December is one of the warmer months of the year in Cooma, with average highs near 24.4°C and lows around 10.3°C (mean 17.4°C). It is a relatively wet time of year, averaging 74 mm of rainfall and 64% relative humidity across the period.
December is one of the warmer months of the year in Cooma. Across 45 years of records, the warmest December in Cooma was 2019 — when the month averaged 20.6°C — while the coldest was 1991 at 14.8°C. Typical December days reach 24.4°C with nights near 10.3°C. The long-term trend is warming, about 0.4°C per decade.
December is a relatively wet time of year in Cooma, averaging 74 mm of rainfall. The wettest December on record was 2014 with 197 mm, while the driest was 2019 at 7 mm.
Relative humidity in Cooma during December averages 64%. The most humid December was 1992 at 81%, and the least humid was 2019 at 46%.
December receives about 6.7 kWh/m²/day of solar energy in Cooma. The sunniest December was 2005 at 7.7 kWh/m²/day, and the cloudiest was 1992 at 5.8.
Average wind speed in Cooma during December is 1 m/s. The windiest December was 1984 at 1.4 m/s, while the calmest was 2011 at 0.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.4°C | 17.0°C | 17.8°C | 18.3°C | 17.2°C | +0.8°C |
| Avg High | 23.1°C | 24.0°C | 25.3°C | 25.3°C | 24.1°C | +1°C |
| Avg Low | 9.7°C | 10.0°C | 10.4°C | 11.2°C | 10.4°C | +0.7°C |
| Avg Rain | 72 mm | 82 mm | 60 mm | 80 mm | 75 mm | +4 mm |
December temperatures in Cooma have risen by about 1°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 1.3°C (1987) to a record high of 37.1°C (2019).
Rainfall in December is a relatively wet time of year, averaging 74 mm, with a wettest year of 197 mm.
One of the best times to visit Cooma
December is one of the best times to visit Cooma. Expect days averaging 24.4°C and nights around 10.3°C (mean 17.4°C) — warmer than Cooma's yearly average — with moderate rainfall (74 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 | 26.6°C | 18.4°C | 10.2°C | 36.6°C | 3.2°C | 24 mm | 53% | 1.1 m/s | — |
| 2024 | 28.0°C | 20.0°C | 12.1°C | 35.8°C | 5.7°C | 28 mm | 57% | 1 m/s | 7.4 |
| 2023 | 23.4°C | 17.6°C | 11.9°C | 30.6°C | 7.2°C | 143 mm | 75% | 0.9 m/s | 6 |
| 2022 | 21.4°C | 14.9°C | 8.5°C | 30.5°C | 1.8°C | 49 mm | 68% | 1 m/s | 6.7 |
| 2021 | 22.1°C | 16.0°C | 10.0°C | 27.9°C | 6.5°C | 114 mm | 76% | 0.9 m/s | 6.2 |
| 2020 | 23.2°C | 16.4°C | 9.6°C | 33.0°C | 4.6°C | 94 mm | 68% | 1.1 m/s | 6.6 |
| 2019 🔥 | 29.4°C | 20.6°C | 11.8°C | 37.1°C | 4.5°C | 7 mm | 46% | 1.1 m/s | 7.4 |
| 2018 | 27.7°C | 20.3°C | 12.9°C | 35.5°C | 5.8°C | 87 mm | 60% | 0.9 m/s | 6.5 |
| 2017 | 25.6°C | 19.0°C | 12.3°C | 34.2°C | 8.3°C | 107 mm | 67% | 1 m/s | 5.9 |
| 2016 | 26.8°C | 19.5°C | 12.2°C | 32.0°C | 6.0°C | 73 mm | 61% | 1.1 m/s | 6.3 |
| 2015 | 27.0°C | 19.2°C | 11.3°C | 34.8°C | 4.5°C | 31 mm | 57% | 1 m/s | 7.3 |
| 2014 🌧️ | 23.2°C | 17.3°C | 11.3°C | 27.7°C | 7.3°C | 197 mm | 72% | 0.9 m/s | 6.6 |
| 2013 | 26.0°C | 18.3°C | 10.6°C | 35.1°C | 4.2°C | 42 mm | 60% | 1 m/s | 6.9 |
| 2012 | 24.7°C | 17.5°C | 10.3°C | 30.3°C | 2.7°C | 37 mm | 63% | 1 m/s | 6.7 |
| 2011 | 20.9°C | 15.0°C | 9.1°C | 26.4°C | 2.3°C | 65 mm | 74% | 0.7 m/s | 6.5 |
| 2010 | 21.6°C | 15.9°C | 10.2°C | 30.3°C | 3.0°C | 154 mm | 76% | 1.1 m/s | 6.5 |
| 2009 | 27.2°C | 19.0°C | 10.8°C | 35.6°C | 6.1°C | 66 mm | 57% | 1 m/s | 7.2 |
| 2008 | 23.2°C | 16.3°C | 9.4°C | 30.1°C | 3.4°C | 71 mm | 61% | 1.2 m/s | 6.3 |
| 2007 | 23.5°C | 17.1°C | 10.8°C | 34.1°C | 5.8°C | 95 mm | 70% | 0.9 m/s | 6.3 |
| 2006 | 26.0°C | 18.0°C | 10.1°C | 35.0°C | 3.2°C | 39 mm | 57% | 1.1 m/s | 6.4 |
| 2005 | 26.3°C | 18.3°C | 10.3°C | 37.0°C | 6.2°C | 26 mm | 53% | 1.2 m/s | 7.7 |
| 2004 | 23.2°C | 16.6°C | 9.9°C | 31.0°C | 3.4°C | 129 mm | 68% | 1 m/s | 6.5 |
| 2003 | 26.3°C | 18.9°C | 11.6°C | 33.5°C | 6.0°C | 77 mm | 64% | 0.9 m/s | 7.1 |
| 2002 | 26.8°C | 18.6°C | 10.4°C | 36.3°C | 2.4°C | 30 mm | 56% | 1.1 m/s | 7.1 |
| 2001 | 24.4°C | 17.0°C | 9.6°C | 31.9°C | 2.7°C | 32 mm | 58% | 1.1 m/s | 6.2 |
| 2000 | 26.1°C | 18.6°C | 11.1°C | 32.3°C | 4.0°C | 31 mm | 59% | 1 m/s | 7.4 |
| 1999 | 23.2°C | 16.6°C | 10.1°C | 30.5°C | 2.0°C | 108 mm | 67% | 1 m/s | 6.4 |
| 1998 | 24.8°C | 17.8°C | 10.7°C | 32.9°C | 5.6°C | 60 mm | 67% | 0.9 m/s | 6.8 |
| 1997 | 27.0°C | 19.1°C | 11.1°C | 33.6°C | 6.0°C | 42 mm | 56% | 1.1 m/s | 7.2 |
| 1996 | 23.9°C | 16.5°C | 9.1°C | 31.0°C | 4.3°C | 63 mm | 61% | 1.1 m/s | 6.5 |
| 1995 | 21.8°C | 14.9°C | 8.0°C | 29.2°C | 1.9°C | 95 mm | 67% | 1 m/s | 6.8 |
| 1994 | 26.8°C | 18.9°C | 10.9°C | 35.2°C | 4.6°C | 65 mm | 60% | 0.9 m/s | 7.6 |
| 1993 | 23.9°C | 16.9°C | 9.9°C | 32.1°C | 5.0°C | 45 mm | 64% | 1.2 m/s | 6.4 |
| 1992 | 20.0°C | 15.0°C | 10.1°C | 25.8°C | 4.8°C | 169 mm | 81% | 0.9 m/s | 5.8 |
| 1991 ❄️ | 21.1°C | 14.8°C | 8.6°C | 31.1°C | 3.3°C | 143 mm | 71% | 1 m/s | 6.2 |
| 1990 | 27.8°C | 19.4°C | 11.0°C | 33.2°C | 4.1°C | 27 mm | 54% | 1.1 m/s | 7.1 |
| 1989 | 22.5°C | 16.0°C | 9.5°C | 30.4°C | 2.5°C | 65 mm | 68% | 1 m/s | 7 |
| 1988 | 22.7°C | 17.0°C | 11.3°C | 28.7°C | 5.5°C | 145 mm | 78% | 0.8 m/s | 6.2 |
| 1987 | 24.4°C | 16.8°C | 9.3°C | 33.0°C | 1.3°C | 75 mm | 61% | 1 m/s | 6.7 |
| 1986 | 22.6°C | 15.7°C | 8.7°C | 29.3°C | 4.3°C | 52 mm | 64% | 1.1 m/s | 7 |
| 1985 | 20.7°C | 15.1°C | 9.5°C | 25.9°C | 5.9°C | 67 mm | 72% | 1.1 m/s | 6.2 |
| 1984 | 22.2°C | 15.1°C | 8.1°C | 32.6°C | 3.6°C | 46 mm | 58% | 1.4 m/s | 6.7 |
| 1983 | 22.6°C | 16.3°C | 10.0°C | 30.2°C | 3.4°C | 74 mm | 72% | 0.9 m/s | — |
| 1982 | 26.5°C | 18.5°C | 10.5°C | 34.5°C | 5.1°C | 33 mm | 55% | 1 m/s | — |
| 1981 | 24.0°C | 17.0°C | 10.1°C | 31.0°C | 5.1°C | 90 mm | 62% | 1.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 24.4°C with lows near 10.3°C (mean 17.4°C), based on 45 years of NASA POWER data.
December averages 74 mm of rainfall in Cooma, a relatively wet time of year. The wettest on record was 197 mm in 2014.
The hottest December reached 37.1°C in 2019. The coldest dipped to 1.3°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1°C. Daytime highs moved from 23.2°C to 24.3°C and overnight lows from 9.6°C to 10.5°C over the same span.
December is one of the warmer months of the year in Cooma and a relatively wet time of year, so plan for around 24.4°C daytime highs and 10.3°C at night.
Not quite — December is the 10th coolest month in Cooma, averaging 17.4°C.
For December in Cooma, pack light layers you can adjust through the day, with typical highs of 24.4°C and lows of 10.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 64% — moderately humid.
Average wind speed in December is 1 m/s. The windiest December on record averaged 1.4 m/s (1984).
The wettest December on record was 2014 with 197 mm. On average, December sees 74 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 Cooma 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.
