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  4. Santa María del Río
  5. May

Average Weather in May in Santa María del Río Mexico

Daily high temperatures are around 83°F, rarely falling below 75°F or exceeding 91°F. The highest daily average high temperature is 84°F on May 11.

Daily low temperatures increase by 3°F, from 55°F to 58°F, rarely falling below 50°F or exceeding 62°F.

For reference, on May 10, the hottest day of the year, temperatures in Santa María del Río typically range from 56°F to 84°F, while on January 7, the coldest day of the year, they range from 42°F to 69°F.

Average High and Low Temperature in May

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 hourly average temperatures for the quarter of the year centered on May. 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.

Average Hourly Temperature in May

Average Hourly Temperature in May in Santa María del Río18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMAprJuncoldcoolcomfortablecomfortablewarmcoolcoolcomfortable
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.

Cochabamba, Bolivia (3,582 miles away); Lalapanzi, Zimbabwe (9,280 miles); and Soavinandriana, Madagascar (10,339 miles) are the far-away foreign places with temperatures most similar to Santa María del Río (view comparison).

Clouds

The month of May in Santa María del Río experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 36% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 34% on May 16.

The clearest day of the month is May 16, with clear, mostly clear, or partly cloudy conditions 66% of the time.

For reference, on September 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 77%, while on May 16, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 66%.

Cloud Cover Categories in May

Cloud Cover Categories in May in Santa María del Río1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJunSep 1523%Sep 1523%May 162%May 162%May 3162%May 3162%May 1165%May 1165%May 2165%May 2165%clearmostly clearpartly cloudymostly cloudyovercast
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Santa María del Río, the chance of a wet day over the course of May is very rapidly increasing, starting the month at 12% and ending it at 25%.

For reference, the year's highest daily chance of a wet day is 40% on July 15, and its lowest chance is 2% on December 8.

Probability of Precipitation in May

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 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 May in Santa María del Río is rapidly increasing, starting the month at 0.8 inches, when it rarely exceeds 2.3 inches, and ending the month at 1.9 inches, when it rarely exceeds 4.1 inches or falls below 0.2 inches.

Average Monthly Rainfall in May

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

Over the course of May in Santa María del Río, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 25 minutes, implying an average daily increase of 50 seconds, and weekly increase of 5 minutes, 48 seconds.

The shortest day of the month is May 1, with 12 hours, 57 minutes of daylight and the longest day is May 31, with 13 hours, 22 minutes of daylight.

Hours of Daylight and Twilight in May

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 latest sunrise of the month in Santa María del Río is 7:11 AM on May 1 and the earliest sunrise is 12 minutes earlier at 6:59 AM on May 31.

The earliest sunset is 8:08 PM on May 1 and the latest sunset is 13 minutes later at 8:21 PM on May 31.

Daylight saving time is observed in Santa María del Río during 2018, but it neither starts nor ends during May, so the entire month is in daylight saving time.

For reference, on June 21, the longest day of the year, the Sun rises at 7:00 AM and sets 13 hours, 28 minutes later, at 8:28 PM, while on December 21, the shortest day of the year, it rises at 7:16 AM and sets 10 hours, 48 minutes later, at 6:05 PM.

Sunrise & Sunset with Twilight in May

The solar day over the course of May. 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.

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 chance that a given day will be muggy in Santa María del Río is essentially constant during May, remaining around 0% throughout.

For reference, on June 25, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in May

Humidity Comfort Levels in May in Santa María del Río1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%10%20%30%40%50%60%70%80%90%100%AprJunMay 10%May 10%May 310%May 310%May 110%May 110%May 210%May 210%humidhumidcomfortablecomfortabledrydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

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 Santa María del Río is essentially constant during May, remaining within 0.2 miles per hour of 8.0 miles per hour throughout.

For reference, on July 2, the windiest day of the year, the daily average wind speed is 9.4 miles per hour, while on December 2, the calmest day of the year, the daily average wind speed is 7.1 miles per hour.

The lowest daily average wind speed during May is 7.8 miles per hour on May 14.

Average Wind Speed in May

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The hourly average wind direction in Santa María del Río throughout May is predominantly from the east, with a peak proportion of 72% on May 31.

Wind Direction in May

Wind Direction in May in Santa María del Río1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJunwesteastsouthnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

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 Santa María del Río typically lasts for 12 months (353 days), from around January 16 to around January 5, rarely starting after March 1, or ending before November 19.

The month of May in Santa María del Río is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in May

Time Spent in Various Temperature Bands and the Growing Season in May in Santa María del Ríogrowing season1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJun100%May 16100%May 16coldcoolcomfortablewarmhot
The percentage of time spent in various temperature bands: 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 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.

The average accumulated growing degree days in Santa María del Río are rapidly increasing during May, increasing by 577°F, from 1,401°F to 1,978°F, over the course of the month.

Growing Degree Days in May

The average growing degree days accumulated over the course of May, 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 in Santa María del Río is essentially constant during May, remaining within 0.1 kWh of 7.5 kWh throughout.

Average Daily Incident Shortwave Solar Energy in May

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 Santa María del Río are 21.796 deg latitude, -100.738 deg longitude, and 6,056 ft elevation.

The topography within 2 miles of Santa María del Río contains very significant variations in elevation, with a maximum elevation change of 1,017 feet and an average elevation above sea level of 5,911 feet. Within 10 miles contains very significant variations in elevation (2,986 feet). Within 50 miles contains large variations in elevation (6,867 feet).

The area within 2 miles of Santa María del Río is covered by shrubs (54%) and grassland (43%), within 10 miles by grassland (50%) and shrubs (44%), and within 50 miles by grassland (39%) and shrubs (35%).

Data Sources

This report illustrates the typical weather in Santa María del Río year round, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Santa María del Río.

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

The stations contributing to this reconstruction are: Ponciano Arriaga International Airport (65%, 55 kilometers, north); Del Bajío International Airport (20%, 119 kilometers, southwest); and Querétaro Intercontinental Airport (15%, 143 kilometers, southeast).

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.