December is one of the warmer months of the year in Gunnedah, with average highs near 32.1°C and lows around 16.6°C (mean 24.4°C). It is a relatively wet time of year, averaging 80 mm of rainfall and 52% relative humidity across the period.
December is one of the warmer months of the year in Gunnedah. Across 45 years of records, the warmest December in Gunnedah was 1990 — when the month averaged 28.1°C — while the coldest was 2011 at 20°C. Typical December days reach 32.1°C with nights near 16.6°C. The long-term trend is warming, about 0.2°C per decade.
December is a relatively wet time of year in Gunnedah, averaging 80 mm of rainfall. The wettest December on record was 2004 with 193 mm, while the driest was 2019 at 5 mm.
Relative humidity in Gunnedah during December averages 52%. The most humid December was 2010 at 74%, and the least humid was 2019 at 32%.
December receives about 7.5 kWh/m²/day of solar energy in Gunnedah. The sunniest December was 2005 at 8.4 kWh/m²/day, and the cloudiest was 2010 at 6.2.
Average wind speed in Gunnedah during December is 2.2 m/s. The windiest December was 1988 at 2.7 m/s, while the calmest were 1999 and 2000 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.2°C | 24.0°C | 24.3°C | 24.8°C | 24.4°C | +0.2°C |
| Avg High | 32.4°C | 31.7°C | 32.0°C | 32.5°C | 32.1°C | -0.3°C |
| Avg Low | 16.1°C | 16.2°C | 16.6°C | 17.1°C | 16.7°C | +0.6°C |
| Avg Rain | 68 mm | 88 mm | 90 mm | 76 mm | 73 mm | +5 mm |
December temperatures in Gunnedah have stayed relatively stable across the record.
December has ranged from a record low of 6.9°C (1987) to a record high of 44.3°C (1990).
Rainfall in December is a relatively wet time of year, averaging 80 mm, with a wettest year of 193 mm.
One of the best times to visit Gunnedah
December is one of the best times to visit Gunnedah. Expect days averaging 32.1°C and nights around 16.6°C (mean 24.4°C) — warmer than Gunnedah's yearly average — with moderate rainfall (80 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 34.0°C | 25.5°C | 17.0°C | 41.0°C | 8.5°C | 40 mm | 43% | 2.1 m/s | — |
| 2024 | 34.7°C | 26.5°C | 18.3°C | 39.8°C | 12.2°C | 30 mm | 48% | 2.2 m/s | 7.9 |
| 2023 | 33.8°C | 26.2°C | 18.5°C | 39.9°C | 14.8°C | 95 mm | 54% | 2 m/s | 7.7 |
| 2022 | 29.7°C | 21.4°C | 13.2°C | 35.3°C | 8.1°C | 32 mm | 53% | 2.3 m/s | 7.8 |
| 2021 | 29.6°C | 22.7°C | 15.8°C | 35.6°C | 7.8°C | 65 mm | 65% | 2.1 m/s | 7.8 |
| 2020 | 31.0°C | 24.2°C | 17.5°C | 43.1°C | 10.4°C | 175 mm | 60% | 2.6 m/s | 6.6 |
| 2019 | 36.9°C | 27.7°C | 18.5°C | 43.2°C | 10.2°C | 5 mm | 32% | 2.4 m/s | 8.2 |
| 2018 | 34.3°C | 25.9°C | 17.4°C | 39.8°C | 12.0°C | 58 mm | 47% | 2 m/s | 8.1 |
| 2017 | 34.3°C | 26.5°C | 18.7°C | 41.3°C | 11.0°C | 61 mm | 49% | 2.2 m/s | 7.6 |
| 2016 | 34.0°C | 26.5°C | 18.9°C | 40.0°C | 10.5°C | 64 mm | 50% | 2.2 m/s | 7.4 |
| 2015 | 32.1°C | 24.3°C | 16.5°C | 36.6°C | 10.9°C | 84 mm | 54% | 2.4 m/s | 7.6 |
| 2014 | 31.8°C | 24.7°C | 17.6°C | 38.2°C | 11.6°C | 123 mm | 57% | 2.4 m/s | 6.8 |
| 2013 | 34.1°C | 25.1°C | 16.1°C | 41.2°C | 7.9°C | 30 mm | 43% | 2.1 m/s | 8.1 |
| 2012 | 34.2°C | 26.1°C | 18.1°C | 41.6°C | 10.7°C | 73 mm | 46% | 2.3 m/s | 7.5 |
| 2011 ❄️ | 26.2°C | 20.0°C | 13.8°C | 31.0°C | 8.8°C | 97 mm | 69% | 2.1 m/s | 6.7 |
| 2010 | 27.1°C | 21.4°C | 15.8°C | 34.2°C | 8.4°C | 168 mm | 74% | 2 m/s | 6.2 |
| 2009 | 33.2°C | 25.8°C | 18.4°C | 41.5°C | 11.6°C | 136 mm | 46% | 2.4 m/s | 6.7 |
| 2008 | 30.5°C | 23.2°C | 16.0°C | 34.6°C | 10.3°C | 95 mm | 59% | 2.2 m/s | 7.2 |
| 2007 | 28.6°C | 22.4°C | 16.2°C | 33.2°C | 9.5°C | 167 mm | 70% | 2.2 m/s | 6.6 |
| 2006 | 32.5°C | 24.6°C | 16.7°C | 37.2°C | 9.3°C | 34 mm | 44% | 2.3 m/s | 6.9 |
| 2005 | 34.6°C | 25.6°C | 16.5°C | 41.7°C | 10.2°C | 54 mm | 45% | 2.4 m/s | 8.4 |
| 2004 🌧️ | 29.8°C | 22.9°C | 16.1°C | 40.6°C | 8.3°C | 193 mm | 62% | 2.3 m/s | 7.6 |
| 2003 | 34.2°C | 26.0°C | 17.8°C | 42.2°C | 9.8°C | 50 mm | 50% | 2.3 m/s | 7.6 |
| 2002 | 32.6°C | 24.4°C | 16.1°C | 38.2°C | 8.9°C | 85 mm | 49% | 2.1 m/s | 7.7 |
| 2001 | 32.6°C | 24.4°C | 16.2°C | 39.9°C | 11.1°C | 46 mm | 47% | 2.2 m/s | 7.4 |
| 2000 | 31.5°C | 23.9°C | 16.2°C | 36.4°C | 11.1°C | 44 mm | 57% | 1.8 m/s | 7.8 |
| 1999 | 28.9°C | 22.0°C | 15.1°C | 34.4°C | 10.1°C | 63 mm | 58% | 1.8 m/s | 7 |
| 1998 | 32.6°C | 24.6°C | 16.7°C | 36.9°C | 9.9°C | 38 mm | 52% | 1.9 m/s | 7.7 |
| 1997 | 34.0°C | 26.4°C | 18.7°C | 38.4°C | 13.5°C | 112 mm | 52% | 2.2 m/s | 7.7 |
| 1996 | 30.1°C | 22.6°C | 15.2°C | 36.3°C | 9.7°C | 155 mm | 58% | 2.1 m/s | 7.6 |
| 1995 | 29.9°C | 22.1°C | 14.2°C | 36.6°C | 7.2°C | 75 mm | 56% | 2.3 m/s | 7.6 |
| 1994 | 34.4°C | 25.7°C | 16.9°C | 41.6°C | 10.1°C | 47 mm | 46% | 2.5 m/s | 8.1 |
| 1993 | 30.6°C | 22.8°C | 15.1°C | 39.3°C | 7.5°C | 83 mm | 54% | 2.4 m/s | 7.4 |
| 1992 | 29.2°C | 22.4°C | 15.6°C | 35.0°C | 8.6°C | 104 mm | 61% | 2.2 m/s | 7.1 |
| 1991 | 30.2°C | 22.8°C | 15.4°C | 38.3°C | 10.9°C | 154 mm | 57% | 2.2 m/s | 7.5 |
| 1990 🔥 | 36.8°C | 28.1°C | 19.3°C | 44.3°C | 10.7°C | 50 mm | 37% | 2.4 m/s | 7.8 |
| 1989 | 32.2°C | 23.9°C | 15.6°C | 37.9°C | 11.0°C | 61 mm | 52% | 2.4 m/s | 7.9 |
| 1988 | 32.6°C | 25.2°C | 17.8°C | 38.9°C | 10.7°C | 121 mm | 55% | 2.7 m/s | 7.2 |
| 1987 | 32.3°C | 24.2°C | 16.1°C | 39.4°C | 6.9°C | 75 mm | 50% | 2.6 m/s | 7.7 |
| 1986 | 32.2°C | 23.5°C | 14.8°C | 39.7°C | 7.7°C | 22 mm | 42% | 2.3 m/s | 8.3 |
| 1985 | 30.8°C | 23.0°C | 15.2°C | 38.3°C | 9.7°C | 109 mm | 53% | 2.3 m/s | 7.6 |
| 1984 | 32.2°C | 23.7°C | 15.2°C | 38.3°C | 9.7°C | 52 mm | 43% | 2.5 m/s | 8 |
| 1983 | 30.6°C | 23.0°C | 15.3°C | 38.3°C | 9.1°C | 76 mm | 58% | 2.2 m/s | — |
| 1982 | 34.0°C | 26.0°C | 18.1°C | 41.2°C | 11.3°C | 59 mm | 43% | 2.3 m/s | — |
| 1981 | 34.4°C | 25.6°C | 16.8°C | 41.7°C | 12.2°C | 38 mm | 46% | 2.3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 32.1°C with lows near 16.6°C (mean 24.4°C), based on 45 years of NASA POWER data.
December averages 80 mm of rainfall in Gunnedah, a relatively wet time of year. The wettest on record was 193 mm in 2004.
The hottest December reached 44.3°C in 1990. The coldest dipped to 6.9°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.2°C. Daytime highs moved from 32.4°C to 32.4°C and overnight lows from 16.1°C to 16.6°C over the same span.
December is one of the warmer months of the year in Gunnedah and a relatively wet time of year, so plan for around 32.1°C daytime highs and 16.6°C at night.
Not quite — December is the 10th coolest month in Gunnedah, averaging 24.4°C.
For December in Gunnedah, pack light, breathable clothing and sun protection, with typical highs of 32.1°C and lows of 16.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 52% — relatively dry.
Average wind speed in December is 2.2 m/s. The windiest December on record averaged 2.7 m/s (1988).
The wettest December on record was 2004 with 193 mm. On average, December sees 80 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 Gunnedah 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.
