Average Weather in January in Sam Rayburn Texas, United States
Daily high temperatures are around 61°F, rarely falling below 45°F or exceeding 74°F. The lowest daily average high temperature is 60°F on January 6.
Daily low temperatures are around 41°F, rarely falling below 28°F or exceeding 59°F. The lowest daily average low temperature is 41°F on January 7.
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 January
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. 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 January
The month of January in Sam Rayburn experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 48% throughout the month. The highest chance of overcast or mostly cloudy conditions is 49% on January 3.
The clearest day of the month is January 16, with clear, mostly clear, or partly cloudy conditions 53% 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 January
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 January is essentially constant, remaining around 28% throughout.
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 January
The average sliding 31-day rainfall during January in Sam Rayburn is essentially constant, remaining about 4.2 inches throughout, and rarely exceeding 8.0 inches or falling below 1.3 inches.
Average Monthly Rainfall in January
Over the course of January 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 31 minutes, implying an average daily increase of 1 minute, 3 seconds, and weekly increase of 7 minutes, 21 seconds.
The shortest day of the month is January 1, with 10 hours, 11 minutes of daylight and the longest day is January 31, with 10 hours, 42 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Sam Rayburn is 7:15 AM on January 9 and the earliest sunrise is 7 minutes earlier at 7:08 AM on January 31.
The earliest sunset is 5:25 PM on January 1 and the latest sunset is 26 minutes later at 5:50 PM on January 31.
Daylight saving time is observed in Sam Rayburn during 2018, but it neither starts nor ends during January, so the entire month is in standard 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 in January
The chance that a given day will be muggy in Sam Rayburn is essentially constant during January, remaining within 1% of 5% throughout.
The lowest chance of a muggy day during January is 4% on January 23.
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 January
The average hourly wind speed in Sam Rayburn is essentially constant during January, remaining within 0.1 miles per hour of 4.6 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 lowest daily average wind speed during January is 4.5 miles per hour on January 9.
Average Wind Speed in January
Wind Direction in January
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 January in Sam Rayburn is very likely fully outside of the growing season, with the chance that a given day is in the growing season reaching a low of 1% on January 9.
Time Spent in Various Temperature Bands and the Growing Season in January
The average accumulated growing degree days in Sam Rayburn are gradually increasing during January, increasing by 143°F, from 0°F to 143°F, over the course of the month.
Growing Degree Days in January
The average daily incident shortwave solar energy in Sam Rayburn is gradually increasing during January, rising by 0.6 kWh, from 2.9 kWh to 3.5 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in January
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 .