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December Weather in Castle Hill, Australia

Last updated: August 22, 2025

In December, the average temperature in Castle Hill, Australia is a warm 28°C (82°F). Expect temperatures to range from a minimum of 21°C (71°F) to a sizzling maximum of 37°C (99°F). With an average humidity of 69%, the atmosphere can feel quite tropical. Be prepared for some rain, as there's an average precipitation of 127 mm (5.0 in) spread across 13 days. 🌦️

December Temperature in Castle Hill

In December in Castle Hill, the average temperature is 28°C (82°F), with maximums reaching 37°C (99°F) and minimums dropping to as low as 21°C (71°F). This climate makes it an ideal destination for travelers seeking warm weather and plenty of sunshine.

December Weather in Castle Hill: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Castle Hill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castle Hill, December typically has an average temperature of 28°C (82°F), with highs reaching up to 37°C (99°F) and lows dropping to around 21°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec818281777268687072778082
Data source: Temperature data for Castle Hill 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 Castle Hill

In Castle Hill in December, the total precipitation amount is 127 mm (5.0 in) spread over 13 days.

December Precipitation Trends in Castle Hill

The chart displays monthly precipitation patterns in Castle Hill, 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 Castle Hill, December typically receives around 127 mm (5.0 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec2902992286453211612123042127
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Castle Hill

In Castle Hill in December, humidity is 69%. With an average temperature of 28°C (82°F), this humidity feels like a warm embrace that clings to your skin, making outdoor exploration slightly more challenging but still enjoyable as you soak in the vibrant surroundings.

December Average Humidity in Castle Hill

This chart illustrates the average monthly humidity levels in Castle Hill, 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 Castle Hill is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%81%76%72%71%63%67%61%62%63%69%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Castle Hill

In Castle Hill in December, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in Castle Hill.

Maximum UV Index Levels in Castle Hill for December

The chart shows the monthly maximum UV Index (UVI) for Castle Hill 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 Castle Hill typically reaches 16, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec161614129781113141516
Data source: Castle Hill 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 Castle Hill Compares to Other Months

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

This table compares monthly weather conditions in Castle Hill, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather27°C (82°F)290 mm (11.4 inches)76%extreme
February Weather28°C (82°F)299 mm (11.8 inches)78%extreme
March Weather27°C (81°F)228 mm (9.0 inches)81%extreme
April Weather25°C (78°F)64 mm (2.5 inches)76%extreme
May Weather22°C (73°F)53 mm (2.1 inches)72%very high
June Weather20°C (68°F)21 mm (0.8 inches)71%high
July Weather20°C (68°F)16 mm (0.6 inches)63%very high
August Weather21°C (70°F)12 mm (0.5 inches)67%extreme
September Weather22°C (73°F)12 mm (0.5 inches)61%extreme
October Weather25°C (77°F)30 mm (1.2 inches)62%extreme
November Weather26°C (80°F)42 mm (1.7 inches)63%extreme
December Weather28°C (82°F)127 mm (5.0 inches)69%extreme

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