December is one of the warmer months of the year in Ballarat, with average highs near 24.6°C and lows around 9.4°C (mean 17°C). It is about average for rainfall, averaging 48 mm of rainfall and 62% relative humidity across the period.
December is one of the warmer months of the year in Ballarat. Across 45 years of records, the warmest December in Ballarat was 2015 — when the month averaged 20.5°C — while the coldest were 1986 and 2001 at 14.2°C. Typical December days reach 24.6°C with nights near 9.4°C. The long-term trend is warming, about 0.3°C per decade.
December is about average for rainfall in Ballarat, averaging 48 mm of rainfall. The wettest December on record was 1985 with 125 mm, while the driest was 1997 at 6 mm.
Relative humidity in Ballarat during December averages 62%. The most humid December was 1992 at 79%, and the least humid was 2015 at 46%.
December receives about 7.2 kWh/m²/day of solar energy in Ballarat. The sunniest December was 1994 at 8.1 kWh/m²/day, and the cloudiest was 1992 at 5.9.
Average wind speed in Ballarat during December is 3 m/s. The windiest December was 1984 at 3.6 m/s, while the calmest was 2009 at 2.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.3°C | 16.7°C | 17.1°C | 17.9°C | 16.9°C | +0.6°C |
| Avg High | 23.7°C | 24.1°C | 24.8°C | 25.7°C | 24.3°C | +0.6°C |
| Avg Low | 9.0°C | 9.2°C | 9.3°C | 10.2°C | 9.4°C | +0.4°C |
| Avg Rain | 53 mm | 54 mm | 47 mm | 39 mm | 44 mm | -8 mm |
December temperatures in Ballarat have risen by about 0.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 1.9°C (1993) to a record high of 42.8°C (2019).
Rainfall in December is about average for rainfall, averaging 48 mm, with a wettest year of 125 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.4°C per decade while lows rose 0.2°C per decade, widening the gap between day and night.
One of the best times to visit Ballarat
December is one of the best times to visit Ballarat. Expect days averaging 24.6°C and nights around 9.4°C (mean 17°C) — warmer than Ballarat's yearly average — with moderate rainfall (48 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 | 24.3°C | 16.6°C | 8.9°C | 35.9°C | 4.6°C | 30 mm | 58% | 3 m/s | — |
| 2024 | 27.1°C | 18.7°C | 10.3°C | 39.5°C | 6.5°C | 23 mm | 58% | 3 m/s | 7.7 |
| 2023 | 24.2°C | 17.5°C | 10.8°C | 35.5°C | 7.0°C | 106 mm | 69% | 3.2 m/s | 6.4 |
| 2022 | 22.2°C | 15.6°C | 9.0°C | 34.8°C | 3.4°C | 42 mm | 71% | 2.8 m/s | 7.3 |
| 2021 | 25.3°C | 17.2°C | 9.2°C | 35.9°C | 5.1°C | 27 mm | 62% | 3.1 m/s | 7.9 |
| 2020 | 22.9°C | 15.5°C | 8.1°C | 32.7°C | 4.4°C | 38 mm | 62% | 3.3 m/s | 7 |
| 2019 | 27.3°C | 18.8°C | 10.4°C | 42.8°C | 4.6°C | 9 mm | 54% | 3.3 m/s | 7.9 |
| 2018 | 27.0°C | 19.4°C | 11.8°C | 36.8°C | 6.6°C | 75 mm | 62% | 2.8 m/s | 6.8 |
| 2017 | 25.1°C | 17.9°C | 10.6°C | 35.2°C | 6.3°C | 52 mm | 63% | 2.8 m/s | 7 |
| 2016 | 25.9°C | 18.0°C | 10.1°C | 34.8°C | 5.0°C | 30 mm | 58% | 3 m/s | 7.4 |
| 2015 🔥 | 29.5°C | 20.5°C | 11.5°C | 40.7°C | 4.9°C | 24 mm | 46% | 3 m/s | 7.8 |
| 2014 | 25.5°C | 17.7°C | 9.9°C | 33.1°C | 5.5°C | 29 mm | 61% | 2.9 m/s | 7.3 |
| 2013 | 25.4°C | 17.2°C | 9.0°C | 38.0°C | 3.2°C | 30 mm | 60% | 2.8 m/s | 7.3 |
| 2012 | 25.3°C | 17.5°C | 9.7°C | 35.7°C | 6.3°C | 20 mm | 58% | 3 m/s | 7.3 |
| 2011 | 24.9°C | 17.4°C | 9.9°C | 33.7°C | 3.3°C | 43 mm | 64% | 2.9 m/s | 7.5 |
| 2010 | 20.7°C | 14.9°C | 9.0°C | 34.4°C | 3.3°C | 78 mm | 77% | 2.8 m/s | 6.6 |
| 2009 | 24.7°C | 16.5°C | 8.4°C | 35.2°C | 4.3°C | 44 mm | 63% | 2.7 m/s | 7.6 |
| 2008 | 22.1°C | 15.4°C | 8.6°C | 28.8°C | 5.2°C | 79 mm | 67% | 3 m/s | 6.9 |
| 2007 | 25.9°C | 18.2°C | 10.4°C | 38.5°C | 4.4°C | 73 mm | 61% | 2.8 m/s | 7.2 |
| 2006 | 25.9°C | 17.3°C | 8.7°C | 40.4°C | 4.5°C | 17 mm | 50% | 3.2 m/s | 7.8 |
| 2005 | 26.1°C | 17.9°C | 9.8°C | 41.5°C | 5.3°C | 43 mm | 55% | 3.4 m/s | 7.2 |
| 2004 | 23.6°C | 16.7°C | 9.8°C | 34.2°C | 4.8°C | 74 mm | 67% | 2.8 m/s | 7.1 |
| 2003 | 27.4°C | 19.2°C | 10.9°C | 37.0°C | 6.5°C | 42 mm | 58% | 3 m/s | 7.3 |
| 2002 | 25.9°C | 17.9°C | 10.0°C | 35.8°C | 4.7°C | 37 mm | 56% | 3.5 m/s | 7.2 |
| 2001 | 20.7°C | 14.2°C | 7.7°C | 32.7°C | 4.3°C | 35 mm | 69% | 3.1 m/s | 6.1 |
| 2000 | 26.0°C | 17.5°C | 9.0°C | 37.2°C | 4.5°C | 26 mm | 59% | 3 m/s | 7.9 |
| 1999 | 24.0°C | 16.7°C | 9.4°C | 34.0°C | 3.8°C | 98 mm | 62% | 3.3 m/s | 7 |
| 1998 | 25.2°C | 17.5°C | 9.7°C | 38.5°C | 4.8°C | 38 mm | 62% | 3.1 m/s | 7.2 |
| 1997 | 25.7°C | 17.8°C | 9.9°C | 33.6°C | 6.3°C | 6 mm | 59% | 3.2 m/s | 7.4 |
| 1996 | 23.4°C | 15.4°C | 7.4°C | 32.4°C | 3.5°C | 25 mm | 61% | 3 m/s | 7.4 |
| 1995 | 21.7°C | 14.4°C | 7.1°C | 29.7°C | 2.3°C | 39 mm | 67% | 3.3 m/s | 6.9 |
| 1994 | 28.2°C | 19.2°C | 10.3°C | 35.7°C | 2.2°C | 12 mm | 50% | 3 m/s | 8.1 |
| 1993 | 22.0°C | 15.1°C | 8.1°C | 29.5°C | 1.9°C | 98 mm | 69% | 3.1 m/s | 6.9 |
| 1992 | 21.5°C | 16.1°C | 10.7°C | 28.7°C | 4.6°C | 109 mm | 79% | 2.8 m/s | 5.9 |
| 1991 | 23.2°C | 16.1°C | 9.1°C | 33.6°C | 2.6°C | 91 mm | 66% | 2.9 m/s | 7.1 |
| 1990 | 26.5°C | 18.2°C | 10.0°C | 38.0°C | 4.6°C | 25 mm | 58% | 3.2 m/s | 7.1 |
| 1989 | 25.2°C | 17.3°C | 9.4°C | 34.0°C | 5.2°C | 20 mm | 60% | 3.1 m/s | 7.4 |
| 1988 | 25.1°C | 17.6°C | 10.2°C | 35.7°C | 4.5°C | 65 mm | 67% | 2.9 m/s | 7.1 |
| 1987 | 23.0°C | 15.6°C | 8.2°C | 33.7°C | 3.2°C | 88 mm | 65% | 3.1 m/s | 7.2 |
| 1986 ❄️ | 21.2°C | 14.2°C | 7.3°C | 32.1°C | 2.8°C | 76 mm | 68% | 3.1 m/s | 6.5 |
| 1985 🌧️ | 21.3°C | 15.4°C | 9.6°C | 28.2°C | 5.8°C | 125 mm | 73% | 3 m/s | 6.1 |
| 1984 | 23.3°C | 15.7°C | 8.2°C | 33.2°C | 5.6°C | 28 mm | 62% | 3.6 m/s | 7.2 |
| 1983 | 24.1°C | 16.7°C | 9.3°C | 34.5°C | 4.5°C | 12 mm | 65% | 2.8 m/s | — |
| 1982 | 25.6°C | 17.6°C | 9.6°C | 34.3°C | 4.4°C | 39 mm | 55% | 3.1 m/s | — |
| 1981 | 24.7°C | 16.9°C | 9.2°C | 36.9°C | 5.6°C | 21 mm | 59% | 3.2 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 24.6°C with lows near 9.4°C (mean 17°C), based on 45 years of NASA POWER data.
December averages 48 mm of rainfall in Ballarat, about average for rainfall. The wettest on record was 125 mm in 1985.
The hottest December reached 42.8°C in 2019. The coldest dipped to 1.9°C in 1993.
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 23.8°C to 24.6°C and overnight lows from 9.2°C to 9.6°C over the same span.
December is one of the warmer months of the year in Ballarat and about average for rainfall, so plan for around 24.6°C daytime highs and 9.4°C at night.
Not quite — December is the 9th coolest month in Ballarat, averaging 17°C.
For December in Ballarat, pack light layers you can adjust through the day, with typical highs of 24.6°C and lows of 9.4°C.
Relative humidity in December averages 62% — moderately humid.
Average wind speed in December is 3 m/s. The windiest December on record averaged 3.6 m/s (1984).
The wettest December on record was 1985 with 125 mm. On average, December sees 48 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 Ballarat 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.
