December is one of the warmer months of the year in Goondiwindi, with average highs near 34.4°C and lows around 19°C (mean 26.7°C). It is a relatively wet time of year, averaging 67 mm of rainfall and 50% relative humidity across the period.
December is one of the warmer months of the year in Goondiwindi. Across 45 years of records, the warmest December in Goondiwindi was 1990 — when the month averaged 29.9°C — while the coldest was 2011 at 23.1°C. Typical December days reach 34.4°C with nights near 19°C. The long-term trend is warming, about 0.3°C per decade.
December is a relatively wet time of year in Goondiwindi, averaging 67 mm of rainfall. The wettest December on record was 2004 with 140 mm, while the driest was 2019 at 11 mm.
Relative humidity in Goondiwindi during December averages 50%. The most humid December was 2010 at 70%, and the least humid was 2019 at 32%.
December receives about 7.6 kWh/m²/day of solar energy in Goondiwindi. The sunniest December was 2019 at 8.4 kWh/m²/day, and the cloudiest was 2010 at 6.
Average wind speed in Goondiwindi during December is 3.1 m/s. The windiest December was 1988 at 3.8 m/s, while the calmest was 2000 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 26.4°C | 26.3°C | 26.8°C | 27.1°C | 27.0°C | +0.6°C |
| Avg High | 34.5°C | 34.0°C | 34.4°C | 34.6°C | 34.5°C | 0°C |
| Avg Low | 18.4°C | 18.5°C | 19.3°C | 19.6°C | 19.5°C | +1.1°C |
| Avg Rain | 55 mm | 80 mm | 76 mm | 62 mm | 59 mm | +4 mm |
December temperatures in Goondiwindi have risen by about 0.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 8.9°C (2004) to a record high of 45.7°C (1990).
Rainfall in December is a relatively wet time of year, averaging 67 mm, with a wettest year of 140 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.1°C per decade while lows rose 0.4°C per decade, narrowing the gap between day and night.
A good time to visit Goondiwindi
December is a good time to visit Goondiwindi, with days averaging 34.4°C and nights around 19°C (mean 26.7°C, warmer than Goondiwindi's yearly average) and moderate rainfall. October and April are marginally more temperate, but December still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 35.7°C | 27.8°C | 19.8°C | 41.3°C | 11.2°C | 43 mm | 44% | 2.8 m/s | — |
| 2024 | 35.9°C | 28.4°C | 20.9°C | 40.9°C | 15.1°C | 38 mm | 53% | 2.7 m/s | 7.9 |
| 2023 | 36.1°C | 28.5°C | 20.9°C | 40.9°C | 17.5°C | 76 mm | 52% | 2.7 m/s | 7.7 |
| 2022 | 32.3°C | 24.3°C | 16.4°C | 38.8°C | 10.8°C | 53 mm | 49% | 2.7 m/s | 7.7 |
| 2021 | 33.0°C | 25.8°C | 18.7°C | 37.6°C | 12.7°C | 38 mm | 59% | 2.6 m/s | 7.7 |
| 2020 | 33.9°C | 27.1°C | 20.3°C | 45.4°C | 13.1°C | 106 mm | 54% | 3.2 m/s | 6.7 |
| 2019 | 38.2°C | 29.3°C | 20.5°C | 45.3°C | 12.2°C | 11 mm | 32% | 3.2 m/s | 8.4 |
| 2018 | 36.4°C | 28.1°C | 19.8°C | 43.9°C | 15.9°C | 31 mm | 42% | 3.3 m/s | 8.2 |
| 2017 | 35.8°C | 27.9°C | 20.0°C | 42.4°C | 12.6°C | 55 mm | 48% | 2.9 m/s | 7.8 |
| 2016 | 36.7°C | 28.8°C | 20.8°C | 43.7°C | 14.3°C | 50 mm | 46% | 3.3 m/s | 7.7 |
| 2015 | 34.4°C | 27.2°C | 20.0°C | 41.4°C | 15.7°C | 52 mm | 48% | 3 m/s | 7.4 |
| 2014 | 34.9°C | 27.6°C | 20.3°C | 40.9°C | 15.4°C | 97 mm | 51% | 3.1 m/s | 6.7 |
| 2013 | 35.7°C | 27.2°C | 18.6°C | 45.0°C | 10.4°C | 15 mm | 41% | 2.9 m/s | 8.2 |
| 2012 | 35.6°C | 28.1°C | 20.7°C | 42.6°C | 14.1°C | 79 mm | 45% | 2.8 m/s | 7.7 |
| 2011 ❄️ | 29.2°C | 23.1°C | 17.0°C | 33.6°C | 13.1°C | 122 mm | 66% | 2.7 m/s | 6.8 |
| 2010 | 29.5°C | 23.7°C | 17.9°C | 35.0°C | 9.3°C | 105 mm | 70% | 2.9 m/s | 6 |
| 2009 | 35.6°C | 28.4°C | 21.3°C | 43.0°C | 17.7°C | 94 mm | 43% | 3.2 m/s | 6.8 |
| 2008 | 34.6°C | 26.8°C | 19.1°C | 38.4°C | 12.9°C | 79 mm | 52% | 3.2 m/s | 7.4 |
| 2007 | 31.7°C | 25.3°C | 18.8°C | 36.7°C | 13.2°C | 115 mm | 64% | 3.1 m/s | 6.8 |
| 2006 | 34.2°C | 26.7°C | 19.1°C | 39.0°C | 14.7°C | 17 mm | 42% | 3.4 m/s | 7.1 |
| 2005 | 36.6°C | 28.0°C | 19.5°C | 43.2°C | 11.8°C | 65 mm | 46% | 3.1 m/s | 8.2 |
| 2004 🌧️ | 32.4°C | 25.4°C | 18.5°C | 39.6°C | 8.9°C | 140 mm | 59% | 3.2 m/s | 7.5 |
| 2003 | 34.6°C | 27.1°C | 19.6°C | 42.0°C | 13.9°C | 106 mm | 54% | 3 m/s | 7.7 |
| 2002 | 34.4°C | 26.4°C | 18.5°C | 41.7°C | 12.1°C | 69 mm | 46% | 3.2 m/s | 7.8 |
| 2001 | 36.0°C | 27.6°C | 19.3°C | 42.0°C | 14.5°C | 43 mm | 44% | 3.1 m/s | 7.4 |
| 2000 | 33.9°C | 26.7°C | 19.4°C | 38.9°C | 14.2°C | 33 mm | 53% | 2.5 m/s | 7.6 |
| 1999 | 30.8°C | 23.7°C | 16.7°C | 36.9°C | 13.1°C | 86 mm | 56% | 3.1 m/s | 7.3 |
| 1998 | 34.7°C | 26.7°C | 18.7°C | 40.6°C | 14.0°C | 37 mm | 49% | 2.7 m/s | 7.8 |
| 1997 | 35.6°C | 28.2°C | 20.9°C | 41.5°C | 16.3°C | 124 mm | 53% | 2.9 m/s | 7.8 |
| 1996 | 33.9°C | 26.1°C | 18.3°C | 41.6°C | 13.7°C | 101 mm | 52% | 3.2 m/s | 7.6 |
| 1995 | 32.1°C | 24.4°C | 16.6°C | 38.9°C | 9.7°C | 89 mm | 57% | 3.1 m/s | 7.5 |
| 1994 | 35.1°C | 26.8°C | 18.5°C | 41.6°C | 13.7°C | 60 mm | 47% | 3 m/s | 8.1 |
| 1993 | 33.0°C | 25.4°C | 17.7°C | 41.2°C | 9.8°C | 83 mm | 49% | 3.4 m/s | 7.8 |
| 1992 | 33.6°C | 26.1°C | 18.6°C | 39.1°C | 12.2°C | 62 mm | 49% | 3.3 m/s | 7.5 |
| 1991 | 33.2°C | 25.3°C | 17.5°C | 39.4°C | 11.9°C | 133 mm | 53% | 3.1 m/s | 7.9 |
| 1990 🔥 | 38.0°C | 29.9°C | 21.7°C | 45.7°C | 13.9°C | 30 mm | 36% | 3.3 m/s | 7.8 |
| 1989 | 34.5°C | 26.3°C | 18.1°C | 39.6°C | 13.4°C | 55 mm | 49% | 3.2 m/s | 8.1 |
| 1988 | 35.6°C | 27.7°C | 19.8°C | 38.9°C | 13.8°C | 38 mm | 48% | 3.8 m/s | 7.7 |
| 1987 | 33.9°C | 26.1°C | 18.4°C | 38.3°C | 10.1°C | 51 mm | 51% | 3.2 m/s | 7.9 |
| 1986 | 34.4°C | 25.7°C | 17.0°C | 43.5°C | 10.2°C | 17 mm | 41% | 3.2 m/s | 8.3 |
| 1985 | 33.9°C | 25.8°C | 17.7°C | 41.4°C | 12.5°C | 85 mm | 51% | 3 m/s | 7.8 |
| 1984 | 35.0°C | 26.8°C | 18.6°C | 39.2°C | 12.0°C | 46 mm | 43% | 3 m/s | 7.7 |
| 1983 | 31.4°C | 24.1°C | 16.7°C | 37.2°C | 10.8°C | 47 mm | 58% | 2.9 m/s | — |
| 1982 | 35.5°C | 27.5°C | 19.4°C | 41.3°C | 12.3°C | 89 mm | 46% | 3.3 m/s | — |
| 1981 | 36.2°C | 27.9°C | 19.5°C | 45.3°C | 15.1°C | 64 mm | 48% | 3.3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 34.4°C with lows near 19°C (mean 26.7°C), based on 45 years of NASA POWER data.
December averages 67 mm of rainfall in Goondiwindi, a relatively wet time of year. The wettest on record was 140 mm in 2004.
The hottest December reached 45.7°C in 1990. The coldest dipped to 8.9°C in 2004.
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 34.4°C to 34.6°C and overnight lows from 18.4°C to 19.3°C over the same span.
December is one of the warmer months of the year in Goondiwindi and a relatively wet time of year, so plan for around 34.4°C daytime highs and 19°C at night.
Not quite — December is the 10th coolest month in Goondiwindi, averaging 26.7°C.
For December in Goondiwindi, pack light, breathable clothing and sun protection, with typical highs of 34.4°C and lows of 19°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 50% — relatively dry.
Average wind speed in December is 3.1 m/s. The windiest December on record averaged 3.8 m/s (1988).
The wettest December on record was 2004 with 140 mm. On average, December sees 67 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 Goondiwindi 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.
