Average Weather in April in Sam Rayburn Texas, United States
Daily high temperatures increase by 6°F, from 75°F to 81°F, rarely falling below 65°F or exceeding 88°F.
Daily low temperatures increase by 7°F, from 54°F to 61°F, rarely falling below 41°F or exceeding 71°F.
For reference, on August 11, the hottest day of the year, temperatures in Sam Rayburn typically range from 73°F to 94°F, while on January 7, the coldest day of the year, they range from 41°F to 60°F.
Average High and Low Temperature in April
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. The horizontal axis is the day, 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 April
The month of April in Sam Rayburn experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 39% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 38% on April 22.
The clearest day of the month is April 22, with clear, mostly clear, or partly cloudy conditions 62% of the time.
For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 49%, while on October 12, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 70%.
Cloud Cover Categories in April
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Sam Rayburn, the chance of a wet day over the course of April is gradually increasing, starting the month at 26% and ending it at 29%.
For reference, the year's highest daily chance of a wet day is 40% on June 22, and its lowest chance is 24% on October 11.
Probability of Precipitation in April
The average sliding 31-day rainfall during April in Sam Rayburn is gradually increasing, starting the month at 3.7 inches, when it rarely exceeds 6.9 inches or falls below 1.1 inches, and ending the month at 4.0 inches, when it rarely exceeds 7.8 inches or falls below 1.1 inches.
The lowest average 31-day accumulation is 3.7 inches on April 10.
Average Monthly Rainfall in April
Over the course of April in Sam Rayburn, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 51 minutes, implying an average daily increase of 1 minute, 46 seconds, and weekly increase of 12 minutes, 25 seconds.
The shortest day of the month is April 1, with 12 hours, 31 minutes of daylight and the longest day is April 30, with 13 hours, 22 minutes of daylight.
Hours of Daylight and Twilight in April
The latest sunrise of the month in Sam Rayburn is 7:04 AM on April 1 and the earliest sunrise is 32 minutes earlier at 6:32 AM on April 30.
The earliest sunset is 7:35 PM on April 1 and the latest sunset is 19 minutes later at 7:54 PM on April 30.
Daylight saving time is observed in Sam Rayburn during 2018, but it neither starts nor ends during April, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:12 AM and sets 14 hours, 10 minutes later, at 8:23 PM, while on December 21, the shortest day of the year, it rises at 7:10 AM and sets 10 hours, 8 minutes later, at 5:18 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in April
The chance that a given day will be muggy in Sam Rayburn is very rapidly increasing during April, rising from 18% to 41% over the course of the month.
For reference, on July 23, the muggiest day of the year, there are muggy conditions 98% of the time, while on January 23, the least muggy day of the year, there are muggy conditions 4% of the time.
Humidity Comfort Levels in April
The average hourly wind speed in Sam Rayburn is essentially constant during April, remaining within 0.1 miles per hour of 4.9 miles per hour throughout.
For reference, on April 1, the windiest day of the year, the daily average wind speed is 5.0 miles per hour, while on July 30, the calmest day of the year, the daily average wind speed is 3.4 miles per hour.
The highest daily average wind speed during April is 5.0 miles per hour on April 1.
Average Wind Speed in April
Wind Direction in April
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.
The month of April in Sam Rayburn is very likely fully within the growing season, with the chance that a given day is in the growing season gradually increasing from 96% to 100% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in April
The average accumulated growing degree days in Sam Rayburn are rapidly increasing during April, increasing by 497°F, from 693°F to 1,191°F, over the course of the month.
Growing Degree Days in April
The average daily incident shortwave solar energy in Sam Rayburn is gradually increasing during April, rising by 0.7 kWh, from 5.7 kWh to 6.4 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in April
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 year round, 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 .