Climate and Average Weather Year Round in Los Altos Mexico
In Los Altos, the wet season is hot, oppressive, and mostly cloudy and the dry season is warm, muggy, and partly cloudy. Over the course of the year, the temperature typically varies from 61°F to 91°F and is rarely below 53°F or above 95°F.
Based on the tourism score, the best time of year to visit Los Altos for warm-weather activities is from mid November to early April.
Climate in Los Altos
Average Temperature in Los Altos
The hot season lasts for 4.9 months, from April 25 to September 21, with an average daily high temperature above 88°F. The hottest day of the year is June 4, with an average high of 91°F and low of 78°F.
The cool season lasts for 2.4 months, from December 6 to February 18, with an average daily high temperature below 78°F. The coldest day of the year is January 7, with an average low of 61°F and high of 74°F.
Average High and Low Temperature in Los Altos
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in Los Altos
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
In Los Altos, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Los Altos begins around October 20 and lasts for 7.8 months, ending around June 13. On May 11, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 68% of the time, and overcast or mostly cloudy 32% of the time.
The cloudier part of the year begins around June 13 and lasts for 4.2 months, ending around October 20. On September 7, the cloudiest day of the year, the sky is overcast or mostly cloudy 74% of the time, and clear, mostly clear, or partly cloudy 26% of the time.
Cloud Cover Categories in Los Altos
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Los Altos varies significantly throughout the year.
The wetter season lasts 4.3 months, from June 6 to October 14, with a greater than 37% chance of a given day being a wet day. The chance of a wet day peaks at 59% on September 12.
The drier season lasts 7.7 months, from October 14 to June 6. The smallest chance of a wet day is 14% on March 15.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 59% on September 12.
Daily Chance of Precipitation in Los Altos
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Los Altos experiences extreme seasonal variation in monthly rainfall.
Rain falls throughout the year in Los Altos. The most rain falls during the 31 days centered around September 15, with an average total accumulation of 9.6 inches.
The least rain falls around March 7, with an average total accumulation of 1.2 inches.
Average Monthly Rainfall in Los Altos
The length of the day in Los Altos varies over the course of the year. In 2021, the shortest day is December 21, with 10 hours, 49 minutes of daylight; the longest day is June 20, with 13 hours, 27 minutes of daylight.
Hours of Daylight and Twilight in Los Altos
The earliest sunrise is at 6:21 AM on April 3, and the latest sunrise is 1 hour, 12 minutes later at 7:33 AM on October 30. The earliest sunset is at 5:47 PM on November 27, and the latest sunset is 2 hours, 30 minutes later at 8:17 PM on July 3.
Daylight saving time (DST) is observed in Los Altos during 2021, starting in the spring on April 4, lasting 6.8 months, and ending in the fall on October 31.
Sunrise & Sunset with Twilight and Daylight Saving Time in Los Altos
The figure below presents a compact representation of key lunar data for 2021. 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.
Moon Rise, Set & Phases in Los Altos
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.
Los Altos experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 9.5 months, from February 24 to December 8, during which time the comfort level is muggy, oppressive, or miserable at least 43% of the time. The muggiest day of the year is June 28, with muggy conditions 100% of the time.
The least muggy day of the year is January 24, with muggy conditions 25% of the time.
Humidity Comfort Levels in Los Altos
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 7.6 months, from November 16 to July 2, with average wind speeds of more than 8.6 miles per hour. The windiest day of the year is April 26, with an average hourly wind speed of 10.0 miles per hour.
The calmer time of year lasts for 4.4 months, from July 2 to November 16. The calmest day of the year is August 31, with an average hourly wind speed of 7.2 miles per hour.
Average Wind Speed in Los Altos
The predominant average hourly wind direction in Los Altos varies throughout the year.
The wind is most often from the east for 11 months, from January 11 to December 18, with a peak percentage of 77% on May 22. The wind is most often from the north for 3.4 weeks, from December 18 to January 11, with a peak percentage of 33% on January 1.
Wind Direction in Los Altos
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 water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 4.3 months, from June 7 to October 17, with an average temperature above 82°F. The day of the year with the warmest water is September 6, with an average temperature of 85°F.
The time of year with cooler water lasts for 3.1 months, from December 21 to March 26, with an average temperature below 74°F. The day of the year with the coolest water is January 30, with an average temperature of 72°F.
Average Water Temperature in Los Altos
Best Time of Year to Visit
To characterize how pleasant the weather is in Los Altos throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Los Altos for general outdoor tourist activities is from mid November to early April, with a peak score in the first week of March.
Tourism Score in Los Altos
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Los Altos for hot-weather activities is from mid March to late May, with a peak score in the last week of April.
Beach/Pool Score in Los Altos
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
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.
Time Spent in Various Temperature Bands and the Growing Season in Los Altos
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
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.
Growing Degree Days in Los Altos
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 experiences significant seasonal variation over the course of the year.
The brighter period of the year lasts for 2.7 months, from March 27 to June 16, with an average daily incident shortwave energy per square meter above 6.4 kWh. The brightest day of the year is May 22, with an average of 7.0 kWh.
The darker period of the year lasts for 2.5 months, from November 15 to February 1, with an average daily incident shortwave energy per square meter below 4.5 kWh. The darkest day of the year is December 30, with an average of 3.9 kWh.
Average Daily Incident Shortwave Solar Energy in Los Altos
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%).
This report illustrates the typical weather in Los Altos, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Los Altos.
For each station, the records are corrected for the elevation difference between that station and Los Altos according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Los Altos is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Los Altos and a given station.
The stations contributing to this reconstruction are: General Francisco Javier Mina International Airport (MMTM, 85%, 88 kilometers, north) and Tulancingo (MMTL, 15%, 171 kilometers, south).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for airports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.