December is one of the warmer months of the year in Wallan, with average highs near 25.2°C and lows around 10.6°C (mean 17.9°C). It is about average for rainfall, averaging 60 mm of rainfall and 64% relative humidity across the period.
December is one of the warmer months of the year in Wallan. Across 45 years of records, the warmest December in Wallan was 2015 — when the month averaged 21.3°C — while the coldest was 1995 at 14.9°C. Typical December days reach 25.2°C with nights near 10.6°C. The long-term trend is warming, about 0.4°C per decade.
December is about average for rainfall in Wallan, averaging 60 mm of rainfall. The wettest December on record was 1985 with 142 mm, while the driest was 1997 at 9 mm.
Relative humidity in Wallan during December averages 64%. The most humid December was 1992 at 80%, and the least humid was 2015 at 49%.
December receives about 7.1 kWh/m²/day of solar energy in Wallan. The sunniest December was 1994 at 8.1 kWh/m²/day, and the cloudiest was 1992 at 5.9.
Average wind speed in Wallan during December is 2.6 m/s. The windiest December was 2002 at 3.1 m/s, while the calmest was 1992 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.2°C | 17.5°C | 18.1°C | 18.8°C | 17.9°C | +0.7°C |
| Avg High | 24.3°C | 24.7°C | 25.5°C | 26.1°C | 25.2°C | +0.9°C |
| Avg Low | 10.1°C | 10.2°C | 10.6°C | 11.4°C | 10.7°C | +0.6°C |
| Avg Rain | 63 mm | 65 mm | 54 mm | 60 mm | 54 mm | -8 mm |
December temperatures in Wallan have risen by about 0.8°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 3.6°C (1994) to a record high of 43.3°C (2019).
Rainfall in December is about average for rainfall, averaging 60 mm, with a wettest year of 142 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.5°C per decade while lows rose 0.3°C per decade, widening the gap between day and night.
One of the best times to visit Wallan
December is one of the best times to visit Wallan. Expect days averaging 25.2°C and nights around 10.6°C (mean 17.9°C) — warmer than Wallan's yearly average — with moderate rainfall (60 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 | 25.3°C | 17.7°C | 10.1°C | 37.4°C | 5.5°C | 42 mm | 60% | 2.6 m/s | — |
| 2024 | 27.7°C | 19.8°C | 11.9°C | 38.5°C | 8.2°C | 36 mm | 60% | 2.5 m/s | 7.8 |
| 2023 | 25.3°C | 18.7°C | 12.2°C | 35.5°C | 9.0°C | 105 mm | 70% | 2.5 m/s | 6.2 |
| 2022 | 23.0°C | 16.5°C | 10.0°C | 34.3°C | 5.6°C | 64 mm | 73% | 2.3 m/s | 7.3 |
| 2021 | 25.5°C | 18.0°C | 10.4°C | 37.1°C | 6.2°C | 29 mm | 64% | 2.7 m/s | 7.5 |
| 2020 | 24.2°C | 16.9°C | 9.5°C | 34.0°C | 5.8°C | 49 mm | 63% | 2.8 m/s | 7.1 |
| 2019 | 27.3°C | 19.3°C | 11.3°C | 43.3°C | 6.0°C | 14 mm | 55% | 2.8 m/s | 7.8 |
| 2018 | 27.2°C | 20.0°C | 12.8°C | 38.0°C | 7.7°C | 88 mm | 67% | 2.3 m/s | 6.8 |
| 2017 | 25.0°C | 18.4°C | 11.8°C | 33.2°C | 8.6°C | 139 mm | 69% | 2.3 m/s | 7 |
| 2016 | 26.6°C | 19.0°C | 11.5°C | 35.1°C | 6.6°C | 54 mm | 61% | 2.6 m/s | 7.4 |
| 2015 🔥 | 30.1°C | 21.3°C | 12.6°C | 40.7°C | 6.3°C | 38 mm | 49% | 2.6 m/s | 7.9 |
| 2014 | 26.5°C | 18.9°C | 11.2°C | 34.9°C | 7.2°C | 37 mm | 62% | 2.5 m/s | 7 |
| 2013 | 25.6°C | 18.0°C | 10.3°C | 37.4°C | 4.5°C | 50 mm | 63% | 2.5 m/s | 7 |
| 2012 | 26.4°C | 18.7°C | 11.1°C | 37.8°C | 7.6°C | 27 mm | 58% | 2.7 m/s | 7.2 |
| 2011 | 24.5°C | 17.7°C | 10.9°C | 33.4°C | 3.8°C | 59 mm | 67% | 2.5 m/s | 7.3 |
| 2010 | 21.9°C | 16.2°C | 10.5°C | 34.8°C | 5.5°C | 97 mm | 77% | 2.3 m/s | 6.5 |
| 2009 | 25.8°C | 17.9°C | 10.0°C | 36.5°C | 6.5°C | 46 mm | 62% | 2.4 m/s | 7.5 |
| 2008 | 23.2°C | 16.5°C | 9.8°C | 30.7°C | 6.0°C | 80 mm | 66% | 2.5 m/s | 6.8 |
| 2007 | 26.7°C | 19.4°C | 12.0°C | 37.8°C | 6.4°C | 93 mm | 62% | 2.5 m/s | 7.1 |
| 2006 | 26.1°C | 18.0°C | 9.9°C | 41.0°C | 6.3°C | 29 mm | 52% | 2.8 m/s | 7.8 |
| 2005 | 27.5°C | 19.2°C | 11.0°C | 42.4°C | 7.2°C | 56 mm | 54% | 2.6 m/s | 7.3 |
| 2004 | 23.7°C | 17.3°C | 10.8°C | 34.8°C | 6.9°C | 68 mm | 67% | 2.5 m/s | 7 |
| 2003 | 27.5°C | 19.7°C | 12.0°C | 37.4°C | 7.4°C | 63 mm | 61% | 2.5 m/s | 7.1 |
| 2002 | 26.2°C | 18.8°C | 11.4°C | 37.7°C | 6.1°C | 41 mm | 58% | 3.1 m/s | 6.9 |
| 2001 | 22.3°C | 15.7°C | 9.0°C | 34.2°C | 5.5°C | 34 mm | 66% | 2.7 m/s | 6.3 |
| 2000 | 26.2°C | 18.3°C | 10.3°C | 36.8°C | 6.0°C | 33 mm | 61% | 2.6 m/s | 7.8 |
| 1999 | 24.4°C | 17.6°C | 10.7°C | 34.7°C | 6.3°C | 102 mm | 63% | 2.8 m/s | 7 |
| 1998 | 26.2°C | 18.4°C | 10.7°C | 39.1°C | 5.7°C | 51 mm | 63% | 2.6 m/s | 7.1 |
| 1997 | 27.1°C | 19.1°C | 11.0°C | 34.4°C | 7.5°C | 9 mm | 59% | 2.8 m/s | 7.4 |
| 1996 | 23.8°C | 16.1°C | 8.5°C | 34.3°C | 4.6°C | 30 mm | 62% | 2.6 m/s | 7.2 |
| 1995 ❄️ | 21.6°C | 14.9°C | 8.1°C | 30.4°C | 4.9°C | 55 mm | 69% | 2.8 m/s | 6.8 |
| 1994 | 29.2°C | 20.3°C | 11.5°C | 38.7°C | 3.6°C | 12 mm | 52% | 2.7 m/s | 8.1 |
| 1993 | 22.0°C | 15.6°C | 9.1°C | 29.6°C | 4.1°C | 124 mm | 73% | 2.6 m/s | 6.8 |
| 1992 | 22.2°C | 16.9°C | 11.6°C | 29.0°C | 4.3°C | 112 mm | 80% | 2.1 m/s | 5.9 |
| 1991 | 23.4°C | 16.7°C | 9.9°C | 34.1°C | 4.9°C | 118 mm | 68% | 2.3 m/s | 6.9 |
| 1990 | 27.3°C | 19.3°C | 11.2°C | 37.9°C | 6.5°C | 34 mm | 59% | 2.6 m/s | 7.1 |
| 1989 | 25.8°C | 18.3°C | 10.8°C | 35.4°C | 6.5°C | 35 mm | 62% | 2.6 m/s | 7.4 |
| 1988 | 24.7°C | 17.9°C | 11.1°C | 36.0°C | 6.0°C | 84 mm | 70% | 2.4 m/s | 6.8 |
| 1987 | 23.5°C | 16.4°C | 9.3°C | 33.9°C | 5.4°C | 86 mm | 66% | 2.6 m/s | 7 |
| 1986 | 22.5°C | 15.7°C | 8.9°C | 32.3°C | 4.5°C | 82 mm | 68% | 2.7 m/s | 6.5 |
| 1985 🌧️ | 21.8°C | 16.2°C | 10.6°C | 28.9°C | 7.2°C | 142 mm | 75% | 2.3 m/s | 6.1 |
| 1984 | 24.4°C | 16.7°C | 8.9°C | 33.8°C | 5.8°C | 41 mm | 60% | 2.8 m/s | 7.1 |
| 1983 | 24.2°C | 17.3°C | 10.3°C | 35.0°C | 5.9°C | 17 mm | 66% | 2.4 m/s | — |
| 1982 | 26.3°C | 18.5°C | 10.7°C | 35.1°C | 6.6°C | 49 mm | 56% | 2.6 m/s | — |
| 1981 | 25.2°C | 17.7°C | 10.2°C | 37.3°C | 7.4°C | 26 mm | 60% | 2.7 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 25.2°C with lows near 10.6°C (mean 17.9°C), based on 45 years of NASA POWER data.
December averages 60 mm of rainfall in Wallan, about average for rainfall. The wettest on record was 142 mm in 1985.
The hottest December reached 43.3°C in 2019. The coldest dipped to 3.6°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.8°C. Daytime highs moved from 24.4°C to 25.4°C and overnight lows from 10.1°C to 10.9°C over the same span.
December is one of the warmer months of the year in Wallan and about average for rainfall, so plan for around 25.2°C daytime highs and 10.6°C at night.
Not quite — December is the 9th coolest month in Wallan, averaging 17.9°C.
For December in Wallan, pack light layers you can adjust through the day, with typical highs of 25.2°C and lows of 10.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 64% — moderately humid.
Average wind speed in December is 2.6 m/s. The windiest December on record averaged 3.1 m/s (2002).
The wettest December on record was 1985 with 142 mm. On average, December sees 60 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 Wallan 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.
