Average Weather in December in Baytown Texas, United States
Daily high temperatures decrease by 5°F, from 68°F to 62°F, rarely falling below 48°F or exceeding 78°F.
Daily low temperatures decrease by 5°F, from 52°F to 47°F, rarely falling below 34°F or exceeding 65°F.
For reference, on August 5, the hottest day of the year, temperatures in Baytown typically range from 77°F to 92°F, while on January 6, the coldest day of the year, they range from 46°F to 62°F.
Average High and Low Temperature in December
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. 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 December
The month of December in Baytown experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 39% to 47%.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 61% of the time.
For reference, on August 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 51%, 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 December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Baytown, the chance of a wet day over the course of December is essentially constant, remaining around 26% throughout.
For reference, the year's highest daily chance of a wet day is 40% on June 24, and its lowest chance is 22% on April 1.
Probability of Precipitation in December
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during December in Baytown is gradually decreasing, starting the month at 3.9 inches, when it rarely exceeds 7.2 inches or falls below 1.3 inches, and ending the month at 3.6 inches, when it rarely exceeds 6.4 inches or falls below 1.1 inches.
Average Monthly Rainfall in December
Over the course of December in Baytown, the length of the day is essentially constant. The shortest day of the month is December 21, with 10 hours, 14 minutes of daylight and the longest day is December 1, with 10 hours, 23 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Baytown is 6:57 AM on December 1 and the latest sunrise is 17 minutes later at 7:14 AM on December 31.
The earliest sunset is 5:20 PM on December 2 and the latest sunset is 11 minutes later at 5:31 PM on December 31.
Daylight saving time is observed in Baytown during 2018, but it neither starts nor ends during December, 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, 3 minutes later, at 8:23 PM, while on December 21, the shortest day of the year, it rises at 7:11 AM and sets 10 hours, 14 minutes later, at 5:25 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Baytown is decreasing during December, falling from 17% to 9% over the course of the month.
For reference, on July 20, the muggiest day of the year, there are muggy conditions 99% of the time, while on January 29, the least muggy day of the year, there are muggy conditions 5% of the time.
Humidity Comfort Levels in December
The average hourly wind speed in Baytown is essentially constant during December, remaining within 0.1 miles per hour of 9.3 miles per hour throughout.
For reference, on April 11, the windiest day of the year, the daily average wind speed is 9.8 miles per hour, while on August 15, the calmest day of the year, the daily average wind speed is 6.6 miles per hour.
The highest daily average wind speed during December is 9.4 miles per hour on December 26.
Average Wind Speed in December
Wind Direction in December
Baytown 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 Baytown is decreasing during December, falling by 5°F, from 66°F to 61°F, over the course of the month.
Average Water Temperature in December
The growing season in Baytown typically lasts for 11 months (341 days), from around January 25 to around January 1, rarely starting after March 6, or ending before December 5.
The month of December in Baytown is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly decreasing from 93% to 51% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Baytown are increasing during December, increasing by 248°F, from 7,070°F to 7,319°F, over the course of the month.
Growing Degree Days in December
The average daily incident shortwave solar energy in Baytown is essentially constant during December, remaining within 0.1 kWh of 3.1 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 3.0 kWh on December 24.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Baytown are 29.736 deg latitude, -94.977 deg longitude, and 20 ft elevation.
The topography within 2 miles of Baytown is essentially flat, with a maximum elevation change of 36 feet and an average elevation above sea level of 20 feet. Within 10 miles is also essentially flat (79 feet). Within 50 miles is essentially flat (289 feet).
The area within 2 miles of Baytown is covered by artificial surfaces (90%), within 10 miles by artificial surfaces (43%) and water (26%), and within 50 miles by cropland (28%) and herbaceous vegetation (24%).
This report illustrates the typical weather in Baytown 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Baytown.
For each station, the records are corrected for the elevation difference between that station and Baytown 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 Baytown is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Baytown and a given station.
The stations contributing to this reconstruction are: Ellington Field (57%, 23 kilometers, southwest); George Bush Intercontinental Airport (19%, 46 kilometers, northwest); Scholes Field (16%, 53 kilometers, south); and Beaumont Municipal Airport (8%, 82 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .