Average Weather in June in Delmar Delaware, United States
Daily high temperatures increase by 6°F, from 80°F to 86°F, rarely falling below 69°F or exceeding 94°F.
Daily low temperatures increase by 7°F, from 59°F to 66°F, rarely falling below 48°F or exceeding 74°F.
For reference, on July 21, the hottest day of the year, temperatures in Delmar typically range from 69°F to 88°F, while on January 30, the coldest day of the year, they range from 27°F to 44°F.
Average High and Low Temperature in June
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on June. 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.
The month of June in Delmar experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 46% throughout the month.
The clearest day of the month is June 25, with clear, mostly clear, or partly cloudy conditions 55% of the time.
For reference, on January 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 51%, while on October 12, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 64%.
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Delmar, the chance of a wet day over the course of June is gradually increasing, starting the month at 32% and ending it at 36%.
For reference, the year's highest daily chance of a wet day is 38% on August 7, and its lowest chance is 21% on October 20.
Probability of Precipitation in June
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
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 June in Delmar is essentially constant, remaining about 3.2 inches throughout, and rarely exceeding 5.8 inches or falling below 1.2 inches.
Average Monthly Rainfall in June
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.
Over the course of June in Delmar, the length of the day is essentially constant. The shortest day of the month is June 1, with 14 hours, 40 minutes of daylight and the longest day is June 21, with 14 hours, 51 minutes of daylight.
Hours of Daylight and Twilight in June
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
The earliest sunrise of the month in Delmar is 5:37 AM on June 14 and the latest sunrise is 4 minutes later at 5:41 AM on June 30.
The earliest sunset is 8:20 PM on June 1 and the latest sunset is 10 minutes later at 8:30 PM on June 28.
Daylight saving time is observed in Delmar during 2019, but it neither starts nor ends during June, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:38 AM and sets 14 hours, 51 minutes later, at 8:29 PM, while on December 22, the shortest day of the year, it rises at 7:16 AM and sets 9 hours, 29 minutes later, at 4:45 PM.
Sunrise & Sunset with Twilight in June
The solar day over the course of June. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.
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 Delmar is very rapidly increasing during June, rising from 31% to 58% over the course of the month.
For reference, on August 2, the muggiest day of the year, there are muggy conditions 72% of the time, while on January 24, the least muggy day of the year, there are muggy conditions 0% of the time.
The percentage of time spent at various humidity comfort levels, categorized by dew point.
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 Delmar is gradually decreasing during June, decreasing from 9.4 miles per hour to 8.4 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 12.4 miles per hour, while on August 13, the calmest day of the year, the daily average wind speed is 7.9 miles per hour.
Average Wind Speed in June
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The hourly average wind direction in Delmar throughout June is predominantly from the south, with a peak proportion of 40% on June 30.
Wind Direction in June
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).
Delmar 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 Delmar is rapidly increasing during June, rising by 9°F, from 63°F to 72°F, over the course of the month.
Average Water Temperature in June
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
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).
The growing season in Delmar typically lasts for 6.5 months (198 days), from around April 11 to around October 26, rarely starting before March 24 or after April 30, and rarely ending before October 9 or after November 12.
The month of June in Delmar is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in June
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within 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.
The average accumulated growing degree days in Delmar are rapidly increasing during June, increasing by 651°F, from 851°F to 1,502°F, over the course of the month.
Growing Degree Days in June
The average growing degree days accumulated over the course of June, with 25th to 75th and 10th to 90th percentile bands.
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 Delmar is essentially constant during June, remaining within 0.1 kWh of 6.9 kWh throughout.
The highest average daily incident shortwave solar energy during June is 7.0 kWh on June 23.
Average Daily Incident Shortwave Solar Energy in June
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
For the purposes of this report, the geographical coordinates of Delmar are 38.457 deg latitude, -75.577 deg longitude, and 43 ft elevation.
The topography within 2 miles of Delmar is essentially flat, with a maximum elevation change of 30 feet and an average elevation above sea level of 44 feet. Within 10 miles is essentially flat (125 feet). Within 50 miles also contains only modest variations in elevation (138 feet).
The area within 2 miles of Delmar is covered by cropland (61%), artificial surfaces (25%), and trees (13%), within 10 miles by cropland (57%) and trees (32%), and within 50 miles by water (47%) and cropland (26%).
This report illustrates the typical weather in Delmar 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Delmar.
The estimated value at Delmar is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Delmar and a given station.
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.
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.