December is one of the warmer months of the year in Wallaroo, with average highs near 25.1°C and lows around 16.7°C (mean 20.9°C). It is about average for rainfall, averaging 19 mm of rainfall and 58% relative humidity across the period.
December is one of the warmer months of the year in Wallaroo. Across 45 years of records, the warmest December in Wallaroo was 2015 — when the month averaged 23.8°C — while the coldest was 2001 at 18.4°C. Typical December days reach 25.1°C with nights near 16.7°C. The long-term trend is warming, about 0.4°C per decade.
December is about average for rainfall in Wallaroo, averaging 19 mm of rainfall. The wettest December on record was 1992 with 73 mm, while the driest were 2016, 2017 and 2018 at 0 mm.
Relative humidity in Wallaroo during December averages 58%. The most humid December was 1992 at 72%, and the least humid was 2015 at 49%.
December receives about 7.8 kWh/m²/day of solar energy in Wallaroo. The sunniest December was 2021 at 8.5 kWh/m²/day, and the cloudiest was 1992 at 6.7.
Average wind speed in Wallaroo during December is 5.3 m/s. The windiest Decembers were 2002 and 2020 at 6 m/s, while the calmest was 2015 at 4.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.5°C | 20.2°C | 20.9°C | 21.9°C | 21.1°C | +0.6°C |
| Avg High | 24.7°C | 24.3°C | 25.1°C | 26.2°C | 25.2°C | +0.5°C |
| Avg Low | 16.2°C | 16.2°C | 16.8°C | 17.7°C | 16.9°C | +0.7°C |
| Avg Rain | 14 mm | 27 mm | 20 mm | 16 mm | 15 mm | +0 mm |
December temperatures in Wallaroo have risen by about 0.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 11.6°C (1995) to a record high of 40.3°C (2019).
Rainfall in December is about average for rainfall, averaging 19 mm, with a wettest year of 73 mm.
One of the best times to visit Wallaroo
December is one of the best times to visit Wallaroo. Expect days averaging 25.1°C and nights around 16.7°C (mean 20.9°C) — warmer than Wallaroo's yearly average — with low rainfall (19 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 | 26.0°C | 21.6°C | 17.1°C | 37.2°C | 13.3°C | 16 mm | 53% | 5.4 m/s | — |
| 2024 | 26.3°C | 22.3°C | 18.2°C | 35.3°C | 15.8°C | 10 mm | 57% | 5.1 m/s | 8.1 |
| 2023 | 24.5°C | 20.7°C | 16.8°C | 34.0°C | 14.3°C | 22 mm | 61% | 5.7 m/s | 7.1 |
| 2022 | 25.0°C | 20.7°C | 16.4°C | 34.9°C | 12.9°C | 26 mm | 59% | 5.3 m/s | 8.2 |
| 2021 | 25.0°C | 20.8°C | 16.7°C | 35.7°C | 13.2°C | 4 mm | 58% | 5.4 m/s | 8.5 |
| 2020 | 24.6°C | 20.4°C | 16.3°C | 33.1°C | 14.1°C | 10 mm | 57% | 6 m/s | 7.9 |
| 2019 | 28.5°C | 23.6°C | 18.7°C | 40.3°C | 13.8°C | 1 mm | 50% | 5.2 m/s | 8.2 |
| 2018 | 27.4°C | 22.9°C | 18.5°C | 37.4°C | 14.3°C | 0 mm | 55% | 5.6 m/s | 7.4 |
| 2017 | 25.8°C | 21.7°C | 17.6°C | 36.4°C | 14.6°C | 0 mm | 56% | 5.2 m/s | 7.4 |
| 2016 | 25.7°C | 21.5°C | 17.2°C | 35.7°C | 13.3°C | 0 mm | 58% | 5.1 m/s | 7.5 |
| 2015 🔥 | 28.5°C | 23.8°C | 19.2°C | 37.1°C | 12.7°C | 28 mm | 49% | 4.5 m/s | 8.1 |
| 2014 | 24.5°C | 20.9°C | 17.3°C | 33.5°C | 15.0°C | 9 mm | 60% | 5.3 m/s | 8.2 |
| 2013 | 25.7°C | 21.5°C | 17.3°C | 37.7°C | 12.6°C | 19 mm | 56% | 5.1 m/s | 7.7 |
| 2012 | 25.6°C | 21.4°C | 17.2°C | 35.1°C | 14.3°C | 7 mm | 55% | 5.2 m/s | 8.3 |
| 2011 | 25.7°C | 21.5°C | 17.3°C | 35.0°C | 13.8°C | 33 mm | 57% | 5 m/s | 7.8 |
| 2010 | 24.3°C | 20.4°C | 16.5°C | 35.6°C | 13.9°C | 59 mm | 63% | 5.3 m/s | 7.7 |
| 2009 | 25.8°C | 21.5°C | 17.3°C | 35.1°C | 13.8°C | 21 mm | 57% | 4.9 m/s | 8.3 |
| 2008 | 23.5°C | 20.0°C | 16.6°C | 29.9°C | 13.4°C | 47 mm | 64% | 5 m/s | 7.5 |
| 2007 | 25.9°C | 21.6°C | 17.3°C | 36.4°C | 14.0°C | 29 mm | 56% | 5 m/s | 7.9 |
| 2006 | 25.7°C | 21.2°C | 16.6°C | 36.8°C | 12.4°C | 16 mm | 52% | 5.5 m/s | 8.1 |
| 2005 | 25.3°C | 20.9°C | 16.5°C | 38.0°C | 14.4°C | 23 mm | 60% | 5.6 m/s | 7.9 |
| 2004 | 24.7°C | 20.6°C | 16.6°C | 33.9°C | 14.0°C | 20 mm | 61% | 5.4 m/s | 8 |
| 2003 | 26.2°C | 21.8°C | 17.5°C | 34.4°C | 13.4°C | 12 mm | 58% | 5.2 m/s | 7.9 |
| 2002 | 25.7°C | 21.1°C | 16.5°C | 35.6°C | 12.9°C | 8 mm | 55% | 6 m/s | 7.7 |
| 2001 ❄️ | 21.8°C | 18.4°C | 14.9°C | 31.6°C | 12.7°C | 17 mm | 65% | 5.4 m/s | 7.4 |
| 2000 | 26.4°C | 22.2°C | 18.0°C | 35.7°C | 14.4°C | 4 mm | 55% | 5.3 m/s | 8.1 |
| 1999 | 24.5°C | 20.4°C | 16.3°C | 34.1°C | 13.2°C | 25 mm | 61% | 5.7 m/s | 7.7 |
| 1998 | 25.2°C | 21.0°C | 16.9°C | 34.4°C | 13.6°C | 11 mm | 59% | 5.2 m/s | 8 |
| 1997 | 25.1°C | 20.9°C | 16.7°C | 31.6°C | 14.5°C | 36 mm | 63% | 5.1 m/s | 8 |
| 1996 | 24.1°C | 19.9°C | 15.8°C | 34.1°C | 13.0°C | 12 mm | 58% | 5.5 m/s | 7.9 |
| 1995 | 23.6°C | 19.5°C | 15.3°C | 31.9°C | 11.6°C | 12 mm | 59% | 5.4 m/s | 7.6 |
| 1994 | 26.7°C | 21.9°C | 17.0°C | 36.2°C | 11.8°C | 8 mm | 52% | 5 m/s | 8.1 |
| 1993 | 23.6°C | 19.8°C | 16.0°C | 30.2°C | 12.2°C | 35 mm | 62% | 5.6 m/s | 7.3 |
| 1992 🌧️ | 22.9°C | 19.5°C | 16.1°C | 30.8°C | 13.9°C | 73 mm | 72% | 5.2 m/s | 6.7 |
| 1991 | 23.2°C | 19.4°C | 15.5°C | 31.9°C | 12.4°C | 2 mm | 61% | 5.6 m/s | 8.2 |
| 1990 | 24.3°C | 20.1°C | 16.0°C | 33.4°C | 12.9°C | 52 mm | 62% | 5.2 m/s | 7.7 |
| 1989 | 25.7°C | 21.2°C | 16.7°C | 34.7°C | 12.9°C | 14 mm | 56% | 5.1 m/s | 8 |
| 1988 | 24.7°C | 20.7°C | 16.7°C | 33.2°C | 13.1°C | 22 mm | 62% | 5.4 m/s | 7.7 |
| 1987 | 25.1°C | 20.6°C | 16.0°C | 33.4°C | 11.9°C | 18 mm | 56% | 5.5 m/s | 8.1 |
| 1986 | 22.9°C | 18.8°C | 14.7°C | 33.0°C | 12.2°C | 17 mm | 60% | 5.8 m/s | 7.7 |
| 1985 | 22.7°C | 18.9°C | 15.1°C | 32.1°C | 13.4°C | 23 mm | 62% | 5.7 m/s | 7.8 |
| 1984 | 25.0°C | 20.8°C | 16.6°C | 35.0°C | 12.5°C | 7 mm | 56% | 5.3 m/s | 7.6 |
| 1983 | 26.0°C | 21.5°C | 17.1°C | 35.5°C | 13.3°C | 19 mm | 56% | 4.8 m/s | — |
| 1982 | 25.7°C | 21.3°C | 16.9°C | 34.7°C | 13.4°C | 5 mm | 53% | 5.1 m/s | — |
| 1981 | 24.8°C | 20.4°C | 16.1°C | 36.8°C | 13.2°C | 4 mm | 57% | 5.4 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 25.1°C with lows near 16.7°C (mean 20.9°C), based on 45 years of NASA POWER data.
December averages 19 mm of rainfall in Wallaroo, about average for rainfall. The wettest on record was 73 mm in 1992.
The hottest December reached 40.3°C in 2019. The coldest dipped to 11.6°C in 1995.
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 24.8°C to 25.4°C and overnight lows from 16.4°C to 17°C over the same span.
December is one of the warmer months of the year in Wallaroo and about average for rainfall, so plan for around 25.1°C daytime highs and 16.7°C at night.
Not quite — December is the 9th coolest month in Wallaroo, averaging 20.9°C.
For December in Wallaroo, pack light layers you can adjust through the day, with typical highs of 25.1°C and lows of 16.7°C.
Relative humidity in December averages 58% — moderately humid.
Average wind speed in December is 5.3 m/s. The windiest December on record averaged 6 m/s (2002).
The wettest December on record was 1992 with 73 mm. On average, December sees 19 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 Wallaroo 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.
