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Average Weather in Weslaco Texas, United States

In Weslaco, the summers are hot and oppressive; the winters are short, cool, dry, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 51°F to 97°F and is rarely below 38°F or above 101°F.

The hot season lasts for 3.8 months, from May 25 to September 20, with an average daily high temperature above 91°F. The hottest day of the year is August 4, with an average high of 97°F and low of 77°F.

The cool season lasts for 2.5 months, from December 3 to February 18, with an average daily high temperature below 76°F. The coldest day of the year is January 5, with an average low of 51°F and high of 70°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 Weslaco12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDeccoldcoolcomfortablewarmhotsweltering
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 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.

Clouds

In Weslaco, 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 Weslaco begins around February 16 and lasts for 4.4 months, ending around June 27. On June 2, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 76% of the time, and overcast or mostly cloudy 24% of the time.

The cloudier part of the year begins around June 27 and lasts for 7.6 months, ending around February 16. On August 22, the cloudiest day of the year, the sky is overcast or mostly cloudy 56% of the time, and clear, mostly clear, or partly cloudy 44% of the time.

Cloud Cover

Cloud Cover in Weslacoclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecAug 2256%Aug 2256%Jun 224%Jun 224%Feb 1640%Feb 1640%Jun 2741%Jun 2741%overcastmostly cloudypartly cloudymostly clearclear
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. The chance of wet days in Weslaco varies throughout the year.

The wetter season lasts 4.5 months, from May 25 to October 10, with a greater than 22% chance of a given day being a wet day. The chance of a wet day peaks at 36% on September 14.

The drier season lasts 7.5 months, from October 10 to May 25. The smallest chance of a wet day is 8% on February 20.

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 36% on September 14.

Daily Chance of Precipitation

Daily Chance of Precipitation in Weslacowetdrydry0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecSep 1436%Sep 1436%Feb 208%Feb 208%Jan 110%Jan 110%May 2522%May 2522%Oct 1022%Oct 1022%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. Weslaco experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Weslaco. The most rain falls during the 31 days centered around September 16, with an average total accumulation of 3.6 inches.

The least rain falls around December 21, with an average total accumulation of 0.7 inches.

Average Monthly Rainfall

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 Weslaco varies over the course of the year. In 2017, the shortest day is December 21, with 10 hours, 30 minutes of daylight; the longest day is June 21, with 13 hours, 47 minutes of daylight.

Hours of Daylight and Twilight

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 6:39 AM on June 9, and the latest sunrise is 1 hour, 5 minutes later at 7:44 AM on March 12. The earliest sunset is at 5:39 PM on November 30, and the latest sunset is 2 hours, 49 minutes later at 8:28 PM on July 1.

Daylight saving time (DST) is observed in Weslaco during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in Weslaco2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecJun 96:39 AMJun 96:39 AM8:28 PMJul 18:28 PMJul 1Nov 305:39 PMNov 305:39 PM7:44 AMMar 127:44 AMMar 12Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnight
The solar day over the course of the year 2017. 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.

Weslaco experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 8.4 months, from March 13 to November 24, during which time the comfort level is muggy, oppressive, or miserable at least 34% of the time. The muggiest day of the year is June 30, with muggy conditions 97% of the time.

The least muggy day of the year is January 22, with muggy conditions 12% of the time.

Humidity Comfort Levels

Humidity Comfort Levels in Weslacomuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 2212%Jan 2212%97%Jun 3097%Jun 30Mar 1334%Mar 1334%Nov 2434%Nov 2434%miserablemiserableoppressiveoppressivemuggymuggyhumidhumiddrydry
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 Weslaco experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.5 months, from January 29 to August 12, with average wind speeds of more than 5.8 miles per hour. The windiest day of the year is April 26, with an average hourly wind speed of 6.8 miles per hour.

The calmer time of year lasts for 5.5 months, from August 12 to January 29. The calmest day of the year is September 9, with an average hourly wind speed of 4.8 miles per hour.

Average Wind Speed

Average Wind Speed in Weslacowindy0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mphJanFebMarAprMayJunJulAugSepOctNovDecApr 266.8 mphApr 266.8 mphSep 94.8 mphSep 94.8 mphJan 295.8 mphJan 295.8 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 Weslaco varies throughout the year.

The wind is most often from the south for 7.5 months, from January 15 to August 31 and for 2.2 months, from October 11 to December 18, with a peak percentage of 73% on July 17. The wind is most often from the east for 1.4 months, from August 31 to October 11, with a peak percentage of 48% on September 7. The wind is most often from the north for 4.0 weeks, from December 18 to January 15, with a peak percentage of 41% on January 1.

Wind Direction

Wind Direction in WeslacoNSESN0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecsoutheastnorthwest
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).

Water Temperature

Weslaco 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 4.4 months, from June 4 to October 16, with an average temperature above 80°F. The day of the year with the warmest water is September 5, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.3 months, from December 25 to April 4, with an average temperature below 69°F. The day of the year with the coolest water is February 19, with an average temperature of 66°F.

Average Water Temperature

The daily average water temperature (purple line), 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 significant seasonal variation over the course of the year.

The brighter period of the year lasts for 2.9 months, from April 11 to July 8, with an average daily incident shortwave energy per square meter above 6.4 kWh. The brightest day of the year is June 3, with an average of 7.2 kWh.

The darker period of the year lasts for 2.6 months, from November 14 to February 2, with an average daily incident shortwave energy per square meter below 4.2 kWh. The darkest day of the year is December 31, with an average of 3.5 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Weslacobrightdarkdark0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJanFebMarAprMayJunJulAugSepOctNovDecJun 37.2 kWhJun 37.2 kWhDec 313.5 kWhDec 313.5 kWhApr 116.4 kWhApr 116.4 kWhJul 86.4 kWhJul 86.4 kWhFeb 24.2 kWhFeb 24.2 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 Weslaco are 26.160 deg latitude, -97.991 deg longitude, and 72 ft elevation.

The topography within 2 miles of Weslaco is essentially flat, with a maximum elevation change of 23 feet and an average elevation above sea level of 74 feet. Within 10 miles is also essentially flat (82 feet). Within 50 miles is essentially flat (758 feet).

The area within 2 miles of Weslaco is covered by artificial surfaces (80%) and cropland (20%), within 10 miles by cropland (69%) and artificial surfaces (30%), and within 50 miles by cropland (60%) and grassland (18%).

Data Sources

This report illustrates the typical weather in Weslaco, 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 Weslaco.

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

The stations contributing to this reconstruction are: Mid Valley Airport (97%, 2.7 kilometers, northeast) and McAllen Miller International Airport (3.2%, 26 kilometers, west).

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.