Average Weather in May in Wilmington Manor Delaware, United States
In Wilmington Manor, the month of May is characterized by rising daily high temperatures, with daily highs increasing by 8°F, from 69°F to 77°F over the course of the month, and rarely exceeding 87°F or dropping below 58°F.
Daily low temperatures increase by 10°F, from 50°F to 60°F, rarely falling below 41°F or exceeding 68°F.
For reference, on July 21, the hottest day of the year, temperatures in Wilmington Manor typically range from 70°F to 86°F, while on January 30, the coldest day of the year, they range from 26°F to 40°F.
Average High and Low Temperature in May
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. The horizontal axis is the day, 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 May
The month of May in Wilmington Manor experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 48% throughout the month.
The clearest day of the month is May 1, with clear, mostly clear, or partly cloudy conditions 53% of the time.
For reference, on December 24, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 53%, while on September 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 64%.
Cloud Cover in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Wilmington Manor, the chance of a wet day over the course of May is increasing, starting the month at 30% and ending it at 35%.
For reference, the year's highest daily chance of a wet day is 38% on July 15, and its lowest chance is 22% on October 20.
Probability of Precipitation in May
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during May in Wilmington Manor is essentially constant, remaining about 3.4 inches throughout, and rarely exceeding 6.1 inches or falling below 1.6 inches.
The lowest average 31-day accumulation is 3.3 inches on May 3.
Average Monthly Rainfall in May
Over the course of May in Wilmington Manor, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 53 minutes, implying an average daily increase of 1 minute, 46 seconds, and weekly increase of 12 minutes, 19 seconds.
The shortest day of the month is May 1, with 13 hours, 54 minutes of daylight and the longest day is May 31, with 14 hours, 47 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Wilmington Manor is 6:02 AM on May 1 and the earliest sunrise is 26 minutes earlier at 5:36 AM on May 31.
The earliest sunset is 7:56 PM on May 1 and the latest sunset is 27 minutes later at 8:23 PM on May 31.
Daylight saving time is observed in Wilmington Manor during 2017, but it neither starts nor ends during May, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:34 AM and sets 14 hours, 59 minutes later, at 8:33 PM, while on December 21, the shortest day of the year, it rises at 7:19 AM and sets 9 hours, 22 minutes later, at 4:41 PM.
Sunrise & Sunset with Twilight in May
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.
The chance that a given day will be muggy in Wilmington Manor is rapidly increasing during May, rising from 2% to 21% over the course of the month.
For reference, on July 29, the muggiest day of the year, there are muggy conditions 63% of the time, while on January 8, the leasy muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in May
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 Wilmington Manor is gradually decreasing during May, decreasing from 4.4 miles per hour to 3.7 miles per hour over the course of the month.
For reference, on February 26, the windiest day of the year, the daily average wind speed is 5.2 miles per hour, while on August 12, the calmest day of the year, the daily average wind speed is 3.1 miles per hour.
Average Wind Speed in May
Wind Direction in May
Wilmington Manor 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 surface water temperature in Wilmington Manor is rapidly increasing during May, rising by 9°F, from 52°F to 61°F, over the course of the month.
Average Water Temperature in May
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 in Wilmington Manor is gradually increasing during May, rising by 0.5 kWh, from 6.0 kWh to 6.6 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in May
For the purposes of this report, the geographical coordinates of Wilmington Manor are 39.687 deg latitude, -75.584 deg longitude, and 16 ft elevation.
The topography within 2 miles of Wilmington Manor is essentially flat, with a maximum elevation change of 75 feet and an average elevation above sea level of 33 feet. Within 10 miles is essentially flat (440 feet). Within 50 miles contains only modest variations in elevation (1,112 feet).
The area within 2 miles of Wilmington Manor is covered by artificial surfaces (100%), within 10 miles by artificial surfaces (51%) and trees (19%), and within 50 miles by cropland (35%) and trees (30%).
This report illustrates the typical weather in Wilmington Manor year round, 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 Wilmington Manor.
For each station, the records are corrected for the elevation difference between that station and Wilmington Manor 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 Wilmington Manor is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Wilmington Manor and a given station.
The stations contributing to this reconstruction are: New Castle Airport (95%, 2.1 kilometers, southwest); Philadelphia International Airport (2.1%, 36 kilometers, northeast); Chester County G O Carlson Airport (1.5%, 41 kilometers, northwest); and Millville Municipal Airport (1.1%, 57 kilometers, southeast).
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.