December is one of the cooler months of the year in Amarillo, with average highs near 10.9°C and lows around -2.3°C (mean 4.3°C). It is one of the drier months, averaging 17 mm of rainfall and 59% relative humidity across the period.
December is one of the cooler months of the year in Amarillo. Across 45 years of records, the warmest December in Amarillo was 2021 — when the month averaged 9.8°C — while the coldest was 1983 at -0.5°C. Typical December days reach 10.9°C with nights near -2.3°C. The long-term trend is warming, about 0.8°C per decade.
December is one of the drier months in Amarillo, averaging 17 mm of rainfall. The wettest December on record was 1991 with 74 mm, while the driest was 2017 at 0 mm.
Relative humidity in Amarillo during December averages 59%. The most humid December was 1986 at 74%, and the least humid was 2021 at 40%.
December receives about 2.7 kWh/m²/day of solar energy in Amarillo. The sunniest Decembers were 2001, 2004 and 2021, among others at 3 kWh/m²/day, and the cloudiest were 1984 and 1992 at 2.2.
Average wind speed in Amarillo during December is 3.4 m/s. The windiest December was 2021 at 4.2 m/s, while the calmest was 1986 at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 2.9°C | 4.0°C | 3.9°C | 4.5°C | 7.1°C | +4.2°C |
| Avg High | 9.2°C | 10.6°C | 10.4°C | 11.1°C | 14.3°C | +5.1°C |
| Avg Low | -3.3°C | -2.6°C | -2.7°C | -2.0°C | -0.1°C | +3.2°C |
| Avg Rain | 19 mm | 24 mm | 18 mm | 13 mm | 10 mm | -8 mm |
December temperatures in Amarillo have risen by about 4.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -17.5°C (1983) to a record high of 25.8°C (2025).
Rainfall in December is one of the drier months, averaging 17 mm, with a wettest year of 74 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 Amarillo
If your dates are flexible, the more temperate months of September and May tend to be the most comfortable for visiting Amarillo. That said, December — with days averaging 10.9°C and nights around -2.3°C (mean 4.3°C) and low rainfall (17 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 | 16.5°C | 8.6°C | 0.6°C | 25.8°C | -6.2°C | 2 mm | 49% | 3.4 m/s | — |
| 2024 | 14.2°C | 7.4°C | 0.5°C | 20.1°C | -3.6°C | 0 mm | 59% | 3.1 m/s | 2.9 |
| 2023 | 13.6°C | 6.7°C | -0.3°C | 22.7°C | -5.4°C | 48 mm | 57% | 3.3 m/s | 2.8 |
| 2022 | 12.1°C | 5.3°C | -1.5°C | 22.7°C | -16.0°C | 6 mm | 54% | 3.7 m/s | 2.9 |
| 2021 🔥 | 17.3°C | 9.8°C | 2.4°C | 24.3°C | -4.6°C | 1 mm | 40% | 4.2 m/s | 3 |
| 2020 | 11.8°C | 4.6°C | -2.5°C | 20.0°C | -6.3°C | 5 mm | 50% | 3.4 m/s | 2.9 |
| 2019 | 12.6°C | 5.8°C | -0.9°C | 19.6°C | -6.2°C | 21 mm | 57% | 3.3 m/s | 2.8 |
| 2018 | 10.3°C | 4.1°C | -2.0°C | 17.7°C | -7.4°C | 15 mm | 60% | 3.4 m/s | 2.6 |
| 2017 | 11.2°C | 4.3°C | -2.6°C | 23.1°C | -10.3°C | 0 mm | 56% | 3.4 m/s | 2.8 |
| 2016 | 10.9°C | 4.2°C | -2.6°C | 20.2°C | -12.2°C | 9 mm | 55% | 3.9 m/s | 2.7 |
| 2015 | 11.9°C | 5.3°C | -1.3°C | 21.7°C | -6.1°C | 16 mm | 61% | 3.8 m/s | 2.6 |
| 2014 | 10.8°C | 4.9°C | -1.0°C | 20.3°C | -12.4°C | 3 mm | 66% | 3.3 m/s | 2.4 |
| 2013 | 9.7°C | 3.0°C | -3.7°C | 22.1°C | -11.8°C | 7 mm | 56% | 3.4 m/s | 2.8 |
| 2012 | 12.4°C | 5.6°C | -1.3°C | 23.4°C | -8.4°C | 14 mm | 47% | 3.8 m/s | 2.7 |
| 2011 | 8.2°C | 2.5°C | -3.3°C | 21.7°C | -8.1°C | 39 mm | 71% | 3.3 m/s | 2.3 |
| 2010 | 12.8°C | 5.8°C | -1.1°C | 22.8°C | -5.4°C | 4 mm | 55% | 3.5 m/s | 2.6 |
| 2009 | 7.3°C | 1.4°C | -4.5°C | 17.7°C | -12.0°C | 9 mm | 60% | 3.2 m/s | 2.6 |
| 2008 | 11.7°C | 4.5°C | -2.7°C | 22.7°C | -10.0°C | 2 mm | 52% | 4.1 m/s | 2.7 |
| 2007 | 10.1°C | 3.8°C | -2.4°C | 22.8°C | -6.5°C | 29 mm | 58% | 3.6 m/s | 2.6 |
| 2006 | 9.7°C | 3.4°C | -3.0°C | 20.7°C | -8.3°C | 61 mm | 66% | 3.2 m/s | 2.8 |
| 2005 | 11.5°C | 4.6°C | -2.3°C | 22.2°C | -15.1°C | 1 mm | 51% | 3.3 m/s | 2.7 |
| 2004 | 11.6°C | 4.9°C | -1.8°C | 19.5°C | -10.7°C | 10 mm | 63% | 3.4 m/s | 3 |
| 2003 | 12.9°C | 5.8°C | -1.4°C | 21.8°C | -5.8°C | 2 mm | 47% | 3.8 m/s | 2.9 |
| 2002 | 10.5°C | 4.0°C | -2.6°C | 19.6°C | -8.0°C | 25 mm | 63% | 3.3 m/s | 2.6 |
| 2001 | 11.8°C | 5.0°C | -1.9°C | 20.4°C | -6.5°C | 14 mm | 54% | 3.3 m/s | 3 |
| 2000 | 7.2°C | 1.3°C | -4.5°C | 17.3°C | -9.1°C | 29 mm | 65% | 3.4 m/s | 2.6 |
| 1999 | 11.2°C | 4.3°C | -2.5°C | 19.2°C | -9.0°C | 28 mm | 55% | 3.5 m/s | 2.7 |
| 1998 | 10.7°C | 3.8°C | -3.0°C | 21.0°C | -13.2°C | 12 mm | 65% | 2.9 m/s | 2.8 |
| 1997 | 6.6°C | 1.0°C | -4.6°C | 17.8°C | -12.6°C | 52 mm | 74% | 3.5 m/s | 2.7 |
| 1996 | 12.4°C | 5.2°C | -2.1°C | 23.0°C | -14.2°C | 6 mm | 50% | 3.8 m/s | 2.7 |
| 1995 | 11.4°C | 4.7°C | -2.0°C | 23.1°C | -9.5°C | 23 mm | 57% | 3.2 m/s | 2.7 |
| 1994 | 13.0°C | 6.3°C | -0.5°C | 21.1°C | -7.4°C | 10 mm | 59% | 2.9 m/s | 2.7 |
| 1993 | 11.7°C | 4.7°C | -2.4°C | 20.4°C | -6.6°C | 14 mm | 52% | 3.8 m/s | 2.9 |
| 1992 | 9.2°C | 3.3°C | -2.7°C | 22.1°C | -7.8°C | 21 mm | 64% | 3.5 m/s | 2.2 |
| 1991 🌧️ | 9.3°C | 3.5°C | -2.2°C | 19.3°C | -6.6°C | 74 mm | 69% | 3.1 m/s | 2.5 |
| 1990 | 10.6°C | 3.3°C | -4.0°C | 18.7°C | -11.5°C | 4 mm | 53% | 3.5 m/s | 2.9 |
| 1989 | 7.4°C | 0.9°C | -5.6°C | 20.2°C | -17.2°C | 10 mm | 58% | 3.1 m/s | 3 |
| 1988 | 11.2°C | 4.4°C | -2.4°C | 17.9°C | -6.4°C | 6 mm | 51% | 3.5 m/s | 2.9 |
| 1987 | 9.1°C | 2.6°C | -3.8°C | 22.2°C | -17.5°C | 43 mm | 66% | 3.3 m/s | 2.4 |
| 1986 | 8.6°C | 3.2°C | -2.3°C | 14.4°C | -6.0°C | 26 mm | 74% | 2.7 m/s | 2.5 |
| 1985 | 9.1°C | 2.8°C | -3.5°C | 18.1°C | -8.8°C | 6 mm | 64% | 3 m/s | 2.9 |
| 1984 | 10.6°C | 4.8°C | -0.9°C | 19.2°C | -6.1°C | 35 mm | 69% | 3.7 m/s | 2.2 |
| 1983 ❄️ | 5.7°C | -0.5°C | -6.6°C | 18.6°C | -17.5°C | 14 mm | 65% | 3.6 m/s | — |
| 1982 | 8.6°C | 2.8°C | -3.0°C | 20.0°C | -11.8°C | 29 mm | 65% | 3.7 m/s | — |
| 1981 | 12.2°C | 5.3°C | -1.5°C | 20.7°C | -7.5°C | 1 mm | 57% | 3.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 10.9°C with lows near -2.3°C (mean 4.3°C), based on 45 years of NASA POWER data.
December averages 17 mm of rainfall in Amarillo, one of the drier months. The wettest on record was 74 mm in 1991.
The hottest December reached 25.8°C in 2025. The coldest dipped to -17.5°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 4.6°C. Daytime highs moved from 9.2°C to 14.7°C and overnight lows from -3.1°C to 0.3°C over the same span.
December is one of the cooler months of the year in Amarillo and one of the drier months, so plan for around 10.9°C daytime highs and -2.3°C at night.
Not quite — December is the 2nd coolest month in Amarillo, averaging 4.3°C.
For December in Amarillo, pack warm layers and a jacket for chilly mornings, with typical highs of 10.9°C and lows of -2.3°C.
Relative humidity in December averages 59% — moderately humid.
Average wind speed in December is 3.4 m/s. The windiest December on record averaged 4.2 m/s (2021).
The wettest December on record was 1991 with 74 mm. On average, December sees 17 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 Amarillo 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.
