Spring Weather in Mount Isa Australia

Daily high temperatures increase by 13°F, from 84°F to 97°F, rarely falling below 75°F or exceeding 104°F.

Daily low temperatures increase by 17°F, from 56°F to 73°F, rarely falling below 46°F or exceeding 80°F.

For reference, on December 8, the hottest day of the year, temperatures in Mount Isa typically range from 74°F to 97°F, while on July 16, the coldest day of the year, they range from 49°F to 75°F.

The figure below shows you a compact characterization of the hourly average spring temperatures. 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.

San Buenaventura, Mexico (8,601 miles away) and Najrān, Saudi Arabia (6,982 miles) are the far-away foreign places with temperatures most similar to Mount Isa (view comparison).

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The spring in Mount Isa experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 16% to 42%. The lowest chance of overcast or mostly cloudy conditions is 15% on September 11.

The clearest day of the spring is September 11, with clear, mostly clear, or partly cloudy conditions 85% 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. In Mount Isa, the chance of a wet day over the course of the spring is very rapidly increasing, starting the season at 3% and ending it at 21%.

For reference, the year's highest daily chance of a wet day is 31% on February 18, and its lowest chance is 1% on August 10.

Rainfall

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

The average sliding 31-day rainfall during the spring in Mount Isa is rapidly increasing, starting the season at 0.1 inches, when it rarely exceeds 0.6 inches or falls below -0.0 inches, and ending the season at 1.9 inches, when it rarely exceeds 3.8 inches or falls below 0.5 inches.

Over the course of the spring in Mount Isa, the length of the day is rapidly increasing. From the start to the end of the season, the length of the day increases by 1 hour, 35 minutes, implying an average daily increase of 1 minute, 3 seconds, and weekly increase of 7 minutes, 23 seconds.

The shortest day of the spring is September 1, with 11 hours, 42 minutes of daylight and the longest day is November 30, with 13 hours, 17 minutes of daylight.

The latest sunrise of the spring in Mount Isa is 6:50 AM on September 1 and the earliest sunrise is 59 minutes earlier at 5:52 AM on November 27.

The earliest sunset is 6:33 PM on September 1 and the latest sunset is 36 minutes later at 7:09 PM on November 30.

Daylight saving time is not observed in Mount Isa during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:58 AM and sets 13 hours, 24 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, 52 minutes later, at 6:09 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 the spring of 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 in Mount Isa is very rapidly increasing during the spring, rising from 0% to 22% over the course of the season.

For reference, on February 14, the muggiest day of the year, there are muggy conditions 50% of the time, while on June 16, 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 in Mount Isa is gradually decreasing during the spring, decreasing from 10.5 miles per hour to 9.6 miles per hour over the course of the season.

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 9.0 miles per hour.

The highest daily average wind speed during the spring is 10.6 miles per hour on October 9.

The wind direction in Mount Isa during the spring is predominantly out of the south from September 1 to September 22 and from October 4 to November 30 and the east from September 22 to October 4.

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 in Mount Isa 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 in Mount Isa are very rapidly increasing during the spring, increasing by 2,452°F, from 904°F to 3,357°F, over the course of the season.

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 in Mount Isa is increasing during the spring, rising by 1.3 kWh, from 6.4 kWh to 7.7 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the spring is 7.7 kWh on November 3.

For the purposes of this report, the geographical coordinates of Mount Isa are -20.725 deg latitude, 139.497 deg longitude, and 1,191 ft elevation.

The topography within 2 miles of Mount Isa contains significant variations in elevation, with a maximum elevation change of 577 feet and an average elevation above sea level of 1,204 feet. Within 10 miles contains significant variations in elevation (896 feet). Within 50 miles also contains very significant variations in elevation (1,427 feet).

The area within 2 miles of Mount Isa is covered by artificial surfaces (40%), sparse vegetation (36%), and trees (20%), within 10 miles by sparse vegetation (70%) and shrubs (14%), and within 50 miles by sparse vegetation (57%) and trees (26%).