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Average Weather in Macclenny Florida, United States

In Macclenny, the summers are long, hot, oppressive, and mostly cloudy; the winters are short, cool, and partly cloudy; and it is wet year round. Over the course of the year, the temperature typically varies from 44°F to 91°F and is rarely below 30°F or above 96°F.

Climate Summary

comfortablewarmhotwarmcomfortableJanFebMarAprMayJunJulAugSepOctNovDec66%66%38%38%clearovercastprecipitation: 5.5 inprecipitation: 5.5 in1.9 in1.9 inmuggy: 100%muggy: 100%2%2%drydrytourism score: 6.4tourism score: 6.43.53.5
Click on each chart for more information.

Based on the tourism score, the best times of year to visit Macclenny for warm-weather activities are from late March to late May and from early October to early November.

Temperature

The hot season lasts for 4.1 months, from May 18 to September 20, with an average daily high temperature above 86°F. The hottest day of the year is July 17, with an average high of 91°F and low of 73°F.

The cool season lasts for 3.0 months, from November 30 to February 26, with an average daily high temperature below 70°F. The coldest day of the year is January 17, with an average low of 44°F and high of 65°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 MacclennyJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMcoldcoldcoldcoldcoolcoolcomfortablewarmwarmhot
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.

Al Hadā, Saudi Arabia (7,216 miles away) is the far-away foreign place with temperatures most similar to Macclenny (view comparison).

Clouds

In Macclenny, 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 Macclenny begins around September 19 and lasts for 8.5 months, ending around June 5. On October 27, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 66% of the time, and overcast or mostly cloudy 34% of the time.

The cloudier part of the year begins around June 5 and lasts for 3.5 months, ending around September 19. On July 12, the cloudiest day of the year, the sky is overcast or mostly cloudy 62% of the time, and clear, mostly clear, or partly cloudy 38% of the time.

Cloud Cover Categories

Cloud Cover Categories in MacclennyclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 2766%Oct 2766%Jul 1238%Jul 1238%Sep 1952%Sep 1952%Jun 553%Jun 553%clearpartly cloudymostly cloudyovercastmostly clear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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

The wetter season lasts 3.6 months, from June 1 to September 18, with a greater than 41% chance of a given day being a wet day. The chance of a wet day peaks at 65% on July 30.

The drier season lasts 8.4 months, from September 18 to June 1. The smallest chance of a wet day is 17% on October 31.

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 65% on July 30.

Daily Chance of Precipitation

Daily Chance of Precipitation in MacclennywetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 3065%Jul 3065%Oct 3117%Oct 3117%Jan 122%Jan 122%Jun 141%Jun 141%Sep 1841%Sep 1841%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. Macclenny experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Macclenny. The most rain falls during the 31 days centered around June 28, with an average total accumulation of 5.5 inches.

The least rain falls around November 11, with an average total accumulation of 1.9 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 Macclenny varies significantly over the course of the year. In 2018, the shortest day is December 21, with 10 hours, 12 minutes of daylight; the longest day is June 21, with 14 hours, 6 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in MacclennyJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 2012 hr, 8 minMar 2014 hr, 6 minJun 2114 hr, 6 minJun 2112 hr, 8 minSep 2212 hr, 8 minSep 2210 hr, 12 minDec 2110 hr, 12 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 6:26 AM on June 10, and the latest sunrise is 1 hour, 18 minutes later at 7:44 AM on November 3. The earliest sunset is at 5:27 PM on December 2, and the latest sunset is 3 hours, 7 minutes later at 8:34 PM on June 30.

Daylight saving time (DST) is observed in Macclenny 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 MacclennyJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 106:26 AMJun 106:26 AM8:34 PMJun 308:34 PMJun 30Dec 25:27 PMDec 25:27 PM7:44 AMNov 37:44 AMNov 3Mar 11DSTMar 11DSTDSTNov 4DSTNov 4daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
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.

Macclenny experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 5.7 months, from May 5 to October 27, during which time the comfort level is muggy, oppressive, or miserable at least 26% of the time. The muggiest day of the year is August 5, with muggy conditions 100% of the time.

The least muggy day of the year is January 30, with muggy conditions 2% of the time.

Humidity Comfort Levels

Humidity Comfort Levels in MacclennymuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 302%Jan 302%100%Aug 5100%Aug 5May 526%May 526%Oct 2726%Oct 2726%miserablemiserableoppressiveoppressivedrydryhumidhumidmuggymuggycomfortablecomfortable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

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

The windier part of the year lasts for 8.1 months, from September 27 to May 31, with average wind speeds of more than 4.9 miles per hour. The windiest day of the year is March 9, with an average hourly wind speed of 5.8 miles per hour.

The calmer time of year lasts for 3.9 months, from May 31 to September 27. The calmest day of the year is August 5, with an average hourly wind speed of 4.0 miles per hour.

Average Wind Speed

Average Wind Speed in MacclennywindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mphMar 95.8 mphMar 95.8 mphAug 54.0 mphAug 54.0 mphSep 274.9 mphSep 274.9 mphMay 314.9 mphMay 314.9 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 Macclenny varies throughout the year.

The wind is most often from the west for 2.6 months, from January 31 to April 18 and for 2.0 months, from June 13 to August 14, with a peak percentage of 38% on July 16. The wind is most often from the east for 1.8 months, from April 18 to June 13 and for 2.1 months, from August 14 to October 17, with a peak percentage of 47% on September 8. The wind is most often from the north for 3.5 months, from October 17 to January 31, with a peak percentage of 34% on January 1.

Wind Direction

Wind Direction in MacclennyNWEWENJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsoutheastnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

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

Tourism Score

Tourism Score in Macclennybest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.46.43.53.56.46.43.83.8 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 Macclenny for hot-weather activities are from early May to early July and from late August to mid October, with a peak score in the last week of May.

Beach/Pool Score

Beach/Pool Score in Macclennybest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468105.75.71.01.05.65.64.84.8 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 Macclenny typically lasts for 9.6 months (291 days), from around February 19 to around December 7, rarely starting before January 25 or after March 15, and rarely ending before November 13 or after January 1.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Macclennygrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Feb 1950%Feb 1950%Dec 750%Dec 790%Mar 1590%Mar 1590%Nov 1390%Nov 1310%Jan 2510%Jan 2510%Jan 110%Jan 1Jul 16100%Jul 16100%coldcoolcomfortablewarmhotvery cold
The percentage of time spent in various temperature bands: 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 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 Macclenny should appear around January 14, only rarely appearing before January 9 or after January 23.

Growing Degree Days

Growing Degree Days in MacclennyJanFebMarAprMayJunJulAugSepOctNovDec0°F1,000°F2,000°F3,000°F4,000°F5,000°F6,000°F7,000°FJan 1490°FJan 1490°FApr 5900°FApr 5900°FMay 201,800°FMay 201,800°FDec 316,786°FDec 316,786°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 2.3 months, from April 4 to June 12, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest day of the year is May 1, with an average of 6.7 kWh.

The darker period of the year lasts for 2.7 months, from November 12 to February 3, with an average daily incident shortwave energy per square meter below 3.8 kWh. The darkest day of the year is December 21, with an average of 3.1 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in MacclennybrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhMay 16.7 kWhMay 16.7 kWhDec 213.1 kWhDec 213.1 kWhJun 126.0 kWhJun 126.0 kWhFeb 33.8 kWhFeb 33.8 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 Macclenny are 30.282 deg latitude, -82.122 deg longitude, and 125 ft elevation.

The topography within 2 miles of Macclenny is essentially flat, with a maximum elevation change of 66 feet and an average elevation above sea level of 120 feet. Within 10 miles is essentially flat (171 feet). Within 50 miles also contains only modest variations in elevation (285 feet).

The area within 2 miles of Macclenny is covered by trees (41%), artificial surfaces (31%), and herbaceous vegetation (18%), within 10 miles by trees (72%) and herbaceous vegetation (16%), and within 50 miles by trees (47%) and herbaceous vegetation (30%).

Data Sources

This report illustrates the typical weather in Macclenny, 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 Macclenny.

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

The stations contributing to this reconstruction are: Naval Air Station Cecil Field (historical) (39%, 24 kilometers, east); Herlong Recreational Airport (39%, 24 kilometers, east); Keystone Airpark (13%, 49 kilometers, south); Homerville Airport (4.3%, 106 kilometers, northwest); and Waycross-Ware County Airport (4.0%, 111 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.