December is one of the warmer months of the year in Busselton, with average highs near 28°C and lows around 14.2°C (mean 21.1°C). It is one of the drier months, averaging 14 mm of rainfall and 57% relative humidity across the period.
December is one of the warmer months of the year in Busselton. Across 45 years of records, the warmest December in Busselton was 2019 — when the month averaged 24.6°C — while the coldest was 2005 at 17.2°C. Typical December days reach 28°C with nights near 14.2°C. The long-term trend is warming, about 0.5°C per decade.
December is one of the drier months in Busselton, averaging 14 mm of rainfall. The wettest December on record was 2012 with 80 mm, while the driest was 1994 at 1 mm.
Relative humidity in Busselton during December averages 57%. The most humid December was 2005 at 69%, and the least humid was 2019 at 49%.
December receives about 7.8 kWh/m²/day of solar energy in Busselton. The sunniest December was 1993 at 8.5 kWh/m²/day, and the cloudiest was 1984 at 6.9.
Average wind speed in Busselton during December is 4.1 m/s. The windiest Decembers were 2010 and 2023 at 4.7 m/s, while the calmest were 2012 and 2018 at 3.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.2°C | 20.9°C | 20.6°C | 21.7°C | 22.5°C | +2.3°C |
| Avg High | 26.9°C | 27.8°C | 27.4°C | 28.7°C | 29.8°C | +2.9°C |
| Avg Low | 13.6°C | 14.0°C | 13.8°C | 14.7°C | 15.2°C | +1.6°C |
| Avg Rain | 11 mm | 13 mm | 14 mm | 22 mm | 4 mm | -7 mm |
December temperatures in Busselton have risen by about 2.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 8.3°C (1986) to a record high of 41.2°C (2021).
Rainfall in December is one of the drier months, averaging 14 mm, with a wettest year of 80 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.7°C per decade while lows rose 0.4°C per decade, widening the gap between day and night.
One of the best times to visit Busselton
December is one of the best times to visit Busselton. Expect days averaging 28°C and nights around 14.2°C (mean 21.1°C) — warmer than Busselton's yearly average — with low rainfall (14 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 | 29.7°C | 22.4°C | 15.1°C | 38.4°C | 11.5°C | 2 mm | 55% | 4.2 m/s | — |
| 2024 | 29.7°C | 22.5°C | 15.4°C | 37.8°C | 11.9°C | 4 mm | 54% | 4.6 m/s | 8 |
| 2023 | 30.3°C | 23.1°C | 15.9°C | 35.8°C | 12.4°C | 2 mm | 50% | 4.7 m/s | 8.1 |
| 2022 | 29.1°C | 21.9°C | 14.7°C | 34.8°C | 11.3°C | 3 mm | 53% | 4.3 m/s | 7.9 |
| 2021 | 30.2°C | 22.7°C | 15.2°C | 41.2°C | 10.7°C | 7 mm | 53% | 4.2 m/s | 8 |
| 2020 | 30.0°C | 22.3°C | 14.6°C | 37.9°C | 10.4°C | 7 mm | 51% | 4.3 m/s | 8.4 |
| 2019 🔥 | 32.2°C | 24.6°C | 17.0°C | 38.5°C | 11.2°C | 11 mm | 49% | 3.9 m/s | 8.1 |
| 2018 | 28.5°C | 21.4°C | 14.3°C | 35.1°C | 10.7°C | 12 mm | 57% | 3.7 m/s | 7.9 |
| 2017 | 28.7°C | 21.6°C | 14.6°C | 35.0°C | 10.5°C | 27 mm | 56% | 4.2 m/s | 8 |
| 2016 | 27.7°C | 20.6°C | 13.6°C | 37.8°C | 10.3°C | 13 mm | 56% | 4.2 m/s | 8.1 |
| 2015 | 28.3°C | 21.4°C | 14.5°C | 38.0°C | 11.1°C | 8 mm | 54% | 4 m/s | 8 |
| 2014 | 27.4°C | 20.4°C | 13.4°C | 36.4°C | 9.9°C | 2 mm | 58% | 4.1 m/s | 8 |
| 2013 | 28.3°C | 21.2°C | 14.0°C | 35.9°C | 10.3°C | 4 mm | 57% | 3.9 m/s | 7.9 |
| 2012 🌧️ | 28.7°C | 22.2°C | 15.6°C | 38.6°C | 11.5°C | 80 mm | 61% | 3.7 m/s | 7.4 |
| 2011 | 28.7°C | 22.1°C | 15.5°C | 36.7°C | 12.6°C | 47 mm | 59% | 4.3 m/s | 7.1 |
| 2010 | 28.4°C | 21.7°C | 14.9°C | 34.9°C | 10.1°C | 16 mm | 56% | 4.7 m/s | 7.4 |
| 2009 | 28.7°C | 21.1°C | 13.5°C | 36.3°C | 9.9°C | 2 mm | 56% | 4.3 m/s | 8 |
| 2008 | 26.3°C | 19.8°C | 13.3°C | 35.3°C | 11.0°C | 19 mm | 64% | 3.9 m/s | 7.7 |
| 2007 | 26.0°C | 19.7°C | 13.5°C | 37.4°C | 9.1°C | 35 mm | 60% | 4.3 m/s | 7.1 |
| 2006 | 29.7°C | 22.3°C | 15.0°C | 36.1°C | 11.0°C | 5 mm | 51% | 3.9 m/s | 8 |
| 2005 ❄️ | 21.9°C | 17.2°C | 12.5°C | 28.3°C | 8.4°C | 22 mm | 69% | 3.9 m/s | 7 |
| 2004 | 29.0°C | 21.8°C | 14.6°C | 37.3°C | 9.5°C | 7 mm | 56% | 3.9 m/s | 8 |
| 2003 | 27.8°C | 20.7°C | 13.6°C | 35.6°C | 9.0°C | 5 mm | 60% | 4.2 m/s | 8.1 |
| 2002 | 29.5°C | 22.4°C | 15.2°C | 38.1°C | 8.5°C | 3 mm | 54% | 4.2 m/s | 7.9 |
| 2001 | 25.5°C | 19.0°C | 12.5°C | 30.1°C | 9.6°C | 38 mm | 62% | 4.3 m/s | 7.7 |
| 2000 | 29.3°C | 21.8°C | 14.2°C | 37.1°C | 10.5°C | 3 mm | 57% | 4.3 m/s | 8.3 |
| 1999 | 29.4°C | 22.5°C | 15.5°C | 35.7°C | 11.1°C | 19 mm | 56% | 4.5 m/s | 7.8 |
| 1998 | 28.8°C | 21.7°C | 14.7°C | 37.6°C | 9.7°C | 14 mm | 58% | 4.1 m/s | 7.6 |
| 1997 | 29.6°C | 22.1°C | 14.5°C | 36.6°C | 11.4°C | 2 mm | 57% | 4.3 m/s | 8.1 |
| 1996 | 24.9°C | 18.9°C | 12.9°C | 34.9°C | 9.7°C | 29 mm | 65% | 4.3 m/s | 7.8 |
| 1995 | 26.4°C | 20.2°C | 14.0°C | 33.0°C | 10.0°C | 33 mm | 63% | 4.4 m/s | 7.5 |
| 1994 | 29.6°C | 22.2°C | 14.7°C | 37.6°C | 9.6°C | 1 mm | 53% | 4.1 m/s | 8.2 |
| 1993 | 28.5°C | 20.7°C | 13.0°C | 37.0°C | 9.2°C | 4 mm | 54% | 4.4 m/s | 8.5 |
| 1992 | 26.4°C | 19.7°C | 13.0°C | 34.7°C | 9.7°C | 7 mm | 61% | 3.8 m/s | 8 |
| 1991 | 28.2°C | 21.1°C | 14.1°C | 37.2°C | 9.6°C | 14 mm | 61% | 3.8 m/s | 7.9 |
| 1990 | 26.5°C | 20.1°C | 13.7°C | 33.6°C | 10.5°C | 6 mm | 61% | 4 m/s | 7.8 |
| 1989 | 26.6°C | 20.0°C | 13.5°C | 35.4°C | 10.2°C | 12 mm | 57% | 4.1 m/s | 7.9 |
| 1988 | 27.5°C | 20.5°C | 13.5°C | 33.0°C | 9.9°C | 5 mm | 62% | 4.3 m/s | 8.2 |
| 1987 | 28.2°C | 21.4°C | 14.6°C | 39.6°C | 10.6°C | 20 mm | 58% | 4.2 m/s | 7.4 |
| 1986 | 27.9°C | 20.5°C | 13.1°C | 36.8°C | 8.3°C | 3 mm | 54% | 4.2 m/s | 7.9 |
| 1985 | 25.5°C | 19.1°C | 12.8°C | 34.4°C | 9.4°C | 6 mm | 57% | 4 m/s | 7.7 |
| 1984 | 24.9°C | 18.7°C | 12.5°C | 32.2°C | 9.1°C | 21 mm | 60% | 3.9 m/s | 6.9 |
| 1983 | 28.4°C | 21.4°C | 14.3°C | 35.2°C | 9.7°C | 7 mm | 58% | 3.9 m/s | — |
| 1982 | 27.7°C | 21.4°C | 15.2°C | 35.3°C | 10.2°C | 15 mm | 60% | 4 m/s | — |
| 1981 | 25.5°C | 19.1°C | 12.8°C | 32.4°C | 8.9°C | 11 mm | 59% | 4.2 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 28°C with lows near 14.2°C (mean 21.1°C), based on 45 years of NASA POWER data.
December averages 14 mm of rainfall in Busselton, one of the drier months. The wettest on record was 80 mm in 2012.
The hottest December reached 41.2°C in 2021. The coldest dipped to 8.3°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.6°C. Daytime highs moved from 26.4°C to 29.8°C and overnight lows from 13.5°C to 15.3°C over the same span.
December is one of the warmer months of the year in Busselton and one of the drier months, so plan for around 28°C daytime highs and 14.2°C at night.
Not quite — December is the 9th coolest month in Busselton, averaging 21.1°C.
For December in Busselton, pack light layers you can adjust through the day, with typical highs of 28°C and lows of 14.2°C.
Relative humidity in December averages 57% — moderately humid.
Average wind speed in December is 4.1 m/s. The windiest December on record averaged 4.7 m/s (2010).
The wettest December on record was 2012 with 80 mm. On average, December sees 14 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 Busselton 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.
