Climate and Average Weather Year Round in Robstown Texas, United States
In Robstown, the summers are hot and oppressive; the winters are short, cool, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 48°F to 95°F and is rarely below 35°F or above 99°F.
Based on the beach/pool score, the best time of year to visit Robstown for hot-weather activities is from late April to late June.
Climate in Robstown
The hot season lasts for 3.7 months, from June 3 to September 24, with an average daily high temperature above 90°F. The hottest month of the year in Robstown is August, with an average high of 95°F and low of 76°F.
The cool season lasts for 2.6 months, from December 2 to February 21, with an average daily high temperature below 73°F. The coldest month of the year in Robstown is January, with an average low of 48°F and high of 68°F.
Average High and Low Temperature in Robstown
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 Robstown
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 Robstown, 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 Robstown begins around March 23 and lasts for 3.2 months, ending around June 29.
The clearest month of the year in Robstown is May, during which on average the sky is clear, mostly clear, or partly cloudy 70% of the time.
The cloudier part of the year begins around June 29 and lasts for 8.8 months, ending around March 23.
The cloudiest month of the year in Robstown is August, during which on average the sky is overcast or mostly cloudy 53% of the time.
Cloud Cover Categories in Robstown
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 Robstown varies throughout the year.
The wetter season lasts 5.5 months, from May 6 to October 21, with a greater than 22% chance of a given day being a wet day. The month with the most wet days in Robstown is September, with an average of 8.9 days with at least 0.04 inches of precipitation.
The drier season lasts 6.5 months, from October 21 to May 6. The month with the fewest wet days in Robstown is December, with an average of 3.6 days with at least 0.04 inches of precipitation.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Robstown is September, with an average of 8.9 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 33% on September 11.
Daily Chance of Precipitation in Robstown
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. Robstown experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Robstown. The month with the most rain in Robstown is September, with an average rainfall of 3.1 inches.
The month with the least rain in Robstown is December, with an average rainfall of 1.0 inches.
Average Monthly Rainfall in Robstown
The length of the day in Robstown varies over the course of the year. In 2021, the shortest day is December 21, with 10 hours, 23 minutes of daylight; the longest day is June 20, with 13 hours, 54 minutes of daylight.
Hours of Daylight and Twilight in Robstown
The earliest sunrise is at 6:34 AM on June 9, and the latest sunrise is 1 hour, 11 minutes later at 7:45 AM on November 6. The earliest sunset is at 5:35 PM on November 30, and the latest sunset is 2 hours, 56 minutes later at 8:30 PM on July 1.
Daylight saving time (DST) is observed in Robstown during 2021, starting in the spring on March 14, lasting 7.8 months, and ending in the fall on November 7.
Sunrise & Sunset with Twilight and Daylight Saving Time in Robstown
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 Robstown
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.
Robstown experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 7.8 months, from March 21 to November 15, during which time the comfort level is muggy, oppressive, or miserable at least 31% of the time. The month with the most muggy days in Robstown is July, with 30.6 days that are muggy or worse.
The month with the fewest muggy days in Robstown is January, with 2.9 days that are muggy or worse.
Humidity Comfort Levels in Robstown
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 Robstown experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 6.1 months, from January 16 to July 18, with average wind speeds of more than 10.4 miles per hour. The windiest month of the year in Robstown is April, with an average hourly wind speed of 11.9 miles per hour.
The calmer time of year lasts for 5.9 months, from July 18 to January 16. The calmest month of the year in Robstown is September, with an average hourly wind speed of 9.1 miles per hour.
Average Wind Speed in Robstown
The predominant average hourly wind direction in Robstown varies throughout the year.
The wind is most often from the south for 6.9 months, from January 31 to August 29 and for 1.5 months, from October 23 to December 7, with a peak percentage of 70% on July 17. The wind is most often from the east for 1.8 months, from August 29 to October 23, with a peak percentage of 50% on September 7. The wind is most often from the north for 1.8 months, from December 7 to January 31, with a peak percentage of 41% on January 1.
Wind Direction in Robstown
Robstown 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 significant seasonal variation over the course of the year.
The time of year with warmer water lasts for 4.1 months, from June 4 to October 9, with an average temperature above 81°F. The month of the year in Robstown with the warmest water is August, with an average temperature of 84°F.
The time of year with cooler water lasts for 3.4 months, from December 21 to April 3, with an average temperature below 68°F. The month of the year in Robstown with the coolest water is February, with an average temperature of 64°F.
Average Water Temperature in Robstown
To characterize how pleasant the weather is in Robstown 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 Robstown for general outdoor tourist activities are from mid March to mid May and from early October to mid November, with a peak score in the first week of April.
Tourism Score in Robstown
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 Robstown for hot-weather activities is from late April to late June, with a peak score in the third week of May.
Beach/Pool Score in Robstown
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).
The growing season in Robstown typically lasts for 11 months (346 days), from around January 17 to around December 30, rarely starting after February 28, or ending before November 28.
Time Spent in Various Temperature Bands and the Growing Season in Robstown
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.
Based on growing degree days alone, the first spring blooms in Robstown should appear around January 11, only rarely appearing before January 7 or after January 18.
Growing Degree Days in Robstown
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 12 to July 9, with an average daily incident shortwave energy per square meter above 6.2 kWh. The brightest month of the year in Robstown is June, with an average of 6.8 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 4.0 kWh. The darkest month of the year in Robstown is December, with an average of 3.3 kWh.
Average Daily Incident Shortwave Solar Energy in Robstown
For the purposes of this report, the geographical coordinates of Robstown are 27.790 deg latitude, -97.669 deg longitude, and 72 ft elevation.
The topography within 2 miles of Robstown is essentially flat, with a maximum elevation change of 13 feet and an average elevation above sea level of 73 feet. Within 10 miles is essentially flat (98 feet). Within 50 miles contains only modest variations in elevation (679 feet).
The area within 2 miles of Robstown is covered by cropland (74%) and artificial surfaces (26%), within 10 miles by cropland (83%), and within 50 miles by cropland (44%) and shrubs (21%).
This report illustrates the typical weather in Robstown, 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 Robstown.
For each station, the records are corrected for the elevation difference between that station and Robstown 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 Robstown is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Robstown and a given station.
The stations contributing to this reconstruction are:
To get a sense of how much these sources agree with each other, you can view a comparison of Robstown and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.
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.
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