Average Weather in Jacksonville Florida, United States
In Jacksonville, 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 46°F to 90°F and is rarely below 32°F or above 95°F.
The hot season lasts for 4.0 months, from May 21 to September 20, with an average daily high temperature above 85°F. The hottest day of the year is July 16, with an average high of 90°F and low of 75°F.
The cool season lasts for 2.9 months, from December 1 to February 27, with an average daily high temperature below 70°F. The coldest day of the year is January 17, with an average low of 46°F and high of 65°F.
Average High and Low Temperature
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 Jacksonville, 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 Jacksonville begins around September 20 and lasts for 8.5 months, ending around June 6. 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 6 and lasts for 3.5 months, ending around September 20. 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
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Jacksonville varies significantly throughout the year.
The wetter season lasts 3.8 months, from June 2 to September 27, with a greater than 38% chance of a given day being a wet day. The chance of a wet day peaks at 59% on July 31.
The drier season lasts 8.2 months, from September 27 to June 2. 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 59% on July 31.
Daily Chance of Precipitation
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. Jacksonville experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Jacksonville. The most rain falls during the 31 days centered around September 6, with an average total accumulation of 5.2 inches.
The least rain falls around November 11, with an average total accumulation of 1.9 inches.
Average Monthly Rainfall
The length of the day in Jacksonville varies significantly over the course of the year. In 2017, the shortest day is December 21, with 10 hours, 11 minutes of daylight; the longest day is June 21, with 14 hours, 6 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:24 AM on June 11, and the latest sunrise is 1 hour, 19 minutes later at 7:43 AM on November 4. The earliest sunset is at 5:25 PM on December 2, and the latest sunset is 3 hours, 7 minutes later at 8:32 PM on June 30.
Daylight saving time (DST) is observed in Jacksonville during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
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.
Jacksonville experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 6.0 months, from May 2 to November 3, during which time the comfort level is muggy, oppressive, or miserable at least 27% of the time. The muggiest day of the year is August 5, with muggy conditions 99% of the time.
The least muggy day of the year is January 29, with muggy conditions 2% of the time.
Humidity Comfort Levels
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 Jacksonville experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 8.6 months, from September 13 to June 1, with average wind speeds of more than 3.5 miles per hour. The windiest day of the year is February 26, with an average hourly wind speed of 4.2 miles per hour.
The calmer time of year lasts for 3.4 months, from June 1 to September 13. The calmest day of the year is August 6, with an average hourly wind speed of 3.0 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Jacksonville varies throughout the year.
The wind is most often from the east for 2.5 months, from March 29 to June 14 and for 2.1 months, from August 14 to October 18, with a peak percentage of 49% on September 8. The wind is most often from the south for 2.0 months, from June 14 to August 14, with a peak percentage of 42% on July 19. The wind is most often from the north for 3.4 months, from October 18 to February 2, with a peak percentage of 34% on January 1.
Jacksonville 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 some seasonal variation over the course of the year.
The time of year with warmer water lasts for 4.1 months, from June 7 to October 10, with an average temperature above 79°F. The day of the year with the warmest water is August 25, with an average temperature of 83°F.
The time of year with cooler water lasts for 3.8 months, from December 16 to April 10, with an average temperature below 68°F. The day of the year with the coolest water is February 21, with an average temperature of 64°F.
Average Water Temperature
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 2.4 months, from April 3 to June 14, 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 2.8 months, from November 10 to February 4, 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
For the purposes of this report, the geographical coordinates of Jacksonville are 30.332 deg latitude, -81.656 deg longitude, and 13 ft elevation.
The topography within 2 miles of Jacksonville is essentially flat, with a maximum elevation change of 39 feet and an average elevation above sea level of 11 feet. Within 10 miles is also essentially flat (92 feet). Within 50 miles is essentially flat (285 feet).
The area within 2 miles of Jacksonville is covered by artificial surfaces (89%) and water (10%), within 10 miles by artificial surfaces (67%) and herbaceous vegetation (13%), and within 50 miles by water (32%) and trees (32%).
This report illustrates the typical weather in Jacksonville, 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 Jacksonville.
For each station, the records are corrected for the elevation difference between that station and Jacksonville 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 Jacksonville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Jacksonville and a given station.
The stations contributing to this reconstruction are: Jacksonville, Naval Air Station (39%, 11 kilometers, south); Craig Municipal Airport (29%, 14 kilometers, east); Jacksonville International Airport (18%, 18 kilometers, north); and Herlong Recreational Airport (14%, 22 kilometers, west).
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.