Average Weather in October in Galliano Louisiana, United States
Daily high temperatures decrease by 8°F, from 85°F to 76°F, rarely falling below 67°F or exceeding 90°F.
Daily low temperatures decrease by 9°F, from 67°F to 57°F, rarely falling below 45°F or exceeding 75°F.
For reference, on July 22, the hottest day of the year, temperatures in Galliano typically range from 74°F to 91°F, while on January 17, the coldest day of the year, they range from 46°F to 64°F.
Average High and Low Temperature in October
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. 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 October
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Ismailia, Egypt (6,835 miles away); Al Mindak, Saudi Arabia (7,741 miles); and Longmen, China (8,242 miles) are the far-away foreign places with temperatures most similar to Galliano (view comparison).
The month of October in Galliano experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 36% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 33% on October 25.
The clearest day of the month is October 25, with clear, mostly clear, or partly cloudy conditions 67% of the time.
For reference, on July 29, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 62%, while on October 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.
Cloud Cover Categories in October
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Galliano, the chance of a wet day over the course of October is rapidly decreasing, starting the month at 28% and ending it at 21%.
For reference, the year's highest daily chance of a wet day is 60% on July 28, and its lowest chance is 21% on October 29.
Probability of Precipitation in October
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 October in Galliano is gradually decreasing, starting the month at 3.7 inches, when it rarely exceeds 6.6 inches or falls below 1.0 inches, and ending the month at 3.4 inches, when it rarely exceeds 7.2 inches or falls below 0.6 inches.
The lowest average 31-day accumulation is 3.3 inches on October 17.
Average Monthly Rainfall in October
Over the course of October in Galliano, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 50 minutes, implying an average daily decrease of 1 minute, 40 seconds, and weekly decrease of 11 minutes, 43 seconds.
The shortest day of the month is October 31, with 11 hours, 1 minute of daylight and the longest day is October 1, with 11 hours, 51 minutes of daylight.
Hours of Daylight and Twilight in October
The earliest sunrise of the month in Galliano is 6:54 AM on October 1 and the latest sunrise is 19 minutes later at 7:14 AM on October 31.
The latest sunset is 6:46 PM on October 1 and the earliest sunset is 31 minutes earlier at 6:15 PM on October 31.
Daylight saving time is observed in Galliano during 2020, but it neither starts nor ends during October, so the entire month is in daylight saving time.
For reference, on June 20, the longest day of the year, the Sun rises at 6:01 AM and sets 14 hours, 2 minutes later, at 8:03 PM, while on December 21, the shortest day of the year, it rises at 6:51 AM and sets 10 hours, 16 minutes later, at 5:07 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in October
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy in Galliano is very rapidly decreasing during October, falling from 63% to 35% over the course of the month.
For reference, on July 21, the muggiest day of the year, there are muggy conditions 99% of the time, while on January 23, the least muggy day of the year, there are muggy conditions 9% of the time.
Humidity Comfort Levels in October
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Galliano is gradually increasing during October, increasing from 10.4 miles per hour to 11.0 miles per hour over the course of the month.
For reference, on March 6, the windiest day of the year, the daily average wind speed is 12.2 miles per hour, while on August 7, the calmest day of the year, the daily average wind speed is 7.2 miles per hour.
Average Wind Speed in October
The hourly average wind direction in Galliano throughout October is predominantly from the east, with a peak proportion of 47% on October 1.
Wind Direction in October
Galliano 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 Galliano is decreasing during October, falling by 6°F, from 80°F to 74°F, over the course of the month.
Average Water Temperature in October
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
The growing season in Galliano typically lasts for 11 months (321 days), from around February 2 to around December 19, rarely starting after March 3, or ending before November 22.
The month of October in Galliano is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in October
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
The average accumulated growing degree days in Galliano are rapidly increasing during October, increasing by 612°F, from 5,879°F to 6,491°F, over the course of the month.
Growing Degree Days in October
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy in Galliano is gradually decreasing during October, falling by 0.8 kWh, from 5.0 kWh to 4.2 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in October
For the purposes of this report, the geographical coordinates of Galliano are 29.442 deg latitude, -90.299 deg longitude, and 3 ft elevation.
The topography within 2 miles of Galliano is essentially flat, with a maximum elevation change of 10 feet and an average elevation above sea level of 3 feet. Within 10 miles is also essentially flat (23 feet). Within 50 miles is essentially flat (827 feet).
The area within 2 miles of Galliano is covered by cropland (54%), herbaceous vegetation (34%), and artificial surfaces (12%), within 10 miles by herbaceous vegetation (71%) and water (20%), and within 50 miles by water (51%) and herbaceous vegetation (42%).
This report illustrates the typical weather in Galliano 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Galliano.
For each station, the records are corrected for the elevation difference between that station and Galliano 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 Galliano is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Galliano and a given station.
The stations contributing to this reconstruction are: Galliano, South Lafourche Airport (97%, 3.7 kilometers, east) and Houma-Terrebonne Airport (3.0%, 38 kilometers, west).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.