December is one of the warmer months of the year in Victor Harbor, with average highs near 22.9°C and lows around 14.8°C (mean 18.9°C). It is one of the drier months, averaging 22 mm of rainfall and 63% relative humidity across the period.
December is one of the warmer months of the year in Victor Harbor. Across 45 years of records, the warmest December in Victor Harbor was 2015 — when the month averaged 21.7°C — while the coldest was 2001 at 16.3°C. Typical December days reach 22.9°C with nights near 14.8°C. The long-term trend is warming, about 0.3°C per decade.
December is one of the drier months in Victor Harbor, averaging 22 mm of rainfall. The wettest December on record was 1992 with 100 mm, while the driest was 2017 at 0 mm.
Relative humidity in Victor Harbor during December averages 63%. The most humid December was 1992 at 76%, and the least humid was 2015 at 54%.
December receives about 7.3 kWh/m²/day of solar energy in Victor Harbor. The sunniest December was 2021 at 8.2 kWh/m²/day, and the cloudiest was 1992 at 6.
Average wind speed in Victor Harbor during December is 5.4 m/s. The windiest Decembers were 2002, 2005 and 2020 at 6 m/s, while the calmest was 1983 at 4.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.6°C | 18.3°C | 18.7°C | 19.7°C | 18.9°C | +0.3°C |
| Avg High | 22.7°C | 22.2°C | 22.7°C | 23.9°C | 22.8°C | +0.1°C |
| Avg Low | 14.5°C | 14.4°C | 14.8°C | 15.6°C | 14.9°C | +0.4°C |
| Avg Rain | 21 mm | 31 mm | 23 mm | 18 mm | 16 mm | -5 mm |
December temperatures in Victor Harbor have risen by about 0.3°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 10°C (1994) to a record high of 38.4°C (2019).
Rainfall in December is one of the drier months, averaging 22 mm, with a wettest year of 100 mm.
One of the best times to visit Victor Harbor
December is one of the best times to visit Victor Harbor. Expect days averaging 22.9°C and nights around 14.8°C (mean 18.9°C) — warmer than Victor Harbor's yearly average — with low rainfall (22 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 | 23.5°C | 19.2°C | 14.9°C | 34.4°C | 11.6°C | 21 mm | 58% | 5.4 m/s | — |
| 2024 | 24.6°C | 20.5°C | 16.4°C | 32.6°C | 14.1°C | 10 mm | 61% | 5.1 m/s | 7.9 |
| 2023 | 21.9°C | 18.4°C | 14.8°C | 30.7°C | 12.5°C | 16 mm | 69% | 5.9 m/s | 6.2 |
| 2022 | 22.7°C | 18.6°C | 14.6°C | 34.8°C | 11.9°C | 37 mm | 64% | 5.2 m/s | 7.7 |
| 2021 | 22.5°C | 18.5°C | 14.6°C | 33.1°C | 12.0°C | 2 mm | 64% | 5.3 m/s | 8.2 |
| 2020 | 21.8°C | 18.1°C | 14.3°C | 30.3°C | 11.9°C | 13 mm | 62% | 6 m/s | 7.5 |
| 2019 | 25.5°C | 20.7°C | 15.9°C | 38.4°C | 12.2°C | 1 mm | 58% | 5.3 m/s | 8 |
| 2018 | 25.0°C | 20.6°C | 16.2°C | 35.4°C | 13.3°C | 0 mm | 62% | 5.6 m/s | 7.1 |
| 2017 | 23.5°C | 19.7°C | 15.9°C | 33.3°C | 13.6°C | 0 mm | 62% | 5 m/s | 7.1 |
| 2016 | 23.9°C | 19.5°C | 15.1°C | 34.7°C | 12.0°C | 2 mm | 61% | 5.2 m/s | 7.4 |
| 2015 🔥 | 26.5°C | 21.7°C | 16.8°C | 36.4°C | 11.6°C | 36 mm | 54% | 4.8 m/s | 7.9 |
| 2014 | 22.3°C | 18.8°C | 15.3°C | 29.4°C | 13.0°C | 16 mm | 66% | 5.2 m/s | 7.1 |
| 2013 | 23.3°C | 19.1°C | 14.9°C | 35.3°C | 11.3°C | 22 mm | 62% | 5.1 m/s | 7.3 |
| 2012 | 23.2°C | 19.2°C | 15.3°C | 35.2°C | 12.4°C | 10 mm | 61% | 5.1 m/s | 7.5 |
| 2011 | 23.1°C | 19.2°C | 15.3°C | 32.6°C | 11.8°C | 26 mm | 65% | 5.2 m/s | 7.3 |
| 2010 | 22.2°C | 18.6°C | 14.9°C | 29.8°C | 11.6°C | 63 mm | 67% | 5.3 m/s | 6.9 |
| 2009 | 23.5°C | 19.3°C | 15.2°C | 35.6°C | 12.3°C | 29 mm | 63% | 4.9 m/s | 7.6 |
| 2008 | 21.2°C | 17.8°C | 14.5°C | 28.1°C | 12.0°C | 45 mm | 68% | 5.4 m/s | 6.6 |
| 2007 | 23.7°C | 19.4°C | 15.1°C | 34.9°C | 11.5°C | 33 mm | 62% | 5 m/s | 7.2 |
| 2006 | 23.0°C | 18.7°C | 14.3°C | 35.3°C | 10.5°C | 14 mm | 58% | 5.7 m/s | 7.6 |
| 2005 | 23.2°C | 19.1°C | 15.0°C | 33.7°C | 13.1°C | 31 mm | 63% | 6 m/s | 7.2 |
| 2004 | 22.9°C | 19.0°C | 15.2°C | 33.4°C | 11.9°C | 19 mm | 66% | 5.2 m/s | 7.4 |
| 2003 | 23.6°C | 19.5°C | 15.3°C | 34.2°C | 11.6°C | 20 mm | 65% | 5.3 m/s | 7.5 |
| 2002 | 22.9°C | 18.7°C | 14.4°C | 34.4°C | 11.0°C | 11 mm | 63% | 6 m/s | 7.3 |
| 2001 ❄️ | 19.3°C | 16.3°C | 13.3°C | 27.6°C | 10.9°C | 25 mm | 70% | 5.4 m/s | 7 |
| 2000 | 23.8°C | 19.6°C | 15.5°C | 34.2°C | 12.3°C | 8 mm | 61% | 5.3 m/s | 7.8 |
| 1999 | 22.3°C | 18.5°C | 14.7°C | 31.7°C | 12.4°C | 32 mm | 66% | 5.9 m/s | 7 |
| 1998 | 23.1°C | 19.1°C | 15.0°C | 34.9°C | 12.8°C | 11 mm | 64% | 5.1 m/s | 7 |
| 1997 | 22.1°C | 18.4°C | 14.7°C | 29.3°C | 12.6°C | 23 mm | 69% | 5.2 m/s | 7.4 |
| 1996 | 21.9°C | 17.8°C | 13.7°C | 32.7°C | 11.7°C | 15 mm | 62% | 5.3 m/s | 7.6 |
| 1995 | 21.0°C | 17.2°C | 13.4°C | 30.3°C | 10.5°C | 20 mm | 66% | 5.7 m/s | 7.2 |
| 1994 | 24.6°C | 19.8°C | 15.0°C | 35.4°C | 10.0°C | 11 mm | 58% | 5 m/s | 7.9 |
| 1993 | 21.6°C | 17.8°C | 14.1°C | 32.7°C | 10.7°C | 46 mm | 67% | 5.6 m/s | 7.2 |
| 1992 🌧️ | 21.6°C | 18.3°C | 14.9°C | 29.9°C | 11.5°C | 100 mm | 76% | 5.1 m/s | 6 |
| 1991 | 21.1°C | 17.5°C | 13.8°C | 28.6°C | 11.6°C | 8 mm | 67% | 5.5 m/s | 7.3 |
| 1990 | 22.6°C | 18.7°C | 14.8°C | 32.8°C | 11.4°C | 43 mm | 65% | 5.2 m/s | 6.8 |
| 1989 | 23.9°C | 19.6°C | 15.2°C | 35.0°C | 11.5°C | 6 mm | 60% | 5.3 m/s | 7.5 |
| 1988 | 22.5°C | 18.8°C | 15.0°C | 33.6°C | 11.3°C | 28 mm | 66% | 5.2 m/s | 7.2 |
| 1987 | 22.8°C | 18.4°C | 14.1°C | 32.8°C | 10.5°C | 34 mm | 63% | 5.5 m/s | 7.4 |
| 1986 | 21.0°C | 17.1°C | 13.2°C | 32.9°C | 10.6°C | 36 mm | 65% | 5.8 m/s | 6.7 |
| 1985 | 21.4°C | 17.7°C | 14.0°C | 31.2°C | 12.6°C | 34 mm | 65% | 5.8 m/s | 6.8 |
| 1984 | 23.3°C | 19.1°C | 14.9°C | 32.9°C | 12.3°C | 6 mm | 60% | 5.8 m/s | 7.1 |
| 1983 | 23.8°C | 19.3°C | 14.8°C | 33.4°C | 11.9°C | 29 mm | 62% | 4.7 m/s | — |
| 1982 | 23.2°C | 19.0°C | 14.9°C | 30.4°C | 11.6°C | 10 mm | 60% | 5.1 m/s | — |
| 1981 | 22.6°C | 18.5°C | 14.4°C | 35.3°C | 11.5°C | 9 mm | 62% | 5.3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 22.9°C with lows near 14.8°C (mean 18.9°C), based on 45 years of NASA POWER data.
December averages 22 mm of rainfall in Victor Harbor, one of the drier months. The wettest on record was 100 mm in 1992.
The hottest December reached 38.4°C in 2019. The coldest dipped to 10°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.3°C. Daytime highs moved from 22.9°C to 23°C and overnight lows from 14.6°C to 15.1°C over the same span.
December is one of the warmer months of the year in Victor Harbor and one of the drier months, so plan for around 22.9°C daytime highs and 14.8°C at night.
Not quite — December is the 9th coolest month in Victor Harbor, averaging 18.9°C.
For December in Victor Harbor, pack light layers you can adjust through the day, with typical highs of 22.9°C and lows of 14.8°C.
Relative humidity in December averages 63% — moderately humid.
Average wind speed in December is 5.4 m/s. The windiest December on record averaged 6 m/s (2002).
The wettest December on record was 1992 with 100 mm. On average, December sees 22 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 Victor Harbor 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.
