Climate and Average Weather Year Round in Unión ArgentinaIn Unión, the summers are hot, wet, and mostly clear and the winters are cold, dry, and partly cloudy. Over the course of the year, the temperature typically varies from 37°F to 90°F and is rarely below 28°F or above 99°F. Based on the tourism score, the best time of year to visit Unión for warm-weather activities is from mid October to mid April. Average Temperature in UniónThe hot season lasts for 3.8 months, from November 18 to March 12, with an average daily high temperature above 84°F. The hottest month of the year in Unión is January, with an average high of 90°F and low of 64°F. The cool season lasts for 3.0 months, from May 21 to August 19, with an average daily high temperature below 65°F. The coldest month of the year in Unión is July, with an average low of 37°F and high of 59°F.
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. Quorn, Australia (7,529 miles away) and Eulomogo, Australia (7,274 miles) are the far-away foreign places with temperatures most similar to Unión (view comparison). CloudsIn Unión, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year. The clearer part of the year in Unión begins around October 13 and lasts for 6.3 months, ending around April 22. The clearest month of the year in Unión is February, during which on average the sky is clear, mostly clear, or partly cloudy 80% of the time. The cloudier part of the year begins around April 22 and lasts for 5.7 months, ending around October 13. The cloudiest month of the year in Unión is June, during which on average the sky is overcast or mostly cloudy 47% of the time.
PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Unión varies significantly throughout the year. The wetter season lasts 6.1 months, from October 2 to April 6, with a greater than 23% chance of a given day being a wet day. The month with the most wet days in Unión is January, with an average of 12.1 days with at least 0.04 inches of precipitation. The drier season lasts 5.9 months, from April 6 to October 2. The month with the fewest wet days in Unión is June, with an average of 2.2 days with at least 0.04 inches of precipitation. Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Unión is January, with an average of 12.1 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 40% on January 8.
RainfallTo show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Unión experiences significant seasonal variation in monthly rainfall. Rain falls throughout the year in Unión. The month with the most rain in Unión is January, with an average rainfall of 3.6 inches. The month with the least rain in Unión is June, with an average rainfall of 0.4 inches.
SunThe length of the day in Unión varies significantly over the course of the year. In 2024, the shortest day is June 20, with 9 hours, 47 minutes of daylight; the longest day is December 21, with 14 hours, 32 minutes of daylight.
The earliest sunrise is at 6:02 AM on December 5, and the latest sunrise is 2 hours, 31 minutes later at 8:32 AM on June 28. The earliest sunset is at 6:18 PM on June 12, and the latest sunset is 2 hours, 24 minutes later at 8:41 PM on January 7. Daylight saving time (DST) is not observed in Unión during 2024. 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 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. 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 perceived humidity level in Unión, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 4% of 4% throughout.
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 Unión experiences mild seasonal variation over the course of the year. The windier part of the year lasts for 6.5 months, from August 7 to February 22, with average wind speeds of more than 8.9 miles per hour. The windiest month of the year in Unión is October, with an average hourly wind speed of 10.1 miles per hour. The calmer time of year lasts for 5.5 months, from February 22 to August 7. The calmest month of the year in Unión is June, with an average hourly wind speed of 7.8 miles per hour.
The predominant average hourly wind direction in Unión varies throughout the year. The wind is most often from the east for 3.1 months, from January 1 to April 4, with a peak percentage of 37% on February 21. The wind is most often from the south for 1.1 months, from April 4 to May 6 and for 5.3 months, from July 21 to December 31, with a peak percentage of 40% on December 5. The wind is most often from the north for 2.5 months, from May 6 to July 21, with a peak percentage of 34% on July 3. Best Time of Year to VisitTo characterize how pleasant the weather is in Unión throughout the year, we compute two travel scores. The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Unión for general outdoor tourist activities is from mid October to mid April, with a peak score in the second week of March. Tourism Score in UniónThe beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Unión for hot-weather activities is from early December to early March, with a peak score in the second week of January. Beach/Pool Score in UniónMethodologyFor each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed. Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies. Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more. Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter. Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter. 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 in Unión typically lasts for 9.2 months (280 days), from around August 27 to around June 2, rarely starting before August 5 or after September 17, and rarely ending before April 29 or after June 28. 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. Based on growing degree days alone, the first spring blooms in Unión should appear around August 6, only rarely appearing before July 29 or after August 16. 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 experiences extreme seasonal variation over the course of the year. The brighter period of the year lasts for 3.5 months, from November 1 to February 14, with an average daily incident shortwave energy per square meter above 7.2 kWh. The brightest month of the year in Unión is December, with an average of 8.3 kWh. The darker period of the year lasts for 3.5 months, from April 28 to August 13, with an average daily incident shortwave energy per square meter below 3.7 kWh. The darkest month of the year in Unión is June, with an average of 2.6 kWh.
TopographyFor the purposes of this report, the geographical coordinates of Unión are -35.153 deg latitude, -65.946 deg longitude, and 1,240 ft elevation. The topography within 2 miles of Unión contains only modest variations in elevation, with a maximum elevation change of 171 feet and an average elevation above sea level of 1,245 feet. Within 10 miles also contains only modest variations in elevation (233 feet). Within 50 miles contains only modest variations in elevation (1,394 feet). The area within 2 miles of Unión is covered by shrubs (77%) and trees (11%), within 10 miles by shrubs (49%) and trees (24%), and within 50 miles by shrubs (68%) and trees (15%). Data SourcesThis report illustrates the typical weather in Unión, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Unión is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . 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. The temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Unión, according to the International Standard Atmosphere . All 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. 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. |