December is one of the warmer months of the year in Kalgoorlie, with average highs near 34.2°C and lows around 16.3°C (mean 25.3°C). It is about average for rainfall, averaging 21 mm of rainfall and 36% relative humidity across the period.
December is one of the warmer months of the year in Kalgoorlie. Across 45 years of records, the warmest December in Kalgoorlie was 2019 — when the month averaged 29.8°C — while the coldest was 1988 at 22.6°C. Typical December days reach 34.2°C with nights near 16.3°C. The long-term trend is warming, about 0.4°C per decade.
December is about average for rainfall in Kalgoorlie, averaging 21 mm of rainfall. The wettest December on record was 1988 with 81 mm, while the driest was 2005 at 2 mm.
Relative humidity in Kalgoorlie during December averages 36%. The most humid December was 2011 at 46%, and the least humid was 2005 at 27%.
December receives about 8.3 kWh/m²/day of solar energy in Kalgoorlie. The sunniest December was 1985 at 9.3 kWh/m²/day, and the cloudiest was 2011 at 7.2.
Average wind speed in Kalgoorlie during December is 4 m/s. The windiest December was 2023 at 4.7 m/s, while the calmest was 1982 at 3.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.9°C | 24.8°C | 25.2°C | 25.7°C | 26.1°C | +1.2°C |
| Avg High | 33.7°C | 33.7°C | 34.3°C | 34.6°C | 35.2°C | +1.5°C |
| Avg Low | 16.0°C | 15.8°C | 16.2°C | 16.7°C | 17.0°C | +1°C |
| Avg Rain | 29 mm | 23 mm | 20 mm | 24 mm | 6 mm | -22 mm |
December temperatures in Kalgoorlie have risen by about 1.4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 8.2°C (1992) to a record high of 45.7°C (2013).
Rainfall in December is about average for rainfall, averaging 21 mm, with a wettest year of 81 mm.
A good time to visit Kalgoorlie
December is a good time to visit Kalgoorlie, with days averaging 34.2°C and nights around 16.3°C (mean 25.3°C, warmer than Kalgoorlie's yearly average) and low rainfall. November and March 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 | 35.9°C | 26.3°C | 16.8°C | 42.2°C | 10.2°C | 7 mm | 31% | 4.3 m/s | — |
| 2024 | 36.2°C | 27.3°C | 18.5°C | 41.7°C | 12.4°C | 10 mm | 36% | 3.8 m/s | 8.6 |
| 2023 | 36.2°C | 26.8°C | 17.4°C | 42.9°C | 10.0°C | 6 mm | 33% | 4.7 m/s | 8.3 |
| 2022 | 34.0°C | 25.1°C | 16.2°C | 42.2°C | 11.5°C | 3 mm | 35% | 4.2 m/s | 8.3 |
| 2021 | 35.3°C | 26.1°C | 16.8°C | 42.7°C | 11.5°C | 6 mm | 32% | 4.2 m/s | 8.8 |
| 2020 | 33.8°C | 24.9°C | 16.1°C | 42.5°C | 9.5°C | 7 mm | 32% | 4.3 m/s | 8.3 |
| 2019 🔥 | 38.8°C | 29.8°C | 20.8°C | 45.7°C | 11.5°C | 13 mm | 30% | 3.6 m/s | 8.1 |
| 2018 | 34.8°C | 25.7°C | 16.7°C | 42.8°C | 12.4°C | 19 mm | 40% | 3.7 m/s | 8.3 |
| 2017 | 34.9°C | 25.8°C | 16.8°C | 43.5°C | 11.2°C | 4 mm | 31% | 4.2 m/s | 8.1 |
| 2016 | 33.7°C | 24.6°C | 15.4°C | 41.4°C | 10.0°C | 51 mm | 37% | 4.1 m/s | 8.5 |
| 2015 | 34.4°C | 25.1°C | 15.8°C | 41.3°C | 10.6°C | 34 mm | 37% | 4.2 m/s | 8.5 |
| 2014 | 34.1°C | 24.8°C | 15.5°C | 43.6°C | 11.6°C | 4 mm | 37% | 4.2 m/s | 8.7 |
| 2013 | 34.7°C | 25.6°C | 16.5°C | 45.7°C | 9.2°C | 39 mm | 35% | 3.8 m/s | 8.1 |
| 2012 | 35.0°C | 26.3°C | 17.5°C | 41.6°C | 9.9°C | 12 mm | 38% | 3.6 m/s | 8.1 |
| 2011 | 32.0°C | 23.9°C | 15.9°C | 40.7°C | 10.8°C | 39 mm | 46% | 3.7 m/s | 7.2 |
| 2010 | 33.7°C | 24.9°C | 16.1°C | 43.4°C | 10.3°C | 22 mm | 36% | 4 m/s | 7.6 |
| 2009 | 35.1°C | 25.7°C | 16.4°C | 43.0°C | 9.5°C | 25 mm | 34% | 3.9 m/s | 8.4 |
| 2008 | 33.8°C | 24.8°C | 15.8°C | 40.9°C | 9.5°C | 31 mm | 41% | 4 m/s | 8.6 |
| 2007 | 32.1°C | 23.6°C | 15.2°C | 43.4°C | 10.4°C | 26 mm | 38% | 4.1 m/s | 7.9 |
| 2006 | 34.1°C | 25.3°C | 16.6°C | 40.6°C | 11.8°C | 40 mm | 36% | 4 m/s | 8.3 |
| 2005 | 34.6°C | 25.0°C | 15.4°C | 44.1°C | 10.2°C | 2 mm | 27% | 4 m/s | 9 |
| 2004 | 35.4°C | 26.3°C | 17.2°C | 43.7°C | 11.2°C | 19 mm | 32% | 4.1 m/s | 8.3 |
| 2003 | 36.0°C | 26.3°C | 16.5°C | 41.9°C | 10.4°C | 16 mm | 36% | 4.1 m/s | 8.9 |
| 2002 | 34.9°C | 25.9°C | 16.9°C | 42.9°C | 9.1°C | 30 mm | 35% | 4.1 m/s | 8.1 |
| 2001 | 31.0°C | 22.7°C | 14.4°C | 40.4°C | 9.6°C | 5 mm | 41% | 4.2 m/s | 7.9 |
| 2000 | 35.9°C | 26.8°C | 17.7°C | 42.5°C | 11.4°C | 3 mm | 34% | 3.9 m/s | 8.5 |
| 1999 | 32.6°C | 24.2°C | 15.8°C | 40.4°C | 10.8°C | 9 mm | 38% | 4.1 m/s | 8.1 |
| 1998 | 33.5°C | 24.9°C | 16.3°C | 40.5°C | 9.2°C | 35 mm | 42% | 3.8 m/s | 8.1 |
| 1997 | 35.8°C | 26.3°C | 16.9°C | 44.0°C | 10.0°C | 15 mm | 34% | 4.1 m/s | 8.5 |
| 1996 | 33.1°C | 24.1°C | 15.2°C | 40.4°C | 11.4°C | 23 mm | 36% | 4 m/s | 8.4 |
| 1995 | 32.7°C | 23.9°C | 15.0°C | 43.5°C | 10.1°C | 40 mm | 41% | 4.3 m/s | 8.1 |
| 1994 | 35.3°C | 26.2°C | 17.1°C | 41.7°C | 10.7°C | 34 mm | 33% | 3.8 m/s | 8.2 |
| 1993 | 32.4°C | 23.7°C | 15.0°C | 40.6°C | 9.8°C | 11 mm | 39% | 4.3 m/s | 8.3 |
| 1992 | 32.4°C | 23.2°C | 14.0°C | 41.3°C | 8.2°C | 3 mm | 36% | 3.9 m/s | 8 |
| 1991 | 34.0°C | 25.5°C | 16.9°C | 40.5°C | 12.2°C | 46 mm | 35% | 3.8 m/s | 8.1 |
| 1990 | 35.0°C | 25.5°C | 16.0°C | 42.5°C | 8.9°C | 12 mm | 33% | 4 m/s | 8.9 |
| 1989 | 35.7°C | 26.4°C | 17.0°C | 44.3°C | 10.6°C | 6 mm | 31% | 4.2 m/s | 8.6 |
| 1988 ❄️ 🌧️ | 30.8°C | 22.6°C | 14.5°C | 41.7°C | 9.2°C | 81 mm | 46% | 4.1 m/s | 7.3 |
| 1987 | 34.9°C | 25.9°C | 16.8°C | 39.9°C | 9.6°C | 31 mm | 35% | 4 m/s | 8.4 |
| 1986 | 34.0°C | 24.8°C | 15.5°C | 43.4°C | 8.5°C | 14 mm | 34% | 4 m/s | 8.8 |
| 1985 | 32.7°C | 23.6°C | 14.5°C | 40.1°C | 9.9°C | 3 mm | 30% | 4 m/s | 9.3 |
| 1984 | 34.6°C | 25.3°C | 16.0°C | 42.5°C | 10.2°C | 12 mm | 32% | 3.9 m/s | 8.6 |
| 1983 | 33.2°C | 25.1°C | 16.9°C | 41.3°C | 9.6°C | 59 mm | 46% | 4 m/s | — |
| 1982 | 35.1°C | 26.7°C | 18.3°C | 41.2°C | 11.0°C | 23 mm | 36% | 3.4 m/s | — |
| 1981 | 32.5°C | 23.6°C | 14.8°C | 37.2°C | 9.2°C | 28 mm | 35% | 4 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 34.2°C with lows near 16.3°C (mean 25.3°C), based on 45 years of NASA POWER data.
December averages 21 mm of rainfall in Kalgoorlie, about average for rainfall. The wettest on record was 81 mm in 1988.
The hottest December reached 45.7°C in 2013. The coldest dipped to 8.2°C in 1992.
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 33.6°C to 35.5°C and overnight lows from 16.1°C to 17.1°C over the same span.
December is one of the warmer months of the year in Kalgoorlie and about average for rainfall, so plan for around 34.2°C daytime highs and 16.3°C at night.
Not quite — December is the 10th coolest month in Kalgoorlie, averaging 25.3°C.
For December in Kalgoorlie, pack light, breathable clothing and sun protection, with typical highs of 34.2°C and lows of 16.3°C.
Relative humidity in December averages 36% — relatively dry.
Average wind speed in December is 4 m/s. The windiest December on record averaged 4.7 m/s (2023).
The wettest December on record was 1988 with 81 mm. On average, December sees 21 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 Kalgoorlie 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.
