July Weather in Gibraltar GibraltarDaily high temperatures increase by 3°F, from 79°F to 82°F, rarely falling below 74°F or exceeding 89°F. Daily low temperatures increase by 3°F, from 68°F to 70°F, rarely falling below 64°F or exceeding 74°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 temperatures for the quarter of the year centered on July. 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. CloudsThe month of July in Gibraltar experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 8% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 6% on July 17. The clearest day of the month is July 17, with clear, mostly clear, or partly cloudy conditions 94% 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%. PrecipitationA 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 July is essentially constant, remaining around 1% throughout. 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. RainfallTo show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day rainfall during July in Gibraltar is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.3 inches. The lowest average 31-day accumulation is 0.0 inches on July 27. SunOver the course of July in Gibraltar, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 35 minutes, implying an average daily decrease of 1 minute, 11 seconds, and weekly decrease of 8 minutes, 14 seconds. The shortest day of the month is July 31, with 13 hours, 59 minutes of daylight and the longest day is July 1, with 14 hours, 34 minutes of daylight. The earliest sunrise of the month in Gibraltar is 7:08 AM on July 1 and the latest sunrise is 20 minutes later at 7:27 AM on July 31. The latest sunset is 9:42 PM on July 1 and the earliest sunset is 15 minutes earlier at 9:27 PM on July 31. Daylight saving time is observed in Gibraltar during 2024, but it neither starts nor ends during July, so the entire month is in standard time. 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. MoonThe figure below presents a compact representation of key lunar data for July 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.
HumidityWe 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 increasing during July, rising from 29% to 53% over the course of the month. 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. WindThis 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 essentially constant during July, remaining within 0.2 miles per hour of 9.5 miles per hour throughout. 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 July is predominantly from the east, with a peak proportion of 52% on July 21. Water TemperatureGibraltar 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 gradually increasing during July, rising by 3°F, from 69°F to 72°F, over the course of the month. Growing SeasonDefinitions 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 rapidly increasing during July, increasing by 731°F, from 2,167°F to 2,898°F, over the course of the month. Solar EnergyThis 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 gradually decreasing during July, falling by 0.5 kWh, from 8.2 kWh to 7.7 kWh, over the course of the month. The highest average daily incident shortwave solar energy during July is 8.2 kWh on July 2. TopographyFor 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%). Data SourcesThis report illustrates the typical weather in Gibraltar, 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 Gibraltar International Airport page. DisclaimerThe 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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