December is one of the warmer months of the year in Goulburn, with average highs near 26.3°C and lows around 12.6°C (mean 19.5°C). It is about average for rainfall, averaging 73 mm of rainfall and 63% relative humidity across the period.
December is one of the warmer months of the year in Goulburn. Across 45 years of records, the warmest December in Goulburn was 1990 — when the month averaged 22.1°C — while the coldest was 2022 at 16.5°C. Typical December days reach 26.3°C with nights near 12.6°C. The long-term trend is warming, about 0.3°C per decade.
December is about average for rainfall in Goulburn, averaging 73 mm of rainfall. The wettest December on record was 2014 with 174 mm, while the driest was 2019 at 4 mm.
Relative humidity in Goulburn during December averages 63%. The most humid December was 1992 at 79%, and the least humid was 2019 at 47%.
December receives about 7.4 kWh/m²/day of solar energy in Goulburn. The sunniest December was 2005 at 8.6 kWh/m²/day, and the cloudiest was 1992 at 6.3.
Average wind speed in Goulburn during December is 1.3 m/s. The windiest December was 1984 at 1.7 m/s, while the calmest were 2011 and 2021 at 1.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.7°C | 19.1°C | 19.8°C | 20.2°C | 19.1°C | +0.4°C |
| Avg High | 25.4°C | 26.1°C | 26.9°C | 27.1°C | 25.6°C | +0.2°C |
| Avg Low | 12.0°C | 12.3°C | 12.7°C | 13.3°C | 12.6°C | +0.6°C |
| Avg Rain | 80 mm | 72 mm | 62 mm | 75 mm | 78 mm | -2 mm |
December temperatures in Goulburn have risen by about 0.4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 4.3°C (1986) to a record high of 39.9°C (2005).
Rainfall in December is about average for rainfall, averaging 73 mm, with a wettest year of 174 mm.
One of the best times to visit Goulburn
December is one of the best times to visit Goulburn. Expect days averaging 26.3°C and nights around 12.6°C (mean 19.5°C) — warmer than Goulburn's yearly average — with moderate rainfall (73 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 | 28.6°C | 20.7°C | 12.8°C | 38.9°C | 5.1°C | 30 mm | 52% | 1.4 m/s | — |
| 2024 | 29.4°C | 21.8°C | 14.3°C | 36.1°C | 8.8°C | 40 mm | 59% | 1.3 m/s | 8.1 |
| 2023 | 25.4°C | 19.7°C | 14.1°C | 34.5°C | 9.6°C | 131 mm | 74% | 1.2 m/s | 7 |
| 2022 ❄️ | 22.4°C | 16.5°C | 10.5°C | 32.4°C | 4.9°C | 48 mm | 71% | 1.2 m/s | 7.6 |
| 2021 | 23.1°C | 17.4°C | 11.8°C | 29.7°C | 7.1°C | 143 mm | 78% | 1.1 m/s | 7.3 |
| 2020 | 24.8°C | 18.5°C | 12.3°C | 36.4°C | 7.8°C | 76 mm | 68% | 1.5 m/s | 7.1 |
| 2019 | 30.5°C | 21.8°C | 13.2°C | 39.9°C | 7.3°C | 4 mm | 47% | 1.5 m/s | 8 |
| 2018 | 28.3°C | 21.3°C | 14.2°C | 36.9°C | 8.6°C | 94 mm | 64% | 1.2 m/s | 7.4 |
| 2017 | 27.9°C | 21.2°C | 14.5°C | 37.7°C | 10.0°C | 74 mm | 65% | 1.3 m/s | 6.8 |
| 2016 | 28.8°C | 21.8°C | 14.7°C | 34.0°C | 10.1°C | 84 mm | 60% | 1.4 m/s | 7.2 |
| 2015 | 28.5°C | 20.9°C | 13.4°C | 37.3°C | 8.6°C | 37 mm | 56% | 1.3 m/s | 7.7 |
| 2014 🌧️ | 25.8°C | 19.6°C | 13.4°C | 31.8°C | 8.7°C | 174 mm | 69% | 1.2 m/s | 7.2 |
| 2013 | 28.2°C | 20.5°C | 12.8°C | 38.3°C | 6.5°C | 42 mm | 56% | 1.3 m/s | 7.9 |
| 2012 | 27.4°C | 20.2°C | 12.9°C | 35.0°C | 7.1°C | 33 mm | 58% | 1.5 m/s | 7.2 |
| 2011 | 22.3°C | 16.6°C | 10.9°C | 29.6°C | 4.5°C | 59 mm | 73% | 1.1 m/s | 6.8 |
| 2010 | 23.2°C | 17.8°C | 12.5°C | 33.3°C | 6.4°C | 147 mm | 76% | 1.4 m/s | 6.9 |
| 2009 | 28.4°C | 20.8°C | 13.2°C | 38.2°C | 8.9°C | 85 mm | 57% | 1.3 m/s | 7.5 |
| 2008 | 25.3°C | 18.6°C | 11.9°C | 32.1°C | 7.4°C | 85 mm | 60% | 1.6 m/s | 7.4 |
| 2007 | 24.4°C | 18.6°C | 12.8°C | 32.9°C | 9.6°C | 95 mm | 72% | 1.2 m/s | 6.5 |
| 2006 | 27.0°C | 19.6°C | 12.3°C | 36.9°C | 5.4°C | 62 mm | 59% | 1.4 m/s | 6.9 |
| 2005 | 28.7°C | 20.7°C | 12.8°C | 39.9°C | 8.7°C | 28 mm | 52% | 1.5 m/s | 8.6 |
| 2004 | 25.5°C | 18.9°C | 12.3°C | 33.6°C | 6.6°C | 96 mm | 67% | 1.2 m/s | 7.5 |
| 2003 | 27.2°C | 20.4°C | 13.6°C | 36.2°C | 8.4°C | 48 mm | 65% | 1.3 m/s | 7.4 |
| 2002 | 27.5°C | 20.0°C | 12.5°C | 37.6°C | 6.8°C | 52 mm | 59% | 1.4 m/s | 7.4 |
| 2001 | 27.1°C | 19.8°C | 12.4°C | 35.1°C | 7.1°C | 26 mm | 52% | 1.5 m/s | 7.2 |
| 2000 | 27.9°C | 20.6°C | 13.3°C | 35.8°C | 6.6°C | 38 mm | 59% | 1.3 m/s | 8.2 |
| 1999 | 24.2°C | 18.0°C | 11.8°C | 31.6°C | 4.5°C | 131 mm | 68% | 1.2 m/s | 7 |
| 1998 | 27.4°C | 20.3°C | 13.3°C | 35.3°C | 7.8°C | 30 mm | 64% | 1.2 m/s | 7.8 |
| 1997 | 29.7°C | 21.9°C | 14.1°C | 37.4°C | 10.3°C | 23 mm | 53% | 1.4 m/s | 8 |
| 1996 | 26.1°C | 18.7°C | 11.4°C | 34.8°C | 6.4°C | 55 mm | 60% | 1.4 m/s | 7.5 |
| 1995 | 23.5°C | 17.0°C | 10.5°C | 31.5°C | 4.5°C | 70 mm | 67% | 1.3 m/s | 7.4 |
| 1994 | 28.0°C | 20.3°C | 12.6°C | 38.5°C | 6.4°C | 51 mm | 61% | 1.3 m/s | 8.1 |
| 1993 | 25.8°C | 18.9°C | 12.1°C | 35.1°C | 7.7°C | 40 mm | 63% | 1.5 m/s | 7 |
| 1992 | 21.9°C | 16.9°C | 12.0°C | 28.7°C | 6.9°C | 135 mm | 79% | 1.2 m/s | 6.3 |
| 1991 | 23.5°C | 17.3°C | 11.1°C | 34.0°C | 5.3°C | 153 mm | 68% | 1.5 m/s | 6.9 |
| 1990 🔥 | 30.6°C | 22.1°C | 13.6°C | 36.7°C | 6.8°C | 33 mm | 52% | 1.5 m/s | 8.1 |
| 1989 | 25.6°C | 18.8°C | 12.0°C | 34.5°C | 6.2°C | 76 mm | 63% | 1.5 m/s | 7.6 |
| 1988 | 24.8°C | 19.1°C | 13.4°C | 30.6°C | 8.0°C | 123 mm | 75% | 1.3 m/s | 6.8 |
| 1987 | 26.0°C | 18.8°C | 11.6°C | 34.9°C | 4.8°C | 90 mm | 61% | 1.3 m/s | 7.3 |
| 1986 | 24.4°C | 17.5°C | 10.7°C | 33.0°C | 4.3°C | 50 mm | 63% | 1.4 m/s | 7.8 |
| 1985 | 23.7°C | 17.9°C | 12.2°C | 31.1°C | 7.9°C | 78 mm | 67% | 1.5 m/s | 7.1 |
| 1984 | 24.7°C | 17.8°C | 10.9°C | 36.0°C | 6.7°C | 72 mm | 55% | 1.7 m/s | 7.7 |
| 1983 | 24.1°C | 17.9°C | 11.6°C | 34.6°C | 4.9°C | 101 mm | 71% | 1.2 m/s | — |
| 1982 | 28.8°C | 20.8°C | 12.9°C | 36.7°C | 7.9°C | 27 mm | 53% | 1.4 m/s | — |
| 1981 | 26.7°C | 19.5°C | 12.3°C | 34.3°C | 6.4°C | 106 mm | 60% | 1.3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 26.3°C with lows near 12.6°C (mean 19.5°C), based on 45 years of NASA POWER data.
December averages 73 mm of rainfall in Goulburn, about average for rainfall. The wettest on record was 174 mm in 2014.
The hottest December reached 39.9°C in 2005. The coldest dipped to 4.3°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.4°C. Daytime highs moved from 25.6°C to 25.8°C and overnight lows from 12°C to 12.7°C over the same span.
December is one of the warmer months of the year in Goulburn and about average for rainfall, so plan for around 26.3°C daytime highs and 12.6°C at night.
Not quite — December is the 10th coolest month in Goulburn, averaging 19.5°C.
For December in Goulburn, pack light layers you can adjust through the day, with typical highs of 26.3°C and lows of 12.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 63% — moderately humid.
Average wind speed in December is 1.3 m/s. The windiest December on record averaged 1.7 m/s (1984).
The wettest December on record was 2014 with 174 mm. On average, December sees 73 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 Goulburn 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.
