Average Weather in January in Galveston Texas, United States
Daily high temperatures are around 61°F, rarely falling below 49°F or exceeding 71°F. The lowest daily average high temperature is 61°F on January 6.
Daily low temperatures are around 49°F, rarely falling below 37°F or exceeding 62°F. The lowest daily average low temperature is 49°F on January 6.
For reference, on August 5, the hottest day of the year, temperatures in Galveston typically range from 80°F to 90°F, while on January 6, the coldest day of the year, they range from 49°F to 61°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 Galveston experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 47% throughout the month. The highest chance of overcast or mostly cloudy conditions is 48% on January 3.
The clearest day of the month is January 31, with clear, mostly clear, or partly cloudy conditions 54% of the time.
For reference, on August 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 53%, while on October 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 69%.
Cloud Cover Categories in January
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Galveston, the chance of a wet day over the course of January is essentially constant, remaining around 27% throughout.
For reference, the year's highest daily chance of a wet day is 42% on September 4, and its lowest chance is 22% on April 1.
Probability of Precipitation in January
The average sliding 31-day rainfall during January in Galveston is gradually decreasing, starting the month at 3.9 inches, when it rarely exceeds 7.2 inches or falls below 1.1 inches, and ending the month at 3.6 inches, when it rarely exceeds 6.7 inches or falls below 1.1 inches.
Average Monthly Rainfall in January
Over the course of January in Galveston, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 29 minutes, implying an average daily increase of 58 seconds, and weekly increase of 6 minutes, 48 seconds.
The shortest day of the month is January 1, with 10 hours, 19 minutes of daylight and the longest day is January 31, with 10 hours, 48 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Galveston is 7:14 AM on January 11 and the earliest sunrise is 6 minutes earlier at 7:08 AM on January 31.
The earliest sunset is 5:32 PM on January 1 and the latest sunset is 24 minutes later at 5:56 PM on January 31.
Daylight saving time is observed in Galveston 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 6:20 AM and sets 14 hours, 1 minute later, at 8:21 PM, while on December 21, the shortest day of the year, it rises at 7:09 AM and sets 10 hours, 16 minutes later, at 5:25 PM.
Sunrise & Sunset with Twilight in January
The chance that a given day will be muggy in Galveston is gradually decreasing during January, falling from 7% to 4% over the course of the month.
The lowest chance of a muggy day during January is 4% on January 23.
For reference, on July 16, the muggiest day of the year, there are muggy conditions 100% 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 Galveston is essentially constant during January, remaining within 0.1 miles per hour of 12.0 miles per hour throughout.
For reference, on December 25, the windiest day of the year, the daily average wind speed is 12.2 miles per hour, while on August 15, the calmest day of the year, the daily average wind speed is 8.4 miles per hour.
Average Wind Speed in January
Wind Direction in January
Galveston is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature in Galveston is gradually decreasing during January, falling by 2°F, from 62°F to 60°F, over the course of the month.
The lowest average surface water temperature during January is 60°F on January 31.
Average Water Temperature in January
While it does not do so every year, freezing temperatures are seen in Galveston over some winters. The day least likely to be in the growing season is January 16, with a 64% chance.
Time Spent in Various Temperature Bands and the Growing Season in January
The average accumulated growing degree days in Galveston are increasing during January, increasing by 187°F, from 0°F to 188°F, over the course of the month.
Growing Degree Days in January
The average daily incident shortwave solar energy in Galveston is gradually increasing during January, rising by 0.6 kWh, from 3.0 kWh to 3.6 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 Galveston are 29.301 deg latitude, -94.798 deg longitude, and 3 ft elevation.
The topography within 2 miles of Galveston is essentially flat, with a maximum elevation change of 20 feet and an average elevation above sea level of 5 feet. Within 10 miles is also essentially flat (26 feet). Within 50 miles is essentially flat (112 feet).
The area within 2 miles of Galveston is covered by artificial surfaces (54%), water (25%), and bare soil (11%), within 10 miles by water (80%), and within 50 miles by water (57%) and cropland (19%).
This report illustrates the typical weather in Galveston 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 Galveston.
For each station, the records are corrected for the elevation difference between that station and Galveston 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 Galveston is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Galveston and a given station.
The stations contributing to this reconstruction are: Scholes Field (90%, 7 kilometers, southwest); Galveston Coast Guard Station (9%, 30 kilometers, southeast); and Beaumont Municipal Airport (1.5%, 102 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .