Average Weather in Deltona Florida, United States
In Deltona, the summers are long, hot, oppressive, wet, and mostly cloudy and the winters are short, cool, and partly cloudy. Over the course of the year, the temperature typically varies from 49°F to 90°F and is rarely below 35°F or above 94°F.
Based on the tourism score, the best times of year to visit Deltona for warm-weather activities are from mid March to mid May and from mid October to late November.
The hot season lasts for 4.1 months, from May 18 to September 23, with an average daily high temperature above 86°F. The hottest day of the year is July 23, with an average high of 90°F and low of 74°F.
The cool season lasts for 2.8 months, from December 4 to February 26, with an average daily high temperature below 73°F. The coldest day of the year is January 15, with an average low of 49°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 Deltona, 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 Deltona begins around September 28 and lasts for 8.3 months, ending around June 6. 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 6 and lasts for 3.7 months, ending around September 28. On July 11, the cloudiest day of the year, the sky is overcast or mostly cloudy 67% of the time, and clear, mostly clear, or partly cloudy 33% 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 Deltona varies significantly throughout the year.
The wetter season lasts 4.0 months, from May 29 to September 30, with a greater than 41% chance of a given day being a wet day. The chance of a wet day peaks at 65% on August 10.
The drier season lasts 8.0 months, from September 30 to May 29. The smallest chance of a wet day is 17% on November 21.
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 August 10.
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. Deltona experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Deltona. The most rain falls during the 31 days centered around June 26, with an average total accumulation of 5.7 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 Deltona varies over the course of the year. In 2018, the shortest day is December 21, with 10 hours, 18 minutes of daylight; the longest day is June 21, with 13 hours, 59 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:25 AM on June 10, and the latest sunrise is 1 hour, 13 minutes later at 7:39 AM on March 11. The earliest sunset is at 5:27 PM on December 1, and the latest sunset is 3 hours, 1 minute later at 8:27 PM on July 1.
Daylight saving time (DST) is observed in Deltona 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
Deltona experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 6.4 months, from April 27 to November 10, during which time the comfort level is muggy, oppressive, or miserable at least 28% of the time. The muggiest day of the year is August 1, with muggy conditions 100% of the time.
The least muggy day of the year is January 30, with muggy conditions 5% of the time.
Humidity Comfort Levels
The average hourly wind speed in Deltona experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 8.2 months, from September 29 to June 4, with average wind speeds of more than 7.1 miles per hour. The windiest day of the year is March 10, with an average hourly wind speed of 8.7 miles per hour.
The calmer time of year lasts for 3.8 months, from June 4 to September 29. The calmest day of the year is August 4, with an average hourly wind speed of 5.5 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Deltona varies throughout the year.
The wind is most often from the east for 3.5 months, from March 13 to June 28 and for 2.5 months, from August 9 to October 23, with a peak percentage of 50% on September 24. The wind is most often from the south for 1.4 months, from June 28 to August 9, with a peak percentage of 36% on July 19. The wind is most often from the north for 3.8 months, from October 23 to February 17, with a peak percentage of 35% on January 1.
Deltona 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 10 to October 14, with an average temperature above 79°F. The day of the year with the warmest water is August 30, with an average temperature of 82°F.
The time of year with cooler water lasts for 3.7 months, from December 19 to April 11, with an average temperature below 71°F. The day of the year with the coolest water is February 25, with an average temperature of 68°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Deltona 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 Deltona for general outdoor tourist activities are from mid March to mid May and from mid October to late November, with a peak score in the last 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 Deltona for hot-weather activities are from late April to mid June and from mid September to mid 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.
The growing season in Deltona typically lasts for 11 months (345 days), from around January 23 to around January 3, rarely starting after February 25, or ending before December 16.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Deltona should appear around January 10, only rarely appearing before January 7 or after January 16.
Growing Degree Days
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 2.1 months, from April 3 to June 7, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest day of the year is May 2, with an average of 6.8 kWh.
The darker period of the year lasts for 2.7 months, from November 10 to February 1, with an average daily incident shortwave energy per square meter below 4.0 kWh. The darkest day of the year is December 21, with an average of 3.3 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Deltona are 28.901 deg latitude, -81.264 deg longitude, and 46 ft elevation.
The topography within 2 miles of Deltona is essentially flat, with a maximum elevation change of 92 feet and an average elevation above sea level of 54 feet. Within 10 miles is essentially flat (98 feet). Within 50 miles also contains only modest variations in elevation (305 feet).
The area within 2 miles of Deltona is covered by artificial surfaces (97%), within 10 miles by artificial surfaces (44%) and herbaceous vegetation (35%), and within 50 miles by herbaceous vegetation (27%) and water (27%).
This report illustrates the typical weather in Deltona, 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 Deltona.
For each station, the records are corrected for the elevation difference between that station and Deltona 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 Deltona is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Deltona and a given station.
The stations contributing to this reconstruction are: Orlando Sanford International Airport (50%, 14 kilometers, south); DeLand Municipal Airport-Sidney H Taylor Field (31%, 19 kilometers, north); New Smyrna Beach Municipal Airport (12%, 35 kilometers, northeast); and Leesburg International Airport (6%, 54 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .