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Average Weather For Harlingen, Texas, USA

Location

This report describes the typical weather at the Valley International Airport (Harlingen, Texas, United States) weather station over the course of an average year. It is based on the historical records from 1984 to 2012. Earlier records are either unavailable or unreliable.

Harlingen, Texas has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by grasslands (81%), oceans and seas (7%), croplands (6%), and lakes and rivers (4%).

Temperature

Over the course of a year, the temperature typically varies from 50°F to 96°F and is rarely below 38°F or above 99°F.

Daily High and Low Temperature

The daily average low (blue) and high (red) temperature with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

The warm season lasts from May 23 to September 19 with an average daily high temperature above 90°F. The hottest day of the year is August 7, with an average high of 96°F and low of 76°F.

The cold season lasts from December 2 to February 18 with an average daily high temperature below 75°F. The coldest day of the year is January 4, with an average low of 50°F and high of 69°F.

Fraction of Time Spent in Various Temperature Bands

The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°F).
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March 2017
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May 2017
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June 2017
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July 2017
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August 2017
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September 2017
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January 2018
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February 2018
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Sun

The length of the day varies significantly over the course of the year. The shortest day is December 21 with 10:30 hours of daylight; the longest day is June 20 with 13:47 hours of daylight.

Daily Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line), with various degrees of daylight, twilight, and night, indicated by the color bands. From bottom (most yellow) to top (most gray): full daylight, solar twilight (Sun is visible but less than 6° from the horizon), civil twilight (Sun is not visible but is less than 6° below the horizon), nautical twilight (Sun is between 6° and 12° below the horizon), astronomical twilight (Sun is between 12° and 18° below the horizon), and full night.

The earliest sunrise is at 6:37am on June 13 and the latest sunset is at 8:27pm on July 5. The latest sunrise is at 7:43am on March 11 and the earliest sunset is at 5:38pm on December 1.

Daylight saving time (DST) is observed in this location during 2012, starting in the spring on March 11 and ending in the fall on November 4.

Daily Sunrise & Sunset with Twilight and Daylight Saving Time

The solar day over the course of the year 2012 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, 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.

Clouds

The median cloud cover ranges from 22% (mostly clear) to 75% (partly cloudy). The sky is cloudiest on January 12 and clearest on August 7. The clearer part of the year begins around May 21. The cloudier part of the year begins around November 20.

Median Cloud Cover

The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

On August 7, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 66% of the time, and overcast or mostly cloudy 21% of the time.

On January 12, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 55% of the time, and clear or mostly clear 34% of the time.

Cloud Cover Types

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around September 13, occurring in 35% of days. Precipitation is least likely around July 13, occurring in 22% of days.

Probability of Precipitation at Some Point in the Day

The fraction of days in which various types of precipitation are observed. If more than one type of precipitation is reported in a given day, the more severe precipitation is counted. For example, if light rain is observed in the same day as a thunderstorm, that day counts towards the thunderstorm totals. The order of severity is from the top down in this graph, with the most severe at the bottom.

Over the entire year, the most common forms of precipitation are light rain, thunderstorms, and moderate rain.

Light rain is the most severe precipitation observed during 42% of those days with precipitation. It is most likely around January 13, when it is observed during 18% of all days.

Thunderstorms are the most severe precipitation observed during 25% of those days with precipitation. They are most likely around August 28, when it is observed during 13% of all days.

Moderate rain is the most severe precipitation observed during 16% of those days with precipitation. It is most likely around September 28, when it is observed during 7% of all days.

Types of Precipitation Throughout the Year

Relative frequency of various types of precipitation over the course of a typical year.

During the warm season, which lasts from May 23 to September 19, there is a 26% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of thunderstorms (42% of days with precipitation have at worst thunderstorms), light rain (28%), moderate rain (15%), and heavy rain (13%).

During the cold season, which lasts from December 2 to February 18, there is a 32% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (53% of days with precipitation have at worst light rain), drizzle (18%), moderate rain (16%), and thunderstorms (9%).

Warm Season Precipitation

Cold Season Precipitation

Relative frequency of various types of precipitation during the warm and cold seasons respectively.

Snow

Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.

Humidity

The relative humidity typically ranges from 45% (comfortable) to 96% (very humid) over the course of the year, rarely dropping below 25% (dry) and reaching as high as 100% (very humid).

The air is driest around August 3, at which time the relative humidity drops below 49% (comfortable) three days out of four; it is most humid around September 12, exceeding 94% (very humid) three days out of four.

Relative Humidity

The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Dew Point

Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.

Over the course of a year, the dew point typically varies from 44°F (dry) to 77°F (oppressive) and is rarely below 28°F (dry) or above 79°F (oppressive).

There are two periods in the year that are most comfortable: The first is between January 1 and March 26 and the second is between November 17 and December 31. The air feels neither too dry nor too muggy during these periods.

Dew Point

The daily average low (blue) and high (red) dew point with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Wind

Over the course of the year typical wind speeds vary from 0 mph to 22 mph (calm to fresh breeze), rarely exceeding 30 mph (strong breeze).

The highest average wind speed of 13 mph (moderate breeze) occurs around April 29, at which time the average daily maximum wind speed is 21 mph (fresh breeze).

The lowest average wind speed of 9 mph (gentle breeze) occurs around September 4, at which time the average daily maximum wind speed is 18 mph (moderate breeze).

Wind Speed

The average daily minimum (red), maximum (green), and average (black) wind speed with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
The wind is most often out of the south east (28% of the time), south (16% of the time), and east (13% of the time). The wind is least often out of the south west (1% of the time) and west (2% of the time).

Wind Directions Over the Entire Year

The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Fraction of Time Spent with Various Wind Directions

The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.