Climate and Average Weather Year Round at Horta Airport Portugal
At Horta Airport, the summers are short, warm, and muggy; the winters are long, cool, wet, and extremely windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 55°F to 77°F and is rarely below 50°F or above 80°F.
Based on the beach/pool score, the best time of year to visit Horta Airport for hot-weather activities is from mid July to early September.
Climate at Horta Airport
Average Temperature at Horta Airport
The warm season lasts for 2.5 months, from July 10 to September 25, with an average daily high temperature above 74°F. The hottest day of the year is August 15, with an average high of 77°F and low of 69°F.
The cool season lasts for 5.2 months, from November 30 to May 4, with an average daily high temperature below 65°F. The coldest day of the year is February 18, with an average low of 55°F and high of 62°F.
Average High and Low Temperature at Horta Airport
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.
Average Hourly Temperature at Horta Airport
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
At Horta Airport, 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 at Horta Airport begins around June 16 and lasts for 2.9 months, ending around September 13. On July 26, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 75% of the time, and overcast or mostly cloudy 25% of the time.
The cloudier part of the year begins around September 13 and lasts for 9.1 months, ending around June 16. On January 8, the cloudiest day of the year, the sky is overcast or mostly cloudy 64% of the time, and clear, mostly clear, or partly cloudy 36% of the time.
Cloud Cover Categories at Horta Airport
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Horta Airport varies significantly throughout the year.
The wetter season lasts 7.1 months, from September 15 to April 18, with a greater than 25% chance of a given day being a wet day. The chance of a wet day peaks at 40% on December 22.
The drier season lasts 4.9 months, from April 18 to September 15. The smallest chance of a wet day is 10% on July 12.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 40% on December 22.
Daily Chance of Precipitation at Horta Airport
To 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. Horta Airport experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year at Horta Airport. The most rain falls during the 31 days centered around December 12, with an average total accumulation of 3.9 inches.
The least rain falls around July 16, with an average total accumulation of 0.8 inches.
Average Monthly Rainfall at Horta Airport
The length of the day at Horta Airport varies significantly over the course of the year. In 2021, the shortest day is December 21, with 9 hours, 29 minutes of daylight; the longest day is June 21, with 14 hours, 52 minutes of daylight.
Hours of Daylight and Twilight at Horta Airport
The earliest sunrise is at 6:30 AM on June 13, and the latest sunrise is 1 hour, 49 minutes later at 8:19 AM on October 30. The earliest sunset is at 5:33 PM on December 6, and the latest sunset is 3 hours, 50 minutes later at 9:23 PM on June 27.
Daylight saving time (DST) is observed at Horta Airport during 2021, starting in the spring on March 28, lasting 7.1 months, and ending in the fall on October 31.
Sunrise & Sunset with Twilight and Daylight Saving Time at Horta Airport
The figure below presents a compact representation of key lunar data for 2021. 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.
Moon Rise, Set & Phases at Horta Airport
We 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.
Horta Airport experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.8 months, from June 10 to November 4, during which time the comfort level is muggy, oppressive, or miserable at least 15% of the time. The muggiest day of the year is August 13, with muggy conditions 60% of the time.
The least muggy day of the year is March 25, when muggy conditions are essentially unheard of.
Humidity Comfort Levels at Horta Airport
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
This 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 Horta Airport experiences extreme seasonal variation over the course of the year.
The windier part of the year lasts for 7.0 months, from October 4 to May 4, with average wind speeds of more than 14.1 miles per hour. The windiest day of the year is December 25, with an average hourly wind speed of 18.5 miles per hour.
The calmer time of year lasts for 5.0 months, from May 4 to October 4. The calmest day of the year is July 17, with an average hourly wind speed of 9.6 miles per hour.
Average Wind Speed at Horta Airport
The predominant average hourly wind direction at Horta Airport varies throughout the year.
The wind is most often from the south for 2.4 months, from January 18 to March 29 and for 1.3 months, from November 13 to December 21, with a peak percentage of 35% on January 29. The wind is most often from the west for 2.9 months, from March 29 to June 25; for 4.2 months, from July 8 to November 13; and for 4.0 weeks, from December 21 to January 18, with a peak percentage of 38% on August 3. The wind is most often from the north for 1.9 weeks, from June 25 to July 8, with a peak percentage of 32% on July 7.
Wind Direction at Horta Airport
Horta Airport is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 2.6 months, from July 16 to October 3, with an average temperature above 71°F. The day of the year with the warmest water is August 22, with an average temperature of 74°F.
The time of year with cooler water lasts for 4.9 months, from December 19 to May 17, with an average temperature below 63°F. The day of the year with the coolest water is March 2, with an average temperature of 60°F.
Average Water Temperature at Horta Airport
Best Time of Year to Visit
To characterize how pleasant the weather is at Horta Airport 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 Horta Airport for general outdoor tourist activities is from late June to early September, with a peak score in the third week of July.
Tourism Score at Horta Airport
The 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 Horta Airport for hot-weather activities is from mid July to early September, with a peak score in the first week of August.
Beach/Pool Score at Horta Airport
For 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.
Definitions 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 at Horta Airport 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.
Time Spent in Various Temperature Bands and the Growing Season at Horta Airport
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
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.
Growing Degree Days at Horta Airport
This 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 3.4 months, from May 8 to August 22, with an average daily incident shortwave energy per square meter above 6.4 kWh. The brightest day of the year is July 11, with an average of 7.5 kWh.
The darker period of the year lasts for 3.5 months, from October 29 to February 14, with an average daily incident shortwave energy per square meter below 3.0 kWh. The darkest day of the year is December 16, with an average of 1.8 kWh.
Average Daily Incident Shortwave Solar Energy at Horta Airport
For the purposes of this report, the geographical coordinates of Horta Airport are 38.520 deg latitude, -28.716 deg longitude, and 95 ft elevation.
The topography within 2 miles of Horta Airport contains very significant variations in elevation, with a maximum elevation change of 1,532 feet and an average elevation above sea level of 299 feet. Within 10 miles contains very significant variations in elevation (3,438 feet). Within 50 miles also contains extreme variations in elevation (7,585 feet).
The area within 2 miles of Horta Airport is covered by water (52%) and trees (35%), within 10 miles by water (86%) and trees (12%), and within 50 miles by water (97%).
This report illustrates the typical weather at Horta Airport, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
Horta Airport 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.
In this case, the only station close and reliable enough to use as a fallback is Lajes Field.
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.
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 © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The 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.