May Weather at Dyess Air Force Base United StatesDaily high temperatures increase by 6°F, from 83°F to 89°F, rarely falling below 72°F or exceeding 98°F. Daily low temperatures increase by 8°F, from 59°F to 67°F, rarely falling below 48°F or exceeding 75°F. For reference, on July 24, the hottest day of the year, temperatures at Dyess Air Force Base typically range from 74°F to 96°F, while on January 4, the coldest day of the year, they range from 34°F to 57°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. 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. Hacıpaşa, Turkey (6,931 miles away) and Turaif, Saudi Arabia (7,254 miles) are the far-away foreign places with temperatures most similar to Dyess Air Force Base (view comparison). CloudsThe month of May at Dyess Air Force Base experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 30% throughout the month. The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 71% of the time. For reference, on February 24, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 43%, while on June 10, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 75%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Dyess Air Force Base, the chance of a wet day over the course of May is very rapidly increasing, starting the month at 25% and ending it at 34%. For reference, the year's highest daily chance of a wet day is 35% on May 26, and its lowest chance is 8% on January 11. 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 May at Dyess Air Force Base is increasing, starting the month at 2.4 inches, when it rarely exceeds 5.4 inches or falls below 0.8 inches, and ending the month at 3.4 inches, when it rarely exceeds 6.3 inches or falls below 1.1 inches. The highest average 31-day accumulation is 3.4 inches on May 30. SunOver the course of May at Dyess Air Force Base, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 39 minutes, implying an average daily increase of 1 minute, 19 seconds, and weekly increase of 9 minutes, 12 seconds. The shortest day of the month is May 1, with 13 hours, 29 minutes of daylight and the longest day is May 31, with 14 hours, 8 minutes of daylight. The latest sunrise of the month at Dyess Air Force Base is 6:52 AM on May 1 and the earliest sunrise is 19 minutes earlier at 6:33 AM on May 31. The earliest sunset is 8:21 PM on May 1 and the latest sunset is 20 minutes later at 8:41 PM on May 31. Daylight saving time is observed at Dyess Air Force Base during 2024, but it neither starts nor ends during May, so the entire month is in standard time. For reference, on June 20, the longest day of the year, the Sun rises at 6:32 AM and sets 14 hours, 17 minutes later, at 8:49 PM, while on December 21, the shortest day of the year, it rises at 7:37 AM and sets 10 hours, 1 minute later, at 5:38 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 May 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 at Dyess Air Force Base is very rapidly increasing during May, rising from 9% to 32% over the course of the month. For reference, on June 24, the muggiest day of the year, there are muggy conditions 50% of the time, while on December 29, 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 at Dyess Air Force Base is gradually decreasing during May, decreasing from 12.2 miles per hour to 11.6 miles per hour over the course of the month. For reference, on April 1, the windiest day of the year, the daily average wind speed is 12.8 miles per hour, while on August 22, the calmest day of the year, the daily average wind speed is 9.2 miles per hour. The hourly average wind direction at Dyess Air Force Base throughout May is predominantly from the south, with a peak proportion of 68% on May 31. 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). The growing season at Dyess Air Force Base typically lasts for 7.9 months (240 days), from around March 20 to around November 15, rarely starting before February 24 or after April 12, and rarely ending before October 27 or after December 3. The month of May at Dyess Air Force Base is reliably fully within the growing 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 at Dyess Air Force Base are rapidly increasing during May, increasing by 685°F, from 1,019°F to 1,704°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 at Dyess Air Force Base is essentially constant during May, remaining within 0.1 kWh of 7.0 kWh throughout. TopographyFor the purposes of this report, the geographical coordinates of Dyess Air Force Base are 32.420 deg latitude, -99.857 deg longitude, and 1,781 ft elevation. The topography within 2 miles of Dyess Air Force Base contains only modest variations in elevation, with a maximum elevation change of 135 feet and an average elevation above sea level of 1,791 feet. Within 10 miles contains only modest variations in elevation (801 feet). Within 50 miles contains significant variations in elevation (1,430 feet). The area within 2 miles of Dyess Air Force Base is covered by shrubs (50%), grassland (29%), and cropland (20%), within 10 miles by shrubs (40%) and cropland (31%), and within 50 miles by shrubs (39%) and grassland (37%). Data SourcesThis report illustrates the typical weather at Dyess Air Force Base, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointDyess Air Force Base has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required. In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations. The stations on which we may fall back include but are not limited to Abilene Regional Airport, Avenger Field, Coleman Municipal Airport, Stephens County Airport, Brownwood Municipal Airport, Winston Field, Mathis Field, and Comanche County-City Airport. Other DataAll data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus. All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid. Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations. Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory. Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database . Time zones for airports and weather stations are provided by AskGeo.com . Maps are © OpenStreetMap contributors. 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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