December is one of the warmer months of the year in Manjimup, with average highs near 27.7°C and lows around 11.8°C (mean 19.8°C). It is one of the drier months, averaging 18 mm of rainfall and 59% relative humidity across the period.
December is one of the warmer months of the year in Manjimup. Across 45 years of records, the warmest December in Manjimup was 2019 — when the month averaged 24°C — while the coldest was 2005 at 16°C. Typical December days reach 27.7°C with nights near 11.8°C. The long-term trend is warming, about 0.6°C per decade.
December is one of the drier months in Manjimup, averaging 18 mm of rainfall. The wettest December on record was 2012 with 57 mm, while the driest was 2025 at 1 mm.
Relative humidity in Manjimup during December averages 59%. The most humid December was 2005 at 72%, and the least humid was 2019 at 48%.
December receives about 7.4 kWh/m²/day of solar energy in Manjimup. The sunniest December was 2019 at 8.3 kWh/m²/day, and the cloudiest were 1984 and 1995 at 6.3.
Average wind speed in Manjimup during December is 3.7 m/s. The windiest December was 2023 at 4.4 m/s, while the calmest was 2008 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.9°C | 19.5°C | 19.2°C | 20.5°C | 21.2°C | +2.3°C |
| Avg High | 26.7°C | 27.2°C | 26.9°C | 28.7°C | 29.6°C | +2.9°C |
| Avg Low | 11.1°C | 11.7°C | 11.5°C | 12.4°C | 12.7°C | +1.6°C |
| Avg Rain | 17 mm | 20 mm | 21 mm | 24 mm | 6 mm | -11 mm |
December temperatures in Manjimup have risen by about 2.5°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 5.5°C (2002) to a record high of 41.1°C (2007).
Rainfall in December is one of the drier months, averaging 18 mm, with a wettest year of 57 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 Manjimup
December is one of the best times to visit Manjimup. Expect days averaging 27.7°C and nights around 11.8°C (mean 19.8°C) — warmer than Manjimup's yearly average — with low rainfall (18 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 | 29.6°C | 21.3°C | 13.0°C | 39.4°C | 8.6°C | 1 mm | 55% | 3.8 m/s | — |
| 2024 | 29.7°C | 21.3°C | 12.9°C | 41.1°C | 8.9°C | 4 mm | 56% | 4.2 m/s | 7.6 |
| 2023 | 29.8°C | 21.6°C | 13.3°C | 37.9°C | 9.6°C | 3 mm | 52% | 4.4 m/s | 7.6 |
| 2022 | 28.6°C | 20.4°C | 12.1°C | 36.4°C | 8.1°C | 3 mm | 57% | 4 m/s | 7.2 |
| 2021 | 30.2°C | 21.4°C | 12.5°C | 40.9°C | 8.3°C | 8 mm | 54% | 3.8 m/s | 7.7 |
| 2020 | 29.8°C | 21.0°C | 12.3°C | 39.1°C | 8.3°C | 14 mm | 53% | 4.2 m/s | 7.8 |
| 2019 🔥 | 33.5°C | 24.0°C | 14.5°C | 40.2°C | 8.7°C | 9 mm | 48% | 3.6 m/s | 8.3 |
| 2018 | 28.9°C | 20.5°C | 12.1°C | 39.1°C | 8.8°C | 17 mm | 58% | 3.3 m/s | 7.5 |
| 2017 | 28.7°C | 20.4°C | 12.2°C | 38.4°C | 6.9°C | 30 mm | 57% | 3.6 m/s | 7.6 |
| 2016 | 27.5°C | 19.3°C | 11.1°C | 38.9°C | 7.6°C | 26 mm | 58% | 3.8 m/s | 7.3 |
| 2015 | 28.5°C | 20.4°C | 12.3°C | 39.5°C | 9.0°C | 21 mm | 55% | 3.7 m/s | 7.4 |
| 2014 | 26.9°C | 19.0°C | 11.1°C | 39.1°C | 8.0°C | 5 mm | 60% | 3.6 m/s | 7.3 |
| 2013 | 27.9°C | 19.7°C | 11.4°C | 38.0°C | 7.6°C | 9 mm | 60% | 3.4 m/s | 7.7 |
| 2012 🌧️ | 29.2°C | 21.3°C | 13.4°C | 40.5°C | 8.6°C | 57 mm | 60% | 3.4 m/s | 7.3 |
| 2011 | 27.7°C | 20.4°C | 13.0°C | 38.6°C | 9.1°C | 39 mm | 63% | 3.9 m/s | 6.8 |
| 2010 | 27.8°C | 20.2°C | 12.5°C | 38.7°C | 7.1°C | 21 mm | 58% | 4.2 m/s | 6.8 |
| 2009 | 27.7°C | 19.4°C | 11.1°C | 36.6°C | 6.8°C | 4 mm | 60% | 3.6 m/s | 7.8 |
| 2008 | 24.5°C | 17.7°C | 10.9°C | 32.7°C | 8.4°C | 35 mm | 71% | 3.2 m/s | 7.3 |
| 2007 | 24.9°C | 18.0°C | 11.1°C | 41.1°C | 6.7°C | 43 mm | 63% | 3.8 m/s | 6.6 |
| 2006 | 30.0°C | 21.3°C | 12.5°C | 38.6°C | 8.3°C | 13 mm | 52% | 3.6 m/s | 7.7 |
| 2005 ❄️ | 21.9°C | 16.0°C | 10.1°C | 28.1°C | 6.8°C | 31 mm | 72% | 3.8 m/s | 6.9 |
| 2004 | 29.6°C | 21.0°C | 12.4°C | 38.3°C | 8.0°C | 6 mm | 55% | 3.6 m/s | 7.8 |
| 2003 | 27.3°C | 19.4°C | 11.5°C | 36.6°C | 7.2°C | 9 mm | 63% | 3.8 m/s | 7.4 |
| 2002 | 29.4°C | 21.2°C | 13.0°C | 40.9°C | 5.5°C | 6 mm | 55% | 3.9 m/s | 7.3 |
| 2001 | 24.1°C | 17.1°C | 10.2°C | 30.6°C | 6.8°C | 50 mm | 66% | 3.8 m/s | 6.8 |
| 2000 | 29.3°C | 20.8°C | 12.2°C | 38.8°C | 8.2°C | 8 mm | 58% | 3.7 m/s | 8.2 |
| 1999 | 27.8°C | 20.3°C | 12.8°C | 35.5°C | 7.7°C | 32 mm | 62% | 4.2 m/s | 7.3 |
| 1998 | 28.1°C | 20.2°C | 12.3°C | 35.8°C | 7.0°C | 22 mm | 61% | 3.7 m/s | 7.4 |
| 1997 | 29.3°C | 20.9°C | 12.4°C | 41.0°C | 8.7°C | 3 mm | 58% | 3.9 m/s | 7.9 |
| 1996 | 23.1°C | 16.7°C | 10.3°C | 33.6°C | 5.8°C | 43 mm | 70% | 3.6 m/s | 7.3 |
| 1995 | 25.2°C | 18.6°C | 11.9°C | 33.6°C | 7.9°C | 50 mm | 66% | 4 m/s | 6.3 |
| 1994 | 30.1°C | 21.2°C | 12.4°C | 39.0°C | 7.4°C | 2 mm | 53% | 3.7 m/s | 8.2 |
| 1993 | 28.4°C | 19.5°C | 10.7°C | 39.2°C | 6.0°C | 6 mm | 56% | 4 m/s | 8 |
| 1992 | 25.5°C | 18.1°C | 10.6°C | 33.4°C | 6.2°C | 14 mm | 65% | 3.3 m/s | 7.6 |
| 1991 | 28.0°C | 20.1°C | 12.2°C | 35.2°C | 7.3°C | 19 mm | 61% | 3.4 m/s | 7.4 |
| 1990 | 26.4°C | 18.9°C | 11.5°C | 34.3°C | 7.8°C | 8 mm | 62% | 3.5 m/s | 7.3 |
| 1989 | 27.0°C | 19.0°C | 11.0°C | 34.9°C | 6.9°C | 14 mm | 56% | 3.7 m/s | 7.6 |
| 1988 | 26.0°C | 18.5°C | 11.1°C | 33.5°C | 7.3°C | 10 mm | 66% | 3.8 m/s | 7.3 |
| 1987 | 28.6°C | 20.4°C | 12.3°C | 38.7°C | 8.6°C | 29 mm | 59% | 3.9 m/s | 7.1 |
| 1986 | 27.5°C | 19.0°C | 10.6°C | 34.9°C | 5.6°C | 3 mm | 56% | 3.7 m/s | 7.7 |
| 1985 | 25.2°C | 17.8°C | 10.4°C | 36.7°C | 6.5°C | 15 mm | 58% | 3.6 m/s | 7.1 |
| 1984 | 24.6°C | 17.3°C | 9.9°C | 32.7°C | 6.9°C | 30 mm | 63% | 3.5 m/s | 6.3 |
| 1983 | 28.3°C | 20.1°C | 12.0°C | 38.6°C | 6.7°C | 16 mm | 60% | 3.6 m/s | — |
| 1982 | 28.7°C | 20.8°C | 12.9°C | 37.9°C | 7.2°C | 16 mm | 58% | 3.7 m/s | — |
| 1981 | 24.8°C | 17.4°C | 10.1°C | 34.0°C | 5.9°C | 16 mm | 62% | 3.8 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 27.7°C with lows near 11.8°C (mean 19.8°C), based on 45 years of NASA POWER data.
December averages 18 mm of rainfall in Manjimup, one of the drier months. The wettest on record was 57 mm in 2012.
The hottest December reached 41.1°C in 2007. The coldest dipped to 5.5°C in 2002.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.5°C. Daytime highs moved from 26.3°C to 29.6°C and overnight lows from 11.1°C to 12.8°C over the same span.
December is one of the warmer months of the year in Manjimup and one of the drier months, so plan for around 27.7°C daytime highs and 11.8°C at night.
Not quite — December is the 9th coolest month in Manjimup, averaging 19.8°C.
For December in Manjimup, pack light layers you can adjust through the day, with typical highs of 27.7°C and lows of 11.8°C.
Relative humidity in December averages 59% — moderately humid.
Average wind speed in December is 3.7 m/s. The windiest December on record averaged 4.4 m/s (2023).
The wettest December on record was 2012 with 57 mm. On average, December sees 18 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 Manjimup 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.
