December is one of the warmer months of the year in Katanning, with average highs near 30.1°C and lows around 12.5°C (mean 21.3°C). It is one of the drier months, averaging 16 mm of rainfall and 50% relative humidity across the period.
December is one of the warmer months of the year in Katanning. Across 45 years of records, the warmest December in Katanning was 2019 — when the month averaged 25.1°C — while the coldest was 2001 at 18.4°C. Typical December days reach 30.1°C with nights near 12.5°C. The long-term trend is warming, about 0.3°C per decade.
December is one of the drier months in Katanning, averaging 16 mm of rainfall. The wettest December on record was 2011 with 103 mm, while the driest was 2025 at 1 mm.
Relative humidity in Katanning during December averages 50%. The most humid December was 2011 at 62%, and the least humid was 2019 at 42%.
December receives about 8.3 kWh/m²/day of solar energy in Katanning. The sunniest Decembers were 1994 and 2000 at 8.8 kWh/m²/day, and the cloudiest was 2011 at 7.1.
Average wind speed in Katanning during December is 4.2 m/s. The windiest December was 2023 at 4.8 m/s, while the calmest were 2008 and 2012 at 3.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 20.7°C | 21.4°C | 21.1°C | 21.6°C | 22.2°C | +1.5°C |
| Avg High | 29.5°C | 30.1°C | 29.8°C | 30.4°C | 31.2°C | +1.7°C |
| Avg Low | 11.9°C | 12.6°C | 12.3°C | 12.9°C | 13.2°C | +1.3°C |
| Avg Rain | 14 mm | 13 mm | 14 mm | 29 mm | 5 mm | -9 mm |
December temperatures in Katanning have risen by about 1.7°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 5.6°C (2002) to a record high of 43.7°C (1997).
Rainfall in December is one of the drier months, averaging 16 mm, with a wettest year of 103 mm.
One of the best times to visit Katanning
December is one of the best times to visit Katanning. Expect days averaging 30.1°C and nights around 12.5°C (mean 21.3°C) — warmer than Katanning's yearly average — with low rainfall (16 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 | 31.6°C | 22.6°C | 13.5°C | 40.9°C | 8.7°C | 1 mm | 48% | 4.2 m/s | — |
| 2024 | 32.3°C | 22.9°C | 13.6°C | 41.5°C | 9.9°C | 3 mm | 49% | 4.7 m/s | 8.4 |
| 2023 | 30.9°C | 22.2°C | 13.6°C | 37.3°C | 9.3°C | 3 mm | 49% | 4.8 m/s | 8.2 |
| 2022 | 29.7°C | 21.2°C | 12.7°C | 38.7°C | 8.1°C | 5 mm | 53% | 4.4 m/s | 8.2 |
| 2021 | 31.6°C | 22.3°C | 13.0°C | 39.6°C | 8.4°C | 7 mm | 49% | 4.3 m/s | 8.5 |
| 2020 | 30.9°C | 21.8°C | 12.6°C | 41.2°C | 6.9°C | 9 mm | 47% | 4.5 m/s | 8.7 |
| 2019 🔥 | 34.8°C | 25.1°C | 15.3°C | 42.2°C | 8.9°C | 13 mm | 42% | 3.9 m/s | 8.7 |
| 2018 | 30.9°C | 21.9°C | 12.9°C | 38.4°C | 8.2°C | 15 mm | 49% | 3.8 m/s | 8.3 |
| 2017 | 30.2°C | 21.5°C | 12.8°C | 38.3°C | 7.3°C | 20 mm | 50% | 3.9 m/s | 8.4 |
| 2016 | 29.2°C | 20.4°C | 11.6°C | 39.6°C | 7.8°C | 35 mm | 52% | 4.1 m/s | 8.6 |
| 2015 | 29.7°C | 21.2°C | 12.7°C | 41.3°C | 7.5°C | 33 mm | 51% | 4.1 m/s | 8.3 |
| 2014 | 29.2°C | 20.4°C | 11.6°C | 41.0°C | 7.6°C | 5 mm | 52% | 4 m/s | 8.3 |
| 2013 | 31.3°C | 21.9°C | 12.6°C | 42.1°C | 8.2°C | 7 mm | 47% | 3.8 m/s | 8.3 |
| 2012 | 31.0°C | 22.3°C | 13.6°C | 40.8°C | 6.4°C | 45 mm | 53% | 3.6 m/s | 7.9 |
| 2011 🌧️ | 28.3°C | 20.7°C | 13.1°C | 37.4°C | 9.2°C | 103 mm | 62% | 4.1 m/s | 7.1 |
| 2010 | 29.2°C | 21.0°C | 12.8°C | 38.7°C | 7.2°C | 13 mm | 53% | 4.5 m/s | 7.6 |
| 2009 | 31.7°C | 22.0°C | 12.4°C | 40.6°C | 8.4°C | 2 mm | 45% | 4 m/s | 8.7 |
| 2008 | 28.3°C | 20.2°C | 12.0°C | 36.0°C | 8.5°C | 27 mm | 58% | 3.6 m/s | 8 |
| 2007 | 27.4°C | 19.5°C | 11.6°C | 41.5°C | 5.6°C | 37 mm | 55% | 4.2 m/s | 7.6 |
| 2006 | 31.5°C | 22.4°C | 13.3°C | 40.0°C | 7.6°C | 10 mm | 46% | 3.9 m/s | 8.5 |
| 2005 | 26.8°C | 18.6°C | 10.4°C | 38.7°C | 6.7°C | 8 mm | 56% | 4.5 m/s | 8.4 |
| 2004 | 32.1°C | 22.8°C | 13.5°C | 41.4°C | 7.4°C | 9 mm | 46% | 4.3 m/s | 8.7 |
| 2003 | 30.9°C | 21.6°C | 12.3°C | 41.5°C | 6.8°C | 8 mm | 51% | 4.1 m/s | 8.5 |
| 2002 | 30.9°C | 22.2°C | 13.5°C | 43.3°C | 5.6°C | 9 mm | 47% | 4.4 m/s | 7.8 |
| 2001 ❄️ | 26.1°C | 18.4°C | 10.7°C | 34.5°C | 8.2°C | 29 mm | 60% | 4.1 m/s | 7.8 |
| 2000 | 32.5°C | 22.8°C | 13.0°C | 39.1°C | 7.7°C | 2 mm | 48% | 4.2 m/s | 8.8 |
| 1999 | 30.0°C | 21.7°C | 13.3°C | 39.5°C | 8.3°C | 37 mm | 53% | 4.6 m/s | 7.9 |
| 1998 | 30.4°C | 21.8°C | 13.2°C | 38.2°C | 5.9°C | 15 mm | 52% | 4.1 m/s | 7.9 |
| 1997 | 32.1°C | 22.7°C | 13.3°C | 43.7°C | 9.7°C | 1 mm | 48% | 4.5 m/s | 8.7 |
| 1996 | 28.1°C | 19.7°C | 11.4°C | 36.5°C | 7.3°C | 10 mm | 53% | 4.3 m/s | 8.4 |
| 1995 | 27.6°C | 19.9°C | 12.2°C | 35.5°C | 8.7°C | 33 mm | 57% | 4.4 m/s | 7.3 |
| 1994 | 32.0°C | 22.7°C | 13.3°C | 39.2°C | 8.9°C | 2 mm | 44% | 4.1 m/s | 8.8 |
| 1993 | 30.8°C | 21.2°C | 11.6°C | 41.9°C | 6.8°C | 4 mm | 45% | 4.6 m/s | 8.7 |
| 1992 | 29.1°C | 20.4°C | 11.7°C | 37.0°C | 6.8°C | 9 mm | 51% | 4.1 m/s | 8.7 |
| 1991 | 31.4°C | 22.5°C | 13.7°C | 37.6°C | 8.4°C | 18 mm | 49% | 4 m/s | 8 |
| 1990 | 29.8°C | 21.1°C | 12.4°C | 35.5°C | 7.4°C | 3 mm | 50% | 3.9 m/s | 8.5 |
| 1989 | 30.0°C | 21.0°C | 11.9°C | 36.9°C | 7.7°C | 4 mm | 45% | 4.4 m/s | 8.5 |
| 1988 | 29.6°C | 20.9°C | 12.2°C | 37.4°C | 8.6°C | 16 mm | 51% | 4.3 m/s | 8.4 |
| 1987 | 30.7°C | 21.8°C | 13.0°C | 40.1°C | 6.8°C | 29 mm | 51% | 4.3 m/s | 8.3 |
| 1986 | 29.4°C | 20.3°C | 11.1°C | 37.5°C | 6.0°C | 4 mm | 48% | 4 m/s | 8.3 |
| 1985 | 28.1°C | 19.3°C | 10.6°C | 37.4°C | 7.1°C | 2 mm | 48% | 4.2 m/s | 8.4 |
| 1984 | 28.4°C | 19.6°C | 10.8°C | 37.0°C | 6.1°C | 8 mm | 49% | 3.9 m/s | 8.2 |
| 1983 | 30.0°C | 21.4°C | 12.8°C | 40.0°C | 7.2°C | 47 mm | 54% | 4.1 m/s | — |
| 1982 | 31.2°C | 22.6°C | 14.0°C | 38.4°C | 7.2°C | 9 mm | 49% | 4 m/s | — |
| 1981 | 28.5°C | 19.8°C | 11.0°C | 37.4°C | 7.5°C | 5 mm | 48% | 4.4 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 30.1°C with lows near 12.5°C (mean 21.3°C), based on 45 years of NASA POWER data.
December averages 16 mm of rainfall in Katanning, one of the drier months. The wettest on record was 103 mm in 2011.
The hottest December reached 43.7°C in 1997. The coldest dipped to 5.6°C in 2002.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.7°C. Daytime highs moved from 29.2°C to 31.2°C and overnight lows from 11.8°C to 13.3°C over the same span.
December is one of the warmer months of the year in Katanning and one of the drier months, so plan for around 30.1°C daytime highs and 12.5°C at night.
Not quite — December is the 10th coolest month in Katanning, averaging 21.3°C.
For December in Katanning, pack light, breathable clothing and sun protection, with typical highs of 30.1°C and lows of 12.5°C.
Relative humidity in December averages 50% — relatively dry.
Average wind speed in December is 4.2 m/s. The windiest December on record averaged 4.8 m/s (2023).
The wettest December on record was 2011 with 103 mm. On average, December sees 16 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 Katanning 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.
