December is one of the warmer months of the year in Southern Cross, with average highs near 33.7°C and lows around 16.1°C (mean 24.9°C). It is about average for rainfall, averaging 17 mm of rainfall and 36% relative humidity across the period.
December is one of the warmer months of the year in Southern Cross. Across 45 years of records, the warmest December in Southern Cross was 2019 — when the month averaged 29.2°C — while the coldest was 1985 at 22.2°C. Typical December days reach 33.7°C with nights near 16.1°C. The long-term trend is warming, about 0.5°C per decade.
December is about average for rainfall in Southern Cross, averaging 17 mm of rainfall. The wettest December on record was 2011 with 76 mm, while the driest was 2005 at 1 mm.
Relative humidity in Southern Cross during December averages 36%. The most humid December was 1983 at 49%, and the least humid was 2019 at 30%.
December receives about 8.5 kWh/m²/day of solar energy in Southern Cross. The sunniest December was 1985 at 9.1 kWh/m²/day, and the cloudiest was 2010 at 7.4.
Average wind speed in Southern Cross during December is 4 m/s. The windiest December was 2023 at 4.5 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 | 24.1°C | 24.6°C | 24.8°C | 25.3°C | 26.0°C | +1.9°C |
| Avg High | 32.8°C | 33.3°C | 33.7°C | 34.1°C | 34.9°C | +2.1°C |
| Avg Low | 15.4°C | 15.8°C | 15.8°C | 16.6°C | 17.0°C | +1.6°C |
| Avg Rain | 24 mm | 17 mm | 14 mm | 21 mm | 5 mm | -19 mm |
December temperatures in Southern Cross have risen by about 2.4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 8°C (2020) to a record high of 44.5°C (2007).
Rainfall in December is about average for rainfall, averaging 17 mm, with a wettest year of 76 mm.
One of the best times to visit Southern Cross
December is one of the best times to visit Southern Cross. Expect days averaging 33.7°C and nights around 16.1°C (mean 24.9°C) — warmer than Southern Cross's yearly average — with low rainfall (17 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 | 35.4°C | 26.3°C | 17.1°C | 41.8°C | 10.3°C | 9 mm | 32% | 4.3 m/s | — |
| 2024 | 36.0°C | 27.2°C | 18.3°C | 41.4°C | 11.1°C | 7 mm | 35% | 3.9 m/s | 8.6 |
| 2023 | 35.7°C | 26.6°C | 17.6°C | 41.8°C | 11.0°C | 4 mm | 33% | 4.5 m/s | 8.4 |
| 2022 | 33.5°C | 24.9°C | 16.2°C | 40.1°C | 10.8°C | 3 mm | 35% | 4.1 m/s | 8.6 |
| 2021 | 34.9°C | 25.8°C | 16.7°C | 39.5°C | 10.8°C | 4 mm | 33% | 4.1 m/s | 8.8 |
| 2020 | 33.8°C | 25.1°C | 16.3°C | 42.1°C | 8.0°C | 3 mm | 31% | 4.2 m/s | 8.7 |
| 2019 🔥 | 38.4°C | 29.2°C | 19.9°C | 44.5°C | 10.8°C | 4 mm | 30% | 3.8 m/s | 8.7 |
| 2018 | 34.2°C | 25.4°C | 16.7°C | 40.6°C | 11.0°C | 21 mm | 38% | 3.6 m/s | 8.4 |
| 2017 | 33.8°C | 25.1°C | 16.4°C | 42.1°C | 10.6°C | 5 mm | 34% | 4.1 m/s | 8.3 |
| 2016 | 33.4°C | 24.3°C | 15.3°C | 41.6°C | 9.6°C | 28 mm | 37% | 4.2 m/s | 8.6 |
| 2015 | 33.6°C | 24.7°C | 15.9°C | 41.7°C | 9.6°C | 11 mm | 36% | 4 m/s | 8.4 |
| 2014 | 33.5°C | 24.4°C | 15.4°C | 41.8°C | 11.1°C | 6 mm | 37% | 4.1 m/s | 8.9 |
| 2013 | 35.0°C | 26.0°C | 17.0°C | 44.1°C | 10.0°C | 13 mm | 33% | 3.8 m/s | 8.5 |
| 2012 | 34.2°C | 25.7°C | 17.2°C | 42.0°C | 9.0°C | 33 mm | 40% | 3.5 m/s | 8.3 |
| 2011 🌧️ | 31.6°C | 23.8°C | 16.0°C | 40.7°C | 11.3°C | 76 mm | 48% | 3.8 m/s | 7.5 |
| 2010 | 32.8°C | 24.5°C | 16.1°C | 42.5°C | 9.8°C | 15 mm | 37% | 4 m/s | 7.4 |
| 2009 | 34.8°C | 25.6°C | 16.3°C | 43.9°C | 9.8°C | 13 mm | 33% | 3.9 m/s | 8.6 |
| 2008 | 33.2°C | 24.3°C | 15.3°C | 40.9°C | 9.5°C | 7 mm | 41% | 3.9 m/s | 8.5 |
| 2007 | 31.7°C | 23.4°C | 15.1°C | 44.5°C | 8.8°C | 34 mm | 39% | 4.2 m/s | 7.9 |
| 2006 | 34.0°C | 25.3°C | 16.7°C | 40.3°C | 10.8°C | 25 mm | 36% | 3.9 m/s | 8.3 |
| 2005 | 32.2°C | 22.8°C | 13.5°C | 42.4°C | 9.1°C | 1 mm | 34% | 4 m/s | 9 |
| 2004 | 34.9°C | 25.9°C | 16.8°C | 43.8°C | 10.4°C | 10 mm | 34% | 4.2 m/s | 8.7 |
| 2003 | 35.2°C | 25.6°C | 16.0°C | 42.1°C | 9.1°C | 11 mm | 35% | 4 m/s | 8.9 |
| 2002 | 34.2°C | 25.5°C | 16.7°C | 43.1°C | 8.8°C | 32 mm | 36% | 4.1 m/s | 8.3 |
| 2001 | 30.9°C | 22.5°C | 14.1°C | 38.1°C | 9.6°C | 6 mm | 41% | 4 m/s | 8.1 |
| 2000 | 36.1°C | 26.8°C | 17.6°C | 42.3°C | 10.8°C | 3 mm | 32% | 3.9 m/s | 8.7 |
| 1999 | 32.5°C | 24.3°C | 16.1°C | 39.4°C | 10.7°C | 28 mm | 39% | 4.1 m/s | 8 |
| 1998 | 33.6°C | 25.2°C | 16.8°C | 41.3°C | 8.6°C | 14 mm | 39% | 4 m/s | 8.1 |
| 1997 | 35.7°C | 26.4°C | 17.1°C | 43.8°C | 11.4°C | 2 mm | 33% | 4.2 m/s | 8.7 |
| 1996 | 32.4°C | 23.4°C | 14.4°C | 40.2°C | 10.4°C | 1 mm | 38% | 4.1 m/s | 8.6 |
| 1995 | 31.2°C | 22.7°C | 14.2°C | 42.4°C | 9.8°C | 70 mm | 44% | 4.2 m/s | 7.9 |
| 1994 | 35.0°C | 26.0°C | 17.0°C | 43.3°C | 10.3°C | 19 mm | 31% | 4 m/s | 8.6 |
| 1993 | 32.4°C | 23.8°C | 15.1°C | 41.4°C | 8.5°C | 4 mm | 37% | 4.4 m/s | 8.9 |
| 1992 | 32.3°C | 23.3°C | 14.2°C | 41.5°C | 8.9°C | 4 mm | 36% | 4 m/s | 8.6 |
| 1991 | 34.0°C | 25.6°C | 17.1°C | 40.0°C | 12.2°C | 22 mm | 36% | 3.9 m/s | 8.2 |
| 1990 | 33.9°C | 24.8°C | 15.7°C | 41.8°C | 9.1°C | 3 mm | 33% | 4 m/s | 9 |
| 1989 | 34.3°C | 25.1°C | 15.9°C | 40.8°C | 10.5°C | 7 mm | 32% | 4.1 m/s | 8.6 |
| 1988 | 31.3°C | 23.1°C | 15.0°C | 41.3°C | 9.9°C | 39 mm | 42% | 4 m/s | 8 |
| 1987 | 34.4°C | 25.6°C | 16.8°C | 41.2°C | 9.5°C | 39 mm | 36% | 3.9 m/s | 8.3 |
| 1986 | 33.2°C | 24.1°C | 15.0°C | 43.0°C | 8.3°C | 21 mm | 34% | 3.9 m/s | 8.7 |
| 1985 ❄️ | 31.1°C | 22.2°C | 13.4°C | 40.5°C | 8.5°C | 4 mm | 34% | 4 m/s | 9.1 |
| 1984 | 32.9°C | 23.9°C | 14.9°C | 41.0°C | 9.4°C | 3 mm | 33% | 4 m/s | 8.6 |
| 1983 | 31.6°C | 23.8°C | 16.1°C | 39.3°C | 9.2°C | 62 mm | 49% | 3.8 m/s | — |
| 1982 | 34.8°C | 26.3°C | 17.7°C | 39.4°C | 10.8°C | 22 mm | 36% | 3.4 m/s | — |
| 1981 | 31.4°C | 22.7°C | 14.1°C | 38.1°C | 10.2°C | 16 mm | 38% | 4.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 33.7°C with lows near 16.1°C (mean 24.9°C), based on 45 years of NASA POWER data.
December averages 17 mm of rainfall in Southern Cross, about average for rainfall. The wettest on record was 76 mm in 2011.
The hottest December reached 44.5°C in 2007. The coldest dipped to 8°C in 2020.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.4°C. Daytime highs moved from 32.4°C to 35.1°C and overnight lows from 15.2°C to 17.2°C over the same span.
December is one of the warmer months of the year in Southern Cross and about average for rainfall, so plan for around 33.7°C daytime highs and 16.1°C at night.
Not quite — December is the 10th coolest month in Southern Cross, averaging 24.9°C.
For December in Southern Cross, pack light, breathable clothing and sun protection, with typical highs of 33.7°C and lows of 16.1°C.
Relative humidity in December averages 36% — relatively dry.
Average wind speed in December is 4 m/s. The windiest December on record averaged 4.5 m/s (2023).
The wettest December on record was 2011 with 76 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 Southern Cross 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.
