Climate and Average Weather Year Round in Byram Mississippi, United States
In Byram, the summers are long, hot, and oppressive; the winters are short and cold; and it is wet and partly cloudy year round. Over the course of the year, the temperature typically varies from 38°F to 91°F and is rarely below 24°F or above 97°F.
Based on the tourism score, the best times of year to visit Byram for warm-weather activities are from mid April to early June and from early September to late October.
Climate in Byram
Average Temperature in Byram
The hot season lasts for 4.1 months, from May 21 to September 24, with an average daily high temperature above 85°F. The hottest day of the year is July 22, with an average high of 91°F and low of 73°F.
The cool season lasts for 2.8 months, from November 30 to February 22, with an average daily high temperature below 64°F. The coldest day of the year is January 16, with an average low of 38°F and high of 58°F.
Average High and Low Temperature in Byram
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 Byram
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
In Byram, 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 Byram begins around August 2 and lasts for 3.7 months, ending around November 24. On October 12, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 69% of the time, and overcast or mostly cloudy 31% of the time.
The cloudier part of the year begins around November 24 and lasts for 8.3 months, ending around August 2. On January 3, the cloudiest day of the year, the sky is overcast or mostly cloudy 51% of the time, and clear, mostly clear, or partly cloudy 49% of the time.
Cloud Cover Categories in Byram
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. The chance of wet days in Byram varies throughout the year.
The wetter season lasts 4.8 months, from March 30 to August 22, with a greater than 34% chance of a given day being a wet day. The chance of a wet day peaks at 45% on July 9.
The drier season lasts 7.2 months, from August 22 to March 30. The smallest chance of a wet day is 22% on October 8.
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 45% on July 9.
Daily Chance of Precipitation in Byram
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. Byram experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Byram. The most rain falls during the 31 days centered around February 15, with an average total accumulation of 5.4 inches.
The least rain falls around September 13, with an average total accumulation of 3.0 inches.
Average Monthly Rainfall in Byram
The length of the day in Byram varies significantly over the course of the year. In 2021, the shortest day is December 21, with 10 hours, 2 minutes of daylight; the longest day is June 20, with 14 hours, 16 minutes of daylight.
Hours of Daylight and Twilight in Byram
The earliest sunrise is at 5:53 AM on June 11, and the latest sunrise is 1 hour, 28 minutes later at 7:22 AM on November 6. The earliest sunset is at 4:55 PM on December 3, and the latest sunset is 3 hours, 16 minutes later at 8:11 PM on June 29.
Daylight saving time (DST) is observed in Byram during 2021, starting in the spring on March 14, lasting 7.8 months, and ending in the fall on November 7.
Sunrise & Sunset with Twilight and Daylight Saving Time in Byram
The figure below presents a compact representation of key lunar data for 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.
Moon Rise, Set & Phases in Byram
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.
Byram experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 5.5 months, from April 27 to October 13, during which time the comfort level is muggy, oppressive, or miserable at least 25% of the time. The muggiest day of the year is July 23, with muggy conditions 96% of the time.
The least muggy day of the year is January 29, with muggy conditions 1% of the time.
Humidity Comfort Levels in Byram
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 Byram experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 7.4 months, from October 4 to May 16, with average wind speeds of more than 4.7 miles per hour. The windiest day of the year is February 25, with an average hourly wind speed of 5.8 miles per hour.
The calmer time of year lasts for 4.6 months, from May 16 to October 4. The calmest day of the year is July 29, with an average hourly wind speed of 3.5 miles per hour.
Average Wind Speed in Byram
The predominant average hourly wind direction in Byram varies throughout the year.
The wind is most often from the south for 6.1 months, from February 20 to August 22 and for 2.1 months, from October 16 to December 18, with a peak percentage of 51% on May 15. The wind is most often from the east for 1.2 months, from August 22 to September 28, with a peak percentage of 35% on September 9. The wind is most often from the north for 2.6 weeks, from September 28 to October 16 and for 2.1 months, from December 18 to February 20, with a peak percentage of 33% on October 7.
Wind Direction in Byram
Best Time of Year to Visit
To characterize how pleasant the weather is in Byram 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 Byram for general outdoor tourist activities are from mid April to early June and from early September to late October, with a peak score in the first week of October.
Tourism Score in Byram
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 Byram for hot-weather activities is from late May to late September, with a peak score in the last week of August.
Beach/Pool Score in Byram
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.
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 Byram typically lasts for 8.2 months (250 days), from around March 11 to around November 16, rarely starting before February 14 or after April 4, and rarely ending before October 28 or after December 6.
Time Spent in Various Temperature Bands and the Growing Season in Byram
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.
Based on growing degree days alone, the first spring blooms in Byram should appear around January 25, only rarely appearing before January 14 or after February 10.
Growing Degree Days in Byram
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 experiences significant seasonal variation over the course of the year.
The brighter period of the year lasts for 4.4 months, from April 6 to August 20, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is June 2, with an average of 6.6 kWh.
The darker period of the year lasts for 2.6 months, from November 15 to February 3, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest day of the year is December 25, with an average of 2.7 kWh.
Average Daily Incident Shortwave Solar Energy in Byram
For the purposes of this report, the geographical coordinates of Byram are 32.179 deg latitude, -90.245 deg longitude, and 262 ft elevation.
The topography within 2 miles of Byram contains only modest variations in elevation, with a maximum elevation change of 105 feet and an average elevation above sea level of 265 feet. Within 10 miles also contains only modest variations in elevation (259 feet). Within 50 miles contains only modest variations in elevation (581 feet).
The area within 2 miles of Byram is covered by cropland (37%), herbaceous vegetation (27%), artificial surfaces (25%), and trees (12%), within 10 miles by trees (40%) and cropland (32%), and within 50 miles by trees (54%) and cropland (25%).
This report illustrates the typical weather in Byram, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Byram.
For each station, the records are corrected for the elevation difference between that station and Byram 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 Byram is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Byram and a given station.
The stations contributing to this reconstruction are: Hawkins Field (KHKS, 37%, 18 kilometers, north); John Bell Williams Airport (KJVW, 29%, 21 kilometers, northwest); Jackson-Evers International Airport (KJAN, 26%, 22 kilometers, northeast); Brookhaven Lincoln County Airport (K1R7, 5%, 66 kilometers, south); and Hattiesburg–Laurel Regional Airport (KPIB, 2.2%, 117 kilometers, southeast).
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 airports 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.