December is one of the warmer months of the year in Bicheno, with average highs near 19.5°C and lows around 10.5°C (mean 15°C). It is about average for rainfall, averaging 60 mm of rainfall and 69% relative humidity across the period.
December is one of the warmer months of the year in Bicheno. Across 45 years of records, the warmest December in Bicheno was 2015 — when the month averaged 17°C — while the coldest was 1984 at 12.3°C. Typical December days reach 19.5°C with nights near 10.5°C. The long-term trend is warming, about 0.3°C per decade.
December is about average for rainfall in Bicheno, averaging 60 mm of rainfall. The wettest December on record was 1985 with 185 mm, while the driest was 1994 at 7 mm.
Relative humidity in Bicheno during December averages 69%. The most humid December was 1985 at 81%, and the least humid was 1994 at 57%.
December receives about 6.8 kWh/m²/day of solar energy in Bicheno. The sunniest December was 2000 at 7.6 kWh/m²/day, and the cloudiest was 1985 at 6.1.
Average wind speed in Bicheno during December is 2.8 m/s. The windiest Decembers were 1993 and 1999 at 3.2 m/s, while the calmest were 1988, 1991 and 2011, among others at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.4°C | 14.7°C | 15.2°C | 15.6°C | 15.1°C | +0.7°C |
| Avg High | 18.8°C | 19.3°C | 19.7°C | 20.3°C | 19.6°C | +0.8°C |
| Avg Low | 10.1°C | 10.1°C | 10.6°C | 11.0°C | 10.6°C | +0.5°C |
| Avg Rain | 77 mm | 66 mm | 44 mm | 52 mm | 61 mm | -16 mm |
December temperatures in Bicheno have risen by about 0.8°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 4°C (1984) to a record high of 33.3°C (2019).
Rainfall in December is about average for rainfall, averaging 60 mm, with a wettest year of 185 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.4°C per decade while lows rose 0.2°C per decade, widening the gap between day and night.
One of the best times to visit Bicheno
December is one of the best times to visit Bicheno. Expect days averaging 19.5°C and nights around 10.5°C (mean 15°C) — warmer than Bicheno's yearly average — with moderate rainfall (60 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 | 19.8°C | 14.8°C | 9.9°C | 27.5°C | 5.5°C | 25 mm | 63% | 3.1 m/s | — |
| 2024 | 21.2°C | 16.5°C | 11.9°C | 26.5°C | 9.0°C | 67 mm | 68% | 2.7 m/s | 7.1 |
| 2023 | 20.3°C | 15.9°C | 11.6°C | 26.7°C | 9.0°C | 69 mm | 68% | 2.5 m/s | 6.4 |
| 2022 | 17.2°C | 13.5°C | 9.9°C | 26.3°C | 6.2°C | 85 mm | 79% | 2.8 m/s | 6.5 |
| 2021 | 20.4°C | 15.4°C | 10.5°C | 28.7°C | 7.3°C | 22 mm | 66% | 2.7 m/s | 7.2 |
| 2020 | 18.4°C | 14.2°C | 10.0°C | 28.5°C | 6.3°C | 99 mm | 71% | 2.9 m/s | 6.5 |
| 2019 | 20.7°C | 15.5°C | 10.3°C | 33.3°C | 6.3°C | 21 mm | 63% | 2.9 m/s | 6.9 |
| 2018 | 20.9°C | 16.5°C | 12.0°C | 28.8°C | 7.3°C | 62 mm | 71% | 2.6 m/s | 6.6 |
| 2017 | 21.1°C | 16.5°C | 11.9°C | 27.2°C | 8.3°C | 108 mm | 69% | 3 m/s | 6.8 |
| 2016 | 20.2°C | 15.6°C | 11.1°C | 27.8°C | 7.1°C | 57 mm | 70% | 2.7 m/s | 7 |
| 2015 🔥 | 22.3°C | 17.0°C | 11.8°C | 30.9°C | 7.7°C | 25 mm | 63% | 2.7 m/s | 7.5 |
| 2014 | 20.1°C | 15.6°C | 11.1°C | 26.4°C | 8.2°C | 65 mm | 71% | 2.6 m/s | 6.4 |
| 2013 | 19.4°C | 14.8°C | 10.3°C | 27.1°C | 6.0°C | 32 mm | 73% | 2.5 m/s | 6.5 |
| 2012 | 21.2°C | 16.0°C | 10.9°C | 25.7°C | 4.5°C | 38 mm | 63% | 2.6 m/s | 7 |
| 2011 | 18.7°C | 14.8°C | 10.8°C | 25.6°C | 6.1°C | 45 mm | 74% | 2.4 m/s | 6.8 |
| 2010 | 18.0°C | 14.0°C | 10.0°C | 23.2°C | 6.4°C | 63 mm | 72% | 2.9 m/s | 6.5 |
| 2009 | 19.9°C | 15.1°C | 10.2°C | 29.6°C | 7.3°C | 50 mm | 71% | 2.6 m/s | 7 |
| 2008 | 18.3°C | 13.8°C | 9.3°C | 25.0°C | 5.1°C | 76 mm | 70% | 2.9 m/s | 6.4 |
| 2007 | 20.6°C | 16.1°C | 11.6°C | 29.6°C | 7.7°C | 39 mm | 66% | 2.9 m/s | 6.6 |
| 2006 | 19.7°C | 14.8°C | 9.9°C | 32.4°C | 6.5°C | 40 mm | 63% | 3 m/s | 6.9 |
| 2005 | 20.0°C | 15.7°C | 11.3°C | 25.9°C | 8.9°C | 64 mm | 71% | 3 m/s | 7 |
| 2004 | 19.4°C | 14.9°C | 10.5°C | 27.4°C | 6.5°C | 28 mm | 71% | 2.8 m/s | 6.7 |
| 2003 | 21.1°C | 16.2°C | 11.3°C | 28.8°C | 8.0°C | 54 mm | 67% | 2.9 m/s | 7 |
| 2002 | 20.6°C | 15.9°C | 11.2°C | 28.5°C | 6.6°C | 21 mm | 66% | 2.9 m/s | 7.2 |
| 2001 | 16.7°C | 13.1°C | 9.6°C | 22.2°C | 4.5°C | 49 mm | 74% | 2.6 m/s | 6.3 |
| 2000 | 20.9°C | 16.0°C | 11.1°C | 27.2°C | 6.7°C | 24 mm | 61% | 3.1 m/s | 7.6 |
| 1999 | 19.8°C | 15.3°C | 10.7°C | 28.6°C | 6.1°C | 55 mm | 65% | 3.2 m/s | 6.9 |
| 1998 | 20.3°C | 15.5°C | 10.7°C | 30.3°C | 7.4°C | 70 mm | 68% | 3 m/s | 6.7 |
| 1997 | 19.8°C | 15.1°C | 10.4°C | 24.3°C | 7.6°C | 14 mm | 64% | 2.9 m/s | 7.4 |
| 1996 | 18.0°C | 13.2°C | 8.5°C | 24.6°C | 5.0°C | 34 mm | 66% | 2.7 m/s | 7.1 |
| 1995 | 17.1°C | 12.8°C | 8.5°C | 22.8°C | 4.2°C | 110 mm | 72% | 2.8 m/s | 6.6 |
| 1994 | 22.9°C | 16.9°C | 10.9°C | 30.8°C | 5.8°C | 7 mm | 57% | 2.6 m/s | 7.5 |
| 1993 | 18.5°C | 14.4°C | 10.3°C | 26.5°C | 5.8°C | 185 mm | 72% | 3.2 m/s | 6.4 |
| 1992 | 17.9°C | 14.1°C | 10.3°C | 23.8°C | 7.3°C | 39 mm | 75% | 2.5 m/s | 6.2 |
| 1991 | 18.7°C | 14.6°C | 10.5°C | 24.1°C | 6.4°C | 91 mm | 72% | 2.4 m/s | 6.6 |
| 1990 | 19.6°C | 15.0°C | 10.5°C | 27.6°C | 6.5°C | 53 mm | 68% | 2.9 m/s | 6.6 |
| 1989 | 19.9°C | 15.2°C | 10.6°C | 27.5°C | 7.2°C | 33 mm | 66% | 3 m/s | 7.4 |
| 1988 | 20.4°C | 15.6°C | 10.9°C | 26.5°C | 6.5°C | 52 mm | 73% | 2.4 m/s | 6.6 |
| 1987 | 17.9°C | 13.6°C | 9.4°C | 26.7°C | 4.7°C | 65 mm | 69% | 2.7 m/s | 6.8 |
| 1986 | 18.1°C | 13.8°C | 9.5°C | 22.0°C | 6.8°C | 73 mm | 73% | 2.9 m/s | 6.2 |
| 1985 🌧️ | 17.5°C | 14.2°C | 10.9°C | 20.9°C | 8.3°C | 185 mm | 81% | 2.6 m/s | 6.1 |
| 1984 ❄️ | 15.9°C | 12.3°C | 8.6°C | 20.3°C | 4.0°C | 79 mm | 73% | 3.1 m/s | 6.2 |
| 1983 | 20.4°C | 15.5°C | 10.6°C | 28.9°C | 7.4°C | 17 mm | 65% | 2.4 m/s | — |
| 1982 | 19.0°C | 14.4°C | 9.8°C | 24.6°C | 6.5°C | 158 mm | 69% | 2.7 m/s | — |
| 1981 | 19.9°C | 15.4°C | 10.9°C | 25.4°C | 7.7°C | 32 mm | 69% | 2.6 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 19.5°C with lows near 10.5°C (mean 15°C), based on 45 years of NASA POWER data.
December averages 60 mm of rainfall in Bicheno, about average for rainfall. The wettest on record was 185 mm in 1985.
The hottest December reached 33.3°C in 2019. The coldest dipped to 4°C in 1984.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.8°C. Daytime highs moved from 18.5°C to 19.8°C and overnight lows from 10.2°C to 10.8°C over the same span.
December is one of the warmer months of the year in Bicheno and about average for rainfall, so plan for around 19.5°C daytime highs and 10.5°C at night.
Not quite — December is the 9th coolest month in Bicheno, averaging 15°C.
For December in Bicheno, pack light layers you can adjust through the day, with typical highs of 19.5°C and lows of 10.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 69% — moderately humid.
Average wind speed in December is 2.8 m/s. The windiest December on record averaged 3.2 m/s (1993).
The wettest December on record was 1985 with 185 mm. On average, December sees 60 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 Bicheno 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.
