This report describes the typical weather at the Guadalupe Pass A (Van Horn, Texas, United States) weather station over the course of an average year. It is based on the historical records from 1999 to 2012. Earlier records are either unavailable or unreliable.
Van Horn, Texas has a cold desert climate. The area within 25 mi of this station is covered by shrublands (71%), grasslands (23%), lakes and rivers (4%), and forests (2%).
Over the course of a year, the temperature typically varies from 32°F to 90°F and is rarely below 23°F or above 97°F.
The warm season lasts from May 19 to September 3 with an average daily high temperature above 82°F. The hottest day of the year is June 11, with an average high of 90°F and low of 66°F.
The cold season lasts from November 19 to February 21 with an average daily high temperature below 58°F. The coldest day of the year is December 31, with an average low of 32°F and high of 50°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 10:05 hours of daylight; the longest day is June 20 with 14:14 hours of daylight.
The earliest sunrise is at 6:53am on June 10 and the latest sunset is at 9:09pm on June 30. The latest sunrise is at 8:18am on November 3 and the earliest sunset is at 5:55pm on December 3.
Daylight savings time (DST) is observed in this location during 2012, starting in the spring on March 11 and ending in the fall on November 4.
The median cloud cover is 1% (clear) and does not vary substantially over the course of the year.
On February 23, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 75% of the time, and overcast or mostly cloudy 17% of the time.
On August 5, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 24% of the time, and clear or mostly clear 73% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around July 25, occurring in 35% of days. Precipitation is least likely around April 7, occurring in 13% of days.
Over the entire year, the most common forms of precipitation are light rain, moderate rain, and heavy rain.
Light rain is the most severe precipitation observed during 51% of those days with precipitation. It is most likely around August 2, when it is observed during 20% of all days.
Moderate rain is the most severe precipitation observed during 19% of those days with precipitation. It is most likely around July 26, when it is observed during 8% of all days.
Heavy rain is the most severe precipitation observed during 12% of those days with precipitation. It is most likely around July 21, when it is observed during 7% of all days.
During the warm season, which lasts from May 19 to September 3, there is a 28% 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 (61% of days with precipitation have at worst light rain), moderate rain (20%), and heavy rain (19%).
During the cold season, which lasts from November 19 to February 21, there is a 18% 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 (29% of days with precipitation have at worst light rain), moderate snow (25%), light snow (24%), and moderate rain (15%).
The likelihood of snow falling is highest around January 17, occurring in 12% of days. The season in which it is relatively likely for snow to fall spans from November 3 to March 16.
Either snow rarely accumulates at this location or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 20% (dry) to 75% (humid) over the course of the year, rarely dropping below 5% (very dry) and reaching as high as 100% (very humid).
The air is driest around June 9, at which time the relative humidity drops below 21% (dry) three days out of four; it is most humid around September 7, exceeding 62% (mildly humid) three days out of four.
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 11°F (dry) to 58°F (comfortable) and is rarely below -2°F (dry) or above 63°F (mildy humid).
The time of the year between June 19 and September 27 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of the year typical wind speeds vary from 3 mph to 37 mph (light air to high wind), rarely exceeding 49 mph (strong gale).
The highest average wind speed of 22 mph (fresh breeze) occurs around March 1, at which time the average daily maximum wind speed is 36 mph (high wind).
The lowest average wind speed of 14 mph (moderate breeze) occurs around August 10, at which time the average daily maximum wind speed is 24 mph (fresh breeze).