December is one of the warmer months of the year in Yanchep, with average highs near 27.9°C and lows around 17.6°C (mean 22.8°C). It is one of the drier months, averaging 10 mm of rainfall and 58% relative humidity across the period.
December is one of the warmer months of the year in Yanchep. Across 45 years of records, the warmest December in Yanchep was 2019 — when the month averaged 25.4°C — while the coldest was 2005 at 19°C. Typical December days reach 27.9°C with nights near 17.6°C. The long-term trend is warming, about 0.5°C per decade.
December is one of the drier months in Yanchep, averaging 10 mm of rainfall. The wettest December on record was 2007 with 41 mm, while the driest was 1994 at 0 mm.
Relative humidity in Yanchep during December averages 58%. The most humid December was 2005 at 67%, and the least humid was 2020 at 52%.
December receives about 8.4 kWh/m²/day of solar energy in Yanchep. The sunniest December was 2020 at 9 kWh/m²/day, and the cloudiest was 2011 at 7.7.
Average wind speed in Yanchep during December is 4.8 m/s. The windiest December was 1996 at 5.5 m/s, while the calmest were 2012 and 2019 at 4.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.8°C | 22.8°C | 22.3°C | 23.2°C | 24.1°C | +2.3°C |
| Avg High | 26.6°C | 28.0°C | 27.5°C | 28.3°C | 29.5°C | +2.9°C |
| Avg Low | 16.9°C | 17.6°C | 17.2°C | 18.1°C | 18.7°C | +1.8°C |
| Avg Rain | 9 mm | 9 mm | 8 mm | 15 mm | 7 mm | -2 mm |
December temperatures in Yanchep have risen by about 2.7°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 12°C (2002) to a record high of 41.5°C (2021).
Rainfall in December is one of the drier months, averaging 10 mm, with a wettest year of 41 mm.
One of the best times to visit Yanchep
December is one of the best times to visit Yanchep. Expect days averaging 27.9°C and nights around 17.6°C (mean 22.8°C) — warmer than Yanchep's yearly average — with low rainfall (10 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 | 24.1°C | 18.5°C | 38.7°C | 15.3°C | 14 mm | 56% | 5.1 m/s | — |
| 2024 | 29.5°C | 24.2°C | 18.9°C | 41.5°C | 15.7°C | 11 mm | 57% | 4.9 m/s | 8.6 |
| 2023 | 29.9°C | 24.6°C | 19.4°C | 36.7°C | 15.1°C | 2 mm | 54% | 4.7 m/s | 8.7 |
| 2022 | 28.3°C | 23.2°C | 18.1°C | 34.9°C | 14.7°C | 9 mm | 56% | 4.7 m/s | 8.7 |
| 2021 | 30.0°C | 24.4°C | 18.9°C | 41.5°C | 15.0°C | 3 mm | 55% | 4.9 m/s | 8.7 |
| 2020 | 29.8°C | 24.0°C | 18.1°C | 38.8°C | 12.1°C | 2 mm | 52% | 4.8 m/s | 9 |
| 2019 🔥 | 31.0°C | 25.4°C | 19.8°C | 39.1°C | 15.3°C | 4 mm | 54% | 4.3 m/s | 8.7 |
| 2018 | 27.5°C | 22.4°C | 17.3°C | 36.7°C | 14.3°C | 8 mm | 62% | 4.4 m/s | 8.5 |
| 2017 | 28.5°C | 23.3°C | 18.1°C | 35.9°C | 14.4°C | 25 mm | 57% | 5 m/s | 8.4 |
| 2016 | 26.8°C | 21.9°C | 17.0°C | 38.4°C | 14.4°C | 12 mm | 59% | 5.2 m/s | 8.9 |
| 2015 | 27.7°C | 22.6°C | 17.4°C | 38.5°C | 14.4°C | 9 mm | 58% | 4.8 m/s | 8.4 |
| 2014 | 27.1°C | 22.0°C | 16.9°C | 37.9°C | 13.8°C | 0 mm | 59% | 5 m/s | 8.6 |
| 2013 | 28.8°C | 23.6°C | 18.3°C | 38.3°C | 14.2°C | 2 mm | 56% | 4.6 m/s | 8.5 |
| 2012 | 29.2°C | 24.0°C | 18.8°C | 39.5°C | 14.0°C | 31 mm | 59% | 4.3 m/s | 7.9 |
| 2011 | 28.8°C | 23.8°C | 18.8°C | 36.4°C | 16.1°C | 40 mm | 59% | 4.4 m/s | 7.7 |
| 2010 | 27.8°C | 23.0°C | 18.2°C | 38.1°C | 14.2°C | 15 mm | 58% | 5 m/s | 7.8 |
| 2009 | 29.4°C | 23.6°C | 17.7°C | 39.2°C | 14.1°C | 3 mm | 54% | 5 m/s | 8.8 |
| 2008 | 26.2°C | 21.6°C | 16.9°C | 37.8°C | 14.6°C | 11 mm | 65% | 4.9 m/s | 8.6 |
| 2007 🌧️ | 26.3°C | 21.7°C | 17.1°C | 39.3°C | 12.8°C | 41 mm | 60% | 5.1 m/s | 7.9 |
| 2006 | 29.6°C | 23.7°C | 17.8°C | 38.2°C | 13.9°C | 7 mm | 55% | 4.6 m/s | 8.5 |
| 2005 ❄️ | 22.6°C | 19.0°C | 15.5°C | 31.3°C | 12.9°C | 7 mm | 67% | 4.7 m/s | 8.1 |
| 2004 | 28.8°C | 23.3°C | 17.9°C | 39.8°C | 13.5°C | 4 mm | 57% | 4.8 m/s | 8.3 |
| 2003 | 27.4°C | 22.1°C | 16.8°C | 37.6°C | 13.3°C | 2 mm | 63% | 5.1 m/s | 8.6 |
| 2002 | 29.4°C | 23.7°C | 18.1°C | 39.5°C | 12.0°C | 3 mm | 55% | 4.7 m/s | 8.4 |
| 2001 | 26.0°C | 21.2°C | 16.3°C | 31.3°C | 13.3°C | 4 mm | 59% | 5.2 m/s | 8.5 |
| 2000 | 29.1°C | 23.6°C | 18.1°C | 39.2°C | 13.2°C | 1 mm | 57% | 5.1 m/s | 8.8 |
| 1999 | 30.5°C | 24.8°C | 19.1°C | 39.5°C | 14.3°C | 9 mm | 54% | 4.7 m/s | 8.4 |
| 1998 | 28.3°C | 23.3°C | 18.3°C | 37.1°C | 13.2°C | 10 mm | 59% | 4.9 m/s | 8.3 |
| 1997 | 28.9°C | 23.5°C | 18.0°C | 40.6°C | 14.9°C | 0 mm | 58% | 4.8 m/s | 8.7 |
| 1996 | 26.9°C | 21.9°C | 16.9°C | 38.2°C | 14.1°C | 11 mm | 57% | 5.5 m/s | 8.5 |
| 1995 | 27.3°C | 22.3°C | 17.4°C | 35.8°C | 13.3°C | 7 mm | 58% | 5 m/s | 8.2 |
| 1994 | 29.4°C | 23.9°C | 18.4°C | 39.4°C | 13.8°C | 0 mm | 54% | 4.8 m/s | 8.7 |
| 1993 | 28.3°C | 22.6°C | 16.8°C | 37.7°C | 13.5°C | 2 mm | 53% | 5.2 m/s | 8.6 |
| 1992 | 27.0°C | 21.8°C | 16.6°C | 37.5°C | 13.4°C | 7 mm | 59% | 5.1 m/s | 8.5 |
| 1991 | 27.0°C | 22.1°C | 17.2°C | 37.5°C | 14.6°C | 38 mm | 64% | 4.5 m/s | 8.2 |
| 1990 | 26.4°C | 21.9°C | 17.4°C | 36.3°C | 14.6°C | 7 mm | 60% | 5.1 m/s | 8.5 |
| 1989 | 26.3°C | 21.6°C | 16.8°C | 36.8°C | 14.6°C | 5 mm | 60% | 4.9 m/s | 8.3 |
| 1988 | 27.9°C | 22.8°C | 17.6°C | 34.2°C | 12.9°C | 11 mm | 58% | 4.9 m/s | 8.4 |
| 1987 | 27.5°C | 22.4°C | 17.3°C | 40.1°C | 12.9°C | 11 mm | 61% | 4.5 m/s | 8.2 |
| 1986 | 27.3°C | 22.1°C | 16.8°C | 37.1°C | 12.3°C | 2 mm | 56% | 4.8 m/s | 8.3 |
| 1985 | 25.1°C | 20.5°C | 16.0°C | 34.0°C | 13.5°C | 3 mm | 59% | 4.8 m/s | 8.4 |
| 1984 | 24.9°C | 20.4°C | 15.9°C | 34.0°C | 12.1°C | 10 mm | 62% | 4.8 m/s | 7.9 |
| 1983 | 27.9°C | 22.6°C | 17.4°C | 37.6°C | 13.2°C | 22 mm | 62% | 4.4 m/s | — |
| 1982 | 26.5°C | 22.2°C | 17.8°C | 34.5°C | 14.1°C | 6 mm | 64% | 4.5 m/s | — |
| 1981 | 26.2°C | 21.3°C | 16.4°C | 34.0°C | 13.1°C | 10 mm | 58% | 5 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 27.9°C with lows near 17.6°C (mean 22.8°C), based on 45 years of NASA POWER data.
December averages 10 mm of rainfall in Yanchep, one of the drier months. The wettest on record was 41 mm in 2007.
The hottest December reached 41.5°C in 2021. The coldest dipped to 12°C in 2002.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.7°C. Daytime highs moved from 26.1°C to 29.5°C and overnight lows from 16.7°C to 18.8°C over the same span.
December is one of the warmer months of the year in Yanchep and one of the drier months, so plan for around 27.9°C daytime highs and 17.6°C at night.
Not quite — December is the 9th coolest month in Yanchep, averaging 22.8°C.
For December in Yanchep, pack light layers you can adjust through the day, with typical highs of 27.9°C and lows of 17.6°C.
Relative humidity in December averages 58% — moderately humid.
Average wind speed in December is 4.8 m/s. The windiest December on record averaged 5.5 m/s (1996).
The wettest December on record was 2007 with 41 mm. On average, December sees 10 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 Yanchep 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.
