Fall Weather in Edgartown United States

Daily high temperatures decrease by 26°F, from 74°F to 48°F, rarely falling below 38°F or exceeding 80°F.

Daily low temperatures decrease by 25°F, from 60°F to 35°F, rarely falling below 24°F or exceeding 69°F.

For reference, on July 24, the hottest day of the year, temperatures in Edgartown typically range from 64°F to 78°F, while on January 30, the coldest day of the year, they range from 25°F to 38°F.

The figure below shows you a compact characterization of the hourly average fall 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.

Çaykara, Turkey (5,305 miles away) is the far-away foreign place with temperatures most similar to Edgartown (view comparison).

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The fall in Edgartown experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 37% to 49%. The lowest chance of overcast or mostly cloudy conditions is 37% on September 5.

The clearest day of the fall is September 5, with clear, mostly clear, or partly cloudy conditions 63% of the time.

For reference, on May 23, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on September 5, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 63%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Edgartown, the chance of a wet day over the course of the fall is rapidly increasing, starting the season at 22% and ending it at 28%.

For reference, the year's highest daily chance of a wet day is 31% on December 10, and its lowest chance is 20% on July 3.

Over the course of the fall in Edgartown, the chance of a day with only rain increases from 22% to 27%, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout.

Rainfall

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 fall in Edgartown is increasing, starting the season at 3.0 inches, when it rarely exceeds 5.7 inches or falls below 1.1 inches, and ending the season at 3.8 inches, when it rarely exceeds 6.2 inches or falls below 1.6 inches.

The highest average 31-day accumulation is 3.8 inches on November 26.

Over the course of the fall in Edgartown, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 3 hours, 40 minutes, implying an average daily decrease of 2 minutes, 27 seconds, and weekly decrease of 17 minutes, 6 seconds.

The shortest day of the fall is November 30, with 9 hours, 25 minutes of daylight and the longest day is September 1, with 13 hours, 5 minutes of daylight.

The earliest sunrise of the fall in Edgartown is 6:08 AM on September 1 and the latest sunrise is 1 hour, 7 minutes later at 7:15 AM on November 2.

The latest sunset is 7:14 PM on September 1 and the earliest sunset is 3 hours, 1 minute earlier at 4:13 PM on November 30.

Daylight saving time (DST) starts at 1:00 AM on November 3, 2024, shifting sunrise and sunset to be an hour later.

For reference, on June 20, the longest day of the year, the Sun rises at 5:08 AM and sets 15 hours, 10 minutes later, at 8:18 PM, while on December 21, the shortest day of the year, it rises at 7:05 AM and sets 9 hours, 11 minutes later, at 4:15 PM.

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.

The figure below presents a compact representation of key lunar data for the fall of 2024. 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.

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 Edgartown is very rapidly decreasing during the fall, falling from 29% to 0% over the course of the season.

For reference, on August 1, 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.

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 Edgartown is very rapidly increasing during the fall, increasing from 12.0 miles per hour to 17.0 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 17.8 miles per hour, while on July 24, the calmest day of the year, the daily average wind speed is 11.3 miles per hour.

The wind direction in Edgartown during the fall is predominantly out of the south from September 1 to September 17 and the west from September 17 to November 30.

Edgartown 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 Edgartown is very rapidly decreasing during the fall, falling by 17°F, from 67°F to 50°F, over the course of the season.

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 Edgartown typically lasts for 6.6 months (200 days), from around April 19 to around November 5, rarely starting before March 28 or after May 10, and rarely ending before October 19 or after November 24.

During the fall in Edgartown, the chance that a given day is within the growing season is very rapidly decreasing falling from 100% to 5% over the course of the 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 Edgartown are rapidly increasing during the fall, increasing by 679°F, from 1,928°F to 2,606°F, over the course of the season.

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 Edgartown is very rapidly decreasing during the fall, falling by 3.7 kWh, from 5.6 kWh to 1.9 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Edgartown are 41.389 deg latitude, -70.513 deg longitude, and 3 ft elevation.

The topography within 2 miles of Edgartown is essentially flat, with a maximum elevation change of 82 feet and an average elevation above sea level of 12 feet. Within 10 miles is essentially flat (266 feet). Within 50 miles also contains only modest variations in elevation (417 feet).

The area within 2 miles of Edgartown is covered by water (54%), trees (25%), and artificial surfaces (16%), within 10 miles by water (80%) and trees (17%), and within 50 miles by water (81%) and trees (11%).