December is one of the warmer months of the year in Cessnock, with average highs near 29.2°C and lows around 16.2°C (mean 22.7°C). It is about average for rainfall, averaging 80 mm of rainfall and 64% relative humidity across the period.
December is one of the warmer months of the year in Cessnock. Across 45 years of records, the warmest December in Cessnock was 1990 — when the month averaged 26.1°C — while the coldest was 2011 at 18.6°C. Typical December days reach 29.2°C with nights near 16.2°C. The long-term trend is warming, about 0.2°C per decade.
December is about average for rainfall in Cessnock, averaging 80 mm of rainfall. The wettest December on record was 1992 with 185 mm, while the driest was 2019 at 2 mm.
Relative humidity in Cessnock during December averages 64%. The most humid December was 1992 at 78%, and the least humid was 2019 at 50%.
December receives about 6.7 kWh/m²/day of solar energy in Cessnock. The sunniest December was 2005 at 8 kWh/m²/day, and the cloudiest was 2011 at 5.5.
Average wind speed in Cessnock during December is 0.6 m/s. The windiest Decembers were 2019, 2020 and 2022, among others at 0.7 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.4°C | 22.4°C | 22.9°C | 23.1°C | 22.9°C | +0.5°C |
| Avg High | 29.0°C | 28.8°C | 29.5°C | 29.6°C | 29.3°C | +0.3°C |
| Avg Low | 15.7°C | 16.0°C | 16.4°C | 16.6°C | 16.5°C | +0.8°C |
| Avg Rain | 78 mm | 88 mm | 76 mm | 77 mm | 78 mm | +0 mm |
December temperatures in Cessnock have risen by about 0.5°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 7.8°C (1995) to a record high of 42.1°C (2019).
Rainfall in December is about average for rainfall, averaging 80 mm, with a wettest year of 185 mm.
One of the best times to visit Cessnock
December is one of the best times to visit Cessnock. Expect days averaging 29.2°C and nights around 16.2°C (mean 22.7°C) — warmer than Cessnock's yearly average — with moderate rainfall (80 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 | 31.2°C | 23.9°C | 16.6°C | 41.5°C | 11.0°C | 53 mm | 56% | 0.6 m/s | — |
| 2024 | 32.4°C | 25.2°C | 18.1°C | 40.4°C | 13.3°C | 43 mm | 61% | 0.6 m/s | 7.3 |
| 2023 | 31.5°C | 24.8°C | 18.1°C | 41.5°C | 14.6°C | 78 mm | 65% | 0.6 m/s | 6.9 |
| 2022 | 26.9°C | 20.4°C | 14.0°C | 33.3°C | 10.9°C | 42 mm | 62% | 0.7 m/s | 7 |
| 2021 | 26.2°C | 21.0°C | 15.7°C | 35.4°C | 11.0°C | 88 mm | 77% | 0.6 m/s | 6.7 |
| 2020 | 27.7°C | 22.2°C | 16.8°C | 39.6°C | 13.7°C | 164 mm | 70% | 0.7 m/s | 5.6 |
| 2019 | 32.3°C | 24.6°C | 16.8°C | 42.1°C | 12.2°C | 2 mm | 50% | 0.7 m/s | 7.4 |
| 2018 | 30.6°C | 23.8°C | 16.9°C | 38.7°C | 13.4°C | 94 mm | 66% | 0.6 m/s | 7.4 |
| 2017 | 31.5°C | 24.8°C | 18.1°C | 41.3°C | 14.3°C | 69 mm | 63% | 0.6 m/s | 6.5 |
| 2016 | 32.1°C | 25.1°C | 18.1°C | 39.5°C | 14.4°C | 72 mm | 60% | 0.6 m/s | 6.9 |
| 2015 | 29.0°C | 22.6°C | 16.1°C | 38.2°C | 11.3°C | 122 mm | 63% | 0.6 m/s | 6.7 |
| 2014 | 29.1°C | 23.1°C | 17.2°C | 36.6°C | 13.7°C | 143 mm | 67% | 0.6 m/s | 6.4 |
| 2013 | 30.0°C | 22.9°C | 15.9°C | 39.7°C | 10.2°C | 25 mm | 59% | 0.6 m/s | 7.4 |
| 2012 | 30.5°C | 23.3°C | 16.2°C | 39.9°C | 10.9°C | 64 mm | 62% | 0.7 m/s | 6.2 |
| 2011 ❄️ | 23.4°C | 18.6°C | 13.7°C | 31.6°C | 9.4°C | 88 mm | 75% | 0.6 m/s | 5.5 |
| 2010 | 27.3°C | 21.9°C | 16.5°C | 34.1°C | 11.0°C | 95 mm | 70% | 0.6 m/s | 6.1 |
| 2009 | 30.4°C | 23.8°C | 17.2°C | 40.1°C | 12.1°C | 80 mm | 63% | 0.6 m/s | 6.1 |
| 2008 | 28.8°C | 22.4°C | 16.1°C | 34.0°C | 12.5°C | 89 mm | 62% | 0.6 m/s | 6.6 |
| 2007 | 25.8°C | 20.9°C | 16.0°C | 30.7°C | 12.7°C | 131 mm | 77% | 0.6 m/s | 6 |
| 2006 | 28.7°C | 22.0°C | 15.4°C | 39.3°C | 8.8°C | 66 mm | 63% | 0.6 m/s | 6.6 |
| 2005 | 32.9°C | 25.0°C | 17.1°C | 40.9°C | 11.7°C | 30 mm | 54% | 0.6 m/s | 8 |
| 2004 | 28.2°C | 22.0°C | 15.9°C | 40.8°C | 10.3°C | 101 mm | 67% | 0.6 m/s | 6.7 |
| 2003 | 30.0°C | 23.5°C | 17.0°C | 39.8°C | 14.0°C | 60 mm | 65% | 0.6 m/s | 6.4 |
| 2002 | 28.9°C | 22.4°C | 15.9°C | 39.9°C | 10.6°C | 100 mm | 62% | 0.7 m/s | 6.8 |
| 2001 | 30.6°C | 23.5°C | 16.4°C | 38.6°C | 12.8°C | 45 mm | 58% | 0.6 m/s | 6.6 |
| 2000 | 30.3°C | 23.6°C | 17.0°C | 38.2°C | 10.9°C | 60 mm | 61% | 0.6 m/s | 7.1 |
| 1999 | 26.6°C | 20.8°C | 15.1°C | 34.6°C | 11.7°C | 72 mm | 67% | 0.6 m/s | 6.5 |
| 1998 | 29.6°C | 23.2°C | 16.9°C | 36.2°C | 11.5°C | 48 mm | 65% | 0.6 m/s | 7 |
| 1997 | 32.7°C | 25.5°C | 18.4°C | 41.0°C | 15.7°C | 47 mm | 56% | 0.7 m/s | 6.8 |
| 1996 | 28.7°C | 22.0°C | 15.2°C | 37.1°C | 11.4°C | 78 mm | 62% | 0.6 m/s | 6.7 |
| 1995 | 26.1°C | 20.2°C | 14.3°C | 32.5°C | 7.8°C | 104 mm | 68% | 0.6 m/s | 6.5 |
| 1994 | 29.5°C | 22.7°C | 15.9°C | 40.9°C | 10.2°C | 73 mm | 63% | 0.7 m/s | 6.8 |
| 1993 | 29.0°C | 22.3°C | 15.7°C | 38.7°C | 12.5°C | 45 mm | 61% | 0.7 m/s | 6.5 |
| 1992 🌧️ | 25.0°C | 20.3°C | 15.5°C | 30.8°C | 11.2°C | 185 mm | 78% | 0.6 m/s | 6.1 |
| 1991 | 26.4°C | 20.5°C | 14.7°C | 33.6°C | 11.6°C | 181 mm | 69% | 0.6 m/s | 6.4 |
| 1990 🔥 | 34.2°C | 26.1°C | 18.0°C | 42.0°C | 12.2°C | 47 mm | 55% | 0.6 m/s | 7.4 |
| 1989 | 28.1°C | 21.7°C | 15.4°C | 35.4°C | 11.8°C | 96 mm | 65% | 0.7 m/s | 6.9 |
| 1988 | 28.2°C | 22.5°C | 16.8°C | 35.5°C | 11.9°C | 119 mm | 71% | 0.7 m/s | 6 |
| 1987 | 28.6°C | 22.1°C | 15.6°C | 38.8°C | 9.7°C | 100 mm | 63% | 0.7 m/s | 6.4 |
| 1986 | 28.8°C | 21.7°C | 14.6°C | 36.1°C | 10.1°C | 24 mm | 57% | 0.6 m/s | 7.8 |
| 1985 | 29.3°C | 22.8°C | 16.3°C | 37.7°C | 11.8°C | 65 mm | 60% | 0.6 m/s | 6.9 |
| 1984 | 29.1°C | 21.9°C | 14.8°C | 38.2°C | 9.9°C | 67 mm | 57% | 0.6 m/s | 7.2 |
| 1983 | 27.8°C | 21.5°C | 15.2°C | 39.3°C | 11.2°C | 119 mm | 67% | 0.6 m/s | — |
| 1982 | 31.2°C | 23.9°C | 16.5°C | 40.2°C | 13.3°C | 34 mm | 56% | 0.7 m/s | — |
| 1981 | 30.0°C | 23.1°C | 16.2°C | 39.2°C | 12.5°C | 78 mm | 61% | 0.6 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 29.2°C with lows near 16.2°C (mean 22.7°C), based on 45 years of NASA POWER data.
December averages 80 mm of rainfall in Cessnock, about average for rainfall. The wettest on record was 185 mm in 1992.
The hottest December reached 42.1°C in 2019. The coldest dipped to 7.8°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.5°C. Daytime highs moved from 29.5°C to 29.6°C and overnight lows from 15.8°C to 16.5°C over the same span.
December is one of the warmer months of the year in Cessnock and about average for rainfall, so plan for around 29.2°C daytime highs and 16.2°C at night.
Not quite — December is the 10th coolest month in Cessnock, averaging 22.7°C.
For December in Cessnock, pack light layers you can adjust through the day, with typical highs of 29.2°C and lows of 16.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 64% — moderately humid.
Average wind speed in December is 0.6 m/s. The windiest December on record averaged 0.7 m/s (1982).
The wettest December on record was 1992 with 185 mm. On average, December sees 80 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 Cessnock 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.
