December is one of the cooler months of the year in Tyler, with average highs near 14°C and lows around 3.2°C (mean 8.6°C). It is a relatively wet time of year, averaging 111 mm of rainfall and 81% relative humidity across the period.
December is one of the cooler months of the year in Tyler. Across 45 years of records, the warmest December in Tyler was 2021 — when the month averaged 16.1°C — while the coldest was 1983 at 2.8°C. Typical December days reach 14°C with nights near 3.2°C. The long-term trend is warming, about 0.8°C per decade.
December is a relatively wet time of year in Tyler, averaging 111 mm of rainfall. The wettest December on record was 1987 with 252 mm, while the driest was 1981 at 10 mm.
Relative humidity in Tyler during December averages 81%. The most humid Decembers were 1984 and 1994 at 89%, and the least humid was 1989 at 64%.
December receives about 2.5 kWh/m²/day of solar energy in Tyler. The sunniest December was 2005 at 3 kWh/m²/day, and the cloudiest was 1992 at 1.7.
Average wind speed in Tyler during December is 2 m/s. The windiest December was 2008 at 2.4 m/s, while the calmest was 1986 at 1.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.1°C | 8.6°C | 7.8°C | 9.2°C | 11.1°C | +4°C |
| Avg High | 12.3°C | 13.8°C | 13.4°C | 14.7°C | 16.8°C | +4.5°C |
| Avg Low | 1.9°C | 3.4°C | 2.2°C | 3.7°C | 5.5°C | +3.6°C |
| Avg Rain | 117 mm | 121 mm | 103 mm | 112 mm | 98 mm | -19 mm |
December temperatures in Tyler have risen by about 4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -16.5°C (1989) to a record high of 27.1°C (2021).
Rainfall in December is a relatively wet time of year, averaging 111 mm, with a wettest year of 252 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.9°C per decade while lows rose 0.7°C per decade, widening the gap between day and night.
A quieter season to visit Tyler
If your dates are flexible, the more temperate months of May and October tend to be the most comfortable for visiting Tyler. That said, December — with days averaging 14°C and nights around 3.2°C (mean 8.6°C) and higher rainfall (111 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 | 16.6°C | 10.5°C | 4.5°C | 26.7°C | -5.4°C | 22 mm | 79% | 1.9 m/s | — |
| 2024 | 16.5°C | 11.3°C | 6.1°C | 24.3°C | -1.3°C | 194 mm | 84% | 1.8 m/s | 2.5 |
| 2023 | 16.1°C | 10.0°C | 3.9°C | 23.7°C | -2.1°C | 47 mm | 75% | 1.8 m/s | 2.9 |
| 2022 | 14.7°C | 9.8°C | 4.9°C | 25.6°C | -10.8°C | 109 mm | 82% | 1.9 m/s | 2.1 |
| 2021 🔥 | 22.0°C | 16.1°C | 10.3°C | 27.1°C | -0.8°C | 52 mm | 80% | 2.2 m/s | 2.3 |
| 2020 | 15.1°C | 9.1°C | 3.0°C | 23.0°C | -2.6°C | 163 mm | 78% | 2 m/s | 2.6 |
| 2019 | 16.8°C | 10.3°C | 3.8°C | 26.1°C | -3.0°C | 34 mm | 75% | 1.8 m/s | 2.9 |
| 2018 | 12.9°C | 8.5°C | 4.1°C | 20.0°C | -2.8°C | 224 mm | 86% | 2.1 m/s | 2.5 |
| 2017 | 14.2°C | 8.6°C | 3.0°C | 26.2°C | -5.3°C | 136 mm | 73% | 1.8 m/s | 2.3 |
| 2016 | 15.1°C | 9.9°C | 4.7°C | 25.8°C | -6.9°C | 85 mm | 77% | 2.1 m/s | 1.9 |
| 2015 | 16.9°C | 11.4°C | 5.9°C | 24.2°C | -0.2°C | 189 mm | 87% | 2 m/s | 2.7 |
| 2014 | 14.3°C | 9.6°C | 5.0°C | 24.0°C | -2.3°C | 55 mm | 85% | 1.9 m/s | 2 |
| 2013 | 11.8°C | 6.5°C | 1.1°C | 23.6°C | -7.9°C | 100 mm | 86% | 1.7 m/s | 2.4 |
| 2012 | 16.9°C | 10.7°C | 4.5°C | 26.5°C | -5.0°C | 95 mm | 73% | 2.1 m/s | 2.5 |
| 2011 | 13.4°C | 8.3°C | 3.2°C | 21.0°C | -5.2°C | 170 mm | 84% | 1.8 m/s | 2.2 |
| 2010 | 14.3°C | 8.2°C | 2.1°C | 25.6°C | -5.3°C | 26 mm | 71% | 2.3 m/s | 2.8 |
| 2009 | 9.5°C | 5.2°C | 0.8°C | 20.2°C | -4.9°C | 110 mm | 87% | 1.9 m/s | 2.4 |
| 2008 | 14.3°C | 8.2°C | 2.1°C | 23.9°C | -6.2°C | 47 mm | 75% | 2.4 m/s | 2.5 |
| 2007 | 16.2°C | 9.8°C | 3.4°C | 26.6°C | -5.5°C | 90 mm | 79% | 2 m/s | 2.7 |
| 2006 | 14.7°C | 9.1°C | 3.5°C | 23.5°C | -6.6°C | 126 mm | 79% | 1.9 m/s | 2.7 |
| 2005 | 14.8°C | 8.3°C | 1.8°C | 26.5°C | -7.3°C | 18 mm | 66% | 2 m/s | 3 |
| 2004 | 13.5°C | 7.9°C | 2.3°C | 21.1°C | -9.6°C | 57 mm | 83% | 1.9 m/s | 2.9 |
| 2003 | 15.1°C | 8.6°C | 2.1°C | 21.9°C | -3.6°C | 67 mm | 73% | 2.3 m/s | 2.9 |
| 2002 | 13.4°C | 8.4°C | 3.3°C | 22.4°C | -4.7°C | 189 mm | 86% | 2.1 m/s | 2.3 |
| 2001 | 14.6°C | 9.4°C | 4.1°C | 24.7°C | -4.6°C | 170 mm | 84% | 1.9 m/s | 2.6 |
| 2000 | 7.7°C | 2.9°C | -1.9°C | 20.6°C | -8.3°C | 158 mm | 86% | 2 m/s | 2.4 |
| 1999 | 16.0°C | 9.4°C | 2.8°C | 26.3°C | -4.1°C | 89 mm | 73% | 2.1 m/s | 2.8 |
| 1998 | 13.1°C | 8.3°C | 3.5°C | 25.0°C | -6.0°C | 150 mm | 88% | 2 m/s | 2.3 |
| 1997 | 11.9°C | 6.6°C | 1.3°C | 20.2°C | -3.6°C | 119 mm | 84% | 2 m/s | 2.6 |
| 1996 | 14.9°C | 9.5°C | 4.0°C | 23.5°C | -6.4°C | 66 mm | 85% | 2.2 m/s | 2.6 |
| 1995 | 14.7°C | 9.1°C | 3.6°C | 26.1°C | -6.6°C | 98 mm | 76% | 2.1 m/s | 2.4 |
| 1994 | 14.0°C | 9.2°C | 4.4°C | 23.1°C | -4.2°C | 204 mm | 89% | 1.6 m/s | 2.1 |
| 1993 | 13.4°C | 8.1°C | 2.9°C | 21.2°C | -4.9°C | 53 mm | 83% | 2.1 m/s | 2.4 |
| 1992 | 13.3°C | 8.7°C | 4.1°C | 22.3°C | -0.4°C | 157 mm | 88% | 1.9 m/s | 1.7 |
| 1991 | 13.7°C | 9.5°C | 5.4°C | 21.6°C | -2.4°C | 172 mm | 88% | 1.8 m/s | 2.2 |
| 1990 | 13.1°C | 7.5°C | 1.9°C | 24.0°C | -8.8°C | 104 mm | 84% | 2.1 m/s | 2.3 |
| 1989 | 10.0°C | 3.8°C | -2.4°C | 22.0°C | -16.5°C | 34 mm | 64% | 2.1 m/s | 2.7 |
| 1988 | 14.0°C | 8.3°C | 2.5°C | 22.3°C | -3.8°C | 115 mm | 83% | 1.9 m/s | 2.4 |
| 1987 🌧️ | 12.9°C | 8.1°C | 3.3°C | 21.7°C | -4.6°C | 252 mm | 87% | 1.9 m/s | 2.2 |
| 1986 | 11.0°C | 6.7°C | 2.5°C | 15.4°C | -2.4°C | 130 mm | 87% | 1.5 m/s | 2.1 |
| 1985 | 11.1°C | 5.5°C | -0.1°C | 20.9°C | -6.7°C | 94 mm | 83% | 1.9 m/s | 2.8 |
| 1984 | 17.0°C | 12.4°C | 7.7°C | 23.6°C | -4.3°C | 93 mm | 89% | 2.1 m/s | 2.1 |
| 1983 ❄️ | 7.8°C | 2.8°C | -2.3°C | 23.1°C | -14.6°C | 112 mm | 81% | 2.2 m/s | — |
| 1982 | 13.8°C | 9.1°C | 4.4°C | 25.2°C | -5.9°C | 214 mm | 87% | 2.2 m/s | — |
| 1981 | 13.5°C | 7.5°C | 1.6°C | 22.7°C | -6.5°C | 10 mm | 78% | 2.2 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 14°C with lows near 3.2°C (mean 8.6°C), based on 45 years of NASA POWER data.
December averages 111 mm of rainfall in Tyler, a relatively wet time of year. The wettest on record was 252 mm in 1987.
The hottest December reached 27.1°C in 2021. The coldest dipped to -16.5°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°C. Daytime highs moved from 12.6°C to 17.2°C and overnight lows from 2.3°C to 5.9°C over the same span.
December is one of the cooler months of the year in Tyler and a relatively wet time of year, so plan for around 14°C daytime highs and 3.2°C at night.
Not quite — December is the 2nd coolest month in Tyler, averaging 8.6°C.
For December in Tyler, pack warm layers and a jacket for chilly mornings, with typical highs of 14°C and lows of 3.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 81% — quite humid.
Average wind speed in December is 2 m/s. The windiest December on record averaged 2.4 m/s (2008).
The wettest December on record was 1987 with 252 mm. On average, December sees 111 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 Tyler 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.
