Climate and Average Weather Year Round in Oleiros PortugalIn Oleiros, the summers are short, warm, dry, and mostly clear and the winters are very cold, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 33°F to 84°F and is rarely below 23°F or above 95°F. Based on the tourism score, the best time of year to visit Oleiros for warm-weather activities is from mid June to mid September. Average Temperature in OleirosThe warm season lasts for 2.9 months, from June 20 to September 16, with an average daily high temperature above 77°F. The hottest month of the year in Oleiros is August, with an average high of 83°F and low of 56°F. The cool season lasts for 3.7 months, from November 15 to March 5, with an average daily high temperature below 57°F. The coldest month of the year in Oleiros is January, with an average low of 33°F and high of 51°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. Cave Junction, Oregon, United States (5,492 miles away) and Mount Beauty, Australia (11,086 miles) are the far-away foreign places with temperatures most similar to Oleiros (view comparison). CloudsIn Oleiros, 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 Oleiros begins around June 6 and lasts for 3.3 months, ending around September 16. The clearest month of the year in Oleiros is July, during which on average the sky is clear, mostly clear, or partly cloudy 87% of the time. The cloudier part of the year begins around September 16 and lasts for 8.7 months, ending around June 6. The cloudiest month of the year in Oleiros is December, during which on average the sky is overcast or mostly cloudy 57% 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 Oleiros varies significantly throughout the year. The wetter season lasts 8.1 months, from September 23 to May 27, with a greater than 19% chance of a given day being a wet day. The month with the most wet days in Oleiros is November, with an average of 9.5 days with at least 0.04 inches of precipitation. The drier season lasts 3.9 months, from May 27 to September 23. The month with the fewest wet days in Oleiros is July, with an average of 1.4 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 Oleiros is November, with an average of 9.5 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 34% on October 30.
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. Oleiros experiences significant seasonal variation in monthly rainfall. The rainy period of the year lasts for 10 months, from August 23 to June 27, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Oleiros is November, with an average rainfall of 4.0 inches. The rainless period of the year lasts for 1.9 months, from June 27 to August 23. The month with the least rain in Oleiros is July, with an average rainfall of 0.2 inches.
SunThe length of the day in Oleiros varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 20 minutes of daylight; the longest day is June 20, with 15 hours, 0 minutes of daylight.
The earliest sunrise is at 6:02 AM on June 14, and the latest sunrise is 1 hour, 52 minutes later at 7:54 AM on October 26. The earliest sunset is at 5:06 PM on December 6, and the latest sunset is 3 hours, 58 minutes later at 9:04 PM on June 27. Daylight saving time (DST) is observed in Oleiros during 2024, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 27. 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 Oleiros, 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, remaining a virtually constant 0% 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 Oleiros does not vary significantly over the course of the year, remaining within 0.4 miles per hour of 6.6 miles per hour throughout.
The predominant average hourly wind direction in Oleiros varies throughout the year. The wind is most often from the north for 2.1 weeks, from March 18 to April 2 and for 4.0 months, from June 2 to October 1, with a peak percentage of 46% on July 23. The wind is most often from the west for 2.0 months, from April 2 to June 2 and for 1.6 weeks, from October 1 to October 12, with a peak percentage of 39% on May 27. The wind is most often from the east for 5.2 months, from October 12 to March 18, with a peak percentage of 37% on January 1. Best Time of Year to VisitTo characterize how pleasant the weather is in Oleiros 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 Oleiros for general outdoor tourist activities is from mid June to mid September, with a peak score in the second week of July. Tourism Score in OleirosThe 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 Oleiros for hot-weather activities is from early July to late August, with a peak score in the last week of July. Beach/Pool Score in OleirosMethodologyFor 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 Oleiros typically lasts for 7.5 months (229 days), from around March 30 to around November 14, rarely starting before March 4 or after April 23, and rarely ending before October 24 or after December 8. 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 Oleiros should appear around March 23, only rarely appearing before March 9 or after April 9. 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 3.1 months, from May 17 to August 20, with an average daily incident shortwave energy per square meter above 6.9 kWh. The brightest month of the year in Oleiros is July, with an average of 8.0 kWh. The darker period of the year lasts for 3.6 months, from October 25 to February 14, with an average daily incident shortwave energy per square meter below 3.1 kWh. The darkest month of the year in Oleiros is December, with an average of 1.9 kWh.
TopographyFor the purposes of this report, the geographical coordinates of Oleiros are 39.919 deg latitude, -7.914 deg longitude, and 1,673 ft elevation. The topography within 2 miles of Oleiros contains very significant variations in elevation, with a maximum elevation change of 1,158 feet and an average elevation above sea level of 1,935 feet. Within 10 miles contains very significant variations in elevation (2,779 feet). Within 50 miles contains large variations in elevation (6,558 feet). The area within 2 miles of Oleiros is covered by trees (87%) and cropland (13%), within 10 miles by trees (93%), and within 50 miles by trees (57%) and cropland (32%). Data SourcesThis report illustrates the typical weather in Oleiros, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Oleiros. For each station, the records are corrected for the elevation difference between that station and Oleiros 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 Oleiros is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Oleiros 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 Oleiros 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. |