Average Weather in Laredo Texas, United States

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4. Webb County
5. Laredo

In Laredo, the summers are long, sweltering, muggy, and windy; the winters are short, cool, and dry; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 48°F to 100°F and is rarely below 36°F or above 105°F.

The hot season lasts for 4.2 months, from May 11 to September 17, with an average daily high temperature above 93°F. The hottest day of the year is July 29, with an average high of 100°F and low of 78°F.

The cool season lasts for 2.6 months, from November 26 to February 15, with an average daily high temperature below 74°F. The coldest day of the year is January 5, with an average low of 48°F and high of 68°F.

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.

In Laredo, 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 Laredo begins around May 2 and lasts for 1.9 months, ending around June 29. On June 4, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 78% of the time, and overcast or mostly cloudy 22% of the time.

The cloudier part of the year begins around June 29 and lasts for 10 months, ending around May 2. On January 6, the cloudiest day of the year, the sky is overcast or mostly cloudy 46% of the time, and clear, mostly clear, or partly cloudy 54% of the time.

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

The wetter season lasts 5.4 months, from April 30 to October 11, with a greater than 19% chance of a given day being a wet day. The chance of a wet day peaks at 30% on September 13.

The drier season lasts 6.6 months, from October 11 to April 30. The smallest chance of a wet day is 8% on December 14.

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 September 13.

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. Laredo experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Laredo. The most rain falls during the 31 days centered around September 15, with an average total accumulation of 2.5 inches.

The least rain falls around December 17, with and average total accumulation of 0.7 inches.

The length of the day in Laredo varies over the course of the year. In 2017, the shortest day is December 21, with 10 hours, 24 minutes of daylight; the longest day is June 21, with 13 hours, 53 minutes of daylight.

The earliest sunrise is at 6:42 AM on June 9, and the latest sunrise is 1 hour, 9 minutes later at 7:50 AM on November 4. The earliest sunset is at 5:43 PM on November 30, and the latest sunset is 2 hours, 54 minutes later at 8:37 PM on July 1.

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

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.

Laredo experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 7.1 months, from April 4 to November 8, during which time the comfort level is muggy, oppressive, or miserable at least 21% of the time. The muggiest day of the year is June 24, with muggy conditions 81% of the time.

The least muggy day of the year is January 23, with muggy conditions 1% 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 Laredo experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.7 months, from March 6 to August 28, with average wind speeds of more than 5.7 miles per hour. The windiest day of the year is July 14, with an average hourly wind speed of 6.9 miles per hour.

The calmer time of year lasts for 6.3 months, from August 28 to March 6. The calmest day of the year is January 1, with an average hourly wind speed of 4.5 miles per hour.

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

The wind is most often from the south for 1.1 weeks, from January 28 to February 5; for 1.2 months, from June 25 to August 1; and for 1.1 months, from November 6 to December 8, with a peak percentage of 52% on July 18. The wind is most often from the east for 4.7 months, from February 5 to June 25 and for 3.2 months, from August 1 to November 6, with a peak percentage of 58% on September 5. The wind is most often from the north for 1.6 months, from December 8 to January 28, with a peak percentage of 34% on January 1.

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 3.8 months, from April 15 to August 10, with an average daily incident shortwave energy per square meter above 6.6 kWh. The brightest day of the year is June 13, with an average of 7.3 kWh.

The darker period of the year lasts for 2.6 months, from November 12 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 19, with an average of 3.4 kWh.

For the purposes of this report, the geographical coordinates of Laredo are 27.506 deg latitude, -99.508 deg longitude, and 420 ft elevation.

The topography within 2 miles of Laredo contains only modest variations in elevation, with a maximum elevation change of 167 feet and an average elevation above sea level of 417 feet. Within 10 miles also contains only modest variations in elevation (348 feet). Within 50 miles contains only modest variations in elevation (745 feet).

The area within 2 miles of Laredo is covered by artificial surfaces (77%) and shrubs (22%), within 10 miles by shrubs (55%) and grassland (21%), and within 50 miles by shrubs (70%) and grassland (20%).

This report illustrates the typical weather in Laredo, 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 Laredo.

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

The stations contributing to this reconstruction are: Laredo International Airport (98%, 5.0 kilometers, northeast) and Zapata County Airport (2.4%, 65 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.