.5 |
| 2021 🔥 | 23.8°C | 18.3°C | 12.8°C | 28.2°C | 1.7°C | 54 mm | 83% | 0.9 m/s | 2.5 |
| 2020 | 18.2°C | 11.6°C | 5.1°C | 24.9°C | -1.9°C | 137 mm | 79% | 1 m/s | 2.8 |
| 2019 | 19.0°C | 12.4°C | 5.8°C | 27.2°C | -1.7°C | 25 mm | 73% | 0.9 m/s | 3.1 |
| 2018 🌧️ | 15.4°C | 10.7°C | 6.1°C | 21.8°C | 0.2°C | 213 mm | 85% | 1 m/s | 2.6 |
| 2017 | 15.9°C | 10.4°C | 5.0°C | 26.4°C | -2.9°C | 123 mm | 80% | 0.9 m/s | 2.2 |
| 2016 | 17.9°C | 12.7°C | 7.5°C | 26.4°C | -4.5°C | 105 mm | 81% | 1 m/s | 2.2 |
| 2015 | 19.1°C | 13.7°C | 8.2°C | 26.6°C | 1.1°C | 137 mm | 86% | 0.9 m/s | 2.7 |
| 2014 | 17.4°C | 12.3°C | 7.2°C | 24.8°C | 0.1°C | 103 mm | 85% | 0.8 m/s | 2 |
| 2013 | 14.0°C | 8.7°C | 3.4°C | 24.8°C | -2.9°C | 30 mm | 85% | 0.9 m/s | 2.4 |
| 2012 | 19.8°C | 13.4°C | 7.1°C | 28.4°C | -2.4°C | 75 mm | 75% | 0.9 m/s | 2.7 |
| 2011 | 16.0°C | 10.8°C | 5.6°C | 24.4°C | -4.7°C | 126 mm | 84% | 0.9 m/s | 2.2 |
| 2010 | 18.3°C | 11.7°C | 5.2°C | 27.5°C | -4.0°C | 41 mm | 70% | 1 m/s | 2.8 |
| 2009 | 12.6°C | 7.7°C | 2.8°C | 23.0°C | -3.9°C | 127 mm | 85% | 0.9 m/s | 2.3 |
| 2008 | 16.8°C | 10.8°C | 4.8°C | 25.5°C | -3.0°C | 47 mm | 76% | 1.1 m/s | 2.3 |
| 2007 | 18.3°C | 12.1°C | 5.9°C | 26.2°C | -3.5°C | 72 mm | 81% | 0.9 m/s | 2.9 |
| 2006 | 16.2°C | 10.8°C | 5.4°C | 23.8°C | -3.6°C | 95 mm | 82% | 0.9 m/s | 2.5 |
| 2005 | 16.2°C | 10.1°C | 3.9°C | 28.0°C | -3.0°C | 66 mm | 72% | 0.9 m/s | 2.9 |
| 2004 | 15.7°C | 10.1°C | 4.5°C | 23.5°C | -4.4°C | 50 mm | 83% | 0.9 m/s | 2.9 |
| 2003 | 16.4°C | 10.2°C | 4.0°C | 22.1°C | -2.4°C | 66 mm | 79% | 1 m/s | 3.1 |
| 2002 | 15.5°C | 10.4°C | 5.4°C | 23.0°C | -3.1°C | 175 mm | 88% | 1 m/s | 2.4 |
| 2001 | 16.9°C | 11.5°C | 6.1°C | 25.3°C | -2.2°C | 152 mm | 84% | 0.9 m/s | 2.7 |
| 2000 | 12.0°C | 6.6°C | 1.3°C | 22.7°C | -4.1°C | 93 mm | 85% | 1 m/s | 2.4 |
| 1999 | 18.4°C | 11.6°C | 4.8°C | 26.6°C | -2.1°C | 69 mm | 74% | 1 m/s | 3 |
| 1998 | 15.9°C | 10.9°C | 5.9°C | 25.8°C | -4.0°C | 122 mm | 88% | 0.9 m/s | 2.4 |
| 1997 | 14.8°C | 9.0°C | 3.3°C | 23.7°C | -4.2°C | 133 mm | 83% | 1 m/s | 2.9 |
| 1996 | 17.4°C | 11.8°C | 6.2°C | 25.0°C | -6.8°C | 101 mm | 84% | 1 m/s | 2.7 |
| 1995 | 17.3°C | 11.6°C | 6.0°C | 28.1°C | -4.7°C | 149 mm | 80% | 0.9 m/s | 2.6 |
| 1994 | 16.7°C | 11.8°C | 6.8°C | 26.1°C | -1.1°C | 177 mm | 90% | 0.8 m/s | 2.3 |
| 1993 | 15.1°C | 10.1°C | 5.2°C | 23.7°C | -3.4°C | 85 mm | 84% | 0.9 m/s | 2.4 |
| 1992 | 17.0°C | 11.9°C | 6.9°C | 24.4°C | 1.6°C | 133 mm | 88% | 0.9 m/s | 1.8 |
| 1991 | 16.4°C | 12.2°C | 8.0°C | 23.0°C | -1.4°C | 211 mm | 87% | 0.9 m/s | 2.2 |
| 1990 | 17.2°C | 11.1°C | 5.0°C | 26.5°C | -7.1°C | 84 mm | 77% | 1 m/s | 2.4 |
| 1989 ❄️ | 11.9°C | 5.7°C | -0.5°C | 24.9°C | -13.8°C | 51 mm | 68% | 1 m/s | 2.9 |
| 1988 | 18.4°C | 12.3°C | 6.2°C | 25.2°C | -0.6°C | 97 mm | 76% | 0.9 m/s | 2.5 |
| 1987 | 16.1°C | 10.8°C | 5.5°C | 24.1°C | -3.5°C | 148 mm | 87% | 0.9 m/s | 2.2 |
| 1986 | 13.1°C | 8.8°C | 4.6°C | 21.2°C | 0.1°C | 146 mm | 89% | 0.8 m/s | 2.2 |
| 1985 | 13.8°C | 8.1°C | 2.4°C | 22.2°C | -6.1°C | 72 mm | 84% | 0.9 m/s | 2.9 |
| 1984 | 19.5°C | 14.9°C | 10.4°C | 24.7°C | -3.5°C | 109 mm | 89% | 0.9 m/s | 2.3 |
| 1983 | 11.0°C | 5.8°C | 0.6°C | 26.0°C | -12.8°C | 103 mm | 80% | 1.1 m/s | — |
| 1982 | 16.3°C | 11.3°C | 6.3°C | 26.0°C | -3.7°C | 164 mm | 87% | 1 m/s | — |
| 1981 | 15.9°C | 10.3°C | 4.8°C | 24.2°C | -4.4°C | 36 mm | 81% | 1 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 5.6°C (mean 11.1°C), based on 45 years of NASA POWER data.
December averages 103 mm of rainfall in Conroe, about average for rainfall. The wettest on record was 213 mm in 2018.
The hottest December reached 28.4°C in 2012. The coldest dipped to -13.8°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 4.2°C. Daytime highs moved from 15.3°C to 20.3°C and overnight lows from 4.9°C to 8.4°C over the same span.
December is one of the cooler months of the year in Conroe and about average for rainfall, so plan for around 16.7°C daytime highs and 5.6°C at night.
Not quite — December is the 2nd coolest month in Conroe, averaging 11.1°C.
For December in Conroe, pack warm layers and a jacket for chilly mornings, with typical highs of 16.7°C and lows of 5.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 82% — quite humid.
Average wind speed in December is 0.9 m/s. The windiest December on record averaged 1.1 m/s (1983).
The wettest December on record was 2018 with 213 mm. On average, December sees 103 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 Conroe 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.
