December Weather in Mount Isa, Australia

Last updated: February 25, 2025

In December, Mount Isa experiences a notable range of temperatures, with a maximum soaring up to 44°C (111°F) and a comfortable average of 32°C (90°F), while the minimum dips to 17°C (63°F) during cooler nights. This month witnesses a modest precipitation of 20 mm (0.8 in), spread across just 3 days, indicating predominantly dry conditions. With a humidity level holding steady at 47%, the climate offers a blend of heat and manageable moisture, making it an intriguing time to explore this Australian city under the brilliant summer sun.

December Temperature in Mount Isa

In December, Mount Isa experiences a noticeable transition as it embraces the height of summer, with temperatures averaging a warm 32°C (90°F). The month kicks off with a minimum temperature of 17°C (63°F), gradually rising throughout the day to a sizzling maximum of 44°C (111°F), reflecting a steady climb from the cooler months preceding it. The heat builds upon November's similarly warm average of 29°C (85°F), indicating a trend towards increasingly intense summer conditions. As the year draws to a close, December showcases the region's characteristic warmth, making it a vibrant time in Mount Isa, where long, sun-soaked days encourage outdoor activities amidst the striking Australian landscape.

December Weather in Mount Isa: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Mount Isa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec888584797064646775828590
Data source: Temperature data for Mount Isa generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Mount Isa

In Mount Isa, the December weather marks a notable shift as the region slowly emerges from an exceptionally dry spell experienced from June through November. With a recorded 20 mm (0.8 in) of precipitation over three days, December exhibits a modest increase in rainfall compared to the preceding months, where rain was scarce, especially during the mid-year dry season. This uptick, although still low relative to the wetter summer months like January and February, hints at the onset of the humid season, suggesting a transition in the climate narrative. As the year closes, the annual trend of dry conditions gradually gives way to a more vibrant, albeit still sparse, rainy season, painting a hopeful picture for upcoming months.

December Precipitation Trends in Mount Isa

The chart displays monthly precipitation patterns in Mount Isa, 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.
JanFebMarAprMayJunJulAugSepOctNovDec558587116105101820
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Mount Isa

In Mount Isa, Australia, December brings a notable shift in humidity as the year winds down. With humidity levels at 47%, December showcases a slight increase from the dry conditions of October (23%) and November (28%), marking a transition towards the more humid months. The trends throughout the year reveal a peak in humidity during March (71%) and a consistent low in September (32%). This December level aligns closely with the spring and early summer months, suggesting a gradual return to more humid conditions as the landscape prepares for the warmer season ahead. Overall, the variations in humidity underscore Mount Isa's climate dynamics, shifting from the arid peaks of mid-year to the more humid late-year atmosphere.

December Average Humidity in Mount Isa

This chart illustrates the average monthly humidity levels in Mount Isa, with December's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how December's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec56%62%71%53%47%47%42%43%33%23%28%47%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Mount Isa

In December, Mount Isa continues to experience intense sunshine, maintaining a UV Index of 16, classified as extreme, which means a burn can occur in just 10 minutes of unprotected skin exposure. This trend of elevated UV levels is consistent throughout the latter part of the year, with January through November also showcasing extreme indices, save for May and June when the levels dip slightly to very high and high respectively. The persistence of such high UV ratings underscores the importance of sun safety measures for both residents and visitors alike. For more detailed insights on UV exposure and safety, visit Mount Isa UV Index.

Maximum UV Index Levels in Mount Isa for December

The chart shows the monthly maximum UV Index (UVI) for Mount Isa 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.
JanFebMarAprMayJunJulAugSepOctNovDec171615129781113141616
Data source: Mount Isa 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.

December Sunshine in Mount Isa

December in Mount Isa, Australia, shines with an impressive 342 hours of sunlight, marking the peak of the year for bright, sunny days. This burst of daylight follows a steady increase from the earlier months, with each passing month generally showcasing more sunshine. Starting with 269 hours in January, the pattern rises consistently, particularly notable in the late spring and early summer months. From October’s 330 hours to the close of the year, December stands out as a radiant finish, representing not just the final month of the year but also a celebration of natural brilliance in this vibrant region. Such abundant sunshine in December not only enhances the beauty of Mount Isa but also invites outdoor activities and a sense of joy as the year draws to a close.

Monthly Sunshine Duration in Mount Isa: December Highlighted

The December sunshine duration represents the total number of hours Mount Isa experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec269h284h305h298h289h276h293h308h314h330h329h342h
Data source: Mount Isa December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Mount Isa During December

December in Mount Isa, Australia, presents a moderate chance of sunshine, with a 62% likelihood of clear skies. This marks a noticeable dip compared to the peak sunny months of July and August, where the chances soar to 87% and 90% respectively. As we transition from spring into summer, the trend shows a slight decrease in sunny days from November's 68%, yet still offers plenty of opportunity for basking in the sun. Overall, while December is not the sunniest month, it still holds a respectable chance for those looking to enjoy the warm Australian climate.

Percentage of Sunny Days in December in Mount Isa

The chart illustrates the percentage of sunny days in Mount Isa throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Mount Isa experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec49%56%63%83%85%65%87%91%79%70%68%62%
Data source: Mount Isa December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Mount Isa in December

In Mount Isa, Australia, December brings a delightful embrace of summer, characterized by a generous 13 hours of daylight. This reflects a continuation of the trend seen in November, where daylight reaches its peak, providing abundant time for outdoor activities and exploration. The journey to December begins with a gradual decrease in sunlight from January to April, where hours drop from 13 to 11. Following this, the daylight duration stabilizes, hovering at 10 hours during the cooler months of June and July. As spring approaches, August to October ushers in a resurgence, returning to the 12 to 13-hour range. Overall, the rhythm of daylight in Mount Isa showcases a seamless transition, allowing residents and visitors to fully bask in the vibrant atmosphere of the sun-drenched December days.

Average Daylight Hours in Mount Isa for December

The chart illustrates the variation in daylight duration in Mount Isa throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec13h 13m12h 45m12h 11m11h 35m11h 6m10h 52m10h 59m11h 24m11h 58m12h 33m13h 5m13h 21m
Data source: Mount Isa daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Mount Isa

In Mount Isa, Australia, the winds in December take a gentle turn, averaging 4.0 m/s (about 9 mph). This slight dip follows a month where wind speeds were more robust, peaking at 5.4 m/s in September. As the year progresses, a noticeable trend emerges; wind speeds typically rise from the calm of October through to May, where they consistently hover around 5.3 m/s (12 mph). The transition to December marks a softer breeze, stepping down from the year’s height, yet still providing a refreshing touch to the warm summer days. This seasonal ebb and flow of wind speed not only defines the local climate but also enhances Mount Isa's unique character, offering both tranquillity and vibrancy as the year winds down.

Average December Wind Speed in Mount Isa

The chart displays monthly wind speed patterns in Mount Isa, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.44.14.75.35.34.64.65.05.43.94.54.0 m/s
Data source: Mount Isa December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Mount Isa Compares to Other Months

The weather in Mount Isa changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of December's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Mount Isa and find detailed weather information for every month.

December and January exhibit some notable differences in weather patterns. December typically enjoys a warmer range, with minimum temperatures around 17°C (63°F) and maximums reaching up to 44°C (111°F), while January’s minimums rise to 22°C (72°F) but see a slightly cooler average of 31°C (88°F). Additionally, January experiences significantly higher precipitation, with 55 mm (2.1 in) over six days compared to December’s 20 mm (0.8 in) over three days, leading to increased humidity levels of 56% in January versus 47% in December. For a more detailed look at January's weather, you can check Mount Isa weather in January.

In December, the weather in Mount Isa is characterized by warmer temperatures, with a minimum of 17°C (63°F) and a maximum of 44°C (111°F), leading to an average of 32°C (90°F). The month sees relatively low precipitation levels at 20 mm (0.8 in) over just three days, and humidity stays around 47%.

In contrast, February brings slightly cooler temperatures, with the minimum increasing to 18°C (65°F) and the maximum dipping to 42°C (107°F), averaging at 30°C (86°F). However, February experiences significantly higher rainfall, totaling 85 mm (3.4 in) over six days, and humidity rises to 62%. For more details on the weather specifics, check out Mount Isa weather in February.

December and March exhibit distinct weather patterns in terms of temperature and precipitation. In December, temperatures range from a minimum of 17°C (63°F) to a maximum of 44°C (111°F), with an average of 32°C (90°F) and relatively low humidity at 47%. Precipitation is minimal, totaling 20 mm (0.8 in) over just three days. In contrast, March shows slightly milder temperatures, with a minimum of 18°C (66°F), an average of 29°C (85°F), and a maximum of 41°C (106°F). However, it experiences significantly higher humidity at 71% and substantially more rainfall, accumulating 87 mm (3.4 in) over six days. This makes March a wetter and more humid month compared to the dry heat of December. For more details, you can check out Mount Isa weather in March.

In December, the weather tends to be much hotter, with average temperatures ranging from a minimum of 17°C (63°F) to a maximum of 44°C (111°F). The month also sees about 20 mm (0.8 in) of precipitation over three days, resulting in a humidity level of 47%. In contrast, April is significantly cooler, with temperatures ranging from a minimum of 11°C (51°F) to a maximum of 37°C (99°F). Notably, April experiences almost no rain, with only 1 mm (0.0 in) of precipitation over the entire month and no rainy days, contributing to a slightly higher humidity of 53%. For a closer look at the April climate, you can check Mount Isa weather in April.

In December, the weather is significantly hotter, with minimum temperatures around 17°C (63°F) and maximums reaching up to 44°C (111°F), creating an average of 32°C (90°F). The month experiences light precipitation of 20 mm (0.8 in) over approximately three days, while maintaining a consistent humidity level of 47%. In contrast, May brings much cooler conditions, with minimum temperatures dipping to 6°C (43°F) and averaging 21°C (70°F), peaking at a maximum of 32°C (91°F). This month is notably drier, with only 1 mm (0.0 in) of rain and no precipitation days recorded. For more details on the pleasant weather patterns typical of this time in Mount Isa, visit Mount Isa weather in May.

In December, temperatures in Mount Isa soar from a minimum of 17°C (63°F) to a blistering maximum of 44°C (111°F), with an average of 32°C (90°F). The month experiences a light rainfall of 20 mm (0.8 in) over just three days, accompanied by a steady humidity of 47%. In contrast, June presents a much cooler climate, with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 31°C (89°F) and an average of 18°C (64°F). Notably, June sees minimal precipitation of only 6 mm (0.2 in), and no rainy days, while humidity remains consistent at 47%. For more details, check out Mount Isa weather in June.

When comparing the weather in December and July, there’s a stark contrast in temperature and precipitation patterns. December boasts a much warmer climate with temperatures ranging from a minimum of 17°C (63°F) to a scorching maximum of 44°C (111°F), while July sees cooler temperatures, with a minimum of 4°C (40°F) and a maximum of 33°C (91°F). December also experiences more precipitation, averaging 20 mm (0.8 in) over three days, compared to July's minimal 1 mm (0.1 in) with no rainy days at all. Additionally, humidity levels are slightly higher in December at 47%, compared to 42% in July. For those looking for more detailed information, you can check Mount Isa weather in July.

Comparing the weather of December and August reveals contrasting conditions. In December, temperatures range from a minimum of 17°C (63°F) to a maximum of 44°C (111°F), with an average of 32°C (90°F). This month also sees some precipitation, averaging 20 mm over three days, and humidity levels are relatively high at 47%. In stark contrast, August offers cooler weather, with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 34°C (94°F), and an average of 20°C (68°F). Notably, August experiences no rainfall, leading to a dry environment with a slight decrease in humidity at 43%. For more details, check out Mount Isa weather in August.

In comparing the weather between December and September, December showcases significantly higher temperatures, with minimums reaching 17°C (63°F) and maximums soaring to 44°C (111°F). The average temperature in December is a sweltering 32°C (90°F), accompanied by higher humidity levels at 47%. In contrast, September is much cooler, with temperatures ranging from a minimum of 9°C (48°F) to a maximum of 39°C (102°F) and an average of 24°C (75°F). Precipitation is also less in September, with only 5 mm (0.2 in) recorded over just one day, compared to December's 20 mm (0.8 in) over three days. For more information, you can check Mount Isa weather in September.

When comparing the weather in December and October, December experiences notably higher temperatures, with an average of 32°C (90°F) and maximums reaching up to 44°C (111°F), while October holds a cooler average of 28°C (83°F) and a maximum of 41°C (105°F). Additionally, December sees a slight increase in precipitation, with 20 mm (0.8 in) over 3 days compared to October's 10 mm (0.4 in) over 2 days. Humidity levels also differ, with December at 47%, significantly higher than October’s 23%, making October a more comfortable month overall. For more detailed insights, you can check Mount Isa weather in October.

In December, the weather in Mount Isa is notably warmer compared to November, with average temperatures rising from 29°C (85°F) in November to 32°C (90°F). The maximum temperatures also peak higher, reaching 44°C (111°F) in December, compared to 41°C (107°F) in November. However, December experiences slightly more precipitation, averaging 20 mm (0.8 in) over 3 days, while November sees 18 mm (0.7 in) over 4 days. Additionally, humidity levels in December are higher at 47%, compared to a more arid 28% in November, indicating a shift towards a more humid atmosphere as the year ends. For more details, check out Mount Isa weather in November.

Compare Mount Isa's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Mount Isa

December in Mount Isa is a scorching month that stands in stark contrast to the cooler months of the year. With maximum temperatures soaring to a sweltering 44°C (111°F) and an average of 32°C (90°F), it's a time when the sun truly reigns. Unlike the rest of the year, December experiences minimal rainfall, with only a few precious days of precipitation, leading to a low humidity level that further intensifies the heat. If you're planning a visit, be prepared for the dry and hot conditions that define this dynamic summer month. For more detailed insights on the year-round climate, check out Mount Isa Climate.