December is one of the warmer months of the year in Grafton, with average highs near 28.1°C and lows around 20°C (mean 24.1°C). It is a relatively wet time of year, averaging 128 mm of rainfall and 70% relative humidity across the period.
December is one of the warmer months of the year in Grafton. Across 45 years of records, the warmest December in Grafton was 1990 — when the month averaged 27°C — while the coldest was 2011 at 21.4°C. Typical December days reach 28.1°C with nights near 20°C. The long-term trend is warming, about 0.2°C per decade.
December is a relatively wet time of year in Grafton, averaging 128 mm of rainfall. The wettest December on record was 2020 with 400 mm, while the driest was 2013 at 39 mm.
Relative humidity in Grafton during December averages 70%. The most humid December was 2010 at 80%, and the least humid was 1990 at 61%.
December receives about 6.6 kWh/m²/day of solar energy in Grafton. The sunniest December was 2005 at 7.8 kWh/m²/day, and the cloudiest was 2010 at 5.2.
Average wind speed in Grafton during December is 3 m/s. The windiest Decembers were 1988 and 1994 at 3.5 m/s, while the calmest was 2023 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.7°C | 23.7°C | 24.5°C | 24.1°C | 24.3°C | +0.6°C |
| Avg High | 27.8°C | 27.8°C | 28.8°C | 28.1°C | 28.2°C | +0.4°C |
| Avg Low | 19.5°C | 19.7°C | 20.3°C | 20.1°C | 20.4°C | +0.9°C |
| Avg Rain | 140 mm | 136 mm | 99 mm | 114 mm | 167 mm | +28 mm |
December temperatures in Grafton have risen by about 0.5°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 14°C (2013) to a record high of 40.1°C (1990).
Rainfall in December is a relatively wet time of year, averaging 128 mm, with a wettest year of 400 mm.
A good time to visit Grafton
December is a good time to visit Grafton, with days averaging 28.1°C and nights around 20°C (mean 24.1°C, warmer than Grafton's yearly average) and higher rainfall. November and October are marginally more temperate, but December still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 28.9°C | 24.4°C | 19.9°C | 36.1°C | 16.9°C | 99 mm | 67% | 3 m/s | — |
| 2024 | 29.3°C | 25.4°C | 21.4°C | 35.4°C | 18.3°C | 96 mm | 74% | 2.7 m/s | 7.2 |
| 2023 | 30.4°C | 26.0°C | 21.6°C | 35.2°C | 18.0°C | 120 mm | 70% | 2.5 m/s | 7.1 |
| 2022 | 26.5°C | 22.5°C | 18.6°C | 34.5°C | 15.8°C | 83 mm | 68% | 3.2 m/s | 6.8 |
| 2021 | 26.1°C | 23.1°C | 20.0°C | 31.9°C | 16.8°C | 207 mm | 79% | 2.8 m/s | 6.5 |
| 2020 🌧️ | 27.8°C | 24.5°C | 21.1°C | 36.0°C | 18.5°C | 400 mm | 77% | 3.2 m/s | 5.7 |
| 2019 | 29.8°C | 25.2°C | 20.6°C | 35.6°C | 17.2°C | 65 mm | 62% | 2.9 m/s | 7.4 |
| 2018 | 29.0°C | 24.8°C | 20.5°C | 36.2°C | 18.3°C | 73 mm | 67% | 3.3 m/s | 7.3 |
| 2017 | 29.2°C | 24.9°C | 20.6°C | 36.0°C | 15.8°C | 101 mm | 71% | 2.9 m/s | 6.9 |
| 2016 | 30.7°C | 25.9°C | 21.0°C | 38.0°C | 18.8°C | 54 mm | 63% | 3.2 m/s | 6.7 |
| 2015 | 27.1°C | 23.4°C | 19.8°C | 34.8°C | 17.1°C | 116 mm | 71% | 3.2 m/s | 6.4 |
| 2014 | 28.4°C | 24.5°C | 20.5°C | 36.3°C | 17.8°C | 208 mm | 73% | 3.1 m/s | 6 |
| 2013 | 27.9°C | 23.4°C | 18.9°C | 37.4°C | 14.0°C | 39 mm | 68% | 2.9 m/s | 7.1 |
| 2012 | 28.7°C | 24.8°C | 20.8°C | 34.7°C | 17.8°C | 96 mm | 68% | 2.9 m/s | 6.5 |
| 2011 ❄️ | 24.6°C | 21.4°C | 18.3°C | 28.8°C | 15.2°C | 145 mm | 73% | 3.3 m/s | 5.6 |
| 2010 | 25.7°C | 22.9°C | 20.0°C | 30.3°C | 14.8°C | 238 mm | 80% | 2.7 m/s | 5.2 |
| 2009 | 29.2°C | 25.2°C | 21.1°C | 36.8°C | 16.3°C | 139 mm | 71% | 2.9 m/s | 6.3 |
| 2008 | 28.8°C | 24.3°C | 19.9°C | 34.3°C | 17.2°C | 108 mm | 69% | 3 m/s | 6.4 |
| 2007 | 26.6°C | 23.5°C | 20.4°C | 31.0°C | 18.6°C | 102 mm | 73% | 3.1 m/s | 5.3 |
| 2006 | 26.9°C | 22.9°C | 18.8°C | 34.1°C | 17.1°C | 73 mm | 66% | 3.1 m/s | 6.2 |
| 2005 | 31.1°C | 26.1°C | 21.2°C | 38.3°C | 16.1°C | 109 mm | 67% | 2.8 m/s | 7.8 |
| 2004 | 27.5°C | 23.6°C | 19.6°C | 37.2°C | 15.2°C | 130 mm | 71% | 3.3 m/s | 6.3 |
| 2003 | 29.1°C | 24.8°C | 20.5°C | 37.8°C | 17.1°C | 84 mm | 67% | 3.3 m/s | 6.4 |
| 2002 | 29.2°C | 24.7°C | 20.3°C | 37.8°C | 16.8°C | 96 mm | 61% | 3.1 m/s | 6.8 |
| 2001 | 30.6°C | 25.7°C | 20.9°C | 37.8°C | 18.0°C | 52 mm | 63% | 3.3 m/s | 6.8 |
| 2000 | 28.6°C | 24.6°C | 20.5°C | 35.9°C | 17.9°C | 96 mm | 68% | 3 m/s | 6.6 |
| 1999 | 25.4°C | 21.9°C | 18.3°C | 31.6°C | 16.4°C | 122 mm | 71% | 2.8 m/s | 6.6 |
| 1998 | 28.0°C | 24.1°C | 20.2°C | 34.7°C | 16.2°C | 102 mm | 72% | 2.9 m/s | 6.9 |
| 1997 | 30.8°C | 26.5°C | 22.2°C | 37.2°C | 19.3°C | 70 mm | 66% | 3.2 m/s | 6.7 |
| 1996 | 26.8°C | 23.0°C | 19.2°C | 35.0°C | 15.8°C | 127 mm | 73% | 2.8 m/s | 6.5 |
| 1995 | 27.3°C | 22.9°C | 18.5°C | 31.9°C | 14.2°C | 136 mm | 69% | 3.1 m/s | 7 |
| 1994 | 27.6°C | 23.5°C | 19.5°C | 36.0°C | 15.7°C | 149 mm | 68% | 3.5 m/s | 6.8 |
| 1993 | 27.4°C | 23.2°C | 18.9°C | 33.8°C | 14.9°C | 154 mm | 67% | 3 m/s | 6.7 |
| 1992 | 26.5°C | 22.8°C | 19.1°C | 33.5°C | 14.8°C | 142 mm | 72% | 3.3 m/s | 6.4 |
| 1991 | 26.0°C | 22.4°C | 18.8°C | 32.4°C | 16.4°C | 299 mm | 75% | 2.9 m/s | 6.6 |
| 1990 🔥 | 32.0°C | 27.0°C | 21.9°C | 40.1°C | 18.9°C | 58 mm | 61% | 3.3 m/s | 6.9 |
| 1989 | 26.6°C | 22.8°C | 18.9°C | 31.4°C | 16.6°C | 124 mm | 72% | 3.2 m/s | 6.6 |
| 1988 | 26.7°C | 23.5°C | 20.4°C | 33.6°C | 17.9°C | 226 mm | 77% | 3.5 m/s | 6 |
| 1987 | 28.3°C | 24.2°C | 20.1°C | 33.0°C | 15.4°C | 136 mm | 68% | 3.1 m/s | 6.5 |
| 1986 | 28.0°C | 23.5°C | 19.0°C | 37.2°C | 15.6°C | 53 mm | 65% | 3 m/s | 7.1 |
| 1985 | 29.0°C | 24.4°C | 19.8°C | 34.8°C | 15.7°C | 122 mm | 68% | 3 m/s | 6.9 |
| 1984 | 28.1°C | 23.5°C | 18.9°C | 35.3°C | 14.7°C | 138 mm | 67% | 2.9 m/s | 6.3 |
| 1983 | 25.0°C | 21.6°C | 18.2°C | 33.3°C | 15.4°C | 194 mm | 75% | 2.9 m/s | — |
| 1982 | 28.7°C | 24.2°C | 19.7°C | 33.1°C | 16.4°C | 150 mm | 68% | 2.9 m/s | — |
| 1981 | 29.7°C | 25.2°C | 20.8°C | 39.8°C | 18.1°C | 112 mm | 70% | 3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 28.1°C with lows near 20°C (mean 24.1°C), based on 45 years of NASA POWER data.
December averages 128 mm of rainfall in Grafton, a relatively wet time of year. The wettest on record was 400 mm in 2020.
The hottest December reached 40.1°C in 1990. The coldest dipped to 14°C in 2013.
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 28.1°C to 28.2°C and overnight lows from 19.5°C to 20.3°C over the same span.
December is one of the warmer months of the year in Grafton and a relatively wet time of year, so plan for around 28.1°C daytime highs and 20°C at night.
Not quite — December is the 10th coolest month in Grafton, averaging 24.1°C.
For December in Grafton, pack light layers you can adjust through the day, with typical highs of 28.1°C and lows of 20°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 70% — moderately humid.
Average wind speed in December is 3 m/s. The windiest December on record averaged 3.5 m/s (1988).
The wettest December on record was 2020 with 400 mm. On average, December sees 128 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 Grafton 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.
