December Weather at Mount Isa Airport Australia

Daily high temperatures are around 97°F, rarely falling below 87°F or exceeding 104°F. The highest daily average high temperature is 97°F on December 9.

Daily low temperatures are around 74°F, rarely falling below 66°F or exceeding 81°F.

For reference, on December 9, the hottest day of the year, temperatures at Mount Isa Airport typically range from 74°F to 97°F, while on July 16, the coldest day of the year, they range from 49°F to 76°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Najrān, Saudi Arabia (6,981 miles away) is the far-away foreign place with temperatures most similar to Mount Isa Airport (view comparison).

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The month of December at Mount Isa Airport experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 43% to 63%.

The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 57% of the time.

For reference, on January 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 66%, while on September 11, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 85%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Mount Isa Airport, the chance of a wet day over the course of December is increasing, starting the month at 22% and ending it at 28%.

For reference, the year's highest daily chance of a wet day is 32% on February 18, and its lowest chance is 1% on August 12.

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during December at Mount Isa Airport is rapidly increasing, starting the month at 1.9 inches, when it rarely exceeds 4.0 inches or falls below 0.5 inches, and ending the month at 3.6 inches, when it rarely exceeds 8.9 inches or falls below 0.5 inches.

Over the course of December at Mount Isa Airport, the length of the day is essentially constant. The shortest day of the month is December 1, with 13 hours, 18 minutes of daylight and the longest day is December 21, with 13 hours, 23 minutes of daylight.

The earliest sunrise of the month at Mount Isa Airport is 5:52 AM on December 1 and the latest sunrise is 12 minutes later at 6:04 AM on December 31.

The earliest sunset is 7:09 PM on December 1 and the latest sunset is 16 minutes later at 7:26 PM on December 31.

Daylight saving time is not observed at Mount Isa Airport during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:58 AM and sets 13 hours, 23 minutes later, at 7:21 PM, while on June 20, the shortest day of the year, it rises at 7:17 AM and sets 10 hours, 53 minutes later, at 6:10 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for December 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy at Mount Isa Airport is rapidly increasing during December, rising from 23% to 40% over the course of the month.

For reference, on February 14, the muggiest day of the year, there are muggy conditions 51% of the time, while on July 4, the least muggy day of the year, there are muggy conditions 0% of the time.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed at Mount Isa Airport is essentially constant during December, remaining within 0.1 miles per hour of 9.4 miles per hour throughout.

For reference, on October 9, the windiest day of the year, the daily average wind speed is 10.6 miles per hour, while on February 24, the calmest day of the year, the daily average wind speed is 8.9 miles per hour.

The lowest daily average wind speed during December is 9.3 miles per hour on December 21.

The wind direction at Mount Isa Airport during December is predominantly out of the south from December 1 to December 5 and the east from December 5 to December 31.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures at Mount Isa Airport are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days at Mount Isa Airport are very rapidly increasing during December, increasing by 958°F, from 3,427°F to 4,385°F, over the course of the month.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy at Mount Isa Airport is essentially constant during December, remaining within 0.1 kWh of 7.5 kWh throughout.

For the purposes of this report, the geographical coordinates of Mount Isa Airport are -20.664 deg latitude, 139.489 deg longitude, and 1,106 ft elevation.

The topography within 2 miles of Mount Isa Airport contains only modest variations in elevation, with a maximum elevation change of 371 feet and an average elevation above sea level of 1,142 feet. Within 10 miles contains only modest variations in elevation (866 feet). Within 50 miles also contains very significant variations in elevation (1,470 feet).

The area within 2 miles of Mount Isa Airport is covered by sparse vegetation (67%) and trees (13%), within 10 miles by sparse vegetation (65%) and trees (16%), and within 50 miles by sparse vegetation (56%) and trees (28%).