Average Weather in Sam Rayburn Texas, United States
In Sam Rayburn, the summers are hot and oppressive; the winters are short, cold, and wet; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 41°F to 94°F and is rarely below 28°F or above 99°F.
Based on the tourism score, the best times of year to visit Sam Rayburn for warm-weather activities are from early April to early June and from mid September to late October.
The hot season lasts for 3.8 months, from May 30 to September 23, with an average daily high temperature above 87°F. The hottest day of the year is August 11, with an average high of 94°F and low of 73°F.
The cool season lasts for 2.8 months, from November 28 to February 22, with an average daily high temperature below 67°F. The coldest day of the year is January 7, with an average low of 41°F and high of 60°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
In Sam Rayburn, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.
The clearer part of the year in Sam Rayburn begins around September 12 and lasts for 2.4 months, ending around November 23. On October 12, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 70% of the time, and overcast or mostly cloudy 30% of the time.
The cloudier part of the year begins around November 23 and lasts for 9.6 months, ending around September 12. On January 3, the cloudiest day of the year, the sky is overcast or mostly cloudy 49% of the time, and clear, mostly clear, or partly cloudy 51% 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 Sam Rayburn varies throughout the year.
The wetter season lasts 3.8 months, from May 14 to September 8, with a greater than 32% chance of a given day being a wet day. The chance of a wet day peaks at 40% on June 22.
The drier season lasts 8.2 months, from September 8 to May 14. The smallest chance of a wet day is 24% on October 11.
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 40% on June 22.
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. Sam Rayburn experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Sam Rayburn. The most rain falls during the 31 days centered around November 25, with an average total accumulation of 4.7 inches.
The least rain falls around August 1, with an average total accumulation of 2.6 inches.
Average Monthly Rainfall
The length of the day in Sam Rayburn varies significantly over the course of the year. In 2018, the shortest day is December 21, with 10 hours, 8 minutes of daylight; the longest day is June 21, with 14 hours, 10 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:11 AM on June 11, and the latest sunrise is 1 hour, 21 minutes later at 7:33 AM on November 3. The earliest sunset is at 5:13 PM on December 3, and the latest sunset is 3 hours, 10 minutes later at 8:23 PM on June 30.
Daylight saving time (DST) is observed in Sam Rayburn during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
Sam Rayburn experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 6.3 months, from April 15 to October 24, during which time the comfort level is muggy, oppressive, or miserable at least 27% of the time. The muggiest day of the year is July 23, with muggy conditions 98% 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
The average hourly wind speed in Sam Rayburn experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 7.4 months, from October 15 to May 28, with average wind speeds of more than 4.2 miles per hour. The windiest day of the year is April 1, with an average hourly wind speed of 5.0 miles per hour.
The calmer time of year lasts for 4.6 months, from May 28 to October 15. The calmest day of the year is July 30, with an average hourly wind speed of 3.4 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Sam Rayburn varies throughout the year.
The wind is most often from the south for 11 months, from January 26 to December 18, with a peak percentage of 63% on June 26. The wind is most often from the north for 1.3 months, from December 18 to January 26, with a peak percentage of 35% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Sam Rayburn 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 Sam Rayburn for general outdoor tourist activities are from early April to early June and from mid September to late October, with a peak score in the first week of May.
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 Sam Rayburn for hot-weather activities is from mid May to late September, with a peak score in the second 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.
The growing season in Sam Rayburn typically lasts for 8.7 months (267 days), from around March 3 to around November 25, rarely starting before February 3 or after March 25, and rarely ending before November 2 or after December 19.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Sam Rayburn should appear around January 20, only rarely appearing before January 12 or after February 3.
Growing Degree Days
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 4.4 months, from April 5 to August 19, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest day of the year is June 3, with an average of 6.6 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 3.6 kWh. The darkest day of the year is December 24, with an average of 2.8 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Sam Rayburn are 31.064 deg latitude, -94.036 deg longitude, and 197 ft elevation.
The topography within 2 miles of Sam Rayburn contains only modest variations in elevation, with a maximum elevation change of 325 feet and an average elevation above sea level of 216 feet. Within 10 miles contains only modest variations in elevation (495 feet). Within 50 miles also contains significant variations in elevation (587 feet).
The area within 2 miles of Sam Rayburn is covered by trees (80%) and water (19%), within 10 miles by trees (70%) and water (19%), and within 50 miles by trees (62%) and herbaceous vegetation (21%).
This report illustrates the typical weather in Sam Rayburn, 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 Sam Rayburn.
For each station, the records are corrected for the elevation difference between that station and Sam Rayburn 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 Sam Rayburn is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sam Rayburn and a given station.
The stations contributing to this reconstruction are: Jasper, Jasper County-Bell Field Airport (79%, 20 kilometers, south); Angelina County Airport (12%, 71 kilometers, west); and Ft. Polk, Peason Ridge (10%, 81 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .