Fall Weather in Gibraltar Gibraltar

Daily high temperatures decrease by 17°F, from 80°F to 63°F, rarely falling below 59°F or exceeding 86°F.

Daily low temperatures decrease by 14°F, from 69°F to 55°F, rarely falling below 49°F or exceeding 73°F.

For reference, on August 4, the hottest day of the year, temperatures in Gibraltar typically range from 70°F to 82°F, while on January 21, the coldest day of the year, they range from 52°F to 61°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 Gibraltar experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 22% to 40%. The highest chance of overcast or mostly cloudy conditions is 46% on October 30.

The clearest day of the fall is September 1, with clear, mostly clear, or partly cloudy conditions 78% of the time.

For reference, on October 29, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 46%, while on July 17, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 94%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Gibraltar, the chance of a wet day over the course of the fall is very rapidly increasing, starting the season at 3% and ending it at 24%.

For reference, the year's highest daily chance of a wet day is 26% on November 20, and its lowest chance is 0% on July 27.

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 Gibraltar is very rapidly increasing, starting the season at 0.3 inches, when it rarely exceeds 0.8 inches, and ending the season at 3.2 inches, when it rarely exceeds 7.9 inches or falls below 0.3 inches.

The highest average 31-day accumulation is 3.2 inches on November 27.

Over the course of the fall in Gibraltar, 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, 1 minute, implying an average daily decrease of 2 minutes, 1 second, and weekly decrease of 14 minutes, 7 seconds.

The shortest day of the fall is November 30, with 9 hours, 54 minutes of daylight and the longest day is September 1, with 12 hours, 55 minutes of daylight.

The latest sunrise of the fall in Gibraltar is 8:38 AM on October 26 and the earliest sunrise is 59 minutes earlier at 7:39 AM on October 27.

The latest sunset is 8:48 PM on September 1 and the earliest sunset is 2 hours, 42 minutes earlier at 6:07 PM on November 30.

Daylight saving time (DST) starts at 2:00 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 7:04 AM and sets 14 hours, 37 minutes later, at 9:41 PM, while on December 21, the shortest day of the year, it rises at 8:28 AM and sets 9 hours, 42 minutes later, at 6:10 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 Gibraltar is very rapidly decreasing during the fall, falling from 55% to 0% over the course of the season.

For reference, on August 24, the muggiest day of the year, there are muggy conditions 56% 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 Gibraltar is increasing during the fall, increasing from 9.4 miles per hour to 11.0 miles per hour over the course of the season.

For reference, on February 24, the windiest day of the year, the daily average wind speed is 11.9 miles per hour, while on August 12, the calmest day of the year, the daily average wind speed is 9.0 miles per hour.

The hourly average wind direction in Gibraltar throughout the fall is predominantly from the east, with a peak proportion of 51% on September 5.

Gibraltar 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 Gibraltar is rapidly decreasing during the fall, falling by 9°F, from 72°F to 63°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).

Temperatures in Gibraltar are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

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 Gibraltar are very rapidly increasing during the fall, increasing by 1,526°F, from 3,701°F to 5,227°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 Gibraltar is very rapidly decreasing during the fall, falling by 3.8 kWh, from 6.4 kWh to 2.7 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Gibraltar are 36.133 deg latitude, -5.350 deg longitude, and 0 ft elevation.

The topography within 2 miles of Gibraltar 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 Gibraltar is covered by water (73%) and artificial surfaces (14%), within 10 miles by water (67%) and shrubs (12%), and within 50 miles by water (52%) and trees (17%).