Fall Weather in San Marino San MarinoDaily high temperatures decrease by 30°F, from 79°F to 49°F, rarely falling below 41°F or exceeding 86°F. Daily low temperatures decrease by 23°F, from 61°F to 38°F, rarely falling below 30°F or exceeding 67°F. For reference, on August 1, the hottest day of the year, temperatures in San Marino typically range from 65°F to 84°F, while on January 14, the coldest day of the year, they range from 32°F to 44°F. The figure below shows you a compact characterization of the hourly average fall 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. CloudsThe fall in San Marino experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 30% to 57%. The highest chance of overcast or mostly cloudy conditions is 57% on November 27. The clearest day of the fall is September 1, with clear, mostly clear, or partly cloudy conditions 70% of the time. For reference, on November 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 57%, while on July 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 82%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In San Marino, the chance of a wet day over the course of the fall is increasing, starting the season at 23% and ending it at 27%. For reference, the year's highest daily chance of a wet day is 30% on November 15, and its lowest chance is 14% on July 14. 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 fall in San Marino is gradually increasing, starting the season at 2.1 inches, when it rarely exceeds 3.9 inches or falls below 0.7 inches, and ending the season at 2.6 inches, when it rarely exceeds 4.8 inches or falls below 0.5 inches. The highest average 31-day accumulation is 2.9 inches on November 13. SunOver the course of the fall in San Marino, 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 4 hours, 2 minutes, implying an average daily decrease of 2 minutes, 41 seconds, and weekly decrease of 18 minutes, 48 seconds. The shortest day of the fall is November 30, with 9 hours, 10 minutes of daylight and the longest day is September 1, with 13 hours, 12 minutes of daylight. The earliest sunrise of the fall in San Marino is 6:33 AM on September 1 and the latest sunrise is 1 hour, 5 minutes later at 7:39 AM on October 26. The latest sunset is 7:45 PM on September 1 and the earliest sunset is 3 hours, 12 minutes earlier at 4:33 PM on November 30. Daylight saving time (DST) starts at 2:00 AM on October 27, 2024, shifting sunrise and sunset to be an hour later. For reference, on June 20, the longest day of the year, the Sun rises at 5:27 AM and sets 15 hours, 29 minutes later, at 8:56 PM, while on December 21, the shortest day of the year, it rises at 7:41 AM and sets 8 hours, 54 minutes later, at 4:35 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 fall 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 San Marino is very rapidly decreasing during the fall, falling from 32% to 0% over the course of the season. For reference, on August 6, the muggiest day of the year, there are muggy conditions 51% 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 San Marino is rapidly increasing during the fall, increasing from 7.5 miles per hour to 9.5 miles per hour over the course of the season. For reference, on February 3, the windiest day of the year, the daily average wind speed is 10.0 miles per hour, while on August 10, the calmest day of the year, the daily average wind speed is 6.8 miles per hour. The wind direction in San Marino during the fall is predominantly out of the east from September 1 to November 24 and the north from November 24 to November 30. Water TemperatureSan Marino 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 surface water temperature in San Marino is very rapidly decreasing during the fall, falling by 18°F, from 76°F to 58°F, over the course of the season. 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 San Marino typically lasts for 8.3 months (255 days), from around March 15 to around November 25, rarely starting before February 19 or after April 4, and rarely ending before November 6 or after December 18. During the fall in San Marino, the chance that a given day is within the growing season is very rapidly decreasing falling from 100% to 38% over the course of the 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 San Marino are rapidly increasing during the fall, increasing by 803°F, from 2,684°F to 3,487°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 San Marino is very rapidly decreasing during the fall, falling by 3.9 kWh, from 5.4 kWh to 1.5 kWh, over the course of the season. TopographyFor the purposes of this report, the geographical coordinates of San Marino are 43.937 deg latitude, 12.446 deg longitude, and 0 ft elevation. The topography within 2 miles of San Marino is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet). The area within 2 miles of San Marino is covered by cropland (52%), trees (37%), and artificial surfaces (11%), within 10 miles by cropland (69%) and trees (22%), and within 50 miles by cropland (37%) and water (30%). Data SourcesThis report illustrates the typical weather in San Marino, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. The details of the data sources used for this report can be found on the Serravalle page. 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. 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