Fall Weather in Isle of Man Isle of Man

Daily high temperatures decrease by 13°F, from 62°F to 49°F, rarely falling below 43°F or exceeding 66°F.

Daily low temperatures decrease by 11°F, from 54°F to 42°F, rarely falling below 34°F or exceeding 58°F.

For reference, on July 30, the hottest day of the year, temperatures in Isle of Man typically range from 55°F to 64°F, while on February 18, the coldest day of the year, they range from 39°F to 46°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.

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The fall in Isle of Man experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 50% to 61%.

The clearest day of the fall is September 2, with clear, mostly clear, or partly cloudy conditions 50% of the time.

For reference, on January 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 66%, while on July 14, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 51%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Isle of Man, the chance of a wet day over the course of the fall is very rapidly increasing, starting the season at 32% and ending it at 40%.

For reference, the year's highest daily chance of a wet day is 47% on January 3, and its lowest chance is 26% on June 7.

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 Isle of Man is increasing, starting the season at 2.4 inches, when it rarely exceeds 4.0 inches or falls below 1.0 inches, and ending the season at 3.4 inches, when it rarely exceeds 5.5 inches or falls below 1.6 inches.

The highest average 31-day accumulation is 3.6 inches on October 26.

Over the course of the fall in Isle of Man, 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 5 hours, 56 minutes, implying an average daily decrease of 3 minutes, 57 seconds, and weekly decrease of 27 minutes, 42 seconds.

The shortest day of the fall is November 30, with 7 hours, 45 minutes of daylight and the longest day is September 1, with 13 hours, 42 minutes of daylight.

The earliest sunrise of the fall in Isle of Man is 6:26 AM on September 1 and the latest sunrise is 1 hour, 48 minutes later at 8:14 AM on November 30.

The latest sunset is 8:08 PM on September 1 and the earliest sunset is 4 hours, 9 minutes earlier at 3:59 PM on November 30.

Daylight saving time (DST) starts at 1:00 AM on October 27, 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 4:43 AM and sets 17 hours, 12 minutes later, at 9:55 PM, while on December 21, the shortest day of the year, it rises at 8:36 AM and sets 7 hours, 19 minutes later, at 3:55 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 Isle of Man is essentially constant during the fall, remaining around 0% throughout.

For reference, on July 16, the muggiest day of the year, there are muggy conditions 0% 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 Isle of Man is very rapidly increasing during the fall, increasing from 14.8 miles per hour to 20.3 miles per hour over the course of the season.

For reference, on January 2, the windiest day of the year, the daily average wind speed is 21.9 miles per hour, while on June 13, the calmest day of the year, the daily average wind speed is 12.3 miles per hour.

The hourly average wind direction in Isle of Man throughout the fall is predominantly from the west, with a peak proportion of 40% on November 10.

Isle of Man 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 Isle of Man is rapidly decreasing during the fall, falling by 7°F, from 59°F to 52°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 Isle of Man typically lasts for 8.9 months (272 days), from around March 11 to around December 8, rarely starting after April 21, or ending before October 29.

The fall in Isle of Man is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly decreasing from 100% to 59% 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 Isle of Man are increasing during the fall, increasing by 333°F, from 825°F to 1,157°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 Isle of Man is very rapidly decreasing during the fall, falling by 3.5 kWh, from 4.2 kWh to 0.6 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Isle of Man are 54.250 deg latitude, -4.500 deg longitude, and 0 ft elevation.

The topography within 2 miles of Isle of Man 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 Isle of Man is covered by grassland (64%) and trees (34%), within 10 miles by water (44%) and grassland (39%), and within 50 miles by water (86%).