Average Weather in Delmar Delaware, United States
In Delmar, the summers are warm and muggy, the winters are very cold and windy, and it is wet and partly cloudy year round. Over the course of the year, the temperature typically varies from 27°F to 88°F and is rarely below 13°F or above 96°F.
Based on the tourism score, the best times of year to visit Delmar for warm-weather activities are from late May to late June and from mid August to early October.
The hot season lasts for 3.6 months, from May 30 to September 16, with an average daily high temperature above 79°F. The hottest day of the year is July 21, with an average high of 88°F and low of 69°F.
The cold season lasts for 3.0 months, from December 4 to March 5, with an average daily high temperature below 53°F. The coldest day of the year is January 30, with an average low of 27°F and high of 44°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 Delmar, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.
The clearer part of the year in Delmar begins around July 15 and lasts for 4.2 months, ending around November 22. On October 12, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 64% of the time, and overcast or mostly cloudy 36% of the time.
The cloudier part of the year begins around November 22 and lasts for 7.8 months, ending around July 15. On January 5, the cloudiest day of the year, the sky is overcast or mostly cloudy 51% of the time, and clear, mostly clear, or partly cloudy 49% 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 Delmar varies throughout the year.
The wetter season lasts 4.8 months, from April 1 to August 27, with a greater than 30% chance of a given day being a wet day. The chance of a wet day peaks at 38% on August 6.
The drier season lasts 7.1 months, from August 27 to April 1. The smallest chance of a wet day is 21% on October 20.
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 38% on August 6.
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. Delmar experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Delmar. The most rain falls during the 31 days centered around August 12, with an average total accumulation of 3.8 inches.
The least rain falls around January 30, with an average total accumulation of 2.4 inches.
Average Monthly Rainfall
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Delmar experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 3.8 months, from November 25 to March 19, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 26, with an average total liquid-equivalent accumulation of 0.4 inches.
The snowless period of the year lasts for 8.2 months, from March 19 to November 25. The least snow falls around July 18, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Delmar varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 29 minutes of daylight; the longest day is June 21, with 14 hours, 51 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:37 AM on June 13, and the latest sunrise is 1 hour, 53 minutes later at 7:30 AM on November 3. The earliest sunset is at 4:41 PM on December 7, and the latest sunset is 3 hours, 49 minutes later at 8:30 PM on June 28.
Daylight saving time (DST) is observed in Delmar 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
Delmar experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.4 months, from May 20 to October 1, during which time the comfort level is muggy, oppressive, or miserable at least 18% of the time. The muggiest day of the year is August 2, with muggy conditions 72% of the time.
The least muggy day of the year is February 14, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Delmar experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 7.0 months, from October 12 to May 14, with average wind speeds of more than 10.2 miles per hour. The windiest day of the year is February 26, with an average hourly wind speed of 12.4 miles per hour.
The calmer time of year lasts for 5.0 months, from May 14 to October 12. The calmest day of the year is August 13, with an average hourly wind speed of 7.9 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Delmar varies throughout the year.
The wind is most often from the north for 2.3 months, from January 22 to March 30 and for 1.5 months, from October 4 to November 20, with a peak percentage of 35% on January 29. The wind is most often from the south for 6.2 months, from March 30 to October 4, with a peak percentage of 41% on July 28. The wind is most often from the west for 2.1 months, from November 20 to January 22, with a peak percentage of 34% on January 1.
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 water temperature experiences significant seasonal variation over the course of the year.
The time of year with warmer water lasts for 3.5 months, from June 19 to October 3, with an average temperature above 69°F. The day of the year with the warmest water is August 7, with an average temperature of 76°F.
The time of year with cooler water lasts for 3.6 months, from December 21 to April 9, with an average temperature below 47°F. The day of the year with the coolest water is February 12, with an average temperature of 40°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Delmar 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 Delmar for general outdoor tourist activities are from late May to late June and from mid August to early October, with a peak score in the first week of September.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Delmar for hot-weather activities is from mid June to early September, with a peak score in the second week of August.
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 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.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Delmar should appear around March 10, only rarely appearing before February 21 or after March 29.
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 3.8 months, from April 24 to August 19, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest day of the year is June 23, with an average of 7.0 kWh.
The darker period of the year lasts for 3.1 months, from November 7 to February 9, with an average daily incident shortwave energy per square meter below 3.0 kWh. The darkest day of the year is December 20, with an average of 2.1 kWh.
Average Daily Incident Shortwave Solar Energy
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, 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.
For each station, the records are corrected for the elevation difference between that station and Delmar 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 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.
The stations contributing to this reconstruction are: Salisbury–Ocean City–Wicomico Regional Airport (67%, 14 kilometers, southeast); Sussex County Airport (19%, 32 kilometers, northeast); and Cambridge-Dorchester Airport (14%, 41 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .