Average Weather at Portorož Airport Slovenia

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At Portorož Airport, the summers are warm, the winters are long and chilly, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 33°F to 84°F and is rarely below 24°F or above 91°F.

The warm season lasts for 3.0 months, from June 9 to September 9, with an average daily high temperature above 77°F. The hottest day of the year is August 3, with an average high of 84°F and low of 63°F.

The cool season lasts for 3.7 months, from November 22 to March 13, with an average daily high temperature below 54°F. The coldest day of the year is February 8, with an average low of 33°F and high of 47°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.

At Portorož 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 Portorož Airport begins around June 14 and lasts for 3.3 months, ending around September 23. On August 1, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 76% of the time, and overcast or mostly cloudy 24% of the time.

The cloudier part of the year begins around September 23 and lasts for 8.7 months, ending around June 14. On December 6, the cloudiest day of the year, the sky is overcast or mostly cloudy 56% of the time, and clear, mostly clear, or partly cloudy 44% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Portorož Airport varies throughout the year.

The wetter season lasts 8.8 months, from March 28 to December 21, with a greater than 25% chance of a given day being a wet day. The chance of a wet day peaks at 31% on June 5.

The drier season lasts 3.2 months, from December 21 to March 28. The smallest chance of a wet day is 18% on March 5.

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 31% on June 5.

Rainfall

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. Portorož Airport experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year at Portorož Airport. The most rain falls during the 31 days centered around November 6, with an average total accumulation of 3.7 inches.

The least rain falls around July 24, with an average total accumulation of 1.8 inches.

The length of the day at Portorož Airport varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 42 minutes of daylight; the longest day is June 21, with 15 hours, 41 minutes of daylight.

The earliest sunrise is at 5:16 AM on June 15, and the latest sunrise is 2 hours, 29 minutes later at 7:45 AM on January 2. The earliest sunset is at 4:22 PM on December 10, and the latest sunset is 4 hours, 36 minutes later at 8:58 PM on June 26.

Daylight saving time (DST) is observed at Portorož Airport during 2017, starting in the spring on March 26, lasting 7.1 months, and ending in the fall on October 29.

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.

Portorož Airport experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.4 months, from June 11 to September 23, during which time the comfort level is muggy, oppressive, or miserable at least 6% of the time. The muggiest day of the year is August 6, with muggy conditions 24% of the time.

The least muggy day of the year is February 23, when muggy conditions are essentially unheard of.

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 Portorož Airport experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.5 months, from September 27 to April 13, with average wind speeds of more than 3.9 miles per hour. The windiest day of the year is February 5, with an average hourly wind speed of 4.8 miles per hour.

The calmer time of year lasts for 5.5 months, from April 13 to September 27. The calmest day of the year is July 20, with an average hourly wind speed of 3.1 miles per hour.

The predominant average hourly wind direction at Portorož Airport is from the east throughout the year.

Portorož 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 significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.1 months, from June 17 to September 19, with an average temperature above 71°F. The day of the year with the warmest water is August 4, with an average temperature of 77°F.

The time of year with cooler water lasts for 3.8 months, from December 20 to April 15, with an average temperature below 55°F. The day of the year with the coolest water is February 19, with an average temperature of 49°F.

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 6 to August 18, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is July 8, with an average of 7.1 kWh.

The darker period of the year lasts for 3.5 months, from October 29 to February 13, with an average daily incident shortwave energy per square meter below 2.5 kWh. The darkest day of the year is December 28, with an average of 1.3 kWh.

For the purposes of this report, the geographical coordinates of Portorož Airport are 45.475 deg latitude, 13.615 deg longitude, and 217 ft elevation.

The topography within 2 miles of Portorož Airport contains very significant variations in elevation, with a maximum elevation change of 909 feet and an average elevation above sea level of 164 feet. Within 10 miles also contains very significant variations in elevation (1,578 feet). Within 50 miles contains very significant variations in elevation (5,866 feet).

The area within 2 miles of Portorož Airport is covered by cropland (38%), trees (28%), and water (22%), within 10 miles by water (42%) and trees (27%), and within 50 miles by water (41%) and trees (32%).

This report illustrates the typical weather at Portorož 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

Portorož 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.

The stations on which we may fall back include but are not limited to Trieste, Trieste – Friuli Venezia Giulia Airport, Pula Airport, Udine / Rivolto, Rijeka, Rijeka/Krk Airport, Tarvisio, and Ljubljana Jože Pučnik Airport.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.