December is one of the cooler months of the year in Niwari, with average highs near 28.8°C and lows around 6.4°C (mean 17.6°C). It is one of the drier months, averaging 6 mm of rainfall and 49% relative humidity across the period.
December is one of the cooler months of the year in Niwari. Across 45 years of records, the warmest December in Niwari was 2002 — when the month averaged 20.4°C — while the coldest was 2019 at 13.4°C. Typical December days reach 28.8°C with nights near 6.4°C. The long-term trend is cooling, about 0.3°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.8°C | 17.4°C | 19.1°C | 16.9°C | 16.5°C | -1.3°C |
| Avg High | 29.3°C | 28.5°C | 30.3°C | 28.2°C | 27.1°C | -2.2°C |
| Avg Low | 6.3°C | 6.4°C | 7.8°C | 5.7°C | 5.8°C | -0.5°C |
| Avg Rain | 5 mm | 8 mm | 3 mm | 8 mm | 8 mm | +3 mm |
December temperatures in Niwari have fallen by about 0.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 2°C (2019) to a record high of 31.6°C (2002).
Rainfall in December is one of the drier months, averaging 6 mm, with a wettest year of 63 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.4°C per decade while lows fell 0.2°C per decade, narrowing the gap between day and night.
A good time to visit Niwari
December is a good time to visit Niwari, with days averaging 28.8°C and nights around 6.4°C (mean 17.6°C, cooler than Niwari's yearly average) and low rainfall. February and November are marginally more temperate, but December still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 24.6°C | 5.7°C | 15.2°C | 0 mm | 69% | 1.3 m/s | — |
| 2024 | 26.4°C | 4.9°C | 15.7°C | 16 mm | 66% | 1.3 m/s | 3.7 |
| 2023 | 27.1°C | 8.3°C | 17.7°C | 13 mm | 63% | 1.3 m/s | 3.4 |
| 2022 | 26.8°C | 7.4°C | 17.1°C | 2 mm | 65% | 1.2 m/s | 4 |
| 2021 | 26.9°C | 4.2°C | 15.6°C | 7 mm | 63% | 1.4 m/s | 3.5 |
| 2020 | 30.7°C | 4.3°C | 17.5°C | 6 mm | 50% | 1.3 m/s | 3.7 |
| 2019 ❄️ | 24.9°C | 2.0°C | 13.4°C | 13 mm | 77% | 1.3 m/s | 3.2 |
| 2018 | 26.4°C | 3.5°C | 15.0°C | 0 mm | 53% | 1.3 m/s | 4.1 |
| 2017 | 29.5°C | 9.0°C | 19.2°C | 1 mm | 32% | 1.3 m/s | 3.8 |
| 2016 | 27.8°C | 7.2°C | 17.5°C | 0 mm | 49% | 1.4 m/s | 4.1 |
| 2015 | 31.2°C | 5.5°C | 18.3°C | 3 mm | 36% | 1.4 m/s | 4.1 |
| 2014 | 29.3°C | 4.2°C | 16.8°C | 41 mm | 48% | 1.4 m/s | 3.8 |
| 2013 | 27.4°C | 6.9°C | 17.2°C | 15 mm | 60% | 1.3 m/s | 3.8 |
| 2012 | 29.3°C | 5.6°C | 17.4°C | 0 mm | 48% | 1.4 m/s | 4.2 |
| 2011 | 29.6°C | 6.2°C | 17.9°C | 3 mm | 56% | 1.3 m/s | 4.1 |
| 2010 | 26.7°C | 6.6°C | 16.7°C | 1 mm | 60% | 1.3 m/s | 4.1 |
| 2009 | 29.3°C | 7.7°C | 18.5°C | 12 mm | 60% | 1.3 m/s | 3.9 |
| 2008 | 28.6°C | 8.2°C | 18.4°C | 0 mm | 59% | 1.2 m/s | 4 |
| 2007 | 30.4°C | 7.7°C | 19.1°C | 4 mm | 39% | 1.4 m/s | 3.9 |
| 2006 | 31.4°C | 9.0°C | 20.2°C | 0 mm | 43% | 1.4 m/s | 4 |
| 2005 | 29.0°C | 7.7°C | 18.3°C | 1 mm | 37% | 1.4 m/s | 4.2 |
| 2004 | 30.5°C | 6.7°C | 18.6°C | 2 mm | 46% | 1.3 m/s | 4.2 |
| 2003 | 29.5°C | 6.4°C | 17.9°C | 9 mm | 64% | 1.5 m/s | 4 |
| 2002 🔥 | 31.6°C | 9.1°C | 20.4°C | 5 mm | 38% | 1.5 m/s | 4.1 |
| 2001 | 31.5°C | 7.3°C | 19.4°C | 0 mm | 33% | 1.3 m/s | 4.3 |
| 2000 | 31.4°C | 8.5°C | 19.9°C | 1 mm | 20% | 1.5 m/s | 4.4 |
| 1999 | 27.5°C | 6.5°C | 17.0°C | 0 mm | 42% | 1.3 m/s | 4.7 |
| 1998 | 30.7°C | 7.4°C | 19.0°C | 0 mm | 33% | 1.4 m/s | 4.5 |
| 1997 🌧️ | 25.5°C | 5.4°C | 15.5°C | 63 mm | 77% | 1.4 m/s | 3 |
| 1996 | 27.1°C | 4.3°C | 15.7°C | 0 mm | 40% | 1.3 m/s | 4.3 |
| 1995 | 28.8°C | 7.6°C | 18.2°C | 9 mm | 52% | 1.4 m/s | 4 |
| 1994 | 30.6°C | 5.0°C | 17.8°C | 0 mm | 29% | 1.4 m/s | 4.6 |
| 1993 | 29.8°C | 6.6°C | 18.2°C | 0 mm | 37% | 1.3 m/s | 4.4 |
| 1992 | 28.1°C | 8.0°C | 18.1°C | 0 mm | 47% | 1.3 m/s | 4.6 |
| 1991 | 29.6°C | 5.1°C | 17.3°C | 9 mm | 42% | 1.5 m/s | 4.3 |
| 1990 | 26.8°C | 7.6°C | 17.2°C | 0 mm | 58% | 1.4 m/s | 4.2 |
| 1989 | 30.0°C | 7.3°C | 18.7°C | 7 mm | 31% | 1.5 m/s | 4.2 |
| 1988 | 31.2°C | 8.4°C | 19.8°C | 1 mm | 27% | 1.6 m/s | 4.3 |
| 1987 | 31.4°C | 7.4°C | 19.4°C | 8 mm | 39% | 1.4 m/s | 4.5 |
| 1986 | 30.1°C | 5.8°C | 18.0°C | 3 mm | 31% | 1.7 m/s | 4.3 |
| 1985 | 27.2°C | 5.0°C | 16.1°C | 0 mm | 64% | 1.3 m/s | 4.5 |
| 1984 | 30.5°C | 5.8°C | 18.1°C | 2 mm | 36% | 1.5 m/s | 4.6 |
| 1983 | 27.4°C | 5.4°C | 16.4°C | 3 mm | 58% | 1.4 m/s | — |
| 1982 | 28.0°C | 5.8°C | 16.9°C | 5 mm | 57% | 1.4 m/s | — |
| 1981 | 28.2°C | 5.8°C | 17.0°C | 12 mm | 53% | 1.5 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 28.8°C with lows near 6.4°C (mean 17.6°C), based on 45 years of NASA POWER data.
December averages 6 mm of rainfall in Niwari, one of the drier months. The wettest on record was 63 mm in 1997.
The hottest December reached 31.6°C in 2002. The coldest dipped to 2°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have fallen by about 0.6°C. Daytime highs moved from 28.3°C to 26.4°C and overnight lows from 5.6°C to 6.1°C over the same span.
December is one of the cooler months of the year in Niwari and one of the drier months, so plan for around 28.8°C daytime highs and 6.4°C at night.
Not quite — December is the 2nd coolest month in Niwari, averaging 17.6°C.
For December in Niwari, pack warm layers and a jacket for chilly mornings, with typical highs of 28.8°C and lows of 6.4°C.
Relative humidity in December averages 49% — relatively dry.
Average wind speed in December is 1.4 m/s. The windiest December on record averaged 1.7 m/s (1986).
The wettest December on record was 1997 with 63 mm. On average, December sees 6 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 Niwari 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.
