December is one of the warmer months of the year in Newcastle, with average highs near 25.1°C and lows around 19.3°C (mean 22.2°C). It is about average for rainfall, averaging 78 mm of rainfall and 72% relative humidity across the period.
December is one of the warmer months of the year in Newcastle. Across 45 years of records, the warmest December in Newcastle was 1990 — when the month averaged 24.4°C — while the coldest was 2011 at 19.7°C. Typical December days reach 25.1°C with nights near 19.3°C. The long-term trend is warming, about 0.2°C per decade.
December is about average for rainfall in Newcastle, averaging 78 mm of rainfall. The wettest December on record was 1991 with 192 mm, while the driest was 2019 at 5 mm.
Relative humidity in Newcastle during December averages 72%. The most humid December was 1992 at 80%, and the least humid was 2019 at 65%.
December receives about 6.7 kWh/m²/day of solar energy in Newcastle. The sunniest December was 2005 at 8 kWh/m²/day, and the cloudiest was 2011 at 5.5.
Average wind speed in Newcastle during December is 2.9 m/s. The windiest December was 2002 at 3.2 m/s, while the calmest were 1981, 1982 and 2024 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.8°C | 21.8°C | 22.4°C | 22.4°C | 22.4°C | +0.6°C |
| Avg High | 24.9°C | 24.7°C | 25.3°C | 25.4°C | 25.2°C | +0.3°C |
| Avg Low | 18.8°C | 19.0°C | 19.5°C | 19.5°C | 19.6°C | +0.8°C |
| Avg Rain | 77 mm | 86 mm | 76 mm | 75 mm | 72 mm | -5 mm |
December temperatures in Newcastle have risen by about 0.5°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 14.1°C (2013) to a record high of 36°C (2019).
Rainfall in December is about average for rainfall, averaging 78 mm, with a wettest year of 192 mm.
One of the best times to visit Newcastle
December is one of the best times to visit Newcastle. Expect days averaging 25.1°C and nights around 19.3°C (mean 22.2°C) — warmer than Newcastle's yearly average — with moderate rainfall (78 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 | 26.0°C | 22.7°C | 19.5°C | 34.5°C | 15.8°C | 64 mm | 68% | 2.7 m/s | — |
| 2024 | 26.7°C | 23.6°C | 20.5°C | 32.1°C | 17.9°C | 27 mm | 73% | 2.5 m/s | 7.3 |
| 2023 | 26.7°C | 23.7°C | 20.6°C | 34.4°C | 18.4°C | 73 mm | 75% | 2.6 m/s | 6.9 |
| 2022 | 23.1°C | 20.4°C | 17.7°C | 27.7°C | 15.0°C | 39 mm | 69% | 3 m/s | 7 |
| 2021 | 24.3°C | 22.0°C | 19.6°C | 30.3°C | 16.0°C | 70 mm | 77% | 2.8 m/s | 6.7 |
| 2020 | 24.4°C | 22.0°C | 19.7°C | 32.3°C | 17.3°C | 158 mm | 75% | 3 m/s | 5.6 |
| 2019 | 26.6°C | 23.1°C | 19.6°C | 36.0°C | 16.3°C | 5 mm | 65% | 2.9 m/s | 7.4 |
| 2018 | 26.2°C | 23.0°C | 19.9°C | 31.6°C | 17.7°C | 89 mm | 73% | 2.8 m/s | 7.4 |
| 2017 | 26.5°C | 23.4°C | 20.3°C | 33.7°C | 17.4°C | 61 mm | 74% | 2.7 m/s | 6.5 |
| 2016 | 27.2°C | 23.7°C | 20.3°C | 34.2°C | 18.1°C | 63 mm | 71% | 2.8 m/s | 6.9 |
| 2015 | 25.1°C | 22.2°C | 19.3°C | 31.6°C | 16.9°C | 118 mm | 71% | 2.9 m/s | 6.7 |
| 2014 | 25.4°C | 22.7°C | 19.9°C | 30.8°C | 18.0°C | 133 mm | 74% | 2.7 m/s | 6.4 |
| 2013 | 24.8°C | 21.8°C | 18.8°C | 32.2°C | 14.1°C | 26 mm | 72% | 2.8 m/s | 7.4 |
| 2012 | 25.5°C | 22.5°C | 19.5°C | 33.1°C | 16.4°C | 80 mm | 72% | 3.1 m/s | 6.2 |
| 2011 ❄️ | 21.5°C | 19.7°C | 17.9°C | 27.0°C | 15.2°C | 105 mm | 75% | 3.1 m/s | 5.5 |
| 2010 | 24.9°C | 22.2°C | 19.6°C | 27.9°C | 14.6°C | 69 mm | 74% | 2.7 m/s | 6.1 |
| 2009 | 25.5°C | 22.7°C | 20.0°C | 32.0°C | 16.6°C | 78 mm | 74% | 3 m/s | 6.1 |
| 2008 | 25.2°C | 22.0°C | 18.9°C | 30.4°C | 17.3°C | 82 mm | 70% | 2.7 m/s | 6.6 |
| 2007 | 24.0°C | 21.9°C | 19.8°C | 27.3°C | 17.6°C | 126 mm | 77% | 3 m/s | 6 |
| 2006 | 24.2°C | 21.4°C | 18.6°C | 31.1°C | 14.3°C | 79 mm | 72% | 3.1 m/s | 6.6 |
| 2005 | 27.4°C | 23.8°C | 20.3°C | 34.4°C | 16.1°C | 25 mm | 67% | 2.6 m/s | 8 |
| 2004 | 24.1°C | 21.5°C | 18.8°C | 34.0°C | 15.8°C | 85 mm | 73% | 3.1 m/s | 6.7 |
| 2003 | 25.6°C | 22.8°C | 20.0°C | 32.0°C | 17.8°C | 49 mm | 73% | 3 m/s | 6.4 |
| 2002 | 24.9°C | 22.0°C | 19.1°C | 33.3°C | 16.4°C | 133 mm | 71% | 3.2 m/s | 6.8 |
| 2001 | 26.0°C | 22.7°C | 19.5°C | 33.7°C | 17.0°C | 54 mm | 69% | 2.8 m/s | 6.6 |
| 2000 | 26.3°C | 23.3°C | 20.3°C | 33.3°C | 16.4°C | 54 mm | 69% | 2.6 m/s | 7.1 |
| 1999 | 23.6°C | 21.1°C | 18.7°C | 29.2°C | 17.1°C | 67 mm | 73% | 3.1 m/s | 6.5 |
| 1998 | 25.0°C | 22.5°C | 19.9°C | 30.2°C | 16.6°C | 46 mm | 74% | 2.8 m/s | 7 |
| 1997 | 27.2°C | 24.0°C | 20.8°C | 33.4°C | 18.8°C | 46 mm | 69% | 2.8 m/s | 6.8 |
| 1996 | 24.4°C | 21.2°C | 18.1°C | 30.1°C | 15.7°C | 67 mm | 71% | 3 m/s | 6.7 |
| 1995 | 23.0°C | 20.3°C | 17.7°C | 28.9°C | 14.5°C | 101 mm | 74% | 3.1 m/s | 6.5 |
| 1994 | 24.5°C | 21.7°C | 18.9°C | 33.9°C | 15.9°C | 68 mm | 73% | 3.1 m/s | 6.8 |
| 1993 | 24.8°C | 21.7°C | 18.6°C | 30.3°C | 16.0°C | 51 mm | 70% | 2.9 m/s | 6.5 |
| 1992 | 22.8°C | 20.7°C | 18.6°C | 28.5°C | 15.5°C | 183 mm | 80% | 2.9 m/s | 6.1 |
| 1991 🌧️ | 23.4°C | 20.6°C | 17.9°C | 28.8°C | 15.3°C | 192 mm | 74% | 2.8 m/s | 6.4 |
| 1990 🔥 | 28.2°C | 24.4°C | 20.6°C | 35.5°C | 16.7°C | 37 mm | 69% | 2.6 m/s | 7.4 |
| 1989 | 24.1°C | 21.2°C | 18.3°C | 30.2°C | 16.3°C | 102 mm | 72% | 2.8 m/s | 6.9 |
| 1988 | 24.7°C | 22.2°C | 19.6°C | 30.6°C | 17.0°C | 92 mm | 77% | 3 m/s | 6 |
| 1987 | 24.9°C | 22.0°C | 19.1°C | 32.8°C | 15.8°C | 99 mm | 71% | 3 m/s | 6.4 |
| 1986 | 24.3°C | 21.3°C | 18.2°C | 30.2°C | 15.9°C | 21 mm | 66% | 3.1 m/s | 7.8 |
| 1985 | 26.1°C | 22.8°C | 19.5°C | 32.4°C | 15.7°C | 76 mm | 68% | 2.6 m/s | 6.9 |
| 1984 | 24.7°C | 21.5°C | 18.3°C | 30.9°C | 15.6°C | 79 mm | 67% | 2.9 m/s | 7.2 |
| 1983 | 24.1°C | 21.1°C | 18.1°C | 34.5°C | 15.3°C | 118 mm | 72% | 2.7 m/s | — |
| 1982 | 25.2°C | 22.0°C | 18.9°C | 32.7°C | 16.8°C | 29 mm | 69% | 2.5 m/s | — |
| 1981 | 25.6°C | 22.4°C | 19.2°C | 33.4°C | 16.9°C | 72 mm | 71% | 2.5 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 25.1°C with lows near 19.3°C (mean 22.2°C), based on 45 years of NASA POWER data.
December averages 78 mm of rainfall in Newcastle, about average for rainfall. The wettest on record was 192 mm in 1991.
The hottest December reached 36°C in 2019. The coldest dipped to 14.1°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 25.1°C to 25.4°C and overnight lows from 18.8°C to 19.6°C over the same span.
December is one of the warmer months of the year in Newcastle and about average for rainfall, so plan for around 25.1°C daytime highs and 19.3°C at night.
Not quite — December is the 9th coolest month in Newcastle, averaging 22.2°C.
For December in Newcastle, pack light layers you can adjust through the day, with typical highs of 25.1°C and lows of 19.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 72% — moderately humid.
Average wind speed in December is 2.9 m/s. The windiest December on record averaged 3.2 m/s (2002).
The wettest December on record was 1991 with 192 mm. On average, December sees 78 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 Newcastle 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.
