Summer Weather in San Isidro Argentina

Daily high temperatures are around 82°F, rarely falling below 72°F or exceeding 91°F. The highest daily average high temperature is 84°F on January 15.

Daily low temperatures are around 66°F, rarely falling below 57°F or exceeding 75°F. The highest daily average low temperature is 69°F on January 15.

For reference, on January 14, the hottest day of the year, temperatures in San Isidro typically range from 69°F to 84°F, while on July 18, the coldest day of the year, they range from 45°F to 58°F.

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

Mazagón, Spain (5,966 miles away) and Roselands, Australia (7,345 miles) are the far-away foreign places with temperatures most similar to San Isidro (view comparison).

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The summer in San Isidro experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 30% throughout the season. The lowest chance of overcast or mostly cloudy conditions is 29% on January 14.

The clearest day of the summer is January 14, with clear, mostly clear, or partly cloudy conditions 71% of the time.

For reference, on May 31, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 52%, while on January 14, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In San Isidro, the chance of a wet day over the course of the summer is gradually decreasing, starting the season at 31% and ending it at 29%.

For reference, the year's highest daily chance of a wet day is 36% on February 8, and its lowest chance is 17% on August 11.

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 summer in San Isidro is increasing, starting the season at 3.9 inches, when it rarely exceeds 7.4 inches or falls below 1.5 inches, and ending the season at 4.5 inches, when it rarely exceeds 8.3 inches or falls below 1.6 inches.

The highest average 31-day accumulation is 4.8 inches on February 7. The lowest average 31-day accumulation is 3.6 inches on December 31.

Over the course of the summer in San Isidro, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 27 minutes, implying an average daily decrease of 59 seconds, and weekly decrease of 6 minutes, 51 seconds.

The shortest day of the summer is February 28, with 12 hours, 51 minutes of daylight and the longest day is December 21, with 14 hours, 28 minutes of daylight.

The earliest sunrise of the summer in San Isidro is 5:34 AM on December 5 and the latest sunrise is 1 hour, 7 minutes later at 6:40 AM on February 28.

The latest sunset is 8:10 PM on January 6 and the earliest sunset is 39 minutes earlier at 7:31 PM on February 28.

Daylight saving time is not observed in San Isidro during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:38 AM and sets 14 hours, 28 minutes later, at 8:06 PM, while on June 20, the shortest day of the year, it rises at 8:00 AM and sets 9 hours, 51 minutes later, at 5:51 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 summer 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 San Isidro is very rapidly increasing during the summer, rising from 21% to 50% over the course of the season.

The highest chance of a muggy day during the summer is 53% on February 8.

For reference, on February 7, the muggiest day of the year, there are muggy conditions 53% of the time, while on July 17, 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 San Isidro is gradually decreasing during the summer, decreasing from 10.4 miles per hour to 9.6 miles per hour over the course of the season.

For reference, on September 12, the windiest day of the year, the daily average wind speed is 11.1 miles per hour, while on May 5, the calmest day of the year, the daily average wind speed is 9.5 miles per hour.

The hourly average wind direction in San Isidro throughout the summer is predominantly from the east, with a peak proportion of 45% on January 10.

San Isidro is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in San Isidro is increasing during the summer, rising by 4°F, from 71°F to 75°F, over the course of the season.

The highest average surface water temperature during the summer is 76°F on February 1.

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).

While it does not do so every year, freezing temperatures are seen in San Isidro over some winters. The day least likely to be in the growing season is July 15, with a 57% chance.

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 San Isidro are very rapidly increasing during the summer, increasing by 2,163°F, from 1,542°F to 3,704°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 San Isidro is decreasing during the summer, falling by 1.3 kWh, from 7.6 kWh to 6.3 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the summer is 7.8 kWh on December 31.

For the purposes of this report, the geographical coordinates of San Isidro are -34.472 deg latitude, -58.527 deg longitude, and 69 ft elevation.

The topography within 2 miles of San Isidro contains only modest variations in elevation, with a maximum elevation change of 154 feet and an average elevation above sea level of 58 feet. Within 10 miles also contains only modest variations in elevation (220 feet). Within 50 miles also contains only modest variations in elevation (482 feet).

The area within 2 miles of San Isidro is covered by artificial surfaces (46%), shrubs (24%), and water (14%), within 10 miles by water (35%) and artificial surfaces (24%), and within 50 miles by cropland (30%) and water (24%).