September Weather at Pilar Observatorio Argentina

Daily high temperatures increase by 4°F, from 70°F to 73°F, rarely falling below 58°F or exceeding 85°F.

Daily low temperatures increase by 5°F, from 47°F to 52°F, rarely falling below 36°F or exceeding 60°F.

For reference, on January 8, the hottest day of the year, temperatures at Pilar Observatorio typically range from 66°F to 86°F, while on July 18, the coldest day of the year, they range from 41°F to 62°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. 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.

Maitland, Australia (7,430 miles away) and Kingaroy, Australia (7,786 miles) are the far-away foreign places with temperatures most similar to Pilar Observatorio (view comparison).

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The month of September at Pilar Observatorio experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 26% throughout the month.

The clearest day of the month is September 17, with clear, mostly clear, or partly cloudy conditions 74% of the time.

For reference, on May 31, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 40%, while on March 14, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 79%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Pilar Observatorio, the chance of a wet day over the course of September is very rapidly increasing, starting the month at 8% and ending it at 16%.

For reference, the year's highest daily chance of a wet day is 42% on January 1, and its lowest chance is 3% on August 8.

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 September at Pilar Observatorio is rapidly increasing, starting the month at 0.8 inches, when it rarely exceeds 2.2 inches, and ending the month at 1.8 inches, when it rarely exceeds 3.4 inches or falls below 0.4 inches.

Over the course of September at Pilar Observatorio, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 55 minutes, implying an average daily increase of 1 minute, 54 seconds, and weekly increase of 13 minutes, 16 seconds.

The shortest day of the month is September 1, with 11 hours, 28 minutes of daylight and the longest day is September 30, with 12 hours, 23 minutes of daylight.

The latest sunrise of the month at Pilar Observatorio is 7:31 AM on September 1 and the earliest sunrise is 37 minutes earlier at 6:53 AM on September 30.

The earliest sunset is 6:59 PM on September 1 and the latest sunset is 17 minutes later at 7:17 PM on September 30.

Daylight saving time is not observed at Pilar Observatorio during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 6:07 AM and sets 14 hours, 13 minutes later, at 8:20 PM, while on June 20, the shortest day of the year, it rises at 8:14 AM and sets 10 hours, 5 minutes later, at 6:19 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 September 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 Pilar Observatorio is essentially constant during September, remaining within 1% of 1% throughout.

For reference, on January 19, the muggiest day of the year, there are muggy conditions 43% of the time, while on July 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 at Pilar Observatorio is essentially constant during September, remaining within 0.1 miles per hour of 6.1 miles per hour throughout.

For reference, on September 20, the windiest day of the year, the daily average wind speed is 6.2 miles per hour, while on March 6, the calmest day of the year, the daily average wind speed is 4.4 miles per hour.

The highest daily average wind speed during September is 6.2 miles per hour on September 30.

The hourly average wind direction at Pilar Observatorio throughout September is predominantly from the north, with a peak proportion of 41% on September 2.

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).

The growing season at Pilar Observatorio typically lasts for 9.9 months (302 days), from around August 17 to around June 15, rarely starting before July 18 or after September 15, and rarely ending before May 18 or after July 12.

The month of September at Pilar Observatorio is very likely fully outside of the growing season, with the chance that a given day is in the growing season rapidly increasing from 74% to 99% over the course of the month.

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 Pilar Observatorio are increasing during September, increasing by 298°F, from 358°F to 656°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 Pilar Observatorio is increasing during September, rising by 1.1 kWh, from 5.0 kWh to 6.1 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Pilar Observatorio are -31.667 deg latitude, -63.883 deg longitude, and 1,089 ft elevation.

The topography within 2 miles of Pilar Observatorio contains only modest variations in elevation, with a maximum elevation change of 118 feet and an average elevation above sea level of 1,094 feet. Within 10 miles also contains only modest variations in elevation (322 feet). Within 50 miles contains only modest variations in elevation (6,188 feet).

The area within 2 miles of Pilar Observatorio is covered by cropland (74%), within 10 miles by cropland (88%), and within 50 miles by cropland (74%) and shrubs (11%).