Fall Weather in Ialibu Papua New Guinea

Daily high temperatures are around 67°F, rarely falling below 64°F or exceeding 70°F.

Daily low temperatures are around 55°F, rarely falling below 52°F or exceeding 57°F. The highest daily average low temperature is 55°F on April 24.

For reference, on October 26, the hottest day of the year, temperatures in Ialibu typically range from 55°F to 68°F, while on August 7, the coldest day of the year, they range from 53°F to 66°F.

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

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The fall in Ialibu experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 96% to 91%.

The clearest day of the fall is May 23, with clear, mostly clear, or partly cloudy conditions 9% of the time.

For reference, on January 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 97%, while on August 16, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 16%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Ialibu, the chance of a wet day over the course of the fall is very rapidly decreasing, starting the season at 52% and ending it at 34%.

For reference, the year's highest daily chance of a wet day is 55% on February 8, and its lowest chance is 25% on July 30.

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 fall in Ialibu is very rapidly decreasing, starting the season at 8.8 inches, when it rarely exceeds 13.7 inches or falls below 4.7 inches, and ending the season at 5.7 inches, when it rarely exceeds 10.4 inches or falls below 1.7 inches.

The highest average 31-day accumulation is 9.9 inches on April 7.

Over the course of the fall in Ialibu, the length of the day is gradually decreasing. From the start to the end of the season, the length of the day decreases by 26 minutes, implying an average daily decrease of 17 seconds, and weekly decrease of 2 minutes, 1 second.

The shortest day of the fall is May 31, with 11 hours, 47 minutes of daylight and the longest day is March 1, with 12 hours, 13 minutes of daylight.

The latest sunrise of the fall in Ialibu is 6:29 AM on March 1 and the earliest sunrise is 5 minutes earlier at 6:24 AM on April 28.

The latest sunset is 6:42 PM on March 1 and the earliest sunset is 28 minutes earlier at 6:14 PM on May 23.

Daylight saving time is not observed in Ialibu during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 6:07 AM and sets 12 hours, 29 minutes later, at 6:36 PM, while on June 20, the shortest day of the year, it rises at 6:32 AM and sets 11 hours, 46 minutes later, at 6:18 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 fall 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 Ialibu is essentially constant during the fall, remaining around 1% throughout.

The highest chance of a muggy day during the fall is 1% on May 4.

For reference, on May 4, the muggiest day of the year, there are muggy conditions 1% of the time, while on July 7, 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 Ialibu is essentially constant during the fall, remaining within 0.2 miles per hour of 2.0 miles per hour throughout.

For reference, on July 30, the windiest day of the year, the daily average wind speed is 2.4 miles per hour, while on April 23, the calmest day of the year, the daily average wind speed is 1.9 miles per hour.

The lowest daily average wind speed during the fall is 1.9 miles per hour on April 23.

The hourly average wind direction in Ialibu throughout the fall is predominantly from the south, with a peak proportion of 52% on April 9.

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 Ialibu 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 Ialibu are very rapidly increasing during the fall, increasing by 907°F, from 2,390°F to 3,298°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 Ialibu is gradually decreasing during the fall, falling by 0.8 kWh, from 4.9 kWh to 4.0 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Ialibu are -6.282 deg latitude, 143.994 deg longitude, and 6,762 ft elevation.

The topography within 2 miles of Ialibu contains significant variations in elevation, with a maximum elevation change of 705 feet and an average elevation above sea level of 6,659 feet. Within 10 miles contains significant variations in elevation (6,565 feet). Within 50 miles also contains extreme variations in elevation (14,042 feet).

The area within 2 miles of Ialibu is covered by trees (54%), shrubs (25%), and grassland (13%), within 10 miles by trees (78%) and shrubs (11%), and within 50 miles by trees (88%).