Average Weather in July in Marcus Hook Pennsylvania, United States
Daily high temperatures are around 86°F, rarely falling below 77°F or exceeding 94°F. The highest daily average high temperature is 86°F on July 21.
Daily low temperatures increase by 2°F, from 68°F to 70°F, rarely falling below 60°F or exceeding 76°F. The highest daily average low temperature is 70°F on July 21.
For reference, on July 21, the hottest day of the year, temperatures in Marcus Hook 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 July
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on July. 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 July
The month of July in Marcus Hook experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 43% to 39%.
The clearest day of the month is July 30, with clear, mostly clear, or partly cloudy conditions 61% of the time.
For reference, on January 5, 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 65%.
Cloud Cover Categories in July
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Marcus Hook, the chance of a wet day over the course of July is gradually increasing, starting the month at 35% and ending it at 37%.
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 July
The average sliding 31-day rainfall during July in Marcus Hook is essentially constant, remaining about 3.6 inches throughout, and rarely exceeding 6.2 inches or falling below 1.5 inches.
The highest average 31-day accumulation is 3.6 inches on July 26.
Average Monthly Rainfall in July
Over the course of July in Marcus Hook, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 40 minutes, implying an average daily decrease of 1 minute, 20 seconds, and weekly decrease of 9 minutes, 20 seconds.
The shortest day of the month is July 31, with 14 hours, 17 minutes of daylight and the longest day is July 1, with 14 hours, 57 minutes of daylight.
Hours of Daylight and Twilight in July
The earliest sunrise of the month in Marcus Hook is 5:37 AM on July 1 and the latest sunrise is 22 minutes later at 5:59 AM on July 31.
The latest sunset is 8:33 PM on July 1 and the earliest sunset is 18 minutes earlier at 8:16 PM on July 31.
Daylight saving time is observed in Marcus Hook during 2019, but it neither starts nor ends during July, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:33 AM and sets 15 hours, 0 minutes later, at 8:33 PM, while on December 22, the shortest day of the year, it rises at 7:19 AM and sets 9 hours, 21 minutes later, at 4:40 PM.
Sunrise & Sunset with Twilight in July
The chance that a given day will be muggy in Marcus Hook is rapidly increasing during July, rising from 47% to 61% over the course of the month.
The highest chance of a muggy day during July is 61% on July 29.
For reference, on July 29, the muggiest day of the year, there are muggy conditions 61% of the time, while on January 8, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in July
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Marcus Hook is essentially constant during July, remaining within 0.2 miles per hour of 5.7 miles per hour throughout.
For reference, on February 26, the windiest day of the year, the daily average wind speed is 9.2 miles per hour, while on August 13, the calmest day of the year, the daily average wind speed is 5.4 miles per hour.
Average Wind Speed in July
Wind Direction in July
Marcus Hook 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 Marcus Hook is increasing during July, rising by 4°F, from 70°F to 74°F, over the course of the month.
Average Water Temperature in July
The growing season in Marcus Hook typically lasts for 7.2 months (221 days), from around April 2 to around November 9, rarely starting before March 17 or after April 18, and rarely ending before October 21 or after November 26.
The month of July in Marcus Hook is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in July
The average accumulated growing degree days in Marcus Hook are rapidly increasing during July, increasing by 802°F, from 1,371°F to 2,173°F, over the course of the month.
Growing Degree Days in July
The average daily incident shortwave solar energy in Marcus Hook is essentially constant during July, remaining within 0.2 kWh of 6.6 kWh throughout.
Average Daily Incident Shortwave Solar Energy in July
For the purposes of this report, the geographical coordinates of Marcus Hook are 39.819 deg latitude, -75.419 deg longitude, and 26 ft elevation.
The topography within 2 miles of Marcus Hook contains only modest variations in elevation, with a maximum elevation change of 135 feet and an average elevation above sea level of 39 feet. Within 10 miles also contains only modest variations in elevation (479 feet). Within 50 miles contains only modest variations in elevation (1,250 feet).
The area within 2 miles of Marcus Hook is covered by artificial surfaces (64%) and water (35%), within 10 miles by artificial surfaces (53%) and trees (21%), and within 50 miles by trees (34%) and cropland (31%).
This report illustrates the typical weather in Marcus Hook 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 Marcus Hook.
For each station, the records are corrected for the elevation difference between that station and Marcus Hook 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 Marcus Hook is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Marcus Hook and a given station.
The stations contributing to this reconstruction are: Philadelphia International Airport (48%, 17 kilometers, east); New Castle Airport (33%, 23 kilometers, southwest); Chester County G O Carlson Airport (11%, 42 kilometers, northwest); and Millville Municipal Airport (8%, 58 kilometers, southeast).
Time zones for aiports and weather stations are provided by AskGeo.com .