Climate and Average Weather Year Round in San Ramón BoliviaIn San Ramón, the wet season is oppressive and overcast, the dry season is muggy and partly cloudy, and it is hot year round. Over the course of the year, the temperature typically varies from 66°F to 94°F and is rarely below 57°F or above 101°F. Based on the beach/pool score, the best time of year to visit San Ramón for hot-weather activities is from mid May to mid September. Average Temperature in San RamónThe hot season lasts for 2.2 months, from August 9 to October 16, with an average daily high temperature above 92°F. The hottest month of the year in San Ramón is October, with an average high of 92°F and low of 73°F. The cool season lasts for 5.3 months, from January 5 to June 15, with an average daily high temperature below 87°F. The coldest month of the year in San Ramón is June, with an average low of 67°F and high of 87°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. Coimbatore, India (9,857 miles away); Chai Buri, Thailand (11,301 miles); and Pailin, Cambodia (11,596 miles) are the far-away foreign places with temperatures most similar to San Ramón (view comparison). CloudsIn San Ramón, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year. The clearer part of the year in San Ramón begins around May 14 and lasts for 4.5 months, ending around September 29. The clearest month of the year in San Ramón is August, during which on average the sky is clear, mostly clear, or partly cloudy 68% of the time. The cloudier part of the year begins around September 29 and lasts for 7.5 months, ending around May 14. The cloudiest month of the year in San Ramón is February, during which on average the sky is overcast or mostly cloudy 85% 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 San Ramón varies very significantly throughout the year. The wetter season lasts 6.2 months, from October 14 to April 21, with a greater than 40% chance of a given day being a wet day. The month with the most wet days in San Ramón is January, with an average of 21.9 days with at least 0.04 inches of precipitation. The drier season lasts 5.8 months, from April 21 to October 14. The month with the fewest wet days in San Ramón is July, with an average of 2.7 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 San Ramón is January, with an average of 21.9 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 73% on January 11.
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. San Ramón experiences extreme seasonal variation in monthly rainfall. Rain falls throughout the year in San Ramón. The month with the most rain in San Ramón is January, with an average rainfall of 9.7 inches. The month with the least rain in San Ramón is July, with an average rainfall of 0.7 inches.
SunThe length of the day in San Ramón varies over the course of the year. In 2024, the shortest day is June 20, with 11 hours, 21 minutes of daylight; the longest day is December 21, with 12 hours, 55 minutes of daylight.
The earliest sunrise is at 5:41 AM on November 20, and the latest sunrise is 1 hour, 1 minute later at 6:42 AM on July 10. The earliest sunset is at 5:58 PM on May 31, and the latest sunset is 55 minutes later at 6:53 PM on January 23. Daylight saving time (DST) is not observed in San Ramón 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. San Ramón experiences extreme seasonal variation in the perceived humidity. The muggier period of the year lasts for 10 months, from August 30 to July 7, during which time the comfort level is muggy, oppressive, or miserable at least 52% of the time. The month with the most muggy days in San Ramón is January, with 30.9 days that are muggy or worse. The month with the fewest muggy days in San Ramón is August, with 13.2 days that are muggy or worse.
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 San Ramón experiences mild seasonal variation over the course of the year. The windier part of the year lasts for 4.1 months, from June 23 to October 28, with average wind speeds of more than 5.9 miles per hour. The windiest month of the year in San Ramón is September, with an average hourly wind speed of 6.7 miles per hour. The calmer time of year lasts for 7.9 months, from October 28 to June 23. The calmest month of the year in San Ramón is March, with an average hourly wind speed of 5.1 miles per hour.
The predominant average hourly wind direction in San Ramón is from the north throughout the year. Best Time of Year to VisitTo characterize how pleasant the weather is in San Ramón 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 San Ramón for general outdoor tourist activities is from late May to late August, with a peak score in the third week of July. Tourism Score in San RamónThe 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 San Ramón for hot-weather activities is from mid May to mid September, with a peak score in the second week of August. Beach/Pool Score in San RamónMethodologyFor 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). Temperatures in San Ramón 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. 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 per square meter does not vary significantly over the course of the year, remaining within 0.3 kilowatt-hours of 5.2 kilowatt-hours throughout.
TopographyFor the purposes of this report, the geographical coordinates of San Ramón are -13.283 deg latitude, -64.717 deg longitude, and 446 ft elevation. The topography within 2 miles of San Ramón is essentially flat, with a maximum elevation change of 79 feet and an average elevation above sea level of 458 feet. Within 10 miles is essentially flat (98 feet). Within 50 miles also contains only modest variations in elevation (299 feet). The area within 2 miles of San Ramón is covered by trees (72%) and water (13%), within 10 miles by trees (39%) and shrubs (33%), and within 50 miles by shrubs (29%) and trees (27%). Data SourcesThis report illustrates the typical weather in San Ramón, 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 is only a single weather station, Teniente Jorge Henrich Arauz Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of San Ramón. At a distance of 172 kilometers from San Ramón, further than our threshold of 150 kilometers, this station is deemed insufficiently nearby to be relied upon as our primary source for temperature and dew point records. Consequently, the station records are blended with interpolated values from NASA's MERRA-2 satellite-era reanalysis , and both are corrected for elevation differences according to the International Standard Atmosphere . The weight assigned to the MERRA-2 value depends on the distance from San Ramón to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. In this case, the MERRA-2 weight is 31%, making the weight assigned to the weather station 69%. 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. |