Climate averages 1991–2020
Newcastle, Australia weather
in December.
A warm, moderately wet month: the 3rd warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Newcastle, Australia: daytime highs average 24.7°C and nights cool to about 18.6°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 70 mm of rain on roughly 10 days, which makes December a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 16 min on an average December day.
The nearest other city in this atlas is Maitland (30 km away). In December its highs average 27.5°C, 2.8°C warmer than Newcastle, Australia, with 71 mm of rain.
Among the 32 cities listed in Australia, Newcastle, Australia ranks 20th of 32 for the warmest December highs and joint 14th of 32 for the driest December (rainfall, lowest first). The mean December high of those 32 cities is 26.0°C; Newcastle, Australia is 1.3°C cooler than that mean.
From December to January, average highs rise by 1.4°C to 26.1°C, and monthly rainfall rises from 70 mm to 76 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Newcastle, Australia climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.1°C20.2°C | 20.2°C | 76 | 9.6 | 14.114 h |
| February | 25.5°C20.2°C | 20.2°C | 98 | 9.8 | 13.313 h |
| March | 23.9°C19.0°C | 19.0°C | 98 | 11.6 | 12.312 h |
| April | 21.7°C16.5°C | 16.5°C | 86 | 11.1 | 11.311 h |
| May | 18.9°C13.8°C | 13.8°C | 94 | 10.8 | 10.510 h |
| June | 16.6°C11.7°C | 11.7°C | 113 | 11.6 | 10.010 h |
| July | 16.1°C10.5°C | 10.5°C | 73 | 8.9 | 10.210 h |
| August | 17.4°C10.8°C | 10.8°C | 56 | 7.1 | 10.911 h |
| September | 20.0°C12.8°C | 12.8°C | 53 | 7.0 | 11.912 h |
| October | 21.8°C14.8°C | 14.8°C | 63 | 8.4 | 12.913 h |
| November | 23.1°C16.7°C | 16.7°C | 81 | 9.7 | 13.814 h |
| December, selected | 24.7°C18.6°C | 18.6°C | 70 | 9.8 | 14.314 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Maitland in DecemberAustralia · 30 kmHigh 27.5°C · Low 17.6°C · 71 mm rain
- Central Coast in DecemberAustralia · 67 kmHigh 24.4°C · Low 18.4°C · 70 mm rain
- Sydney in DecemberAustralia · 117 kmHigh 24.2°C · Low 17.8°C · 60 mm rain
- Blue Mountains in DecemberAustralia · 160 kmHigh 22.1°C · Low 11.0°C · 121 mm rain
- Wollongong in DecemberAustralia · 185 kmHigh 23.5°C · Low 17.5°C · 72 mm rain
- Coffs Harbour in DecemberAustralia · 319 kmHigh 25.7°C · Low 19.5°C · 150 mm rain
- Canberra in DecemberAustralia · 358 kmHigh 24.3°C · Low 12.1°C · 55 mm rain
- Tuggeranong in DecemberAustralia · 372 kmHigh 24.3°C · Low 12.1°C · 81 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Newcastle) is explained once on the Newcastle, Australia year overview and on the Sources, method and limits page.