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December Weather in Saint Marys, Australia

Last updated: August 22, 2025

In Saint Marys, Australia, the average temperature for December hovers around 15°C (59°F). Expect a comfortable range with minimums dipping to 8°C (46°F) and maximums reaching up to 25°C (77°F). This month typically sees about 95 mm (3.7 in) of precipitation spread over 10 days, accompanied by an average humidity of 76%. Stay prepared for a mix of sun and rain!

December Temperature in Saint Marys

In December in Saint Marys, the average temperature is 15°C (59°F). Maximums can reach 25°C (77°F), while minimums can drop as low as 8°C (46°F). This makes it an ideal time for travelers to enjoy a comfortable mix of warm days and cooler evenings.

December Weather in Saint Marys: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Saint Marys, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Marys, December typically has an average temperature of 15°C (59°F), with highs reaching up to 25°C (77°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec636161585552505051535659
Data source: Temperature data for Saint Marys 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 Saint Marys

In Saint Marys in December, the total precipitation amount is 95 mm (3.7 in) over the course of 10 days.

December Precipitation Trends in Saint Marys

The chart displays monthly precipitation patterns in Saint Marys, 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 Saint Marys, December typically receives around 95 mm (3.7 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec647786384459324753926295
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Saint Marys

In Saint Marys in December humidity is 76%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities less enjoyable and often leading to a quick sense of fatigue while traveling.

December Average Humidity in Saint Marys

This chart illustrates the average monthly humidity levels in Saint Marys, 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 Saint Marys is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%74%76%75%78%77%79%79%77%75%76%77%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Saint Marys

In Saint Marys in December, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Saint Marys.

Maximum UV Index Levels in Saint Marys for December

The chart shows the monthly maximum UV Index (UVI) for Saint Marys 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 Saint Marys typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec1311963224681013
Data source: Saint Marys 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 Saint Marys Compares to Other Months

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

This table compares monthly weather conditions in Saint Marys, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (63°F)64 mm (2.5 inches)76%extreme
February Weather16°C (62°F)77 mm (3.0 inches)74%extreme
March Weather16°C (61°F)86 mm (3.4 inches)76%very high
April Weather14°C (58°F)38 mm (1.5 inches)75%high
May Weather13°C (55°F)43 mm (1.7 inches)78%moderate
June Weather11°C (52°F)59 mm (2.3 inches)77%low
July Weather10°C (50°F)32 mm (1.3 inches)79%low
August Weather10°C (50°F)47 mm (1.8 inches)78%moderate
September Weather11°C (51°F)53 mm (2.1 inches)77%high
October Weather12°C (54°F)92 mm (3.6 inches)75%very high
November Weather13°C (56°F)62 mm (2.5 inches)76%very high
December Weather15°C (59°F)95 mm (3.7 inches)76%extreme

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