December is one of the warmer months of the year in Katoomba, with average highs near 25.3°C and lows around 11.7°C (mean 18.5°C). It is about average for rainfall, averaging 77 mm of rainfall and 62% relative humidity across the period.
December is one of the warmer months of the year in Katoomba. Across 45 years of records, the warmest December in Katoomba was 2019 — when the month averaged 21.4°C — while the coldest was 2011 at 15.1°C. Typical December days reach 25.3°C with nights near 11.7°C. The long-term trend is warming, about 0.4°C per decade.
December is about average for rainfall in Katoomba, averaging 77 mm of rainfall. The wettest December on record was 1992 with 178 mm, while the driest was 2019 at 3 mm.
Relative humidity in Katoomba during December averages 62%. The most humid December was 1992 at 78%, and the least humid was 2019 at 42%.
December receives about 6.6 kWh/m²/day of solar energy in Katoomba. The sunniest December was 2005 at 8.4 kWh/m²/day, and the cloudiest was 2011 at 5.1.
Average wind speed in Katoomba during December is 0.5 m/s. The windiest Decembers were 1984, 2005 and 2020 at 0.6 m/s, while the calmest were 2018, 2021 and 2022, among others at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.8°C | 18.0°C | 18.9°C | 19.2°C | 18.6°C | +0.8°C |
| Avg High | 24.6°C | 24.7°C | 25.9°C | 25.9°C | 25.2°C | +0.6°C |
| Avg Low | 11.1°C | 11.3°C | 12.0°C | 12.4°C | 12.0°C | +0.9°C |
| Avg Rain | 76 mm | 84 mm | 67 mm | 81 mm | 77 mm | +1 mm |
December temperatures in Katoomba have risen by about 0.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 2.7°C (1987) to a record high of 37.4°C (2019).
Rainfall in December is about average for rainfall, averaging 77 mm, with a wettest year of 178 mm.
One of the best times to visit Katoomba
December is one of the best times to visit Katoomba. Expect days averaging 25.3°C and nights around 11.7°C (mean 18.5°C) — warmer than Katoomba's yearly average — with moderate rainfall (77 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 | 27.6°C | 19.7°C | 11.8°C | 35.0°C | 4.1°C | 52 mm | 52% | 0.5 m/s | — |
| 2024 | 27.7°C | 20.6°C | 13.5°C | 33.5°C | 7.7°C | 54 mm | 59% | 0.5 m/s | 7.5 |
| 2023 | 27.2°C | 20.5°C | 13.7°C | 34.5°C | 9.6°C | 94 mm | 64% | 0.5 m/s | 6.5 |
| 2022 | 21.6°C | 15.4°C | 9.2°C | 28.2°C | 3.4°C | 33 mm | 68% | 0.4 m/s | 7 |
| 2021 | 23.1°C | 17.4°C | 11.7°C | 28.8°C | 6.4°C | 101 mm | 75% | 0.4 m/s | 6.3 |
| 2020 | 24.0°C | 18.0°C | 12.0°C | 34.6°C | 7.3°C | 127 mm | 69% | 0.6 m/s | 5.6 |
| 2019 🔥 | 29.5°C | 21.4°C | 13.2°C | 37.4°C | 6.2°C | 3 mm | 42% | 0.5 m/s | 7.2 |
| 2018 | 27.4°C | 20.2°C | 13.0°C | 35.4°C | 6.0°C | 90 mm | 60% | 0.4 m/s | 7 |
| 2017 | 27.0°C | 20.3°C | 13.6°C | 35.9°C | 8.8°C | 80 mm | 63% | 0.5 m/s | 6.3 |
| 2016 | 27.3°C | 20.6°C | 13.9°C | 33.2°C | 6.6°C | 74 mm | 60% | 0.5 m/s | 6.6 |
| 2015 | 26.6°C | 19.4°C | 12.2°C | 33.6°C | 7.9°C | 76 mm | 57% | 0.5 m/s | 6.7 |
| 2014 | 25.0°C | 18.8°C | 12.7°C | 31.1°C | 7.6°C | 142 mm | 66% | 0.5 m/s | 6.4 |
| 2013 | 27.5°C | 19.6°C | 11.6°C | 35.1°C | 4.6°C | 40 mm | 52% | 0.5 m/s | 7.5 |
| 2012 | 26.8°C | 19.5°C | 12.1°C | 32.6°C | 5.8°C | 45 mm | 57% | 0.5 m/s | 6.2 |
| 2011 ❄️ | 20.4°C | 15.1°C | 9.9°C | 25.8°C | 2.7°C | 98 mm | 77% | 0.4 m/s | 5.1 |
| 2010 | 21.9°C | 16.7°C | 11.5°C | 29.6°C | 4.0°C | 161 mm | 78% | 0.5 m/s | 6 |
| 2009 | 27.0°C | 19.8°C | 12.5°C | 34.0°C | 6.4°C | 88 mm | 57% | 0.5 m/s | 6.6 |
| 2008 | 24.1°C | 17.7°C | 11.3°C | 28.2°C | 5.7°C | 105 mm | 62% | 0.5 m/s | 6.8 |
| 2007 | 22.7°C | 17.3°C | 11.9°C | 28.0°C | 7.6°C | 100 mm | 76% | 0.4 m/s | 5.6 |
| 2006 | 26.3°C | 19.0°C | 11.7°C | 33.9°C | 3.5°C | 57 mm | 57% | 0.5 m/s | 6.2 |
| 2005 | 27.2°C | 19.6°C | 11.9°C | 36.4°C | 6.5°C | 41 mm | 50% | 0.6 m/s | 8.4 |
| 2004 | 25.0°C | 18.2°C | 11.4°C | 33.5°C | 5.0°C | 98 mm | 64% | 0.4 m/s | 6.7 |
| 2003 | 26.7°C | 19.7°C | 12.8°C | 33.8°C | 7.3°C | 67 mm | 62% | 0.5 m/s | 6.2 |
| 2002 | 26.8°C | 19.3°C | 11.8°C | 34.9°C | 4.3°C | 52 mm | 55% | 0.5 m/s | 6.8 |
| 2001 | 26.3°C | 19.2°C | 12.0°C | 33.3°C | 6.8°C | 24 mm | 49% | 0.5 m/s | 6.9 |
| 2000 | 26.4°C | 19.3°C | 12.2°C | 31.7°C | 6.4°C | 38 mm | 59% | 0.4 m/s | 7.3 |
| 1999 | 22.5°C | 16.6°C | 10.8°C | 28.9°C | 5.4°C | 90 mm | 69% | 0.4 m/s | 6.3 |
| 1998 | 25.4°C | 18.9°C | 12.4°C | 30.9°C | 6.1°C | 52 mm | 65% | 0.4 m/s | 6.8 |
| 1997 | 28.6°C | 20.9°C | 13.2°C | 33.3°C | 8.6°C | 60 mm | 54% | 0.5 m/s | 6.6 |
| 1996 | 24.5°C | 17.4°C | 10.3°C | 32.3°C | 5.8°C | 86 mm | 60% | 0.5 m/s | 6.7 |
| 1995 | 23.1°C | 16.4°C | 9.8°C | 30.2°C | 3.0°C | 92 mm | 65% | 0.5 m/s | 6.7 |
| 1994 | 27.6°C | 19.6°C | 11.7°C | 35.8°C | 4.7°C | 69 mm | 58% | 0.5 m/s | 6.9 |
| 1993 | 24.0°C | 17.4°C | 10.8°C | 31.8°C | 5.7°C | 48 mm | 63% | 0.5 m/s | 6.3 |
| 1992 🌧️ | 21.2°C | 16.0°C | 10.9°C | 25.7°C | 5.8°C | 178 mm | 78% | 0.5 m/s | 5.7 |
| 1991 | 22.5°C | 16.2°C | 10.0°C | 31.6°C | 4.4°C | 134 mm | 67% | 0.5 m/s | 6.1 |
| 1990 | 27.7°C | 20.2°C | 12.8°C | 33.5°C | 6.2°C | 35 mm | 56% | 0.5 m/s | 7.5 |
| 1989 | 25.1°C | 18.1°C | 11.1°C | 32.9°C | 5.5°C | 72 mm | 62% | 0.5 m/s | 6.8 |
| 1988 | 24.0°C | 18.2°C | 12.5°C | 30.2°C | 6.3°C | 135 mm | 74% | 0.5 m/s | 5.7 |
| 1987 | 24.5°C | 17.6°C | 10.8°C | 33.6°C | 2.7°C | 100 mm | 61% | 0.5 m/s | 6.4 |
| 1986 | 23.1°C | 16.3°C | 9.4°C | 30.4°C | 5.0°C | 33 mm | 61% | 0.5 m/s | 7.4 |
| 1985 | 23.1°C | 17.2°C | 11.2°C | 29.7°C | 6.5°C | 67 mm | 63% | 0.5 m/s | 6.8 |
| 1984 | 23.9°C | 16.9°C | 9.8°C | 32.3°C | 5.8°C | 52 mm | 53% | 0.6 m/s | 7.2 |
| 1983 | 23.6°C | 17.3°C | 10.9°C | 32.8°C | 6.2°C | 112 mm | 69% | 0.5 m/s | — |
| 1982 | 28.2°C | 20.3°C | 12.5°C | 35.3°C | 7.0°C | 25 mm | 50% | 0.5 m/s | — |
| 1981 | 25.7°C | 18.7°C | 11.6°C | 32.9°C | 7.0°C | 88 mm | 58% | 0.5 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 25.3°C with lows near 11.7°C (mean 18.5°C), based on 45 years of NASA POWER data.
December averages 77 mm of rainfall in Katoomba, about average for rainfall. The wettest on record was 178 mm in 1992.
The hottest December reached 37.4°C in 2019. The coldest dipped to 2.7°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.6°C. Daytime highs moved from 24.9°C to 25.4°C and overnight lows from 11.2°C to 12°C over the same span.
December is one of the warmer months of the year in Katoomba and about average for rainfall, so plan for around 25.3°C daytime highs and 11.7°C at night.
Not quite — December is the 10th coolest month in Katoomba, averaging 18.5°C.
For December in Katoomba, pack light layers you can adjust through the day, with typical highs of 25.3°C and lows of 11.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 62% — moderately humid.
Average wind speed in December is 0.5 m/s. The windiest December on record averaged 0.6 m/s (1984).
The wettest December on record was 1992 with 178 mm. On average, December sees 77 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 Katoomba 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.
