December is one of the warmer months of the year in Karratha, with average highs near 31°C and lows around 26.4°C (mean 28.7°C). It is about average for rainfall, averaging 17 mm of rainfall and 68% relative humidity across the period.
December is one of the warmer months of the year in Karratha. Across 45 years of records, the warmest December in Karratha was 2019 — when the month averaged 31°C — while the coldest was 2001 at 26.8°C. Typical December days reach 31°C with nights near 26.4°C. The long-term trend is warming, about 0.3°C per decade.
December is about average for rainfall in Karratha, averaging 17 mm of rainfall. The wettest December on record was 1999 with 145 mm, while the driest were 1992 and 2001 at 0 mm.
Relative humidity in Karratha during December averages 68%. The most humid December was 2010 at 73%, and the least humid was 2019 at 63%.
December receives about 8 kWh/m²/day of solar energy in Karratha. The sunniest December was 2001 at 8.4 kWh/m²/day, and the cloudiest was 2012 at 7.1.
Average wind speed in Karratha during December is 5.2 m/s. The windiest December was 2023 at 6.1 m/s, while the calmest was 2012 at 4.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.3°C | 28.6°C | 28.5°C | 28.8°C | 29.7°C | +1.4°C |
| Avg High | 30.8°C | 30.9°C | 30.8°C | 30.9°C | 32.0°C | +1.2°C |
| Avg Low | 25.9°C | 26.3°C | 26.2°C | 26.7°C | 27.4°C | +1.5°C |
| Avg Rain | 11 mm | 31 mm | 6 mm | 19 mm | 17 mm | +5 mm |
December temperatures in Karratha have risen by about 1°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 21.6°C (2018) to a record high of 39.9°C (1981).
Rainfall in December is about average for rainfall, averaging 17 mm, with a wettest year of 145 mm.
A good time to visit Karratha
December is a good time to visit Karratha, with days averaging 31°C and nights around 26.4°C (mean 28.7°C, warmer than Karratha's yearly average) and low rainfall. August and July are marginally more temperate, but December still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 33.2°C | 30.6°C | 28.0°C | 38.1°C | 25.6°C | 2 mm | 65% | 4.8 m/s | — |
| 2024 | 32.8°C | 30.9°C | 29.0°C | 37.9°C | 25.4°C | 47 mm | 70% | 4.4 m/s | 7.5 |
| 2023 | 30.8°C | 28.4°C | 25.9°C | 37.4°C | 24.2°C | 0 mm | 68% | 6.1 m/s | 8.3 |
| 2022 | 30.6°C | 28.4°C | 26.2°C | 35.6°C | 24.3°C | 1 mm | 69% | 5.7 m/s | 8.1 |
| 2021 | 33.0°C | 30.4°C | 27.7°C | 38.9°C | 26.1°C | 1 mm | 64% | 5.4 m/s | 8.1 |
| 2020 | 31.6°C | 29.6°C | 27.6°C | 35.1°C | 25.5°C | 49 mm | 70% | 4.6 m/s | 7.8 |
| 2019 🔥 | 33.6°C | 31.0°C | 28.4°C | 39.0°C | 26.5°C | 3 mm | 63% | 4.5 m/s | 8 |
| 2018 | 30.1°C | 27.6°C | 25.2°C | 36.2°C | 21.6°C | 0 mm | 70% | 5.3 m/s | 8.2 |
| 2017 | 30.5°C | 28.6°C | 26.7°C | 33.6°C | 24.1°C | 20 mm | 71% | 4.9 m/s | 7.7 |
| 2016 | 30.9°C | 29.2°C | 27.5°C | 33.3°C | 25.1°C | 26 mm | 69% | 5 m/s | 7.7 |
| 2015 | 30.1°C | 28.0°C | 25.8°C | 33.8°C | 24.2°C | 1 mm | 69% | 6 m/s | 8.1 |
| 2014 | 31.0°C | 28.7°C | 26.4°C | 36.1°C | 23.6°C | 1 mm | 67% | 5.2 m/s | 8.2 |
| 2013 | 30.8°C | 28.7°C | 26.6°C | 36.4°C | 24.1°C | 86 mm | 70% | 5.2 m/s | 7.8 |
| 2012 | 31.4°C | 29.6°C | 27.7°C | 34.8°C | 25.3°C | 18 mm | 69% | 4.1 m/s | 7.1 |
| 2011 | 29.9°C | 28.0°C | 26.0°C | 34.2°C | 24.1°C | 0 mm | 72% | 5.8 m/s | 8.2 |
| 2010 | 30.2°C | 28.6°C | 27.0°C | 34.5°C | 25.6°C | 34 mm | 73% | 5.3 m/s | 7.6 |
| 2009 | 32.2°C | 29.5°C | 26.8°C | 37.2°C | 24.4°C | 13 mm | 66% | 5.4 m/s | 8.1 |
| 2008 | 29.9°C | 27.7°C | 25.5°C | 32.6°C | 23.2°C | 5 mm | 67% | 5.3 m/s | 8 |
| 2007 | 30.4°C | 28.1°C | 25.9°C | 37.4°C | 23.6°C | 3 mm | 67% | 5.4 m/s | 8 |
| 2006 | 32.0°C | 29.5°C | 27.1°C | 36.2°C | 24.1°C | 7 mm | 63% | 4.7 m/s | 8.3 |
| 2005 | 30.6°C | 28.4°C | 26.2°C | 35.0°C | 24.2°C | 12 mm | 68% | 4.7 m/s | 8 |
| 2004 | 32.2°C | 29.6°C | 27.0°C | 36.3°C | 24.1°C | 1 mm | 65% | 4.9 m/s | 7.9 |
| 2003 | 29.5°C | 27.2°C | 24.8°C | 35.3°C | 22.6°C | 2 mm | 72% | 5.6 m/s | 8.2 |
| 2002 | 31.7°C | 29.3°C | 26.9°C | 38.9°C | 24.4°C | 8 mm | 68% | 4.8 m/s | 8.2 |
| 2001 ❄️ | 28.8°C | 26.8°C | 24.8°C | 32.8°C | 23.6°C | 0 mm | 70% | 5.8 m/s | 8.4 |
| 2000 | 31.1°C | 28.9°C | 26.7°C | 36.6°C | 25.2°C | 7 mm | 71% | 5.1 m/s | 8 |
| 1999 🌧️ | 30.9°C | 28.9°C | 26.9°C | 35.2°C | 23.8°C | 145 mm | 70% | 4.7 m/s | 7.7 |
| 1998 | 31.0°C | 28.9°C | 26.8°C | 36.7°C | 24.0°C | 35 mm | 72% | 5.3 m/s | 7.6 |
| 1997 | 31.5°C | 29.2°C | 26.8°C | 39.1°C | 24.8°C | 3 mm | 72% | 4.7 m/s | 8.2 |
| 1996 | 31.4°C | 29.1°C | 26.7°C | 39.8°C | 23.8°C | 25 mm | 67% | 5 m/s | 7.9 |
| 1995 | 29.3°C | 27.4°C | 25.4°C | 34.7°C | 22.6°C | 70 mm | 73% | 5.9 m/s | 7.5 |
| 1994 | 32.1°C | 29.9°C | 27.7°C | 36.3°C | 26.0°C | 25 mm | 68% | 4.3 m/s | 8.1 |
| 1993 | 31.4°C | 28.9°C | 26.4°C | 35.0°C | 23.2°C | 10 mm | 66% | 5.3 m/s | 8.1 |
| 1992 | 29.9°C | 27.4°C | 24.8°C | 35.4°C | 23.3°C | 0 mm | 66% | 5.6 m/s | 8.3 |
| 1991 | 30.6°C | 28.0°C | 25.4°C | 34.7°C | 23.7°C | 1 mm | 65% | 5.2 m/s | 8 |
| 1990 | 31.1°C | 28.6°C | 26.2°C | 34.8°C | 24.0°C | 0 mm | 67% | 5.4 m/s | 8.2 |
| 1989 | 30.2°C | 27.8°C | 25.3°C | 37.3°C | 22.7°C | 2 mm | 66% | 6 m/s | 8.2 |
| 1988 | 29.9°C | 27.7°C | 25.6°C | 33.7°C | 22.7°C | 61 mm | 71% | 5.8 m/s | 7.5 |
| 1987 | 30.0°C | 27.5°C | 25.0°C | 37.1°C | 22.4°C | 2 mm | 65% | 5.6 m/s | 8.3 |
| 1986 | 31.2°C | 28.4°C | 25.5°C | 38.7°C | 23.0°C | 0 mm | 64% | 5.2 m/s | 8.2 |
| 1985 | 31.2°C | 28.3°C | 25.5°C | 37.2°C | 22.6°C | 1 mm | 63% | 5.3 m/s | 8.3 |
| 1984 | 30.4°C | 28.2°C | 26.0°C | 37.9°C | 23.1°C | 16 mm | 64% | 5.5 m/s | 7.7 |
| 1983 | 31.2°C | 29.0°C | 26.8°C | 37.5°C | 22.9°C | 3 mm | 66% | 4.9 m/s | — |
| 1982 | 32.3°C | 29.9°C | 27.5°C | 39.1°C | 25.2°C | 6 mm | 64% | 5 m/s | — |
| 1981 | 30.6°C | 28.3°C | 25.9°C | 39.9°C | 22.3°C | 11 mm | 70% | 5.2 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 31°C with lows near 26.4°C (mean 28.7°C), based on 45 years of NASA POWER data.
December averages 17 mm of rainfall in Karratha, about average for rainfall. The wettest on record was 145 mm in 1999.
The hottest December reached 39.9°C in 1981. The coldest dipped to 21.6°C in 2018.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1°C. Daytime highs moved from 31.1°C to 32.1°C and overnight lows from 26.3°C to 27.4°C over the same span.
December is one of the warmer months of the year in Karratha and about average for rainfall, so plan for around 31°C daytime highs and 26.4°C at night.
Not quite — December is the 8th coolest month in Karratha, averaging 28.7°C.
For December in Karratha, pack light, breathable clothing and sun protection, with typical highs of 31°C and lows of 26.4°C.
Relative humidity in December averages 68% — moderately humid.
Average wind speed in December is 5.2 m/s. The windiest December on record averaged 6.1 m/s (2023).
The wettest December on record was 1999 with 145 mm. On average, December sees 17 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 Karratha 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.
