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Average Weather in San Ysidro New Mexico, United States

In San Ysidro, the summers are hot and partly cloudy; the winters are short, cold, and mostly clear; and it is dry year round. Over the course of the year, the temperature typically varies from 32°F to 97°F and is rarely below 23°F or above 103°F.

Based on the tourism score, the best times of year to visit San Ysidro for warm-weather activities are from early May to late June and from mid August to mid October.

Climate Summary

coolwarmhotswelteringhotwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec80%80%60%60%clearovercastprecipitation: 1.6 inprecipitation: 1.6 in0.2 in0.2 inmuggy: 8%muggy: 8%0%0%drydrytourism score: 7.3tourism score: 7.31.11.1
Click on each chart for more information.

Temperature

The hot season lasts for 3.7 months, from May 20 to September 11, with an average daily high temperature above 89°F. The hottest day of the year is June 26, with an average high of 97°F and low of 69°F.

The cool season lasts for 2.9 months, from November 20 to February 17, with an average daily high temperature below 65°F. The coldest day of the year is January 1, with an average low of 32°F and high of 57°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

Average Hourly Temperature in San YsidroJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMvery coldvery coldcoldcoldcoldcoldcoolcoolcomfortablewarmwarmhotvery coldvery coldsweltering
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
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Caucete, Argentina (5,093 miles away); Shiraz, Iran (7,955 miles); and Muzaffarābād, Pakistan (7,835 miles) are the far-away foreign places with temperatures most similar to San Ysidro (view comparison).

Clouds

In San Ysidro, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in San Ysidro begins around March 19 and lasts for 3.6 months, ending around July 6. On June 12, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 80% of the time, and overcast or mostly cloudy 20% of the time.

The cloudier part of the year begins around July 6 and lasts for 8.4 months, ending around March 19. On August 5, the cloudiest day of the year, the sky is overcast or mostly cloudy 40% of the time, and clear, mostly clear, or partly cloudy 60% of the time.

Cloud Cover Categories

Cloud Cover Categories in San YsidroclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jun 1280%Jun 1280%Aug 560%Aug 560%Mar 1970%Mar 1970%clearovercastmostly clearpartly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in San Ysidro varies throughout the year.

The wetter season lasts 2.6 months, from June 30 to September 17, with a greater than 17% chance of a given day being a wet day. The chance of a wet day peaks at 30% on August 3.

The drier season lasts 9.4 months, from September 17 to June 30. The smallest chance of a wet day is 3% on March 19.

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 30% on August 3.

Daily Chance of Precipitation

Daily Chance of Precipitation in San YsidrowetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Aug 330%Aug 330%Mar 193%Mar 193%Jan 18%Jan 18%Jun 3017%Jun 3017%Sep 1717%Sep 1717%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

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. San Ysidro experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 6.3 months, from June 14 to December 24, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around August 2, with an average total accumulation of 1.6 inches.

The rainless period of the year lasts for 5.7 months, from December 24 to June 14. The least rain falls around March 28, with an average total accumulation of 0.2 inches.

Average Monthly Rainfall

Average Monthly Rainfall in San YsidrorainJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 in2.5 in3.0 in3.5 inAug 21.6 inAug 21.6 inMar 280.2 inMar 280.2 inDec 170.5 inDec 170.5 inJun 140.5 inJun 140.5 in
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

The length of the day in San Ysidro varies significantly over the course of the year. In 2018, the shortest day is December 21, with 10 hours, 2 minutes of daylight; the longest day is June 21, with 14 hours, 17 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in San YsidroJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2014 hr, 17 minJun 2114 hr, 17 minJun 2112 hr, 8 minSep 2212 hr, 8 minSep 2210 hr, 2 minDec 2110 hr, 2 minDec 21nightnightday
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:59 AM on June 11, and the latest sunrise is 1 hour, 26 minutes later at 7:26 AM on November 3. The earliest sunset is at 5:01 PM on December 4, and the latest sunset is 3 hours, 17 minutes later at 8:18 PM on June 30.

Daylight saving time (DST) is observed in San Ysidro during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in San YsidroJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 115:59 AMJun 115:59 AM8:18 PMJun 308:18 PMJun 30Dec 45:01 PMDec 45:01 PM7:26 AMNov 37:26 AMNov 3Mar 11DSTMar 11DSTDSTNov 4DSTNov 4daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2018. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Humidity

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 perceived humidity level in San Ysidro, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 4% of 4% throughout.

Humidity Comfort Levels

Humidity Comfort Levels in San YsidroJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Nov 260%Nov 260%Aug 58%Aug 58%drydryhumidhumidcomfortablecomfortablemuggymuggy
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

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 Ysidro experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 4.5 months, from February 6 to June 21, with average wind speeds of more than 8.7 miles per hour. The windiest day of the year is April 11, with an average hourly wind speed of 11.1 miles per hour.

The calmer time of year lasts for 7.5 months, from June 21 to February 6. The calmest day of the year is August 15, with an average hourly wind speed of 6.3 miles per hour.

Average Wind Speed

Average Wind Speed in San YsidrowindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mph20 mphApr 1111.1 mphApr 1111.1 mphAug 156.3 mphAug 156.3 mphFeb 68.7 mphFeb 68.7 mphJun 218.7 mphJun 218.7 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in San Ysidro varies throughout the year.

The wind is most often from the south for 1.2 months, from June 25 to July 31 and for 2.7 weeks, from September 16 to October 5, with a peak percentage of 36% on July 21. The wind is most often from the east for 1.5 months, from July 31 to September 16, with a peak percentage of 38% on August 25. The wind is most often from the west for 8.7 months, from October 5 to June 25, with a peak percentage of 35% on January 1.

Wind Direction

Wind Direction in San YsidroWSESWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is in San Ysidro 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 times of year to visit San Ysidro for general outdoor tourist activities are from early May to late June and from mid August to mid October, with a peak score in the first week of June.

Tourism Score

Tourism Score in San Ysidrobest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.37.31.11.17.37.36.26.2 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 San Ysidro for hot-weather activities is from early June to late August, with a peak score in the last week of June.

Beach/Pool Score

Beach/Pool Score in San Ysidrobest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.27.20.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

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.

Growing Season

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 in San Ysidro typically lasts for 8.0 months (243 days), from around March 13 to around November 12, rarely starting before February 22 or after April 3, and rarely ending before October 24 or after December 1.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in San Ysidrogrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 1350%Mar 1350%Nov 1250%Nov 1290%Apr 390%Apr 390%Oct 2490%Oct 2410%Feb 2210%Feb 2210%Dec 110%Dec 10%Jan 150%Jan 15Jul 15100%Jul 15100%very coldcoldcoolcomfortablewarmhot
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
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

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.

Based on growing degree days alone, the first spring blooms in San Ysidro should appear around February 6, only rarely appearing before January 27 or after February 18.

Growing Degree Days

Growing Degree Days in San YsidroJanFebMarAprMayJunJulAugSepOctNovDec0°F1,000°F2,000°F3,000°F4,000°F5,000°F6,000°FFeb 689°FFeb 689°FApr 29900°FApr 29900°FDec 315,792°FDec 315,792°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.0 months, from April 13 to July 15, with an average daily incident shortwave energy per square meter above 7.4 kWh. The brightest day of the year is June 6, with an average of 8.4 kWh.

The darker period of the year lasts for 3.0 months, from November 6 to February 5, with an average daily incident shortwave energy per square meter below 4.4 kWh. The darkest day of the year is December 23, with an average of 3.4 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in San YsidrobrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWh10 kWhJun 68.4 kWhJun 68.4 kWhDec 233.4 kWhDec 233.4 kWhApr 137.4 kWhApr 137.4 kWhFeb 54.4 kWhFeb 54.4 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of San Ysidro are 32.351 deg latitude, -106.811 deg longitude, and 3,914 ft elevation.

The topography within 2 miles of San Ysidro contains only modest variations in elevation, with a maximum elevation change of 167 feet and an average elevation above sea level of 3,921 feet. Within 10 miles contains only modest variations in elevation (1,985 feet). Within 50 miles contains large variations in elevation (5,338 feet).

The area within 2 miles of San Ysidro is covered by cropland (50%) and shrubs (40%), within 10 miles by shrubs (84%) and cropland (11%), and within 50 miles by shrubs (92%).

Data Sources

This report illustrates the typical weather in San Ysidro, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in San Ysidro.

For each station, the records are corrected for the elevation difference between that station and San Ysidro 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 San Ysidro is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between San Ysidro and a given station.

The stations contributing to this reconstruction are: Las Cruces International Airport (74%, 13 kilometers, southwest); Biggs Army Air Field (12%, 69 kilometers, southeast); Holloman Air Force Base (8%, 87 kilometers, northeast); and Truth or Consequences Municipal Airport (6%, 108 kilometers, northwest).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.

Disclaimer

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.