Average Weather in Palm Harbor Florida, United States
In Palm Harbor, the summers are long, hot, oppressive, and mostly cloudy; the winters are short, cool, windy, and partly cloudy; and it is wet year round. Over the course of the year, the temperature typically varies from 54°F to 89°F and is rarely below 43°F or above 93°F.
Based on the tourism score, the best times of year to visit Palm Harbor for warm-weather activities are from early March to mid May and from mid October to early December.
The hot season lasts for 4.5 months, from May 19 to October 4, with an average daily high temperature above 85°F. The hottest day of the year is August 9, with an average high of 89°F and low of 78°F.
The cool season lasts for 2.8 months, from December 6 to March 1, with an average daily high temperature below 73°F. The coldest day of the year is January 18, with an average low of 54°F and high of 69°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 Palm Harbor, 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 Palm Harbor begins around October 1 and lasts for 8.2 months, ending around June 8. On May 1, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 65% of the time, and overcast or mostly cloudy 35% of the time.
The cloudier part of the year begins around June 8 and lasts for 3.8 months, ending around October 1. On July 10, the cloudiest day of the year, the sky is overcast or mostly cloudy 68% of the time, and clear, mostly clear, or partly cloudy 32% 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 Palm Harbor varies very significantly throughout the year.
The wetter season lasts 3.5 months, from June 5 to September 22, with a greater than 43% chance of a given day being a wet day. The chance of a wet day peaks at 71% on July 31.
The drier season lasts 8.5 months, from September 22 to June 5. The smallest chance of a wet day is 14% on November 25.
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 71% 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. Palm Harbor experiences extreme seasonal variation in monthly rainfall.
Rain falls throughout the year in Palm Harbor. The most rain falls during the 31 days centered around August 14, with an average total accumulation of 6.9 inches.
The least rain falls around November 11, with an average total accumulation of 1.8 inches.
Average Monthly Rainfall
The length of the day in Palm Harbor varies over the course of the year. In 2018, the shortest day is December 21, with 10 hours, 22 minutes of daylight; the longest day is June 21, with 13 hours, 56 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:33 AM on June 10, and the latest sunrise is 1 hour, 11 minutes later at 7:45 AM on March 11. The earliest sunset is at 5:34 PM on December 1, and the latest sunset is 2 hours, 57 minutes later at 8:31 PM on July 1.
Daylight saving time (DST) is observed in Palm Harbor 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
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.
Palm Harbor experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 7.3 months, from April 9 to November 18, during which time the comfort level is muggy, oppressive, or miserable at least 33% of the time. The muggiest day of the year is August 8, with muggy conditions 100% of the time.
The least muggy day of the year is January 30, with muggy conditions 11% 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 Palm Harbor experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 7.8 months, from September 17 to May 11, with average wind speeds of more than 8.8 miles per hour. The windiest day of the year is January 29, with an average hourly wind speed of 10.9 miles per hour.
The calmer time of year lasts for 4.2 months, from May 11 to September 17. The calmest day of the year is July 20, with an average hourly wind speed of 6.6 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Palm Harbor varies throughout the year.
The wind is most often from the east for 2.5 months, from March 17 to May 31 and for 2.6 months, from August 13 to October 31, with a peak percentage of 51% on September 24. The wind is most often from the west for 2.4 months, from May 31 to August 13, with a peak percentage of 38% on July 6. The wind is most often from the north for 4.5 months, from October 31 to March 17, with a peak percentage of 37% on January 1.
Palm Harbor 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 4.0 months, from June 7 to October 8, with an average temperature above 81°F. The day of the year with the warmest water is August 11, with an average temperature of 86°F.
The time of year with cooler water lasts for 3.2 months, from December 18 to March 26, with an average temperature below 68°F. The day of the year with the coolest water is February 4, with an average temperature of 64°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Palm Harbor 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 Palm Harbor for general outdoor tourist activities are from early March to mid May and from mid October to early December, with a peak score in the second week of April.
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 Palm Harbor for hot-weather activities are from late April to early June and for the entire month of October, with a peak score in the third week of May.
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).
Temperatures in Palm Harbor are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.
Time Spent in Various Temperature Bands and 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.
Growing Degree Days
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 2.0 months, from April 3 to June 3, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest day of the year is May 1, with an average of 6.8 kWh.
The darker period of the year lasts for 2.5 months, from November 12 to January 30, with an average daily incident shortwave energy per square meter below 4.1 kWh. The darkest day of the year is December 21, with an average of 3.4 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Palm Harbor are 28.078 deg latitude, -82.764 deg longitude, and 7 ft elevation.
The topography within 2 miles of Palm Harbor is essentially flat, with a maximum elevation change of 79 feet and an average elevation above sea level of 27 feet. Within 10 miles is essentially flat (98 feet). Within 50 miles also contains only modest variations in elevation (295 feet).
The area within 2 miles of Palm Harbor is covered by artificial surfaces (71%) and water (21%), within 10 miles by water (45%) and artificial surfaces (41%), and within 50 miles by water (58%) and artificial surfaces (18%).
This report illustrates the typical weather in Palm Harbor, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Palm Harbor.
For each station, the records are corrected for the elevation difference between that station and Palm Harbor 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 Palm Harbor is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Palm Harbor and a given station.
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.
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.