December is one of the warmer months of the year in Penola, with average highs near 24.6°C and lows around 11.2°C (mean 17.9°C). It is one of the drier months, averaging 35 mm of rainfall and 62% relative humidity across the period.
December is one of the warmer months of the year in Penola. Across 45 years of records, the warmest December in Penola was 2015 — when the month averaged 21.4°C — while the coldest was 2001 at 14.4°C. Typical December days reach 24.6°C with nights near 11.2°C. The long-term trend is warming, about 0.3°C per decade.
December is one of the drier months in Penola, averaging 35 mm of rainfall. The wettest December on record was 2010 with 105 mm, while the driest was 1982 at 5 mm.
Relative humidity in Penola during December averages 62%. The most humid December was 1992 at 74%, and the least humid was 2015 at 48%.
December receives about 7.1 kWh/m²/day of solar energy in Penola. The sunniest December was 2021 at 8.2 kWh/m²/day, and the cloudiest was 2001 at 5.9.
Average wind speed in Penola during December is 1.9 m/s. The windiest December was 2005 at 2.3 m/s, while the calmest was 1983 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.5°C | 17.6°C | 17.7°C | 18.8°C | 17.8°C | +0.3°C |
| Avg High | 24.2°C | 24.2°C | 24.4°C | 25.7°C | 24.5°C | +0.3°C |
| Avg Low | 10.9°C | 11.0°C | 11.0°C | 11.8°C | 11.2°C | +0.3°C |
| Avg Rain | 32 mm | 35 mm | 36 mm | 32 mm | 40 mm | +8 mm |
December temperatures in Penola have risen by about 0.5°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 4.6°C (1994) to a record high of 46.7°C (2019).
Rainfall in December is one of the drier months, averaging 35 mm, with a wettest year of 105 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 Penola
December is one of the best times to visit Penola. Expect days averaging 24.6°C and nights around 11.2°C (mean 17.9°C) — warmer than Penola's yearly average — with moderate rainfall (35 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 | 24.7°C | 17.7°C | 10.8°C | 38.5°C | 6.9°C | 38 mm | 57% | 2 m/s | — |
| 2024 | 26.2°C | 19.3°C | 12.5°C | 37.6°C | 8.9°C | 31 mm | 60% | 1.9 m/s | 7.5 |
| 2023 | 24.3°C | 18.0°C | 11.8°C | 34.7°C | 8.4°C | 66 mm | 67% | 2 m/s | 6.4 |
| 2022 | 24.5°C | 17.6°C | 10.6°C | 39.7°C | 6.7°C | 34 mm | 62% | 1.7 m/s | 7.3 |
| 2021 | 25.4°C | 18.3°C | 11.2°C | 37.9°C | 7.2°C | 7 mm | 58% | 1.9 m/s | 8.2 |
| 2020 | 21.7°C | 15.9°C | 10.1°C | 34.5°C | 5.8°C | 65 mm | 65% | 1.9 m/s | 6.9 |
| 2019 | 27.7°C | 19.9°C | 12.1°C | 46.7°C | 8.2°C | 12 mm | 55% | 2 m/s | 7.6 |
| 2018 | 27.9°C | 20.3°C | 12.7°C | 39.1°C | 9.3°C | 36 mm | 59% | 1.9 m/s | 6.9 |
| 2017 | 25.5°C | 19.0°C | 12.5°C | 39.3°C | 8.3°C | 11 mm | 60% | 1.9 m/s | 7 |
| 2016 | 25.3°C | 18.3°C | 11.3°C | 38.5°C | 6.7°C | 31 mm | 59% | 1.9 m/s | 7.3 |
| 2015 🔥 | 29.8°C | 21.4°C | 13.0°C | 41.9°C | 8.1°C | 28 mm | 48% | 1.8 m/s | 7.9 |
| 2014 | 24.5°C | 18.1°C | 11.6°C | 33.7°C | 7.6°C | 25 mm | 63% | 1.9 m/s | 7.2 |
| 2013 | 23.4°C | 16.9°C | 10.5°C | 37.3°C | 7.1°C | 30 mm | 66% | 1.7 m/s | 7.3 |
| 2012 | 24.6°C | 18.1°C | 11.5°C | 37.6°C | 7.0°C | 19 mm | 60% | 1.8 m/s | 7.3 |
| 2011 | 25.8°C | 18.5°C | 11.2°C | 35.3°C | 6.3°C | 23 mm | 61% | 1.7 m/s | 7.7 |
| 2010 🌧️ | 22.5°C | 17.0°C | 11.4°C | 32.8°C | 5.8°C | 105 mm | 70% | 1.8 m/s | 7.1 |
| 2009 | 25.2°C | 18.2°C | 11.1°C | 38.5°C | 7.9°C | 33 mm | 61% | 1.8 m/s | 7.5 |
| 2008 | 21.8°C | 16.4°C | 10.9°C | 29.5°C | 7.0°C | 96 mm | 67% | 2 m/s | 6.6 |
| 2007 | 26.0°C | 18.8°C | 11.5°C | 42.3°C | 6.8°C | 22 mm | 61% | 1.8 m/s | 7.3 |
| 2006 | 26.0°C | 18.2°C | 10.3°C | 42.1°C | 6.3°C | 12 mm | 52% | 2 m/s | 7.7 |
| 2005 | 25.1°C | 18.4°C | 11.7°C | 39.2°C | 8.8°C | 41 mm | 59% | 2.3 m/s | 7 |
| 2004 | 24.6°C | 18.3°C | 12.0°C | 35.5°C | 7.0°C | 23 mm | 65% | 1.8 m/s | 7.2 |
| 2003 | 26.0°C | 18.9°C | 11.9°C | 38.5°C | 7.4°C | 41 mm | 61% | 1.9 m/s | 7.3 |
| 2002 | 25.2°C | 18.2°C | 11.2°C | 35.5°C | 5.6°C | 30 mm | 59% | 2.1 m/s | 6.9 |
| 2001 ❄️ | 19.6°C | 14.4°C | 9.2°C | 28.8°C | 7.1°C | 50 mm | 73% | 1.8 m/s | 5.9 |
| 2000 | 24.1°C | 17.3°C | 10.6°C | 34.0°C | 8.2°C | 10 mm | 64% | 1.7 m/s | 7.9 |
| 1999 | 24.0°C | 17.8°C | 11.6°C | 34.8°C | 6.8°C | 66 mm | 63% | 2 m/s | 6.7 |
| 1998 | 25.9°C | 18.9°C | 11.9°C | 40.9°C | 8.3°C | 19 mm | 60% | 2 m/s | 7 |
| 1997 | 24.8°C | 18.0°C | 11.2°C | 33.2°C | 8.5°C | 11 mm | 63% | 2 m/s | 7.2 |
| 1996 | 22.6°C | 16.0°C | 9.3°C | 33.3°C | 6.3°C | 16 mm | 61% | 1.8 m/s | 7.2 |
| 1995 | 22.7°C | 16.1°C | 9.5°C | 30.6°C | 6.5°C | 30 mm | 62% | 2 m/s | 7.1 |
| 1994 | 27.0°C | 19.3°C | 11.6°C | 37.9°C | 4.6°C | 33 mm | 55% | 1.8 m/s | 7.7 |
| 1993 | 23.2°C | 16.7°C | 10.3°C | 34.3°C | 6.8°C | 69 mm | 64% | 2 m/s | 7 |
| 1992 | 23.5°C | 17.8°C | 12.1°C | 30.6°C | 7.6°C | 52 mm | 74% | 1.8 m/s | 6.1 |
| 1991 | 23.8°C | 17.2°C | 10.5°C | 36.3°C | 7.6°C | 19 mm | 65% | 1.9 m/s | 7.2 |
| 1990 | 24.6°C | 18.3°C | 11.9°C | 34.5°C | 8.7°C | 35 mm | 63% | 1.9 m/s | 6.8 |
| 1989 | 24.8°C | 18.0°C | 11.3°C | 35.3°C | 7.7°C | 18 mm | 61% | 1.8 m/s | 7.6 |
| 1988 | 25.0°C | 18.2°C | 11.3°C | 36.3°C | 7.0°C | 22 mm | 64% | 1.8 m/s | 7 |
| 1987 | 24.9°C | 17.5°C | 10.2°C | 35.7°C | 6.2°C | 45 mm | 59% | 1.8 m/s | 7.1 |
| 1986 | 21.4°C | 15.7°C | 10.0°C | 36.6°C | 5.3°C | 74 mm | 67% | 2 m/s | 6.7 |
| 1985 | 22.8°C | 17.2°C | 11.6°C | 31.6°C | 9.3°C | 53 mm | 66% | 2.1 m/s | 6.3 |
| 1984 | 22.9°C | 16.7°C | 10.4°C | 33.1°C | 6.9°C | 25 mm | 66% | 2.1 m/s | 7 |
| 1983 | 25.4°C | 18.2°C | 11.1°C | 37.2°C | 6.3°C | 35 mm | 62% | 1.6 m/s | — |
| 1982 | 26.2°C | 18.7°C | 11.2°C | 34.3°C | 6.9°C | 5 mm | 54% | 1.9 m/s | — |
| 1981 | 24.4°C | 17.5°C | 10.6°C | 36.8°C | 7.5°C | 9 mm | 62% | 1.8 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 24.6°C with lows near 11.2°C (mean 17.9°C), based on 45 years of NASA POWER data.
December averages 35 mm of rainfall in Penola, one of the drier months. The wettest on record was 105 mm in 2010.
The hottest December reached 46.7°C in 2019. The coldest dipped to 4.6°C in 1994.
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 24.3°C to 25°C and overnight lows from 11°C to 11.4°C over the same span.
December is one of the warmer months of the year in Penola and one of the drier months, so plan for around 24.6°C daytime highs and 11.2°C at night.
Not quite — December is the 9th coolest month in Penola, averaging 17.9°C.
For December in Penola, pack light layers you can adjust through the day, with typical highs of 24.6°C and lows of 11.2°C.
Relative humidity in December averages 62% — moderately humid.
Average wind speed in December is 1.9 m/s. The windiest December on record averaged 2.3 m/s (2005).
The wettest December on record was 2010 with 105 mm. On average, December sees 35 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 Penola 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.
