December Weather in Acatlán MexicoDaily high temperatures are around 69°F, rarely falling below 60°F or exceeding 75°F. Daily low temperatures are around 44°F, rarely falling below 36°F or exceeding 50°F. For reference, on May 9, the hottest day of the year, temperatures in Acatlán typically range from 53°F to 78°F, while on January 12, the coldest day of the year, they range from 42°F to 68°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. 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. Average Hourly Temperature in December in Acatlán
frigid
15°F
freezing
32°F
very cold
45°F
cold
55°F
cool
65°F
comfortable
75°F
warm
85°F
hot
95°F
sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
Punata, Bolivia (3,420 miles away); Matamba, Tanzania (9,184 miles); and Desē, Ethiopia (8,870 miles) are the far-away foreign places with temperatures most similar to Acatlán (view comparison). CloudsThe month of December in Acatlán experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 46% throughout the month. The clearest day of the month is December 25, with clear, mostly clear, or partly cloudy conditions 55% of the time. For reference, on September 14, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 84%, while on March 10, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Acatlán, the chance of a wet day over the course of December is decreasing, starting the month at 14% and ending it at 10%. For reference, the year's highest daily chance of a wet day is 78% on July 3, and its lowest chance is 9% on January 14. 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 December in Acatlán is gradually decreasing, starting the month at 0.9 inches, when it rarely exceeds 2.0 inches or falls below 0.2 inches, and ending the month at 0.5 inches, when it rarely exceeds 1.3 inches or falls below 0.1 inches. Average Monthly Rainfall in December in Acatlán
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.
SunOver the course of December in Acatlán, the length of the day is essentially constant. The shortest day of the month is December 20, with 10 hours, 55 minutes of daylight and the longest day is December 1, with 11 hours, 0 minutes of daylight. Hours of Daylight and Twilight in December in Acatlán
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
The earliest sunrise of the month in Acatlán is 6:53 AM on December 1 and the latest sunrise is 16 minutes later at 7:08 AM on December 31. The earliest sunset is 5:52 PM on December 1 and the latest sunset is 12 minutes later at 6:05 PM on December 31. Daylight saving time is not observed in Acatlán during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 5:54 AM and sets 13 hours, 21 minutes later, at 7:16 PM, while on December 21, the shortest day of the year, it rises at 7:04 AM and sets 10 hours, 55 minutes later, at 5:59 PM. Sunrise & Sunset with Twilight in December in Acatlán
The solar day over the course of December. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.
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. Solar Elevation and Azimuth in December in Acatlán
northeastsouthwest
Solar elevation and azimuth over the course of December 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).
MoonThe figure below presents a compact representation of key lunar data for December 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 Acatlán is essentially constant during December, remaining around 0% throughout. For reference, on May 18, 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. 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 Acatlán is essentially constant during December, remaining around 4.6 miles per hour throughout. For reference, on June 27, the windiest day of the year, the daily average wind speed is 6.4 miles per hour, while on December 21, the calmest day of the year, the daily average wind speed is 4.5 miles per hour. The lowest daily average wind speed during December is 4.5 miles per hour on December 21. The wind direction in Acatlán during December is predominantly out of the east from December 1 to December 8 and the south from December 8 to December 31. Wind Direction in December in Acatlán
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).
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). While it does not do so every year, freezing temperatures are seen in Acatlán over some winters. The day least likely to be in the growing season is January 6, with a 65% chance. Time Spent in Various Temperature Bands and the Growing Season in December in Acatlán
frigid
15°F
freezing
32°F
very cold
45°F
cold
55°F
cool
65°F
comfortable
75°F
warm
85°F
hot
95°F
sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is 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 in Acatlán are increasing during December, increasing by 189°F, from 3,494°F to 3,683°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 Acatlán is essentially constant during December, remaining within 0.1 kWh of 4.7 kWh throughout. The lowest average daily incident shortwave solar energy during December is 4.7 kWh on December 29. TopographyFor the purposes of this report, the geographical coordinates of Acatlán are 20.146 deg latitude, -98.440 deg longitude, and 7,047 ft elevation. The topography within 2 miles of Acatlán contains significant variations in elevation, with a maximum elevation change of 702 feet and an average elevation above sea level of 7,125 feet. Within 10 miles contains significant variations in elevation (5,164 feet). Within 50 miles also contains extreme variations in elevation (11,621 feet). The area within 2 miles of Acatlán is covered by cropland (48%), shrubs (34%), and grassland (18%), within 10 miles by cropland (44%) and shrubs (24%), and within 50 miles by cropland (39%) and trees (25%). Data SourcesThis report illustrates the typical weather in Acatlán, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointThere are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Acatlán. For each station, the records are corrected for the elevation difference between that station and Acatlán according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. The estimated value at Acatlán is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Acatlán and a given station. The stations contributing to this reconstruction are:
![]() To get a sense of how much these sources agree with each other, you can view a comparison of Acatlán and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data. 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. We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader. Please review our full terms contained on our Terms of Service page. |