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December Weather in Killara, Australia

Last updated: August 22, 2025

In December, the average temperature in Killara, Australia is a pleasant 21°C (69°F), with a range that can dip to a cool 6°C (44°F) or soar to a sizzling 39°C (103°F). Expect an average precipitation of 73 mm (2.9 in) spread across 6 days, contributing to an overall humidity of 51%. Enjoy the variety that this season brings!

December Temperature in Killara

In December in Killara, the average temperature is 21°C (69°F). Maximums can reach 39°C (103°F), and minimums can be as low as 6°C (44°F). Be prepared for a wide range of temperatures while planning your travels.

December Weather in Killara: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Killara, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Killara, December typically has an average temperature of 21°C (69°F), with highs reaching up to 39°C (103°F) and lows dropping to around 6°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec747066585044444550576369
Data source: Temperature data for Killara generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Killara

In Killara in December, the precipitation amount is 73 mm (2.9 in) over a span of 6 days.

December Precipitation Trends in Killara

The chart displays monthly precipitation patterns in Killara, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Killara, December typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec443662618374859065858573
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Killara

In Killara in December humidity is 51%. With an average temperature of 21°C (69°F), this humidity feels like a comfortable yet slightly sticky embrace, making it perfect for leisurely sightseeing but potentially requiring light, breathable clothing to stay cool during outdoor excursions.

December Average Humidity in Killara

This chart illustrates the average monthly humidity levels in Killara, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Killara is approximately 51%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec45%52%61%72%79%82%84%80%73%60%58%51%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Killara

In Killara in December, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Killara, you can check here.

Maximum UV Index Levels in Killara for December

The chart shows the monthly maximum UV Index (UVI) for Killara in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Killara typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec14121175335891214
Data source: Killara December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Killara Compares to Other Months

Weather in Killara varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Killara, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Killara, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (75°F)44 mm (1.7 inches)45%extreme
February Weather21°C (71°F)36 mm (1.4 inches)52%extreme
March Weather19°C (67°F)62 mm (2.4 inches)61%extreme
April Weather15°C (58°F)61 mm (2.4 inches)72%high
May Weather10°C (50°F)83 mm (3.3 inches)79%moderate
June Weather7°C (44°F)73 mm (2.9 inches)82%moderate
July Weather7°C (44°F)85 mm (3.3 inches)84%moderate
August Weather7°C (45°F)90 mm (3.5 inches)80%moderate
September Weather10°C (50°F)65 mm (2.6 inches)73%very high
October Weather14°C (57°F)85 mm (3.4 inches)60%very high
November Weather17°C (63°F)85 mm (3.3 inches)58%extreme
December Weather21°C (69°F)73 mm (2.9 inches)51%extreme

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