December is one of the warmer months of the year in Roebourne, with average highs near 40.4°C and lows around 25.2°C (mean 32.8°C). It is about average for rainfall, averaging 19 mm of rainfall and 42% relative humidity across the period.
December is one of the warmer months of the year in Roebourne. Across 45 years of records, the warmest December in Roebourne was 2019 — when the month averaged 35.5°C — while the coldest was 1988 at 30.2°C. Typical December days reach 40.4°C with nights near 25.2°C. The long-term trend is warming, about 0.3°C per decade.
December is about average for rainfall in Roebourne, averaging 19 mm of rainfall. The wettest December on record was 1999 with 115 mm, while the driest were 2001 and 2018 at 0 mm.
Relative humidity in Roebourne during December averages 42%. The most humid December was 2010 at 53%, and the least humid was 1986 at 30%.
December receives about 7.9 kWh/m²/day of solar energy in Roebourne. The sunniest Decembers were 1990, 1992 and 2001, among others at 8.3 kWh/m²/day, and the cloudiest was 2012 at 6.8.
Average wind speed in Roebourne during December is 4.4 m/s. The windiest December was 2023 at 5 m/s, while the calmest was 2012 at 3.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 32.4°C | 32.5°C | 32.8°C | 32.8°C | 33.8°C | +1.4°C |
| Avg High | 40.2°C | 40.0°C | 40.5°C | 40.2°C | 41.3°C | +1.1°C |
| Avg Low | 24.6°C | 25.2°C | 25.0°C | 25.4°C | 26.3°C | +1.7°C |
| Avg Rain | 16 mm | 31 mm | 12 mm | 21 mm | 14 mm | -2 mm |
December temperatures in Roebourne have risen by about 1.4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 18.5°C (1985) to a record high of 48.4°C (2018).
Rainfall in December is about average for rainfall, averaging 19 mm, with a wettest year of 115 mm.
A quieter season to visit Roebourne
If your dates are flexible, the more temperate months of August and June tend to be the most comfortable for visiting Roebourne. That said, December — with days averaging 40.4°C and nights around 25.2°C (mean 32.8°C) and low rainfall (19 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 42.5°C | 35.0°C | 27.5°C | 46.5°C | 23.9°C | 1 mm | 37% | 4.2 m/s | — |
| 2024 | 41.1°C | 34.6°C | 28.1°C | 45.3°C | 22.5°C | 23 mm | 46% | 3.9 m/s | 7.3 |
| 2023 | 41.2°C | 32.7°C | 24.2°C | 47.8°C | 21.7°C | 1 mm | 41% | 5 m/s | 8.2 |
| 2022 | 40.7°C | 33.0°C | 25.2°C | 45.4°C | 22.1°C | 0 mm | 41% | 4.6 m/s | 7.9 |
| 2021 | 43.4°C | 35.2°C | 27.1°C | 46.8°C | 23.7°C | 1 mm | 32% | 4.5 m/s | 8 |
| 2020 | 38.9°C | 32.4°C | 25.8°C | 44.1°C | 22.7°C | 59 mm | 51% | 3.9 m/s | 7.5 |
| 2019 🔥 | 43.2°C | 35.5°C | 27.8°C | 47.7°C | 24.0°C | 3 mm | 32% | 4 m/s | 7.8 |
| 2018 | 41.2°C | 32.8°C | 24.5°C | 48.4°C | 19.0°C | 0 mm | 40% | 4.5 m/s | 8.1 |
| 2017 | 39.8°C | 32.5°C | 25.2°C | 42.3°C | 21.6°C | 12 mm | 46% | 4.1 m/s | 7.5 |
| 2016 | 39.3°C | 32.5°C | 25.8°C | 43.8°C | 21.9°C | 14 mm | 47% | 4.1 m/s | 7.6 |
| 2015 | 41.0°C | 32.5°C | 24.0°C | 45.7°C | 21.0°C | 0 mm | 42% | 4.8 m/s | 8.1 |
| 2014 | 40.9°C | 32.9°C | 24.9°C | 46.8°C | 20.7°C | 4 mm | 40% | 4.4 m/s | 8.2 |
| 2013 | 39.8°C | 32.6°C | 25.5°C | 44.6°C | 21.1°C | 99 mm | 45% | 4.3 m/s | 7.7 |
| 2012 | 38.9°C | 32.5°C | 26.2°C | 44.4°C | 23.2°C | 39 mm | 48% | 3.5 m/s | 6.8 |
| 2011 | 40.2°C | 32.3°C | 24.5°C | 46.9°C | 21.0°C | 1 mm | 46% | 4.8 m/s | 8.2 |
| 2010 | 37.9°C | 31.5°C | 25.1°C | 43.7°C | 21.8°C | 37 mm | 53% | 4.5 m/s | 7.6 |
| 2009 | 41.5°C | 33.7°C | 25.8°C | 46.0°C | 21.4°C | 26 mm | 39% | 4.3 m/s | 7.9 |
| 2008 | 39.4°C | 31.8°C | 24.2°C | 43.0°C | 20.3°C | 21 mm | 41% | 4.3 m/s | 7.9 |
| 2007 | 39.3°C | 31.8°C | 24.2°C | 43.7°C | 20.3°C | 5 mm | 41% | 4.6 m/s | 7.9 |
| 2006 | 40.6°C | 32.9°C | 25.1°C | 44.9°C | 21.6°C | 13 mm | 38% | 4.2 m/s | 8.2 |
| 2005 | 40.9°C | 33.3°C | 25.8°C | 45.0°C | 22.2°C | 17 mm | 39% | 4 m/s | 7.9 |
| 2004 | 42.4°C | 34.5°C | 26.5°C | 46.1°C | 21.6°C | 3 mm | 34% | 4.3 m/s | 7.8 |
| 2003 | 40.8°C | 32.2°C | 23.5°C | 44.6°C | 19.3°C | 6 mm | 44% | 4.7 m/s | 8.1 |
| 2002 | 41.3°C | 33.7°C | 26.1°C | 46.9°C | 21.4°C | 9 mm | 40% | 4.2 m/s | 8.2 |
| 2001 | 38.4°C | 30.7°C | 22.9°C | 43.5°C | 20.4°C | 0 mm | 45% | 4.7 m/s | 8.3 |
| 2000 | 40.6°C | 33.4°C | 26.3°C | 45.3°C | 24.1°C | 24 mm | 45% | 4.2 m/s | 7.8 |
| 1999 🌧️ | 38.0°C | 31.6°C | 25.2°C | 44.4°C | 20.7°C | 115 mm | 52% | 4 m/s | 7.4 |
| 1998 | 38.8°C | 32.3°C | 25.8°C | 44.7°C | 20.5°C | 43 mm | 50% | 4.5 m/s | 7.5 |
| 1997 | 41.8°C | 34.0°C | 26.3°C | 47.2°C | 23.4°C | 3 mm | 44% | 4.1 m/s | 8.2 |
| 1996 | 39.4°C | 32.2°C | 25.1°C | 45.3°C | 21.6°C | 30 mm | 43% | 4.3 m/s | 7.7 |
| 1995 | 37.4°C | 30.6°C | 23.8°C | 46.2°C | 18.9°C | 52 mm | 52% | 4.9 m/s | 7.4 |
| 1994 | 40.3°C | 33.4°C | 26.6°C | 45.3°C | 23.6°C | 45 mm | 45% | 3.8 m/s | 8 |
| 1993 | 41.0°C | 33.3°C | 25.5°C | 44.9°C | 20.2°C | 18 mm | 39% | 4.5 m/s | 7.9 |
| 1992 | 40.0°C | 31.6°C | 23.3°C | 47.1°C | 20.1°C | 0 mm | 38% | 4.6 m/s | 8.3 |
| 1991 | 41.4°C | 33.2°C | 25.1°C | 44.8°C | 21.2°C | 1 mm | 31% | 4.3 m/s | 8 |
| 1990 | 41.5°C | 33.2°C | 24.9°C | 46.9°C | 21.0°C | 1 mm | 38% | 4.7 m/s | 8.3 |
| 1989 | 40.8°C | 32.4°C | 24.0°C | 45.1°C | 19.7°C | 5 mm | 37% | 4.9 m/s | 8.3 |
| 1988 ❄️ | 37.1°C | 30.2°C | 23.4°C | 42.9°C | 19.0°C | 82 mm | 51% | 4.9 m/s | 7.6 |
| 1987 | 40.3°C | 32.1°C | 23.9°C | 46.2°C | 19.1°C | 3 mm | 37% | 4.9 m/s | 8.2 |
| 1986 | 42.2°C | 33.5°C | 24.8°C | 47.4°C | 19.8°C | 0 mm | 30% | 4.5 m/s | 8.2 |
| 1985 | 41.6°C | 33.0°C | 24.3°C | 46.0°C | 18.5°C | 1 mm | 34% | 4.6 m/s | 8.3 |
| 1984 | 39.0°C | 31.7°C | 24.4°C | 45.4°C | 19.9°C | 17 mm | 40% | 4.6 m/s | 7.5 |
| 1983 | 39.9°C | 33.0°C | 26.1°C | 45.3°C | 19.4°C | 12 mm | 41% | 4.3 m/s | — |
| 1982 | 41.2°C | 33.7°C | 26.2°C | 45.6°C | 22.4°C | 13 mm | 36% | 4.1 m/s | — |
| 1981 | 39.9°C | 32.3°C | 24.7°C | 47.5°C | 18.9°C | 14 mm | 44% | 4.5 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 40.4°C with lows near 25.2°C (mean 32.8°C), based on 45 years of NASA POWER data.
December averages 19 mm of rainfall in Roebourne, about average for rainfall. The wettest on record was 115 mm in 1999.
The hottest December reached 48.4°C in 2018. The coldest dipped to 18.5°C in 1985.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.4°C. Daytime highs moved from 40.3°C to 41.8°C and overnight lows from 25.1°C to 26.4°C over the same span.
December is one of the warmer months of the year in Roebourne and about average for rainfall, so plan for around 40.4°C daytime highs and 25.2°C at night.
Not quite — December is the 11th coolest month in Roebourne, averaging 32.8°C.
For December in Roebourne, pack light, breathable clothing and sun protection, with typical highs of 40.4°C and lows of 25.2°C.
Relative humidity in December averages 42% — relatively dry.
Average wind speed in December is 4.4 m/s. The windiest December on record averaged 5 m/s (2023).
The wettest December on record was 1999 with 115 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 Roebourne 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.
