Fall Weather in Fort William United Kingdom

Daily high temperatures decrease by 16°F, from 60°F to 45°F, rarely falling below 38°F or exceeding 66°F.

Daily low temperatures decrease by 13°F, from 50°F to 37°F, rarely falling below 28°F or exceeding 55°F.

For reference, on July 30, the hottest day of the year, temperatures in Fort William typically range from 52°F to 63°F, while on January 1, the coldest day of the year, they range from 34°F to 42°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.

Metlakatla, United States (4,147 miles away) is the far-away foreign place with temperatures most similar to Fort William (view comparison).

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The fall in Fort William experiences rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 63% to 78%. The highest chance of overcast or mostly cloudy conditions is 78% on November 7.

The clearest day of the fall is September 2, with clear, mostly clear, or partly cloudy conditions 37% of the time.

For reference, on January 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on May 22, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 40%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Fort William, the chance of a wet day over the course of the fall is increasing, starting the season at 49% and ending it at 54%.

For reference, the year's highest daily chance of a wet day is 62% on January 3, and its lowest chance is 39% on April 28.

Over the course of the fall in Fort William, the chance of a day with only rain increases from 49% to 53%, 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 Fort William is rapidly increasing, starting the season at 4.5 inches, when it rarely exceeds 8.0 inches or falls below 1.9 inches, and ending the season at 5.7 inches, when it rarely exceeds 9.8 inches or falls below 2.3 inches.

Over the course of the fall in Fort William, 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 6 hours, 36 minutes, implying an average daily decrease of 4 minutes, 24 seconds, and weekly decrease of 30 minutes, 49 seconds.

The shortest day of the fall is November 30, with 7 hours, 15 minutes of daylight and the longest day is September 1, with 13 hours, 52 minutes of daylight.

The earliest sunrise of the fall in Fort William is 6:23 AM on September 1 and the latest sunrise is 2 hours, 8 minutes later at 8:31 AM on November 30.

The latest sunset is 8:15 PM on September 1 and the earliest sunset is 4 hours, 29 minutes earlier at 3:46 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 4:26 AM and sets 17 hours, 50 minutes later, at 10:17 PM, while on December 21, the shortest day of the year, it rises at 8:56 AM and sets 6 hours, 45 minutes later, at 3:41 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 Fort William is essentially constant during the fall, remaining around 0% throughout.

For reference, on June 20, 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 Fort William is rapidly increasing during the fall, increasing from 10.9 miles per hour to 13.0 miles per hour over the course of the season.

For reference, on January 24, the windiest day of the year, the daily average wind speed is 15.0 miles per hour, while on July 23, the calmest day of the year, the daily average wind speed is 9.7 miles per hour.

The wind direction in Fort William during the fall is predominantly out of the west from September 1 to September 15 and from November 4 to November 26 and the south from September 15 to November 4 and from November 26 to November 30.

Fort William 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 Fort William is decreasing during the fall, falling by 6°F, from 56°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 Fort William typically lasts for 6.7 months (204 days), from around April 11 to around November 1, rarely starting before March 15 or after May 9, and rarely ending before October 9 or after November 29.

During the fall in Fort William, the chance that a given day is within the growing season is very rapidly decreasing falling from 100% to 9% 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 Fort William are gradually increasing during the fall, increasing by 168°F, from 702°F to 870°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 Fort William is very rapidly decreasing during the fall, falling by 3.0 kWh, from 3.4 kWh to 0.3 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Fort William are 56.816 deg latitude, -5.112 deg longitude, and 79 ft elevation.

The topography within 2 miles of Fort William contains very significant variations in elevation, with a maximum elevation change of 1,512 feet and an average elevation above sea level of 297 feet. Within 10 miles contains very significant variations in elevation (4,390 feet). Within 50 miles also contains extreme variations in elevation (4,396 feet).

The area within 2 miles of Fort William is covered by water (23%), grassland (20%), trees (19%), and shrubs (18%), within 10 miles by shrubs (29%) and grassland (27%), and within 50 miles by grassland (27%) and shrubs (20%).