December is one of the warmer months of the year in Geraldton, with average highs near 23.5°C and lows around 20.2°C (mean 21.9°C). It is one of the drier months, averaging 5 mm of rainfall and 74% relative humidity across the period.
December is one of the warmer months of the year in Geraldton. Across 45 years of records, the warmest December in Geraldton was 1999 — when the month averaged 23.5°C — while the coldest was 2005 at 19.4°C. Typical December days reach 23.5°C with nights near 20.2°C. The long-term trend is warming, about 0.4°C per decade.
December is one of the drier months in Geraldton, averaging 5 mm of rainfall. The wettest December on record was 2010 with 33 mm, while the driest were 2003, 2020 and 2021, among others at 0 mm.
Relative humidity in Geraldton during December averages 74%. The most humid December was 1991 at 78%, and the least humid was 1996 at 70%.
December receives about 8.4 kWh/m²/day of solar energy in Geraldton. The sunniest Decembers were 2016, 2019 and 2020 at 8.8 kWh/m²/day, and the cloudiest was 2010 at 7.7.
Average wind speed in Geraldton during December is 6.8 m/s. The windiest Decembers were 1996 and 2000 at 7.7 m/s, while the calmest was 2012 at 5.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.1°C | 22.0°C | 21.5°C | 22.2°C | 22.8°C | +1.7°C |
| Avg High | 22.5°C | 23.7°C | 23.2°C | 23.9°C | 24.6°C | +2.1°C |
| Avg Low | 19.6°C | 20.3°C | 19.9°C | 20.5°C | 21.0°C | +1.4°C |
| Avg Rain | 5 mm | 6 mm | 4 mm | 9 mm | 1 mm | -4 mm |
December temperatures in Geraldton have risen by about 1.8°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 16.3°C (2020) to a record high of 36.5°C (2024).
Rainfall in December is one of the drier months, averaging 5 mm, with a wettest year of 33 mm.
One of the best times to visit Geraldton
December is one of the best times to visit Geraldton. Expect days averaging 23.5°C and nights around 20.2°C (mean 21.9°C) — warmer than Geraldton's yearly average — with low rainfall (5 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 | 24.7°C | 22.9°C | 21.0°C | 33.4°C | 19.3°C | 2 mm | 72% | 7.2 m/s | — |
| 2024 | 24.6°C | 22.9°C | 21.2°C | 36.5°C | 19.1°C | 2 mm | 75% | 6.5 m/s | 8.4 |
| 2023 | 25.0°C | 23.2°C | 21.4°C | 29.8°C | 20.0°C | 0 mm | 73% | 6.3 m/s | 8.6 |
| 2022 | 24.2°C | 22.5°C | 20.8°C | 30.1°C | 18.3°C | 0 mm | 72% | 6.6 m/s | 8.7 |
| 2021 | 24.5°C | 22.6°C | 20.8°C | 36.3°C | 18.3°C | 0 mm | 73% | 6.7 m/s | 8.7 |
| 2020 | 24.8°C | 22.7°C | 20.6°C | 33.3°C | 16.3°C | 0 mm | 72% | 6.8 m/s | 8.8 |
| 2019 | 25.2°C | 23.4°C | 21.7°C | 33.7°C | 19.8°C | 2 mm | 73% | 6 m/s | 8.8 |
| 2018 | 22.3°C | 20.9°C | 19.4°C | 32.4°C | 17.1°C | 7 mm | 77% | 7 m/s | 8 |
| 2017 | 24.0°C | 22.3°C | 20.6°C | 29.5°C | 19.0°C | 20 mm | 74% | 6.9 m/s | 8.3 |
| 2016 | 22.7°C | 21.1°C | 19.6°C | 29.4°C | 18.2°C | 2 mm | 74% | 7.6 m/s | 8.8 |
| 2015 | 23.6°C | 21.7°C | 19.7°C | 33.4°C | 17.9°C | 6 mm | 73% | 7.1 m/s | 8.5 |
| 2014 | 23.0°C | 21.4°C | 19.8°C | 29.2°C | 18.3°C | 0 mm | 74% | 7.3 m/s | 8.6 |
| 2013 | 24.8°C | 22.9°C | 21.0°C | 31.8°C | 18.2°C | 5 mm | 71% | 6.6 m/s | 8.5 |
| 2012 | 24.3°C | 22.5°C | 20.6°C | 30.8°C | 17.3°C | 15 mm | 75% | 5.9 m/s | 8.1 |
| 2011 | 24.5°C | 23.0°C | 21.5°C | 29.9°C | 20.1°C | 5 mm | 74% | 6.3 m/s | 8 |
| 2010 🌧️ | 24.1°C | 22.6°C | 21.0°C | 33.2°C | 18.3°C | 33 mm | 75% | 7 m/s | 7.7 |
| 2009 | 24.6°C | 22.6°C | 20.5°C | 32.1°C | 18.5°C | 2 mm | 71% | 6.9 m/s | 8.3 |
| 2008 | 22.2°C | 20.9°C | 19.5°C | 27.0°C | 18.1°C | 3 mm | 76% | 7.2 m/s | 8.7 |
| 2007 | 23.3°C | 21.7°C | 20.1°C | 33.4°C | 17.0°C | 29 mm | 72% | 6.9 m/s | 8 |
| 2006 | 24.4°C | 22.5°C | 20.7°C | 31.2°C | 17.3°C | 4 mm | 72% | 6.8 m/s | 8.6 |
| 2005 ❄️ | 20.5°C | 19.4°C | 18.4°C | 24.7°C | 17.3°C | 0 mm | 76% | 6.7 m/s | 8.7 |
| 2004 | 23.8°C | 21.9°C | 20.1°C | 32.7°C | 17.9°C | 0 mm | 75% | 6.1 m/s | 8.7 |
| 2003 | 22.7°C | 21.0°C | 19.3°C | 32.4°C | 16.5°C | 0 mm | 76% | 7.4 m/s | 8.5 |
| 2002 | 23.4°C | 21.7°C | 20.0°C | 33.6°C | 16.4°C | 1 mm | 76% | 6.2 m/s | 8.4 |
| 2001 | 22.6°C | 21.3°C | 19.9°C | 27.3°C | 18.0°C | 4 mm | 73% | 7.2 m/s | 8.7 |
| 2000 | 24.2°C | 22.2°C | 20.2°C | 33.4°C | 17.5°C | 0 mm | 74% | 7.7 m/s | 8.5 |
| 1999 🔥 | 25.3°C | 23.5°C | 21.6°C | 33.1°C | 19.1°C | 7 mm | 73% | 6.4 m/s | 8.6 |
| 1998 | 23.9°C | 22.2°C | 20.5°C | 32.5°C | 17.7°C | 18 mm | 76% | 6.8 m/s | 8.3 |
| 1997 | 23.8°C | 22.0°C | 20.2°C | 33.3°C | 18.5°C | 0 mm | 75% | 7.3 m/s | 8.5 |
| 1996 | 23.9°C | 22.3°C | 20.8°C | 33.8°C | 18.1°C | 5 mm | 70% | 7.7 m/s | 8.5 |
| 1995 | 23.6°C | 22.1°C | 20.6°C | 29.0°C | 19.1°C | 6 mm | 72% | 6.9 m/s | 8.4 |
| 1994 | 24.6°C | 22.7°C | 20.8°C | 30.7°C | 18.6°C | 0 mm | 72% | 6.7 m/s | 8.3 |
| 1993 | 23.7°C | 21.8°C | 19.9°C | 32.5°C | 17.7°C | 0 mm | 71% | 7.2 m/s | 8.6 |
| 1992 | 23.1°C | 21.4°C | 19.6°C | 28.9°C | 18.0°C | 2 mm | 72% | 7 m/s | 8.5 |
| 1991 | 21.8°C | 20.4°C | 19.0°C | 27.8°C | 17.3°C | 18 mm | 78% | 6.3 m/s | 7.9 |
| 1990 | 22.9°C | 21.5°C | 20.2°C | 31.4°C | 18.1°C | 2 mm | 74% | 6.6 m/s | 8.3 |
| 1989 | 22.4°C | 20.9°C | 19.5°C | 30.3°C | 18.3°C | 1 mm | 74% | 6.7 m/s | 8.3 |
| 1988 | 23.7°C | 22.2°C | 20.6°C | 27.1°C | 17.7°C | 13 mm | 74% | 6.9 m/s | 8.4 |
| 1987 | 22.1°C | 20.7°C | 19.3°C | 28.7°C | 17.0°C | 0 mm | 78% | 6.5 m/s | 7.9 |
| 1986 | 22.0°C | 20.6°C | 19.2°C | 26.6°C | 17.2°C | 3 mm | 76% | 6.6 m/s | 8.4 |
| 1985 | 21.9°C | 20.4°C | 19.0°C | 29.5°C | 17.3°C | 3 mm | 70% | 6.6 m/s | 8.6 |
| 1984 | 21.7°C | 20.4°C | 19.2°C | 26.8°C | 17.6°C | 5 mm | 73% | 7.1 m/s | 7.9 |
| 1983 | 23.3°C | 21.8°C | 20.2°C | 29.3°C | 17.8°C | 14 mm | 77% | 6.2 m/s | — |
| 1982 | 22.3°C | 21.2°C | 20.0°C | 25.6°C | 18.2°C | 2 mm | 77% | 6.2 m/s | — |
| 1981 | 23.0°C | 21.3°C | 19.7°C | 31.1°C | 17.9°C | 3 mm | 72% | 7.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 23.5°C with lows near 20.2°C (mean 21.9°C), based on 45 years of NASA POWER data.
December averages 5 mm of rainfall in Geraldton, one of the drier months. The wettest on record was 33 mm in 2010.
The hottest December reached 36.5°C in 2024. The coldest dipped to 16.3°C in 2020.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.8°C. Daytime highs moved from 22.4°C to 24.6°C and overnight lows from 19.6°C to 21°C over the same span.
December is one of the warmer months of the year in Geraldton and one of the drier months, so plan for around 23.5°C daytime highs and 20.2°C at night.
Not quite — December is the 8th coolest month in Geraldton, averaging 21.9°C.
For December in Geraldton, pack light layers you can adjust through the day, with typical highs of 23.5°C and lows of 20.2°C.
Relative humidity in December averages 74% — moderately humid.
Average wind speed in December is 6.8 m/s. The windiest December on record averaged 7.7 m/s (1996).
The wettest December on record was 2010 with 33 mm. On average, December sees 5 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 Geraldton 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.
