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December Weather in Casterton, Australia

Last updated: August 22, 2025

In Casterton, Australia, the average temperature in December hovers around 17°C (63°F). However, be prepared for a range of conditions, as temperatures can dip as low as 3°C (38°F) or soar to a scorching 45°C (113°F). On average, you can expect 35 mm (1.4 in) of precipitation spread over approximately 6 days, accompanied by an average humidity level of 50%. Plan accordingly to make the most of your time in this dynamic climate!

December Temperature in Casterton

In December, in Casterton, the average temperature is 17°C (63°F). Maximum temperatures can reach 45°C (113°F), while the minimum can drop as low as 3°C (38°F). Travelers should be prepared for a wide range of temperatures during this time.

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

The chart illustrates December temperature patterns in Casterton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Casterton, December typically has an average temperature of 17°C (63°F), with highs reaching up to 45°C (113°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec686564585248474851545963
Data source: Temperature data for Casterton 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 Casterton

In Casterton in December, the total precipitation amount is 35 mm (1.4 in) spread over a period of 6 days.

December Precipitation Trends in Casterton

The chart displays monthly precipitation patterns in Casterton, 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 Casterton, December typically receives around 35 mm (1.4 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec262323376844737366635735
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Casterton

In Casterton in December humidity is 50%. With an average temperature of 17°C (63°F), this humidity feels like a refreshing stroll through a gentle spring breeze, making it an ideal time for traveling and exploring the sights comfortably.

December Average Humidity in Casterton

This chart illustrates the average monthly humidity levels in Casterton, 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 Casterton is approximately 50%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec45%49%57%67%75%79%80%75%69%59%56%50%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Casterton

In Casterton 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 Casterton, you can check here.

Maximum UV Index Levels in Casterton for December

The chart shows the monthly maximum UV Index (UVI) for Casterton 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 Casterton typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec14121174335791214
Data source: Casterton 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 Casterton Compares to Other Months

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

This table compares monthly weather conditions in Casterton, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather20°C (68°F)26 mm (1.0 inches)45%extreme
February Weather18°C (65°F)23 mm (0.9 inches)49%extreme
March Weather18°C (64°F)23 mm (0.9 inches)57%extreme
April Weather14°C (58°F)37 mm (1.5 inches)67%high
May Weather11°C (52°F)67 mm (2.7 inches)75%moderate
June Weather9°C (48°F)44 mm (1.7 inches)79%moderate
July Weather8°C (47°F)73 mm (2.9 inches)80%moderate
August Weather9°C (48°F)73 mm (2.9 inches)75%moderate
September Weather10°C (51°F)66 mm (2.6 inches)69%high
October Weather12°C (55°F)63 mm (2.5 inches)59%very high
November Weather15°C (60°F)57 mm (2.3 inches)56%extreme
December Weather17°C (63°F)35 mm (1.4 inches)50%extreme

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