Average Weather in Three Rivers Texas, United States
In Three Rivers, the summers are sweltering 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 46°F to 98°F and is rarely below 34°F or above 102°F.
Based on the beach/pool score, the best time of year to visit Three Rivers for hot-weather activities is from early May to early July.
The hot season lasts for 3.8 months, from May 28 to September 21, with an average daily high temperature above 91°F. The hottest day of the year is August 6, with an average high of 98°F and low of 75°F.
The cool season lasts for 2.7 months, from November 30 to February 19, with an average daily high temperature below 72°F. The coldest day of the year is January 5, with an average low of 46°F and high of 66°F.
Average High and Low Temperature
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
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 Three Rivers, 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 Three Rivers begins around April 17 and lasts for 2.4 months, ending around June 30. On June 2, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 74% of the time, and overcast or mostly cloudy 26% of the time.
The cloudier part of the year begins around June 30 and lasts for 9.6 months, ending around April 17. On August 4, the cloudiest day of the year, the sky is overcast or mostly cloudy 50% of the time, and clear, mostly clear, or partly cloudy 50% of the time.
Cloud Cover Categories
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 Three Rivers varies throughout the year.
The wetter season lasts 5.8 months, from April 29 to October 22, with a greater than 19% chance of a given day being a wet day. The chance of a wet day peaks at 28% on September 6.
The drier season lasts 6.2 months, from October 22 to April 29. The smallest chance of a wet day is 10% on December 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 28% on September 6.
Daily Chance of Precipitation
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. Three Rivers experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Three Rivers. The most rain falls during the 31 days centered around May 24, with an average total accumulation of 2.9 inches.
The least rain falls around December 17, with an average total accumulation of 1.0 inches.
Average Monthly Rainfall
The length of the day in Three Rivers varies over the course of the year. In 2021, the shortest day is December 21, with 10 hours, 20 minutes of daylight; the longest day is June 20, with 13 hours, 57 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:34 AM on June 10, and the latest sunrise is 1 hour, 14 minutes later at 7:48 AM on November 6. The earliest sunset is at 5:35 PM on December 1, and the latest sunset is 2 hours, 59 minutes later at 8:34 PM on July 1.
Daylight saving time (DST) is observed in Three Rivers 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
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
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.
Three Rivers experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 7.3 months, from March 29 to November 8, during which time the comfort level is muggy, oppressive, or miserable at least 26% of the time. The muggiest day of the year is July 16, with muggy conditions 93% of the time.
The least muggy day of the year is January 23, with muggy conditions 4% of the time.
Humidity Comfort Levels
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 Three Rivers experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 5.5 months, from February 15 to July 30, with average wind speeds of more than 9.9 miles per hour. The windiest day of the year is April 26, with an average hourly wind speed of 11.4 miles per hour.
The calmer time of year lasts for 6.6 months, from July 30 to February 15. The calmest day of the year is September 10, with an average hourly wind speed of 8.5 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Three Rivers varies throughout the year.
The wind is most often from the south for 7.0 months, from February 1 to August 31 and for 1.5 months, from October 24 to December 7, with a peak percentage of 69% on July 24. The wind is most often from the east for 1.8 months, from August 31 to October 24, with a peak percentage of 47% on September 7. The wind is most often from the north for 1.8 months, from December 7 to February 1, with a peak percentage of 37% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Three Rivers 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 Three Rivers for general outdoor tourist activities are from mid March to late May and from late September to mid November, with a peak score in the third week of April.
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 Three Rivers for hot-weather activities is from early May to early July, with a peak score in the first week of June.
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 Three Rivers typically lasts for 11 months (332 days), from around January 19 to around December 18, rarely starting after February 26, or ending before November 25.
Time Spent in Various Temperature Bands and the Growing Season
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 Three Rivers should appear around January 13, only rarely appearing before January 9 or after January 23.
Growing Degree Days
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 11 to August 4, with an average daily incident shortwave energy per square meter above 6.2 kWh. The brightest day of the year is June 12, with an average of 7.0 kWh.
The darker period of the year lasts for 2.6 months, from November 13 to February 2, with an average daily incident shortwave energy per square meter below 4.0 kWh. The darkest day of the year is December 19, with an average of 3.2 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Three Rivers are 28.460 deg latitude, -98.183 deg longitude, and 144 ft elevation.
The topography within 2 miles of Three Rivers contains only modest variations in elevation, with a maximum elevation change of 112 feet and an average elevation above sea level of 146 feet. Within 10 miles also contains only modest variations in elevation (282 feet). Within 50 miles contains only modest variations in elevation (758 feet).
The area within 2 miles of Three Rivers is covered by cropland (54%) and shrubs (34%), within 10 miles by cropland (46%) and shrubs (42%), and within 50 miles by shrubs (48%) and cropland (45%).
This report illustrates the typical weather in Three Rivers, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Three Rivers.
For each station, the records are corrected for the elevation difference between that station and Three Rivers 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 Three Rivers is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Three Rivers and a given station.
The stations contributing to this reconstruction are: Beeville Municipal Airport (42%, 47 kilometers, east); Pleasanton Municipal Airport (26%, 64 kilometers, northwest); Alice International Airport (18%, 82 kilometers, south); and Cotulla–La Salle County Airport (13%, 101 kilometers, west).
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.