Summer Weather in Bolzano ItalyDaily high temperatures are around 79°F, rarely falling below 65°F or exceeding 91°F. The highest daily average high temperature is 83°F on July 25. Daily low temperatures are around 57°F, rarely falling below 47°F or exceeding 66°F. The highest daily average low temperature is 61°F on July 28. For reference, on July 25, the hottest day of the year, temperatures in Bolzano typically range from 61°F to 83°F, while on January 5, the coldest day of the year, they range from 23°F to 40°F. The figure below shows you a compact characterization of the hourly average summer temperatures. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. Ronceverte, West Virginia, United States (4,477 miles away) is the far-away foreign place with temperatures most similar to Bolzano (view comparison). CloudsThe summer in Bolzano experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 55% to 42%. The lowest chance of overcast or mostly cloudy conditions is 36% on July 29. The clearest day of the summer is July 29, with clear, mostly clear, or partly cloudy conditions 64% of the time. For reference, on May 7, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 59%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 64%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Bolzano, the chance of a wet day over the course of the summer is very rapidly decreasing, starting the season at 41% and ending it at 32%. For reference, the year's highest daily chance of a wet day is 43% on June 12, and its lowest chance is 10% on January 22. RainfallTo show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day rainfall during the summer in Bolzano is essentially constant, remaining about 3.3 inches throughout, and rarely exceeding 5.3 inches or falling below 1.4 inches. The highest average 31-day accumulation is 3.6 inches on June 28. SunOver the course of the summer in Bolzano, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 2 hours, 14 minutes, implying an average daily decrease of 1 minute, 28 seconds, and weekly decrease of 10 minutes, 18 seconds. The shortest day of the summer is August 31, with 13 hours, 21 minutes of daylight and the longest day is June 20, with 15 hours, 49 minutes of daylight. The earliest sunrise of the summer in Bolzano is 5:21 AM on June 15 and the latest sunrise is 1 hour, 13 minutes later at 6:33 AM on August 31. The latest sunset is 9:11 PM on June 26 and the earliest sunset is 1 hour, 17 minutes earlier at 7:54 PM on August 31. Daylight saving time is observed in Bolzano during 2024, but it neither starts nor ends during the summer, so the entire season is in standard time. For reference, on June 20, the longest day of the year, the Sun rises at 5:21 AM and sets 15 hours, 49 minutes later, at 9:11 PM, while on December 21, the shortest day of the year, it rises at 7:55 AM and sets 8 hours, 35 minutes later, at 4:30 PM. 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 the summer of 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon. 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 chance that a given day will be muggy in Bolzano is gradually increasing during the summer, rising from 0% to 3% over the course of the season. The highest chance of a muggy day during the summer is 9% on July 27. For reference, on July 27, the muggiest day of the year, there are muggy conditions 9% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time. 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 Bolzano is essentially constant during the summer, remaining within 0.2 miles per hour of 3.0 miles per hour throughout. For reference, on January 31, the windiest day of the year, the daily average wind speed is 3.8 miles per hour, while on August 8, the calmest day of the year, the daily average wind speed is 2.8 miles per hour. The lowest daily average wind speed during the summer is 2.8 miles per hour on August 9. The hourly average wind direction in Bolzano throughout the summer is predominantly from the south, with a peak proportion of 49% on June 1. 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 Bolzano typically lasts for 7.1 months (217 days), from around March 27 to around October 30, rarely starting before March 7 or after April 18, and rarely ending before October 13 or after November 18. The summer in Bolzano is reliably fully within the growing season. 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. The average accumulated growing degree days in Bolzano are very rapidly increasing during the summer, increasing by 1,753°F, from 607°F to 2,360°F, over the course of the season. 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 in Bolzano is decreasing during the summer, falling by 1.2 kWh, from 6.4 kWh to 5.2 kWh, over the course of the season. The highest average daily incident shortwave solar energy during the summer is 6.7 kWh on July 7. TopographyFor the purposes of this report, the geographical coordinates of Bolzano are 46.491 deg latitude, 11.340 deg longitude, and 823 ft elevation. The topography within 2 miles of Bolzano contains extreme variations in elevation, with a maximum elevation change of 3,737 feet and an average elevation above sea level of 1,375 feet. Within 10 miles also contains extreme variations in elevation (6,368 feet). Within 50 miles also contains extreme variations in elevation (12,533 feet). The area within 2 miles of Bolzano is covered by artificial surfaces (44%), trees (35%), and cropland (17%), within 10 miles by trees (68%) and cropland (16%), and within 50 miles by trees (50%) and grassland (16%). Data SourcesThis report illustrates the typical weather in Bolzano, 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 Bolzano. For each station, the records are corrected for the elevation difference between that station and Bolzano 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 Bolzano is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Bolzano 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 Bolzano 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. |