December is one of the warmer months of the year in Port Lincoln, with average highs near 24°C and lows around 15.2°C (mean 19.6°C). It is one of the drier months, averaging 21 mm of rainfall and 62% relative humidity across the period.
December is one of the warmer months of the year in Port Lincoln. Across 45 years of records, the warmest December in Port Lincoln was 2015 — when the month averaged 22.2°C — while the coldest was 2001 at 16.9°C. Typical December days reach 24°C with nights near 15.2°C. The long-term trend is warming, about 0.3°C per decade.
December is one of the drier months in Port Lincoln, averaging 21 mm of rainfall. The wettest December on record was 1992 with 110 mm, while the driest was 2017 at 2 mm.
Relative humidity in Port Lincoln during December averages 62%. The most humid December was 1992 at 77%, and the least humid was 2015 at 53%.
December receives about 7.4 kWh/m²/day of solar energy in Port Lincoln. The sunniest Decembers were 2015 and 2021 at 8.2 kWh/m²/day, and the cloudiest was 1992 at 5.9.
Average wind speed in Port Lincoln during December is 5.5 m/s. The windiest Decembers were 1999 and 2002 at 6.2 m/s, while the calmest was 2015 at 4.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.3°C | 19.0°C | 19.6°C | 20.4°C | 19.6°C | +0.3°C |
| Avg High | 23.7°C | 23.2°C | 23.9°C | 25.0°C | 23.9°C | +0.2°C |
| Avg Low | 14.8°C | 14.8°C | 15.2°C | 15.8°C | 15.3°C | +0.5°C |
| Avg Rain | 18 mm | 32 mm | 21 mm | 17 mm | 14 mm | -4 mm |
December temperatures in Port Lincoln have risen by about 0.4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 10.5°C (1987) to a record high of 41.3°C (2019).
Rainfall in December is one of the drier months, averaging 21 mm, with a wettest year of 110 mm.
One of the best times to visit Port Lincoln
December is one of the best times to visit Port Lincoln. Expect days averaging 24°C and nights around 15.2°C (mean 19.6°C) — warmer than Port Lincoln's yearly average — with low rainfall (21 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 | 24.8°C | 20.1°C | 15.4°C | 35.0°C | 11.9°C | 24 mm | 57% | 5.8 m/s | — |
| 2024 | 25.6°C | 21.1°C | 16.6°C | 36.3°C | 14.5°C | 6 mm | 60% | 5.1 m/s | 8 |
| 2023 | 22.5°C | 18.8°C | 15.1°C | 30.3°C | 13.1°C | 11 mm | 64% | 5.9 m/s | 6.9 |
| 2022 | 23.8°C | 19.4°C | 15.1°C | 36.2°C | 11.5°C | 28 mm | 62% | 5.5 m/s | 7.6 |
| 2021 | 23.8°C | 19.3°C | 14.9°C | 33.8°C | 12.3°C | 2 mm | 61% | 5.6 m/s | 8.2 |
| 2020 | 23.0°C | 18.8°C | 14.6°C | 33.1°C | 12.3°C | 16 mm | 61% | 6 m/s | 7.7 |
| 2019 | 27.3°C | 21.9°C | 16.5°C | 41.3°C | 12.8°C | 3 mm | 56% | 5.4 m/s | 7.9 |
| 2018 | 26.0°C | 21.1°C | 16.2°C | 37.0°C | 13.0°C | 2 mm | 59% | 5.8 m/s | 7.2 |
| 2017 | 24.7°C | 20.3°C | 16.0°C | 35.7°C | 13.5°C | 2 mm | 59% | 5.1 m/s | 7.3 |
| 2016 | 25.1°C | 20.4°C | 15.6°C | 35.1°C | 12.6°C | 5 mm | 58% | 5.3 m/s | 7.6 |
| 2015 🔥 | 27.5°C | 22.2°C | 16.9°C | 36.4°C | 11.6°C | 39 mm | 53% | 4.8 m/s | 8.2 |
| 2014 | 23.0°C | 19.2°C | 15.4°C | 29.9°C | 13.0°C | 18 mm | 64% | 5.4 m/s | 7.4 |
| 2013 | 24.3°C | 19.7°C | 15.2°C | 35.9°C | 11.8°C | 19 mm | 60% | 5.3 m/s | 7.5 |
| 2012 | 24.6°C | 19.9°C | 15.3°C | 34.7°C | 12.8°C | 5 mm | 59% | 5.2 m/s | 7.7 |
| 2011 | 24.7°C | 20.3°C | 15.9°C | 35.2°C | 13.1°C | 34 mm | 63% | 5.5 m/s | 7.3 |
| 2010 | 23.2°C | 19.2°C | 15.1°C | 36.6°C | 13.2°C | 39 mm | 65% | 5.6 m/s | 7.1 |
| 2009 | 25.1°C | 20.4°C | 15.6°C | 37.2°C | 12.8°C | 14 mm | 57% | 5 m/s | 8 |
| 2008 | 22.6°C | 18.8°C | 15.0°C | 31.0°C | 12.3°C | 35 mm | 67% | 5.3 m/s | 6.8 |
| 2007 | 24.9°C | 20.2°C | 15.5°C | 36.3°C | 12.5°C | 35 mm | 60% | 5.3 m/s | 7.4 |
| 2006 | 24.2°C | 19.5°C | 14.8°C | 37.8°C | 12.6°C | 21 mm | 58% | 5.8 m/s | 7.5 |
| 2005 | 24.3°C | 19.6°C | 14.9°C | 36.2°C | 12.3°C | 26 mm | 63% | 6.1 m/s | 7.6 |
| 2004 | 24.0°C | 19.7°C | 15.4°C | 36.1°C | 12.9°C | 15 mm | 63% | 5.7 m/s | 7.3 |
| 2003 | 24.6°C | 20.2°C | 15.8°C | 34.8°C | 12.8°C | 12 mm | 63% | 5.6 m/s | 7.7 |
| 2002 | 24.1°C | 19.5°C | 14.9°C | 34.3°C | 11.8°C | 16 mm | 61% | 6.2 m/s | 7.5 |
| 2001 ❄️ | 20.1°C | 16.9°C | 13.6°C | 30.1°C | 11.9°C | 28 mm | 68% | 5.3 m/s | 6.9 |
| 2000 | 25.4°C | 20.9°C | 16.4°C | 37.5°C | 12.7°C | 3 mm | 59% | 5.6 m/s | 7.6 |
| 1999 | 23.6°C | 19.5°C | 15.3°C | 33.4°C | 12.6°C | 18 mm | 63% | 6.2 m/s | 7.2 |
| 1998 | 24.5°C | 20.1°C | 15.7°C | 37.9°C | 12.7°C | 18 mm | 60% | 5.3 m/s | 7.5 |
| 1997 | 23.2°C | 19.0°C | 14.9°C | 30.7°C | 12.9°C | 41 mm | 68% | 5.4 m/s | 7.7 |
| 1996 | 23.0°C | 18.7°C | 14.5°C | 33.7°C | 11.6°C | 12 mm | 61% | 5.3 m/s | 7.6 |
| 1995 | 22.1°C | 18.0°C | 14.0°C | 32.7°C | 10.9°C | 9 mm | 64% | 5.8 m/s | 6.9 |
| 1994 | 26.1°C | 20.9°C | 15.7°C | 37.3°C | 11.2°C | 13 mm | 55% | 5.1 m/s | 7.7 |
| 1993 | 22.9°C | 18.8°C | 14.6°C | 31.7°C | 11.4°C | 21 mm | 63% | 5.6 m/s | 7.2 |
| 1992 🌧️ | 21.0°C | 17.7°C | 14.5°C | 31.2°C | 13.0°C | 110 mm | 77% | 5.6 m/s | 5.9 |
| 1991 | 22.4°C | 18.3°C | 14.3°C | 32.2°C | 12.1°C | 2 mm | 64% | 5.7 m/s | 7.3 |
| 1990 | 22.9°C | 18.7°C | 14.5°C | 33.3°C | 11.6°C | 78 mm | 67% | 5.4 m/s | 6.9 |
| 1989 | 24.9°C | 20.3°C | 15.6°C | 35.8°C | 13.0°C | 11 mm | 58% | 5.4 m/s | 7.6 |
| 1988 | 23.5°C | 19.3°C | 15.1°C | 35.5°C | 12.0°C | 25 mm | 64% | 5.5 m/s | 7.3 |
| 1987 | 23.9°C | 19.3°C | 14.7°C | 34.6°C | 10.5°C | 16 mm | 60% | 5.7 m/s | 7.3 |
| 1986 | 22.1°C | 17.7°C | 13.4°C | 33.8°C | 10.8°C | 29 mm | 62% | 6 m/s | 6.9 |
| 1985 | 21.7°C | 17.9°C | 14.1°C | 34.1°C | 12.0°C | 27 mm | 64% | 5.7 m/s | 7 |
| 1984 | 24.1°C | 19.6°C | 15.1°C | 35.7°C | 11.3°C | 16 mm | 60% | 5.6 m/s | 7.1 |
| 1983 | 24.7°C | 20.0°C | 15.3°C | 34.5°C | 11.8°C | 28 mm | 60% | 4.9 m/s | — |
| 1982 | 25.0°C | 20.1°C | 15.2°C | 33.1°C | 11.0°C | 7 mm | 58% | 5.1 m/s | — |
| 1981 | 23.6°C | 19.1°C | 14.7°C | 37.1°C | 12.0°C | 5 mm | 60% | 5.4 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 24°C with lows near 15.2°C (mean 19.6°C), based on 45 years of NASA POWER data.
December averages 21 mm of rainfall in Port Lincoln, one of the drier months. The wettest on record was 110 mm in 1992.
The hottest December reached 41.3°C in 2019. The coldest dipped to 10.5°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.4°C. Daytime highs moved from 23.8°C to 24.1°C and overnight lows from 14.9°C to 15.4°C over the same span.
December is one of the warmer months of the year in Port Lincoln and one of the drier months, so plan for around 24°C daytime highs and 15.2°C at night.
Not quite — December is the 9th coolest month in Port Lincoln, averaging 19.6°C.
For December in Port Lincoln, pack light layers you can adjust through the day, with typical highs of 24°C and lows of 15.2°C.
Relative humidity in December averages 62% — moderately humid.
Average wind speed in December is 5.5 m/s. The windiest December on record averaged 6.2 m/s (1999).
The wettest December on record was 1992 with 110 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 Port Lincoln 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.
