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December Weather in Whyalla, Australia

Last updated: August 22, 2025

In December, the average temperature in Whyalla, Australia hovers around 23°C (74°F). However, be prepared for a range—it can drop to as low as 10°C (51°F) or soar up to a sizzling 48°C (118°F). During this time, expect about 17 mm (0.7 in) of precipitation spread over approximately 3 days, while the average humidity remains relatively low at 38%.

December Temperature in Whyalla

In December in Whyalla, the average temperature is 23°C (74°F), with maximums reaching up to 48°C (118°F) and minimums dropping as low as 10°C (51°F). Be prepared for a wide range of temperatures, making it essential to pack both light clothing for the heat and warmer layers for cooler evenings.

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

The chart illustrates December temperature patterns in Whyalla, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Whyalla, December typically has an average temperature of 23°C (74°F), with highs reaching up to 48°C (118°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec777473675853535460656974
Data source: Temperature data for Whyalla 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 Whyalla

In Whyalla in December, the precipitation amount is 17 mm (0.7 in) over the course of 3 days.

December Precipitation Trends in Whyalla

The chart displays monthly precipitation patterns in Whyalla, 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 Whyalla, December typically receives around 17 mm (0.7 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec16196181621162414223817
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Whyalla

In Whyalla in December, humidity is 38%. With an average temperature of 23°C (74°F), this humidity feels like a pleasant, refreshing embrace, making it comfortable for traveling, where you can explore the sights without feeling too sticky or weighed down by the heat.

December Average Humidity in Whyalla

This chart illustrates the average monthly humidity levels in Whyalla, 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 Whyalla is approximately 38%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec31%36%47%58%66%70%70%63%53%39%42%38%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Whyalla

In Whyalla in December, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in Whyalla.

Maximum UV Index Levels in Whyalla for December

The chart shows the monthly maximum UV Index (UVI) for Whyalla 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 Whyalla typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec151412964468111315
Data source: Whyalla 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 Whyalla Compares to Other Months

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

This table compares monthly weather conditions in Whyalla, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (77°F)16 mm (0.6 inches)31%extreme
February Weather24°C (75°F)19 mm (0.7 inches)36%extreme
March Weather23°C (73°F)6 mm (0.3 inches)47%extreme
April Weather19°C (67°F)18 mm (0.7 inches)58%very high
May Weather15°C (59°F)16 mm (0.6 inches)66%high
June Weather12°C (53°F)21 mm (0.8 inches)70%moderate
July Weather12°C (53°F)16 mm (0.6 inches)70%moderate
August Weather12°C (55°F)23 mm (0.9 inches)63%high
September Weather16°C (61°F)14 mm (0.6 inches)53%very high
October Weather19°C (66°F)21 mm (0.8 inches)39%extreme
November Weather21°C (70°F)38 mm (1.5 inches)42%extreme
December Weather23°C (74°F)17 mm (0.7 inches)38%extreme

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