December is one of the warmer months of the year in Port Denison, with average highs near 29.6°C and lows around 18.6°C (mean 24.1°C). It is one of the drier months, averaging 7 mm of rainfall and 56% relative humidity across the period.
December is one of the warmer months of the year in Port Denison. Across 45 years of records, the warmest December in Port Denison was 2019 — when the month averaged 26.1°C — while the coldest was 2005 at 20.8°C. Typical December days reach 29.6°C with nights near 18.6°C. The long-term trend is warming, about 0.6°C per decade.
December is one of the drier months in Port Denison, averaging 7 mm of rainfall. The wettest December on record was 1991 with 29 mm, while the driest was 1997 at 0 mm.
Relative humidity in Port Denison during December averages 56%. The most humid December was 1991 at 63%, and the least humid was 2009 at 50%.
December receives about 8.4 kWh/m²/day of solar energy in Port Denison. The sunniest Decembers were 2001 and 2022 at 8.8 kWh/m²/day, and the cloudiest was 2010 at 7.7.
Average wind speed in Port Denison during December is 5.1 m/s. The windiest December was 1996 at 5.8 m/s, while the calmest was 2012 at 4.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.9°C | 24.2°C | 23.8°C | 24.5°C | 25.5°C | +2.6°C |
| Avg High | 28.2°C | 29.6°C | 29.5°C | 30.0°C | 31.3°C | +3.1°C |
| Avg Low | 17.6°C | 18.7°C | 18.2°C | 19.1°C | 19.8°C | +2.2°C |
| Avg Rain | 8 mm | 8 mm | 5 mm | 9 mm | 2 mm | -6 mm |
December temperatures in Port Denison have risen by about 2.8°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 12.4°C (2020) to a record high of 42°C (2021).
Rainfall in December is one of the drier months, averaging 7 mm, with a wettest year of 29 mm.
One of the best times to visit Port Denison
December is one of the best times to visit Port Denison. Expect days averaging 29.6°C and nights around 18.6°C (mean 24.1°C) — warmer than Port Denison's yearly average — with low rainfall (7 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 | 31.6°C | 25.6°C | 19.6°C | 39.8°C | 16.7°C | 4 mm | 52% | 5.5 m/s | — |
| 2024 | 31.6°C | 25.9°C | 20.3°C | 41.6°C | 16.5°C | 3 mm | 54% | 4.9 m/s | 8.4 |
| 2023 | 31.3°C | 25.7°C | 20.1°C | 38.3°C | 17.7°C | 1 mm | 55% | 5 m/s | 8.4 |
| 2022 | 30.3°C | 25.0°C | 19.6°C | 36.4°C | 16.6°C | 1 mm | 51% | 5.1 m/s | 8.8 |
| 2021 | 31.3°C | 25.5°C | 19.7°C | 42.0°C | 15.3°C | 0 mm | 53% | 5.2 m/s | 8.6 |
| 2020 | 31.8°C | 25.6°C | 19.4°C | 39.1°C | 12.4°C | 0 mm | 51% | 5.1 m/s | 8.7 |
| 2019 🔥 | 31.8°C | 26.1°C | 20.5°C | 39.2°C | 16.8°C | 1 mm | 54% | 4.7 m/s | 8.7 |
| 2018 | 29.1°C | 23.6°C | 18.1°C | 38.1°C | 14.2°C | 4 mm | 58% | 5.2 m/s | 8.2 |
| 2017 | 30.1°C | 24.5°C | 19.0°C | 36.3°C | 15.8°C | 14 mm | 56% | 5.3 m/s | 8.3 |
| 2016 | 29.3°C | 23.5°C | 17.8°C | 36.3°C | 14.8°C | 2 mm | 55% | 5.7 m/s | 8.7 |
| 2015 | 29.7°C | 24.0°C | 18.3°C | 39.8°C | 14.4°C | 13 mm | 54% | 5.4 m/s | 8.2 |
| 2014 | 29.1°C | 23.6°C | 18.0°C | 36.0°C | 15.2°C | 1 mm | 56% | 5.4 m/s | 8.5 |
| 2013 | 30.8°C | 25.1°C | 19.4°C | 37.0°C | 15.1°C | 3 mm | 52% | 5 m/s | 8.6 |
| 2012 | 30.5°C | 25.0°C | 19.5°C | 38.7°C | 13.0°C | 22 mm | 57% | 4.6 m/s | 8.2 |
| 2011 | 29.8°C | 25.0°C | 20.2°C | 35.5°C | 17.4°C | 12 mm | 58% | 4.8 m/s | 8 |
| 2010 | 29.9°C | 24.8°C | 19.7°C | 40.9°C | 15.8°C | 19 mm | 57% | 5.3 m/s | 7.7 |
| 2009 | 31.4°C | 25.3°C | 19.3°C | 39.2°C | 15.2°C | 2 mm | 50% | 5.2 m/s | 8.5 |
| 2008 | 28.1°C | 22.8°C | 17.4°C | 36.7°C | 15.2°C | 5 mm | 61% | 5.3 m/s | 8.7 |
| 2007 | 28.8°C | 23.5°C | 18.3°C | 39.9°C | 13.2°C | 24 mm | 57% | 5.3 m/s | 8 |
| 2006 | 31.0°C | 25.1°C | 19.1°C | 36.1°C | 13.8°C | 11 mm | 52% | 5 m/s | 8.6 |
| 2005 ❄️ | 25.5°C | 20.8°C | 16.1°C | 33.7°C | 13.6°C | 1 mm | 63% | 5.1 m/s | 8.4 |
| 2004 | 30.2°C | 24.3°C | 18.5°C | 39.4°C | 13.6°C | 2 mm | 57% | 4.7 m/s | 8.5 |
| 2003 | 29.7°C | 23.7°C | 17.7°C | 39.4°C | 13.5°C | 1 mm | 58% | 5.6 m/s | 8.5 |
| 2002 | 30.1°C | 24.4°C | 18.7°C | 38.1°C | 13.0°C | 4 mm | 57% | 4.7 m/s | 8.3 |
| 2001 | 28.1°C | 23.0°C | 18.0°C | 32.1°C | 15.9°C | 2 mm | 56% | 5.4 m/s | 8.8 |
| 2000 | 31.8°C | 25.5°C | 19.2°C | 39.2°C | 14.2°C | 2 mm | 52% | 5.6 m/s | 8.7 |
| 1999 | 31.1°C | 25.8°C | 20.4°C | 38.3°C | 15.3°C | 18 mm | 54% | 4.9 m/s | 8.6 |
| 1998 | 30.0°C | 24.6°C | 19.2°C | 37.1°C | 14.0°C | 15 mm | 57% | 5.1 m/s | 8.4 |
| 1997 | 30.5°C | 24.6°C | 18.8°C | 40.5°C | 15.7°C | 0 mm | 56% | 5.4 m/s | 8.5 |
| 1996 | 29.5°C | 24.1°C | 18.7°C | 39.6°C | 14.0°C | 3 mm | 54% | 5.8 m/s | 8.5 |
| 1995 | 28.8°C | 23.8°C | 18.7°C | 35.6°C | 15.9°C | 7 mm | 56% | 5.3 m/s | 8.4 |
| 1994 | 31.0°C | 25.3°C | 19.5°C | 37.3°C | 15.8°C | 0 mm | 52% | 5 m/s | 8.5 |
| 1993 | 30.0°C | 24.1°C | 18.2°C | 37.9°C | 15.0°C | 1 mm | 52% | 5.5 m/s | 8.4 |
| 1992 | 29.0°C | 23.3°C | 17.6°C | 36.2°C | 15.1°C | 3 mm | 56% | 5.3 m/s | 8.4 |
| 1991 🌧️ | 27.9°C | 22.6°C | 17.4°C | 37.4°C | 14.6°C | 29 mm | 63% | 4.8 m/s | 8.1 |
| 1990 | 28.4°C | 23.3°C | 18.2°C | 37.3°C | 15.2°C | 3 mm | 60% | 5.2 m/s | 8.4 |
| 1989 | 27.9°C | 22.6°C | 17.4°C | 37.1°C | 14.9°C | 3 mm | 60% | 5.1 m/s | 8.4 |
| 1988 | 29.7°C | 24.4°C | 19.0°C | 35.2°C | 15.3°C | 20 mm | 56% | 5.1 m/s | 8.7 |
| 1987 | 28.2°C | 22.9°C | 17.7°C | 37.9°C | 13.7°C | 1 mm | 61% | 4.8 m/s | 8 |
| 1986 | 28.1°C | 22.6°C | 17.2°C | 34.8°C | 14.1°C | 2 mm | 59% | 4.9 m/s | 8.3 |
| 1985 | 26.6°C | 21.4°C | 16.2°C | 35.0°C | 13.7°C | 9 mm | 58% | 5 m/s | 8.4 |
| 1984 | 27.2°C | 21.9°C | 16.6°C | 34.5°C | 13.9°C | 9 mm | 60% | 5.3 m/s | 8 |
| 1983 | 29.2°C | 23.9°C | 18.5°C | 36.3°C | 14.1°C | 18 mm | 61% | 4.7 m/s | — |
| 1982 | 27.9°C | 23.0°C | 18.1°C | 35.4°C | 15.9°C | 3 mm | 63% | 4.7 m/s | — |
| 1981 | 28.7°C | 23.2°C | 17.7°C | 36.1°C | 14.3°C | 5 mm | 55% | 5.3 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 18.6°C (mean 24.1°C), based on 45 years of NASA POWER data.
December averages 7 mm of rainfall in Port Denison, one of the drier months. The wettest on record was 29 mm in 1991.
The hottest December reached 42°C in 2021. The coldest dipped to 12.4°C in 2020.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.8°C. Daytime highs moved from 27.9°C to 31.2°C and overnight lows from 17.4°C to 19.9°C over the same span.
December is one of the warmer months of the year in Port Denison and one of the drier months, so plan for around 29.6°C daytime highs and 18.6°C at night.
Not quite — December is the 9th coolest month in Port Denison, averaging 24.1°C.
For December in Port Denison, pack light layers you can adjust through the day, with typical highs of 29.6°C and lows of 18.6°C.
Relative humidity in December averages 56% — moderately humid.
Average wind speed in December is 5.1 m/s. The windiest December on record averaged 5.8 m/s (1996).
The wettest December on record was 1991 with 29 mm. On average, December sees 7 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 Denison 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.
