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Average Weather in Mandeville Louisiana, United States

In Mandeville, 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 43°F to 91°F and is rarely below 29°F or above 96°F.

Based on the tourism score, the best times of year to visit Mandeville for warm-weather activities are from early April to mid May and from late September to late October.

Climate Summary

coolcomfortablewarmhotwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec67%67%43%43%clearovercastprecipitation: 5.3 inprecipitation: 5.3 in3.3 in3.3 inmuggy: 99%muggy: 99%5%5%drydrytourism score: 6.3tourism score: 6.32.82.8
Click on each chart for more information.

Temperature

The hot season lasts for 4.2 months, from May 18 to September 26, with an average daily high temperature above 85°F. The hottest day of the year is August 9, with an average high of 91°F and low of 75°F.

The cool season lasts for 2.8 months, from December 1 to February 24, with an average daily high temperature below 68°F. The coldest day of the year is January 17, with an average low of 43°F and high of 62°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

Average Hourly Temperature in MandevilleJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMcoldcoldcoldcoldcoolcoolwarmhotcomfortablecomfortable
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
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

El Hamma, Tunisia (5,592 miles away); Fuzhou, China (8,090 miles); and Roxby Downs, Australia (9,672 miles) are the far-away foreign places with temperatures most similar to Mandeville (view comparison).

Clouds

In Mandeville, 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 Mandeville begins around September 12 and lasts for 3.1 months, ending around December 16. On October 26, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 67% of the time, and overcast or mostly cloudy 33% of the time.

The cloudier part of the year begins around December 16 and lasts for 8.9 months, ending around September 12. On July 29, the cloudiest day of the year, the sky is overcast or mostly cloudy 57% of the time, and clear, mostly clear, or partly cloudy 43% of the time.

Cloud Cover Categories

Cloud Cover Categories in MandevilleclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 2667%Oct 2667%Jul 2943%Jul 2943%Sep 1255%Sep 1255%Dec 1655%Dec 1655%clearpartly cloudymostly cloudyovercastmostly clear
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Mandeville varies significantly throughout the year.

The wetter season lasts 3.3 months, from June 1 to September 10, with a greater than 40% chance of a given day being a wet day. The chance of a wet day peaks at 58% on July 28.

The drier season lasts 8.7 months, from September 10 to June 1. The smallest chance of a wet day is 22% on October 29.

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 58% on July 28.

Daily Chance of Precipitation

Daily Chance of Precipitation in MandevillewetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 2858%Jul 2858%Oct 2922%Oct 2922%Jan 132%Jan 132%Jun 140%Jun 140%Sep 1040%Sep 1040%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

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. Mandeville experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Mandeville. The most rain falls during the 31 days centered around June 29, with an average total accumulation of 5.3 inches.

The least rain falls around October 15, with an average total accumulation of 3.3 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

The length of the day in Mandeville varies significantly over the course of the year. In 2018, the shortest day is December 21, with 10 hours, 11 minutes of daylight; the longest day is June 21, with 14 hours, 7 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in MandevilleJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2014 hr, 7 minJun 2114 hr, 7 minJun 2112 hr, 8 minSep 2212 hr, 8 minSep 2210 hr, 11 minDec 2110 hr, 11 minDec 21nightnightday
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:57 AM on June 10, and the latest sunrise is 1 hour, 19 minutes later at 7:16 AM on November 3. The earliest sunset is at 4:59 PM on December 2, and the latest sunset is 3 hours, 7 minutes later at 8:06 PM on June 30.

Daylight saving time (DST) is observed in Mandeville 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

Sunrise & Sunset with Twilight and Daylight Saving Time in MandevilleJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 105:57 AMJun 105:57 AM8:06 PMJun 308:06 PMJun 30Dec 24:59 PMDec 24:59 PM7:16 AMNov 37:16 AMNov 3Mar 11DSTMar 11DSTDSTNov 4DSTNov 4daynightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2018. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Humidity

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.

Mandeville experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 6.5 months, from April 12 to October 26, during which time the comfort level is muggy, oppressive, or miserable at least 28% of the time. The muggiest day of the year is July 23, with muggy conditions 99% of the time.

The least muggy day of the year is January 29, with muggy conditions 5% of the time.

Humidity Comfort Levels

Humidity Comfort Levels in MandevillemuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 295%Jan 295%99%Jul 2399%Jul 23Apr 1228%Apr 1228%Oct 2628%Oct 2628%miserablemiserableoppressiveoppressivedrydryhumidhumidmuggymuggy
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

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 Mandeville experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 7.7 months, from September 30 to May 20, with average wind speeds of more than 5.3 miles per hour. The windiest day of the year is March 7, with an average hourly wind speed of 6.5 miles per hour.

The calmer time of year lasts for 4.3 months, from May 20 to September 30. The calmest day of the year is August 8, with an average hourly wind speed of 4.2 miles per hour.

Average Wind Speed

Average Wind Speed in MandevillewindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mphMar 76.5 mphMar 76.5 mphAug 84.2 mphAug 84.2 mphSep 305.3 mphSep 305.3 mphMay 205.3 mphMay 205.3 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Mandeville varies throughout the year.

The wind is most often from the south for 4.8 months, from February 25 to July 19 and for 6.0 days, from August 15 to August 21, with a peak percentage of 49% on June 2. The wind is most often from the east for 2.8 months, from August 21 to November 14, with a peak percentage of 41% on September 20. The wind is most often from the north for 3.4 months, from November 14 to February 25, with a peak percentage of 38% on January 1.

Wind Direction

Wind Direction in MandevilleNSWENJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Mandeville 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 water temperature experiences significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.9 months, from May 29 to September 25, with an average temperature above 80°F. The day of the year with the warmest water is August 10, with an average temperature of 86°F.

The time of year with cooler water lasts for 3.5 months, from December 7 to March 22, with an average temperature below 65°F. The day of the year with the coolest water is February 3, with an average temperature of 60°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Mandeville 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 Mandeville for general outdoor tourist activities are from early April to mid May and from late September to late October, with a peak score in the last week of April.

Tourism Score

Tourism Score in Mandevillebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.36.32.82.86.26.23.83.8 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best times of year to visit Mandeville for hot-weather activities are from early May to late June and from late August to early October, with a peak score in the first week of June.

Beach/Pool Score

Beach/Pool Score in Mandevillebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468105.85.80.70.75.75.74.84.8 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

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.

Growing Season

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 Mandeville typically lasts for 9.9 months (301 days), from around February 15 to around December 13, rarely starting before January 20 or after March 14, and rarely ending before November 15 or after January 4.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Mandevillegrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Feb 1550%Feb 1550%Dec 1350%Dec 1390%Mar 1490%Mar 1490%Nov 1590%Nov 1510%Jan 2010%Jan 20Jul 12100%Jul 12100%coldcoolcomfortablewarmhotvery cold
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
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

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 Mandeville should appear around January 17, only rarely appearing before January 10 or after January 30.

Growing Degree Days

Growing Degree Days in MandevilleJanFebMarAprMayJunJulAugSepOctNovDec0°F1,000°F2,000°F3,000°F4,000°F5,000°F6,000°F7,000°FJan 1790°FJan 1790°FApr 8900°FApr 8900°FMay 201,800°FMay 201,800°FDec 316,872°FDec 316,872°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 2.9 months, from April 2 to June 30, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest day of the year is May 19, with an average of 6.6 kWh.

The darker period of the year lasts for 2.5 months, from November 16 to February 1, with an average daily incident shortwave energy per square meter below 3.7 kWh. The darkest day of the year is December 24, with an average of 3.0 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in MandevillebrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhMay 196.6 kWhMay 196.6 kWhDec 243.0 kWhDec 243.0 kWhApr 25.8 kWhApr 25.8 kWhJun 305.8 kWhJun 305.8 kWhFeb 13.7 kWhFeb 13.7 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Mandeville are 30.358 deg latitude, -90.066 deg longitude, and 7 ft elevation.

The topography within 2 miles of Mandeville is essentially flat, with a maximum elevation change of 23 feet and an average elevation above sea level of 7 feet. Within 10 miles is also essentially flat (52 feet). Within 50 miles is essentially flat (827 feet).

The area within 2 miles of Mandeville is covered by herbaceous vegetation (39%), water (36%), and artificial surfaces (19%), within 10 miles by water (41%) and herbaceous vegetation (26%), and within 50 miles by herbaceous vegetation (46%) and water (19%).

Data Sources

This report illustrates the typical weather in Mandeville, 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 Mandeville.

For each station, the records are corrected for the elevation difference between that station and Mandeville 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 Mandeville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Mandeville and a given station.

The stations contributing to this reconstruction are: Slidell Airport (42%, 24 kilometers, east); Lakefront Airport (24%, 35 kilometers, south); Hammond Northshore Regional Airport (21%, 38 kilometers, northwest); and George R Carr Memorial Air Field (12%, 54 kilometers, north).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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.

Disclaimer

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.