Average Weather in Jasper Florida, United States

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4. Hamilton County
5. Jasper

In Jasper, 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 42°F to 91°F and is rarely below 27°F or above 96°F.

The hot season lasts for 4.4 months, from May 12 to September 25, with an average daily high temperature above 85°F. The hottest day of the year is July 15, with an average high of 91°F and low of 72°F.

The cool season lasts for 2.8 months, from December 2 to February 25, with an average daily high temperature below 69°F. The coldest day of the year is January 14, with an average low of 42°F and high of 64°F.

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.

In Jasper, 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 Jasper begins around September 17 and lasts for 8.6 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 3.4 months, ending around September 17. On July 12, the cloudiest day of the year, the sky is overcast or mostly cloudy 59% of the time, and clear, mostly clear, or partly cloudy 41% of the time.

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

The wetter season lasts 3.5 months, from May 30 to September 14, 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 8.5 months, from September 14 to May 30. The smallest chance of a wet day is 16% 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.

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. Jasper experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Jasper. The most rain falls during the 31 days centered around July 20, with an average total accumulation of 5.4 inches.

The least rain falls around November 7, with an average total accumulation of 2.2 inches.

The length of the day in Jasper varies significantly over the course of the year. In 2017, the shortest day is December 21, with 10 hours, 10 minutes of daylight; the longest day is June 21, with 14 hours, 7 minutes of daylight.

The earliest sunrise is at 6:28 AM on June 11, and the latest sunrise is 1 hour, 20 minutes later at 7:48 AM on November 4. The earliest sunset is at 5:30 PM on December 2, and the latest sunset is 3 hours, 8 minutes later at 8:38 PM on June 30.

Daylight saving time (DST) is observed in Jasper during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

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.

Jasper experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 5.5 months, from May 7 to October 24, during which time the comfort level is muggy, oppressive, or miserable at least 27% of the time. The muggiest day of the year is July 26, with muggy conditions 99% of the time.

The least muggy day of the year is January 29, with muggy conditions 2% of the time.

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

The windier part of the year lasts for 7.5 months, from October 1 to May 17, with average wind speeds of more than 2.7 miles per hour. The windiest day of the year is March 8, with an average hourly wind speed of 3.2 miles per hour.

The calmer time of year lasts for 4.5 months, from May 17 to October 1. The calmest day of the year is August 5, with an average hourly wind speed of 2.1 miles per hour.

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

The wind is most often from the west for 5.9 months, from February 20 to August 17, with a peak percentage of 41% on July 15. The wind is most often from the east for 2.3 months, from August 17 to October 25, with a peak percentage of 46% on September 8. The wind is most often from the north for 3.8 months, from October 25 to February 20, with a peak percentage of 34% on January 1.

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 2.7 months, from November 12 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.

For the purposes of this report, the geographical coordinates of Jasper are 30.518 deg latitude, -82.948 deg longitude, and 131 ft elevation.

The topography within 2 miles of Jasper is essentially flat, with a maximum elevation change of 75 feet and an average elevation above sea level of 126 feet. Within 10 miles is essentially flat (138 feet). Within 50 miles also contains only modest variations in elevation (269 feet).

The area within 2 miles of Jasper is covered by trees (55%), cropland (18%), and herbaceous vegetation (18%), within 10 miles by trees (55%) and herbaceous vegetation (20%), and within 50 miles by trees (49%) and herbaceous vegetation (30%).

This report illustrates the typical weather in Jasper, 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 6 weather stations near enough to contribute to our estimation of the temperature and dew point in Jasper.

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

The stations contributing to this reconstruction are: Valdosta Regional Airport (36%, 43 kilometers, northwest); Homerville Airport (21%, 62 kilometers, north); Perry Foley (15%, 78 kilometers, southwest); Cross City Airport (10%, 100 kilometers, south); Herlong Recreational Airport (10%, 104 kilometers, east); and Gainesville Regional Airport (9%, 112 kilometers, southeast).

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.