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Average Weather at Port Isabel, Port Isabel-Cameron County Airport Texas, United States

At Port Isabel, Port Isabel-Cameron County Airport, the summers are long, hot, and oppressive; the winters are short, cool, and dry; and it is windy and partly cloudy year round. Over the course of the year, the temperature typically varies from 53°F to 93°F and is rarely below 40°F or above 96°F.

The hot season lasts for 4.0 months, from May 26 to September 25, with an average daily high temperature above 88°F. The hottest day of the year is August 3, with an average high of 93°F and low of 79°F.

The cool season lasts for 2.6 months, from December 5 to February 23, with an average daily high temperature below 74°F. The coldest day of the year is January 5, with an average low of 53°F and high of 69°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 at Port Isabel, Port Isabel-Cameron County Airport12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDeccoolcoolcomfortablecomfortablewarmwarmhothot
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

At Port Isabel, Port Isabel-Cameron County Airport, 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 at Port Isabel, Port Isabel-Cameron County Airport begins around February 2 and lasts for 4.8 months, ending around June 27. On June 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 75% of the time, and overcast or mostly cloudy 25% of the time.

The cloudier part of the year begins around June 27 and lasts for 7.1 months, ending around February 2. On August 1, the cloudiest day of the year, the sky is overcast or mostly cloudy 60% of the time, and clear, mostly clear, or partly cloudy 40% of the time.

Cloud Cover

Cloud Cover at Port Isabel, Port Isabel-Cameron County Airportclearerclearercloudiercloudiercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecAug 160%Aug 160%Jun 325%Jun 325%Feb 242%Feb 242%Jun 2743%Jun 2743%overcastovercastmostly cloudymostly cloudymostly clearmostly clearclearclear
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 at Port Isabel, Port Isabel-Cameron County Airport varies significantly throughout the year.

The wetter season lasts 2.0 months, from August 20 to October 21, with a greater than 23% chance of a given day being a wet day. The chance of a wet day peaks at 38% on September 14.

The drier season lasts 10.0 months, from October 21 to August 20. The smallest chance of a wet day is 7% on February 21.

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 38% on September 14.

Daily Chance of Precipitation

Daily Chance of Precipitation at Port Isabel, Port Isabel-Cameron County Airportwetwetdrydrydrydry0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecSep 1438%Sep 1438%Feb 217%Feb 217%Jan 111%Jan 111%Aug 2023%Aug 2023%Oct 2123%Oct 2123%rainrainmixedmixed
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. Port Isabel, Port Isabel-Cameron County Airport experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year at Port Isabel, Port Isabel-Cameron County Airport. The most rain falls during the 31 days centered around September 17, with an average total accumulation of 4.0 inches.

The least rain falls around December 20, with and average total accumulation of 0.8 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 at Port Isabel, Port Isabel-Cameron County Airport 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

Hours of Daylight and Twilight at Port Isabel, Port Isabel-Cameron County Airport0 hr4 hr8 hr12 hr16 hr20 hr24 hrJanFebMarAprMayJunJulAugSepOctNovDec12 hr, 6 minMar 2012 hr, 6 minMar 2013 hr, 47 minJun 2113 hr, 47 minJun 2112 hr, 7 minSep 2212 hr, 7 minSep 2210 hr, 30 minDec 2110 hr, 30 minDec 21nightnightdayday
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 6:36 AM on June 8, and the latest sunrise is 1 hour, 5 minutes later at 7:41 AM on March 12. The earliest sunset is at 5:37 PM on November 29, and the latest sunset is 2 hours, 49 minutes later at 8:25 PM on July 1.

Daylight saving time (DST) is observed at Port Isabel, Port Isabel-Cameron County Airport 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 at Port Isabel, Port Isabel-Cameron County Airport2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecJun 86:36 AMJun 86:36 AM8:25 PMJul 18:25 PMJul 1Nov 295:37 PMNov 295:37 PM7:41 AMMar 127:41 AMMar 12Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daydaynightnightnightnight
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.

Port Isabel, Port Isabel-Cameron County Airport experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 8.6 months, from March 13 to November 30, during which time the comfort level is muggy, oppressive, or miserable at least 38% of the time. The muggiest day of the year is July 24, with muggy conditions 100% of the time.

The least muggy day of the year is January 23, with muggy conditions 17% of the time.

Humidity Comfort Levels

Humidity Comfort Levels at Port Isabel, Port Isabel-Cameron County Airportmuggymuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 2317%Jan 2317%100%Jul 24100%Jul 24Mar 1338%Mar 1338%Nov 3038%Nov 3038%miserablemiserableoppressiveoppressivecomfortablecomfortabledrydry
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 at Port Isabel, Port Isabel-Cameron County Airport experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 9.3 months, from October 19 to July 28, with average wind speeds of more than 6.2 miles per hour. The windiest day of the year is April 9, with an average hourly wind speed of 7.1 miles per hour.

The calmer time of year lasts for 2.7 months, from July 28 to October 19. The calmest day of the year is September 1, with an average hourly wind speed of 5.3 miles per hour.

Average Wind Speed

Average Wind Speed at Port Isabel, Port Isabel-Cameron County Airportwindywindywindywindy0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mph11 mphJanFebMarAprMayJunJulAugSepOctNovDecApr 97.1 mphApr 97.1 mphSep 15.3 mphSep 15.3 mphOct 196.2 mphOct 196.2 mphJul 286.2 mphJul 286.2 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 at Port Isabel, Port Isabel-Cameron County Airport varies throughout the year.

The wind is most often from the south for 7.7 months, from January 8 to August 30 and for 2.5 months, from October 13 to December 29, with a peak percentage of 73% on July 17. The wind is most often from the east for 1.5 months, from August 30 to October 13, with a peak percentage of 49% on September 8. The wind is most often from the north for 1.4 weeks, from December 29 to January 8, with a peak percentage of 40% on January 1.

Wind Direction

Wind Direction at Port Isabel, Port Isabel-Cameron County AirportSSEESS0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecsouthsoutheasteastnorthnorthwestwest
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

Port Isabel, Port Isabel-Cameron County Airport 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 17, 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 26 to April 5, with an average temperature below 70°F. The day of the year with the coolest water is February 19, with an average temperature of 66°F.

Average Water Temperature

Average Water Temperature at Port Isabel, Port Isabel-Cameron County Airportwarmwarmcoolcool60°F65°F70°F75°F80°F85°FJanFebMarAprMayJunJulAugSepOctNovDecSep 584°FSep 584°F66°FFeb 1966°FFeb 19Jun 480°FJun 480°FOct 1780°FOct 1780°FDec 2670°FDec 2670°FApr 570°FApr 570°F
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 2.7 months, from April 10 to July 2, with an average daily incident shortwave energy per square meter above 6.3 kWh. The brightest day of the year is June 3, with an average of 7.1 kWh.

The darker period of the year lasts for 2.6 months, from November 15 to February 3, with an average daily incident shortwave energy per square meter below 4.1 kWh. The darkest day of the year is December 31, with an average of 3.3 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Port Isabel, Port Isabel-Cameron County Airportbrightbrightdarkdarkdarkdark0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJanFebMarAprMayJunJulAugSepOctNovDecJun 37.1 kWhJun 37.1 kWhDec 313.3 kWhDec 313.3 kWhApr 106.3 kWhApr 106.3 kWhFeb 34.1 kWhFeb 34.1 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 Port Isabel, Port Isabel-Cameron County Airport are 26.159 deg latitude, -97.338 deg longitude, and 10 ft elevation.

The topography within 2 miles of Port Isabel, Port Isabel-Cameron County Airport is essentially flat, with a maximum elevation change of 20 feet and an average elevation above sea level of 9 feet. Within 10 miles is also essentially flat (33 feet). Within 50 miles is essentially flat (157 feet).

The area within 2 miles of Port Isabel, Port Isabel-Cameron County Airport is covered by grassland (32%), artificial surfaces (29%), shrubs (18%), and herbaceous vegetation (13%), within 10 miles by water (32%) and grassland (21%), and within 50 miles by water (48%) and cropland (26%).

Data Sources

This report illustrates the typical weather at Port Isabel, Port Isabel-Cameron County Airport, 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

Port Isabel, Port Isabel-Cameron County Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Brownsville-South Padre Island International Airport; Rio Grande Valley International Airport; Mid Valley Airport; Edinburg Rio Grande Valley Regional Freight Terminal Airport; McAllen Miller International Airport; Brooks County Airport; Kingsville, Naval Air Station; and Corpus Christi, Corpus Christi Naval Air Station/Truax Field.

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.