Summer Weather in Martha's Vineyard Island Massachusetts, United States
Daily high temperatures increase by 7°F, from 68°F to 76°F, rarely falling below 60°F or exceeding 85°F. The highest daily average high temperature is 79°F on July 28.
Daily low temperatures increase by 7°F, from 53°F to 60°F, rarely falling below 44°F or exceeding 72°F. The highest daily average low temperature is 64°F on August 2.
For reference, on July 25, the hottest day of the year, temperatures in Martha's Vineyard Island typically range from 64°F to 79°F, while on January 30, the coldest day of the year, they range from 24°F to 38°F.
Average High and Low Temperature in the Summer in Martha's Vineyard Island
The figure below shows you a compact characterization of the hourly average summer temperatures. 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 the Summer in Martha's Vineyard Island
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The summer in Martha's Vineyard Island experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 52% to 37%.
The clearest day of the summer is August 31, with clear, mostly clear, or partly cloudy conditions 63% of the time.
For reference, on May 24, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 53%, while on September 6, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 63%.
Cloud Cover Categories in the Summer in Martha's Vineyard Island
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 Martha's Vineyard Island, the chance of a wet day over the course of the summer is decreasing, starting the season at 28% and ending it at 22%.
For reference, the year's highest daily chance of a wet day is 31% on December 11, and its lowest chance is 21% on July 4.
Probability of Precipitation in the Summer in Martha's Vineyard Island
To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during the summer in Martha's Vineyard Island is essentially constant, remaining about 2.7 inches throughout, and rarely exceeding 5.9 inches or falling below 0.8 inches.
The lowest average 31-day accumulation is 2.4 inches on July 8.
Average Monthly Rainfall in the Summer in Martha's Vineyard Island
Over the course of the summer in Martha's Vineyard Island, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 48 minutes, implying an average daily decrease of 1 minute, 11 seconds, and weekly decrease of 8 minutes, 20 seconds.
The shortest day of the summer is August 31, with 13 hours, 10 minutes of daylight and the longest day is June 21, with 15 hours, 11 minutes of daylight.
Hours of Daylight and Twilight in the Summer in Martha's Vineyard Island
The earliest sunrise of the summer in Martha's Vineyard Island is 5:08 AM on June 15 and the latest sunrise is 59 minutes later at 6:07 AM on August 31.
The latest sunset is 8:20 PM on June 27 and the earliest sunset is 1 hour, 3 minutes earlier at 7:17 PM on August 31.
Daylight saving time is observed in Martha's Vineyard Island during 2023, but it neither starts nor ends during the summer, so the entire season is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:08 AM and sets 15 hours, 11 minutes later, at 8:19 PM, while on December 22, the shortest day of the year, it rises at 7:05 AM and sets 9 hours, 11 minutes later, at 4:16 PM.
Sunrise & Sunset with Twilight in the Summer in Martha's Vineyard Island
The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.
Solar Elevation and Azimuth in the Summer in Martha's Vineyard Island
The figure below presents a compact representation of key lunar data for the summer of 2023. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in the Summer in Martha's Vineyard Island
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 Martha's Vineyard Island is very rapidly increasing during the summer, rising from 2% to 31% over the course of the season.
The highest chance of a muggy day during the summer is 53% on August 2.
For reference, on August 2, the muggiest day of the year, there are muggy conditions 53% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in the Summer in Martha's Vineyard Island
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Martha's Vineyard Island is gradually decreasing during the summer, decreasing from 12.6 miles per hour to 11.8 miles per hour over the course of the season.
For reference, on January 13, the windiest day of the year, the daily average wind speed is 17.5 miles per hour, while on July 25, the calmest day of the year, the daily average wind speed is 11.2 miles per hour.
The lowest daily average wind speed during the summer is 11.2 miles per hour on August 13.
Average Wind Speed in the Summer in Martha's Vineyard Island
The wind direction in Martha's Vineyard Island during the summer is predominantly out of the west from June 1 to July 22 and from August 23 to August 31 and the south from July 22 to August 23.
Wind Direction in the Summer in Martha's Vineyard Island
Martha's Vineyard Island 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 Martha's Vineyard Island is very rapidly increasing during the summer, rising by 12°F, from 55°F to 67°F, over the course of the season.
The highest average surface water temperature during the summer is 69°F on August 11.
Average Water Temperature in the Summer in Martha's Vineyard Island
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 Martha's Vineyard Island typically lasts for 6.2 months (190 days), from around April 25 to around November 1, rarely starting before April 3 or after May 15, and rarely ending before October 13 or after November 19.
The summer in Martha's Vineyard Island is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in the Summer in Martha's Vineyard Island
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
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 Martha's Vineyard Island are very rapidly increasing during the summer, increasing by 1,655°F, from 284°F to 1,939°F, over the course of the season.
Growing Degree Days in the Summer in Martha's Vineyard Island
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 Martha's Vineyard Island is gradually decreasing during the summer, falling by 1.0 kWh, from 6.6 kWh to 5.6 kWh, over the course of the season.
The highest average daily incident shortwave solar energy during the summer is 7.1 kWh on June 30.
Average Daily Incident Shortwave Solar Energy in the Summer in Martha's Vineyard Island
For the purposes of this report, the geographical coordinates of Martha's Vineyard Island are 41.417 deg latitude, -70.616 deg longitude, and 0 ft elevation.
The topography within 2 miles of Martha's Vineyard Island is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).
The area within 2 miles of Martha's Vineyard Island is covered by trees (88%), within 10 miles by water (72%) and trees (23%), and within 50 miles by water (77%) and trees (13%).
This report illustrates the typical weather in Martha's Vineyard Island, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
The details of the data sources used for this report can be found on the Martha's Vineyard Airport page.
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.
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