December is one of the warmer months of the year in Gawler, with average highs near 29.6°C and lows around 13.5°C (mean 21.6°C). It is one of the drier months, averaging 24 mm of rainfall and 49% relative humidity across the period.
December is one of the warmer months of the year in Gawler. Across 45 years of records, the warmest December in Gawler was 2019 — when the month averaged 25°C — while the coldest was 2001 at 18.3°C. Typical December days reach 29.6°C with nights near 13.5°C. The long-term trend is warming, about 0.4°C per decade.
December is one of the drier months in Gawler, averaging 24 mm of rainfall. The wettest December on record was 2010 with 103 mm, while the driest were 2016, 2017 and 2018 at 0 mm.
Relative humidity in Gawler during December averages 49%. The most humid December was 1992 at 68%, and the least humid was 2015 at 37%.
December receives about 7.7 kWh/m²/day of solar energy in Gawler. The sunniest December was 2021 at 8.7 kWh/m²/day, and the cloudiest was 1992 at 6.4.
Average wind speed in Gawler during December is 3.3 m/s. The windiest Decembers were 2002 and 2005 at 3.8 m/s, while the calmest was 2009 at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.1°C | 20.8°C | 21.4°C | 22.7°C | 21.7°C | +0.6°C |
| Avg High | 29.3°C | 28.7°C | 29.3°C | 30.8°C | 30.0°C | +0.7°C |
| Avg Low | 13.0°C | 12.9°C | 13.5°C | 14.6°C | 13.5°C | +0.5°C |
| Avg Rain | 20 mm | 32 mm | 27 mm | 21 mm | 15 mm | -5 mm |
December temperatures in Gawler have risen by about 0.7°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 6.2°C (1987) to a record high of 47°C (2019).
Rainfall in December is one of the drier months, averaging 24 mm, with a wettest year of 103 mm.
One of the best times to visit Gawler
December is one of the best times to visit Gawler. Expect days averaging 29.6°C and nights around 13.5°C (mean 21.6°C) — warmer than Gawler's yearly average — with low rainfall (24 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 | 31.0°C | 22.4°C | 13.8°C | 41.9°C | 8.2°C | 18 mm | 41% | 3.3 m/s | — |
| 2024 | 30.8°C | 22.7°C | 14.5°C | 39.0°C | 10.2°C | 10 mm | 48% | 3.2 m/s | 8.2 |
| 2023 | 29.4°C | 21.6°C | 13.8°C | 41.5°C | 9.3°C | 22 mm | 52% | 3.6 m/s | 6.8 |
| 2022 | 28.9°C | 20.9°C | 12.9°C | 41.2°C | 7.6°C | 27 mm | 51% | 3.2 m/s | 8.1 |
| 2021 | 30.8°C | 22.0°C | 13.3°C | 40.7°C | 7.2°C | 4 mm | 46% | 3.2 m/s | 8.7 |
| 2020 | 28.8°C | 20.8°C | 12.8°C | 37.2°C | 8.9°C | 9 mm | 47% | 3.7 m/s | 8 |
| 2019 🔥 | 34.1°C | 25.0°C | 16.0°C | 47.0°C | 8.3°C | 1 mm | 38% | 3.3 m/s | 8.3 |
| 2018 | 33.4°C | 24.9°C | 16.5°C | 43.7°C | 10.0°C | 0 mm | 41% | 3.7 m/s | 7.4 |
| 2017 | 30.2°C | 22.2°C | 14.3°C | 41.8°C | 8.9°C | 0 mm | 46% | 3.3 m/s | 7.3 |
| 2016 | 30.7°C | 22.5°C | 14.4°C | 42.0°C | 7.8°C | 0 mm | 46% | 3.5 m/s | 7.5 |
| 2015 | 33.5°C | 24.9°C | 16.2°C | 43.9°C | 7.4°C | 31 mm | 37% | 3 m/s | 8.1 |
| 2014 | 29.2°C | 21.4°C | 13.7°C | 38.5°C | 9.6°C | 9 mm | 50% | 3.2 m/s | 7.9 |
| 2013 | 30.5°C | 22.4°C | 14.3°C | 43.0°C | 9.1°C | 23 mm | 45% | 3.2 m/s | 7.5 |
| 2012 | 30.3°C | 22.1°C | 14.0°C | 40.5°C | 9.5°C | 11 mm | 45% | 3.3 m/s | 8 |
| 2011 | 29.6°C | 21.6°C | 13.6°C | 39.0°C | 8.3°C | 34 mm | 49% | 3 m/s | 7.6 |
| 2010 🌧️ | 26.9°C | 20.1°C | 13.4°C | 40.0°C | 9.1°C | 103 mm | 59% | 3.3 m/s | 7.4 |
| 2009 | 30.2°C | 21.8°C | 13.3°C | 41.7°C | 7.8°C | 26 mm | 48% | 2.9 m/s | 8.2 |
| 2008 | 26.8°C | 19.9°C | 13.0°C | 35.8°C | 7.6°C | 58 mm | 57% | 3.3 m/s | 7.2 |
| 2007 | 30.2°C | 22.3°C | 14.3°C | 43.8°C | 8.7°C | 30 mm | 46% | 3.3 m/s | 7.7 |
| 2006 | 30.6°C | 21.9°C | 13.3°C | 42.8°C | 7.7°C | 23 mm | 40% | 3.5 m/s | 8.1 |
| 2005 | 28.6°C | 21.0°C | 13.4°C | 42.8°C | 10.1°C | 33 mm | 54% | 3.8 m/s | 7.6 |
| 2004 | 28.4°C | 20.8°C | 13.3°C | 39.4°C | 8.6°C | 41 mm | 54% | 3.3 m/s | 7.9 |
| 2003 | 31.5°C | 23.1°C | 14.8°C | 41.8°C | 8.7°C | 21 mm | 47% | 3.3 m/s | 7.7 |
| 2002 | 30.4°C | 22.1°C | 13.7°C | 42.3°C | 7.5°C | 17 mm | 44% | 3.8 m/s | 7.7 |
| 2001 ❄️ | 25.5°C | 18.3°C | 11.2°C | 35.8°C | 6.9°C | 15 mm | 59% | 3.3 m/s | 7.5 |
| 2000 | 31.2°C | 22.8°C | 14.4°C | 41.9°C | 9.5°C | 8 mm | 43% | 3.2 m/s | 7.9 |
| 1999 | 28.1°C | 20.4°C | 12.8°C | 38.5°C | 8.4°C | 32 mm | 52% | 3.3 m/s | 7.4 |
| 1998 | 30.8°C | 22.2°C | 13.7°C | 42.4°C | 9.1°C | 10 mm | 48% | 3.1 m/s | 7.8 |
| 1997 | 29.5°C | 21.3°C | 13.1°C | 37.3°C | 9.1°C | 36 mm | 54% | 3 m/s | 7.9 |
| 1996 | 28.5°C | 20.4°C | 12.3°C | 38.5°C | 8.9°C | 15 mm | 48% | 3.4 m/s | 7.7 |
| 1995 | 28.0°C | 19.9°C | 11.9°C | 37.3°C | 6.7°C | 28 mm | 49% | 3.4 m/s | 7.4 |
| 1994 | 32.2°C | 23.3°C | 14.4°C | 41.9°C | 7.1°C | 8 mm | 39% | 3.2 m/s | 8.3 |
| 1993 | 26.9°C | 19.6°C | 12.3°C | 37.5°C | 6.5°C | 44 mm | 55% | 3.4 m/s | 6.9 |
| 1992 | 26.3°C | 19.8°C | 13.3°C | 34.5°C | 10.1°C | 98 mm | 68% | 3.1 m/s | 6.4 |
| 1991 | 28.2°C | 20.2°C | 12.2°C | 39.0°C | 6.6°C | 5 mm | 50% | 3.4 m/s | 7.9 |
| 1990 | 28.8°C | 21.0°C | 13.2°C | 38.8°C | 7.9°C | 42 mm | 53% | 3.3 m/s | 7.3 |
| 1989 | 30.2°C | 21.9°C | 13.6°C | 41.5°C | 8.0°C | 19 mm | 47% | 3.3 m/s | 7.8 |
| 1988 | 30.0°C | 21.9°C | 13.9°C | 39.6°C | 8.3°C | 29 mm | 53% | 3.2 m/s | 7.5 |
| 1987 | 29.9°C | 21.3°C | 12.8°C | 39.8°C | 6.2°C | 28 mm | 47% | 3.4 m/s | 7.8 |
| 1986 | 26.9°C | 19.3°C | 11.7°C | 40.0°C | 7.3°C | 30 mm | 53% | 3.6 m/s | 7.3 |
| 1985 | 26.2°C | 18.9°C | 11.6°C | 38.7°C | 8.0°C | 32 mm | 56% | 3.7 m/s | 7.1 |
| 1984 | 29.2°C | 21.1°C | 13.1°C | 39.7°C | 8.6°C | 6 mm | 46% | 3.7 m/s | 7.5 |
| 1983 | 30.8°C | 22.4°C | 14.0°C | 41.3°C | 8.4°C | 23 mm | 47% | 3 m/s | — |
| 1982 | 31.2°C | 22.7°C | 14.2°C | 39.2°C | 8.0°C | 5 mm | 41% | 3.2 m/s | — |
| 1981 | 29.2°C | 20.8°C | 12.3°C | 41.4°C | 7.5°C | 8 mm | 48% | 3.3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 29.6°C with lows near 13.5°C (mean 21.6°C), based on 45 years of NASA POWER data.
December averages 24 mm of rainfall in Gawler, one of the drier months. The wettest on record was 103 mm in 2010.
The hottest December reached 47°C in 2019. The coldest dipped to 6.2°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.7°C. Daytime highs moved from 29.3°C to 30.2°C and overnight lows from 13°C to 13.7°C over the same span.
December is one of the warmer months of the year in Gawler and one of the drier months, so plan for around 29.6°C daytime highs and 13.5°C at night.
Not quite — December is the 10th coolest month in Gawler, averaging 21.6°C.
For December in Gawler, pack light layers you can adjust through the day, with typical highs of 29.6°C and lows of 13.5°C.
Relative humidity in December averages 49% — relatively dry.
Average wind speed in December is 3.3 m/s. The windiest December on record averaged 3.8 m/s (2002).
The wettest December on record was 2010 with 103 mm. On average, December sees 24 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 Gawler 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.
