Average Weather in Jefferson Texas, United States
In Jefferson, 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 38°F to 94°F and is rarely below 25°F or above 100°F.
Based on the tourism score, the best times of year to visit Jefferson for warm-weather activities are from mid April to mid June and from early September to mid October.
The hot season lasts for 3.7 months, from June 1 to September 21, with an average daily high temperature above 87°F. The hottest day of the year is July 31, with an average high of 94°F and low of 73°F.
The cool season lasts for 2.9 months, from November 26 to February 23, with an average daily high temperature below 64°F. The coldest day of the year is January 7, with an average low of 38°F and high of 56°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 Jefferson, 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 Jefferson begins around June 1 and lasts for 5.5 months, ending around November 16. On October 5, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 72% of the time, and overcast or mostly cloudy 28% of the time.
The cloudier part of the year begins around November 16 and lasts for 6.5 months, ending around June 1. On February 16, 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
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Jefferson varies throughout the year.
The wetter season lasts 3.7 months, from March 14 to July 3, with a greater than 29% chance of a given day being a wet day. The chance of a wet day peaks at 36% on June 8.
The drier season lasts 8.3 months, from July 3 to March 14. The smallest chance of a wet day is 22% on September 20.
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 36% on June 8.
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. Jefferson experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Jefferson. The most rain falls during the 31 days centered around October 31, with an average total accumulation of 4.3 inches.
The least rain falls around August 15, with an average total accumulation of 2.1 inches.
Average Monthly Rainfall
The sliding 31-day liquid-equivalent quantity of snowfall in Jefferson does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Jefferson varies significantly over the course of the year. In 2018, the shortest day is December 21, with 10 hours, 0 minutes of daylight; the longest day is June 21, with 14 hours, 19 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:08 AM on June 12, and the latest sunrise is 1 hour, 28 minutes later at 7:36 AM on November 3. The earliest sunset is at 5:10 PM on December 4, and the latest sunset is 3 hours, 19 minutes later at 8:29 PM on June 29.
Daylight saving time (DST) is observed in Jefferson 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
Jefferson experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 5.5 months, from April 29 to October 11, during which time the comfort level is muggy, oppressive, or miserable at least 24% of the time. The muggiest day of the year is July 14, with muggy conditions 94% of the time.
The least muggy day of the year is January 28, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Jefferson experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 7.1 months, from October 19 to May 22, with average wind speeds of more than 5.0 miles per hour. The windiest day of the year is April 1, with an average hourly wind speed of 6.0 miles per hour.
The calmer time of year lasts for 4.9 months, from May 22 to October 19. The calmest day of the year is July 30, with an average hourly wind speed of 4.0 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Jefferson is from the south throughout the year.
Best Time of Year to Visit
To characterize how pleasant the weather is in Jefferson 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 Jefferson for general outdoor tourist activities are from mid April to mid June and from early September to mid October, with a peak score in the first week of October.
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 Jefferson for hot-weather activities is from late May to mid September, with a peak score in the last 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 Jefferson typically lasts for 8.3 months (255 days), from around March 10 to around November 20, rarely starting before February 13 or after April 2, and rarely ending before October 30 or after December 10.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Jefferson should appear around January 28, only rarely appearing before January 17 or after February 14.
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 4.6 months, from April 10 to August 29, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is June 16, with an average of 6.7 kWh.
The darker period of the year lasts for 2.8 months, from November 12 to February 5, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest day of the year is December 23, with an average of 2.7 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Jefferson are 32.757 deg latitude, -94.345 deg longitude, and 190 ft elevation.
The topography within 2 miles of Jefferson contains only modest variations in elevation, with a maximum elevation change of 131 feet and an average elevation above sea level of 204 feet. Within 10 miles also contains only modest variations in elevation (259 feet). Within 50 miles contains only modest variations in elevation (535 feet).
The area within 2 miles of Jefferson is covered by herbaceous vegetation (36%), trees (35%), shrubs (14%), and cropland (11%), within 10 miles by trees (58%) and herbaceous vegetation (24%), and within 50 miles by trees (44%) and cropland (34%).
This report illustrates the typical weather in Jefferson, 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 Jefferson.
For each station, the records are corrected for the elevation difference between that station and Jefferson 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 Jefferson is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Jefferson and a given station.
The stations contributing to this reconstruction are: Harrison County Airport (57%, 27 kilometers, south); Gilmer, Fox Stephens Field - Gilmer Municipal Airport (18%, 57 kilometers, west); Mount Pleasant, Mount Pleasant Regional Airport (14%, 69 kilometers, northwest); and Texarkana Regional Airport (10%, 84 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .