December is one of the cooler months of the year in Leander, with average highs near 16.6°C and lows around 4.2°C (mean 10.4°C). It is one of the drier months, averaging 50 mm of rainfall and 71% relative humidity across the period.
December is one of the cooler months of the year in Leander. Across 45 years of records, the warmest December in Leander was 2021 — when the month averaged 17°C — while the coldest was 1983 at 5.1°C. Typical December days reach 16.6°C with nights near 4.2°C. The long-term trend is warming, about 0.8°C per decade.
December is one of the drier months in Leander, averaging 50 mm of rainfall. The wettest December on record was 1991 with 300 mm, while the driest was 2005 at 2 mm.
Relative humidity in Leander during December averages 71%. The most humid December was 1986 at 85%, and the least humid was 2005 at 54%.
December receives about 2.7 kWh/m²/day of solar energy in Leander. The sunniest Decembers were 2003, 2019 and 2023, among others at 3.2 kWh/m²/day, and the cloudiest was 1992 at 1.9.
Average wind speed in Leander during December is 2.9 m/s. The windiest December was 2008 at 3.5 m/s, while the calmest were 1986 and 1994 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.0°C | 10.3°C | 9.8°C | 10.7°C | 13.3°C | +4.3°C |
| Avg High | 15.0°C | 16.5°C | 16.3°C | 16.7°C | 19.8°C | +4.8°C |
| Avg Low | 2.9°C | 4.3°C | 3.3°C | 4.7°C | 6.7°C | +3.8°C |
| Avg Rain | 49 mm | 77 mm | 31 mm | 52 mm | 38 mm | -11 mm |
December temperatures in Leander have risen by about 4.4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -16.7°C (1989) to a record high of 30.4°C (2024).
Rainfall in December is one of the drier months, averaging 50 mm, with a wettest year of 300 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 Leander
If your dates are flexible, the more temperate months of October and April tend to be the most comfortable for visiting Leander. That said, December — with days averaging 16.6°C and nights around 4.2°C (mean 10.4°C) and moderate rainfall (50 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 | 20.3°C | 13.3°C | 6.3°C | 29.7°C | -1.5°C | 7 mm | 65% | 2.7 m/s | — |
| 2024 | 21.0°C | 14.4°C | 7.8°C | 30.4°C | 1.2°C | 36 mm | 69% | 2.6 m/s | 2.8 |
| 2023 | 19.4°C | 12.8°C | 6.1°C | 25.7°C | -0.3°C | 52 mm | 68% | 2.5 m/s | 3.2 |
| 2022 | 16.8°C | 11.1°C | 5.4°C | 26.0°C | -10.3°C | 36 mm | 74% | 2.6 m/s | 2.4 |
| 2021 🔥 | 23.2°C | 17.0°C | 10.9°C | 28.5°C | 0.3°C | 29 mm | 75% | 2.7 m/s | 2.6 |
| 2020 | 18.4°C | 10.9°C | 3.5°C | 26.2°C | -1.8°C | 69 mm | 64% | 3 m/s | 3 |
| 2019 | 18.7°C | 11.6°C | 4.5°C | 26.5°C | -2.1°C | 20 mm | 66% | 2.5 m/s | 3.2 |
| 2018 | 14.9°C | 9.7°C | 4.4°C | 23.3°C | -1.5°C | 131 mm | 77% | 3 m/s | 2.7 |
| 2017 | 15.9°C | 10.1°C | 4.4°C | 28.1°C | -4.1°C | 77 mm | 70% | 2.6 m/s | 2.4 |
| 2016 | 16.0°C | 10.6°C | 5.3°C | 25.9°C | -6.9°C | 71 mm | 77% | 3 m/s | 2.1 |
| 2015 | 18.3°C | 12.1°C | 5.9°C | 25.3°C | -1.7°C | 67 mm | 79% | 2.7 m/s | 2.9 |
| 2014 | 16.2°C | 11.3°C | 6.3°C | 24.4°C | -1.1°C | 19 mm | 78% | 2.8 m/s | 2.1 |
| 2013 | 14.1°C | 8.0°C | 1.9°C | 26.2°C | -5.4°C | 25 mm | 75% | 2.6 m/s | 2.6 |
| 2012 | 19.5°C | 12.7°C | 6.0°C | 27.8°C | -5.1°C | 7 mm | 58% | 3.1 m/s | 2.9 |
| 2011 | 15.2°C | 9.8°C | 4.3°C | 23.3°C | -5.4°C | 85 mm | 77% | 3 m/s | 2.1 |
| 2010 | 18.1°C | 10.9°C | 3.6°C | 28.1°C | -4.8°C | 21 mm | 58% | 3.2 m/s | 3.1 |
| 2009 | 12.2°C | 6.9°C | 1.5°C | 21.4°C | -5.3°C | 42 mm | 79% | 2.6 m/s | 2.5 |
| 2008 | 18.2°C | 10.9°C | 3.7°C | 26.6°C | -2.2°C | 6 mm | 54% | 3.5 m/s | 2.7 |
| 2007 | 18.5°C | 11.1°C | 3.7°C | 26.8°C | -4.0°C | 12 mm | 67% | 3.1 m/s | 3.1 |
| 2006 | 17.6°C | 11.1°C | 4.7°C | 25.4°C | -4.4°C | 37 mm | 67% | 2.9 m/s | 2.8 |
| 2005 | 17.5°C | 10.5°C | 3.6°C | 28.5°C | -5.1°C | 2 mm | 54% | 2.8 m/s | 3 |
| 2004 | 15.6°C | 9.5°C | 3.4°C | 22.9°C | -5.9°C | 13 mm | 75% | 2.8 m/s | 3.1 |
| 2003 | 18.2°C | 11.1°C | 4.0°C | 24.0°C | -2.9°C | 7 mm | 62% | 3.4 m/s | 3.2 |
| 2002 | 16.1°C | 10.0°C | 3.9°C | 22.6°C | -3.1°C | 84 mm | 78% | 3 m/s | 2.7 |
| 2001 | 16.7°C | 10.7°C | 4.6°C | 24.6°C | -3.2°C | 60 mm | 75% | 2.8 m/s | 2.8 |
| 2000 | 12.0°C | 6.0°C | 0.1°C | 21.6°C | -5.2°C | 41 mm | 79% | 2.9 m/s | 2.5 |
| 1999 | 18.7°C | 11.3°C | 3.9°C | 27.1°C | -3.0°C | 33 mm | 59% | 3.2 m/s | 3.1 |
| 1998 | 15.3°C | 9.7°C | 4.2°C | 25.2°C | -4.8°C | 49 mm | 78% | 3 m/s | 2.5 |
| 1997 | 15.4°C | 8.7°C | 2.1°C | 24.2°C | -4.9°C | 89 mm | 70% | 3 m/s | 3 |
| 1996 | 16.9°C | 10.3°C | 3.7°C | 25.8°C | -7.0°C | 65 mm | 76% | 3 m/s | 2.9 |
| 1995 | 17.5°C | 11.0°C | 4.5°C | 27.0°C | -6.2°C | 23 mm | 69% | 2.9 m/s | 2.8 |
| 1994 | 16.9°C | 11.3°C | 5.8°C | 25.1°C | -0.2°C | 96 mm | 80% | 2.2 m/s | 2.3 |
| 1993 | 16.1°C | 10.2°C | 4.4°C | 23.9°C | -3.8°C | 32 mm | 71% | 2.9 m/s | 2.4 |
| 1992 | 15.7°C | 10.2°C | 4.8°C | 24.0°C | -0.8°C | 68 mm | 81% | 2.9 m/s | 1.9 |
| 1991 🌧️ | 15.4°C | 10.7°C | 6.1°C | 23.1°C | -1.2°C | 300 mm | 82% | 2.9 m/s | 2.1 |
| 1990 | 16.6°C | 9.8°C | 3.0°C | 25.8°C | -8.0°C | 10 mm | 68% | 3.1 m/s | 2.8 |
| 1989 | 12.0°C | 5.2°C | -1.7°C | 25.2°C | -16.7°C | 5 mm | 61% | 3.2 m/s | 3.1 |
| 1988 | 17.5°C | 11.1°C | 4.8°C | 24.6°C | -2.7°C | 30 mm | 65% | 2.8 m/s | 2.6 |
| 1987 | 16.0°C | 9.8°C | 3.7°C | 25.1°C | -4.3°C | 56 mm | 73% | 3 m/s | 2.5 |
| 1986 | 12.9°C | 8.1°C | 3.2°C | 20.7°C | -2.3°C | 138 mm | 85% | 2.2 m/s | 2.3 |
| 1985 | 14.1°C | 7.7°C | 1.3°C | 22.5°C | -6.6°C | 36 mm | 77% | 2.8 m/s | 3.2 |
| 1984 | 18.9°C | 13.7°C | 8.5°C | 23.5°C | -3.4°C | 105 mm | 83% | 3 m/s | 2.1 |
| 1983 ❄️ | 11.3°C | 5.1°C | -1.2°C | 25.8°C | -13.1°C | 9 mm | 65% | 3.2 m/s | — |
| 1982 | 15.4°C | 9.6°C | 3.7°C | 25.5°C | -4.3°C | 58 mm | 74% | 3.2 m/s | — |
| 1981 | 17.1°C | 10.4°C | 3.8°C | 26.5°C | -5.6°C | 7 mm | 69% | 2.9 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 16.6°C with lows near 4.2°C (mean 10.4°C), based on 45 years of NASA POWER data.
December averages 50 mm of rainfall in Leander, one of the drier months. The wettest on record was 300 mm in 1991.
The hottest December reached 30.4°C in 2024. The coldest dipped to -16.7°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 15.4°C to 20.1°C and overnight lows from 3.2°C to 7.3°C over the same span.
December is one of the cooler months of the year in Leander and one of the drier months, so plan for around 16.6°C daytime highs and 4.2°C at night.
Not quite — December is the 2nd coolest month in Leander, averaging 10.4°C.
For December in Leander, pack warm layers and a jacket for chilly mornings, with typical highs of 16.6°C and lows of 4.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 71% — moderately humid.
Average wind speed in December is 2.9 m/s. The windiest December on record averaged 3.5 m/s (2008).
The wettest December on record was 1991 with 300 mm. On average, December sees 50 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 Leander 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.
