Fall Weather in Los Altos Mexico

Daily high temperatures decrease by 11°F, from 89°F to 78°F, rarely falling below 69°F or exceeding 93°F.

Daily low temperatures decrease by 12°F, from 77°F to 65°F, rarely falling below 57°F or exceeding 79°F.

For reference, on June 3, the hottest day of the year, temperatures in Los Altos typically range from 78°F to 91°F, while on January 7, the coldest day of the year, they range from 61°F to 74°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.

Kaohsiung, Taiwan (8,463 miles away) is the far-away foreign place with temperatures most similar to Los Altos (view comparison).

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The fall in Los Altos experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 73% to 39%. The highest chance of overcast or mostly cloudy conditions is 74% on September 6. The lowest chance of overcast or mostly cloudy conditions is 39% on November 17.

The clearest day of the fall is November 17, with clear, mostly clear, or partly cloudy conditions 61% of the time.

For reference, on September 6, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 74%, while on May 10, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 68%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Los Altos, the chance of a wet day over the course of the fall is very rapidly decreasing, starting the season at 58% and ending it at 21%.

For reference, the year's highest daily chance of a wet day is 59% on September 14, and its lowest chance is 14% on March 15.

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 Los Altos is very rapidly decreasing, starting the season at 8.9 inches, when it rarely exceeds 15.2 inches or falls below 3.8 inches, and ending the season at 1.9 inches, when it rarely exceeds 3.9 inches or falls below 0.3 inches.

The highest average 31-day accumulation is 9.6 inches on September 14.

Over the course of the fall in Los Altos, 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, 37 minutes, implying an average daily decrease of 1 minute, 4 seconds, and weekly decrease of 7 minutes, 31 seconds.

The shortest day of the fall is November 30, with 10 hours, 55 minutes of daylight and the longest day is September 1, with 12 hours, 32 minutes of daylight.

The earliest sunrise of the fall in Los Altos is 6:14 AM on September 1 and the latest sunrise is 38 minutes later at 6:52 AM on November 30.

The latest sunset is 6:46 PM on September 1 and the earliest sunset is 59 minutes earlier at 5:47 PM on November 26.

Daylight saving time is not observed in Los Altos during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:49 AM and sets 13 hours, 27 minutes later, at 7:16 PM, while on December 21, the shortest day of the year, it rises at 7:04 AM and sets 10 hours, 49 minutes later, at 5:54 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 Los Altos is very rapidly decreasing during the fall, falling from 100% to 49% over the course of the season.

For reference, on June 24, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 24, the least muggy day of the year, there are muggy conditions 25% 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 Los Altos is increasing during the fall, increasing from 7.2 miles per hour to 8.7 miles per hour over the course of the season.

For reference, on April 25, the windiest day of the year, the daily average wind speed is 10.0 miles per hour, while on August 30, the calmest day of the year, the daily average wind speed is 7.2 miles per hour.

The hourly average wind direction in Los Altos throughout the fall is predominantly from the east, with a peak proportion of 55% on September 1.

Los Altos 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 Los Altos is rapidly decreasing during the fall, falling by 8°F, from 85°F to 76°F, over the course of the season.

The highest average surface water temperature during the fall is 85°F on September 8.

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 Los Altos 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 Los Altos are very rapidly increasing during the fall, increasing by 2,466°F, from 6,577°F to 9,043°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 Los Altos is decreasing during the fall, falling by 1.0 kWh, from 5.2 kWh to 4.2 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Los Altos are 21.510 deg latitude, -97.757 deg longitude, and 66 ft elevation.

The topography within 2 miles of Los Altos contains only modest variations in elevation, with a maximum elevation change of 161 feet and an average elevation above sea level of 54 feet. Within 10 miles contains only modest variations in elevation (1,138 feet). Within 50 miles contains very significant variations in elevation (4,373 feet).

The area within 2 miles of Los Altos is covered by cropland (100%), within 10 miles by cropland (98%), and within 50 miles by cropland (64%) and water (34%).