December is one of the warmer months of the year in Wyndham, with average highs near 36.6°C and lows around 26.6°C (mean 31.6°C). It is a relatively wet time of year, averaging 170 mm of rainfall and 62% relative humidity across the period.
December is one of the warmer months of the year in Wyndham. Across 45 years of records, the warmest December in Wyndham was 2023 — when the month averaged 35.5°C — while the coldest was 1988 at 29°C. Typical December days reach 36.6°C with nights near 26.6°C. The long-term December temperature trend is broadly flat.
December is a relatively wet time of year in Wyndham, averaging 170 mm of rainfall. The wettest December on record was 2008 with 550 mm, while the driest was 1983 at 33 mm.
Relative humidity in Wyndham during December averages 62%. The most humid December was 1998 at 76%, and the least humid was 1991 at 45%.
December receives about 6.5 kWh/m²/day of solar energy in Wyndham. The sunniest December was 1986 at 7.6 kWh/m²/day, and the cloudiest were 1996 and 2020 at 5.6.
Average wind speed in Wyndham during December is 2.6 m/s. The windiest Decembers were 1990, 1992 and 2000, among others at 3.1 m/s, while the calmest were 1997 and 2012 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 32.0°C | 31.2°C | 31.2°C | 31.7°C | 32.4°C | +0.4°C |
| Avg High | 37.5°C | 36.0°C | 36.0°C | 36.5°C | 37.7°C | +0.2°C |
| Avg Low | 26.6°C | 26.3°C | 26.4°C | 26.9°C | 27.2°C | +0.6°C |
| Avg Rain | 126 mm | 175 mm | 219 mm | 184 mm | 125 mm | 0 mm |
December temperatures in Wyndham have risen by about 0.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 20.7°C (1990) to a record high of 46.9°C (2023).
Rainfall in December is a relatively wet time of year, averaging 170 mm, with a wettest year of 550 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
A quieter season to visit Wyndham
If your dates are flexible, the more temperate months of July and June tend to be the most comfortable for visiting Wyndham. That said, December — with days averaging 36.6°C and nights around 26.6°C (mean 31.6°C) and higher rainfall (170 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 37.5°C | 32.0°C | 26.6°C | 42.4°C | 22.8°C | 66 mm | 59% | 2.7 m/s | — |
| 2024 | 38.1°C | 32.9°C | 27.8°C | 42.8°C | 25.9°C | 100 mm | 63% | 2.6 m/s | 6.5 |
| 2023 🔥 | 41.7°C | 35.5°C | 29.3°C | 46.9°C | 27.1°C | 58 mm | 49% | 2.8 m/s | 6.9 |
| 2022 | 35.5°C | 30.7°C | 25.8°C | 41.9°C | 20.7°C | 211 mm | 66% | 2.5 m/s | 6.4 |
| 2021 | 39.3°C | 33.6°C | 28.0°C | 44.1°C | 25.0°C | 88 mm | 53% | 2.8 m/s | 7.1 |
| 2020 | 33.8°C | 29.8°C | 25.8°C | 40.0°C | 21.2°C | 229 mm | 73% | 2.5 m/s | 5.6 |
| 2019 | 41.0°C | 34.8°C | 28.5°C | 44.8°C | 26.6°C | 87 mm | 49% | 2.6 m/s | 7.1 |
| 2018 | 40.5°C | 34.4°C | 28.3°C | 46.8°C | 25.7°C | 88 mm | 52% | 2.6 m/s | 7 |
| 2017 | 37.3°C | 32.1°C | 26.8°C | 42.8°C | 24.2°C | 115 mm | 60% | 2.4 m/s | 6.9 |
| 2016 | 35.6°C | 31.3°C | 27.1°C | 43.2°C | 24.8°C | 265 mm | 66% | 3 m/s | 5.8 |
| 2015 | 35.4°C | 31.0°C | 26.7°C | 41.1°C | 24.6°C | 254 mm | 66% | 2.6 m/s | 6.2 |
| 2014 | 35.3°C | 31.1°C | 27.0°C | 39.2°C | 24.9°C | 221 mm | 66% | 2.3 m/s | 6.2 |
| 2013 | 33.8°C | 29.8°C | 25.9°C | 39.2°C | 23.1°C | 278 mm | 72% | 2.2 m/s | 6.1 |
| 2012 | 35.3°C | 30.8°C | 26.3°C | 41.2°C | 25.3°C | 162 mm | 66% | 1.9 m/s | 6.7 |
| 2011 | 36.1°C | 31.4°C | 26.7°C | 40.8°C | 24.8°C | 147 mm | 64% | 2 m/s | 6.7 |
| 2010 | 34.5°C | 30.2°C | 25.9°C | 42.0°C | 23.9°C | 225 mm | 68% | 2.4 m/s | 6.2 |
| 2009 | 36.9°C | 31.7°C | 26.5°C | 43.7°C | 23.8°C | 153 mm | 61% | 2.8 m/s | 6.2 |
| 2008 🌧️ | 33.3°C | 29.5°C | 25.6°C | 41.3°C | 23.3°C | 550 mm | 74% | 3 m/s | 5.7 |
| 2007 | 36.3°C | 31.5°C | 26.8°C | 44.5°C | 24.5°C | 157 mm | 63% | 2.2 m/s | 6.3 |
| 2006 | 36.9°C | 31.9°C | 27.0°C | 43.3°C | 23.0°C | 114 mm | 57% | 2.4 m/s | 6.6 |
| 2005 | 35.7°C | 31.3°C | 26.8°C | 41.6°C | 24.9°C | 211 mm | 66% | 2.3 m/s | 6.2 |
| 2004 | 38.3°C | 32.5°C | 26.7°C | 43.1°C | 22.6°C | 152 mm | 57% | 2.4 m/s | 6.9 |
| 2003 | 34.6°C | 30.5°C | 26.3°C | 40.1°C | 22.9°C | 289 mm | 70% | 2.5 m/s | 6.2 |
| 2002 | 38.8°C | 33.1°C | 27.3°C | 43.2°C | 24.2°C | 78 mm | 55% | 2.2 m/s | 7.1 |
| 2001 | 34.9°C | 30.3°C | 25.6°C | 39.8°C | 23.9°C | 225 mm | 68% | 2.2 m/s | 6.7 |
| 2000 | 34.5°C | 29.9°C | 25.3°C | 38.5°C | 23.4°C | 264 mm | 71% | 3.1 m/s | 6.2 |
| 1999 | 33.5°C | 29.7°C | 25.8°C | 39.0°C | 23.9°C | 202 mm | 72% | 2.2 m/s | 6.4 |
| 1998 | 32.7°C | 29.1°C | 25.5°C | 39.5°C | 23.8°C | 284 mm | 76% | 2.3 m/s | 6 |
| 1997 | 35.3°C | 30.8°C | 26.4°C | 41.6°C | 23.9°C | 181 mm | 66% | 1.9 m/s | 6.4 |
| 1996 | 33.7°C | 29.9°C | 26.1°C | 42.6°C | 24.1°C | 329 mm | 73% | 2.5 m/s | 5.6 |
| 1995 | 34.9°C | 30.5°C | 26.1°C | 41.8°C | 23.7°C | 120 mm | 67% | 2.5 m/s | 6.6 |
| 1994 | 34.8°C | 30.3°C | 25.7°C | 39.2°C | 23.4°C | 168 mm | 68% | 2.1 m/s | 7 |
| 1993 | 35.9°C | 31.1°C | 26.3°C | 41.7°C | 22.9°C | 194 mm | 65% | 2.6 m/s | 6.1 |
| 1992 | 41.2°C | 34.5°C | 27.8°C | 43.7°C | 25.9°C | 59 mm | 49% | 3.1 m/s | 7.3 |
| 1991 | 41.4°C | 34.6°C | 27.7°C | 43.5°C | 25.4°C | 53 mm | 45% | 2.9 m/s | 7.5 |
| 1990 | 36.3°C | 31.0°C | 25.6°C | 41.4°C | 20.7°C | 158 mm | 63% | 3.1 m/s | 6.6 |
| 1989 | 38.9°C | 32.8°C | 26.7°C | 42.4°C | 22.9°C | 130 mm | 55% | 2.4 m/s | 7.3 |
| 1988 ❄️ | 33.1°C | 29.0°C | 25.0°C | 38.9°C | 23.5°C | 243 mm | 75% | 2.7 m/s | 6.3 |
| 1987 | 36.1°C | 31.1°C | 26.2°C | 41.1°C | 22.1°C | 235 mm | 64% | 3.1 m/s | 6.6 |
| 1986 | 40.3°C | 34.1°C | 27.8°C | 42.9°C | 25.9°C | 56 mm | 49% | 3 m/s | 7.6 |
| 1985 | 39.4°C | 33.7°C | 28.0°C | 44.0°C | 24.6°C | 69 mm | 50% | 2.9 m/s | 7.2 |
| 1984 | 36.9°C | 31.7°C | 26.6°C | 44.7°C | 24.2°C | 139 mm | 59% | 3 m/s | 6.5 |
| 1983 | 39.1°C | 32.9°C | 26.7°C | 43.3°C | 22.8°C | 33 mm | 49% | 2.7 m/s | — |
| 1982 | 37.9°C | 32.2°C | 26.5°C | 42.1°C | 24.8°C | 106 mm | 57% | 2.4 m/s | — |
| 1981 | 36.2°C | 30.9°C | 25.7°C | 41.4°C | 22.1°C | 120 mm | 64% | 2.5 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 36.6°C with lows near 26.6°C (mean 31.6°C), based on 45 years of NASA POWER data.
December averages 170 mm of rainfall in Wyndham, a relatively wet time of year. The wettest on record was 550 mm in 2008.
The hottest December reached 46.9°C in 2023. The coldest dipped to 20.7°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.6°C. Daytime highs moved from 37.9°C to 38.4°C and overnight lows from 26.7°C to 27.5°C over the same span.
December is one of the warmer months of the year in Wyndham and a relatively wet time of year, so plan for around 36.6°C daytime highs and 26.6°C at night.
Not quite — December is the 10th coolest month in Wyndham, averaging 31.6°C.
For December in Wyndham, pack light, breathable clothing and sun protection, with typical highs of 36.6°C and lows of 26.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 62% — moderately humid.
Average wind speed in December is 2.6 m/s. The windiest December on record averaged 3.1 m/s (1987).
The wettest December on record was 2008 with 550 mm. On average, December sees 170 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 Wyndham 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.
