Average Weather in September in San Daniele Po Italy
Daily high temperatures decrease by 10°F, from 82°F to 72°F, rarely falling below 64°F or exceeding 89°F.
Daily low temperatures decrease by 7°F, from 62°F to 55°F, rarely falling below 49°F or exceeding 68°F.
For reference, on July 26, the hottest day of the year, temperatures in San Daniele Po typically range from 66°F to 87°F, while on January 11, the coldest day of the year, they range from 30°F to 41°F.
Average High and Low Temperature in September
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. 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.
Average Hourly Temperature in September
The month of September in San Daniele Po experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 31% to 43%.
The clearest day of the month is September 2, with clear, mostly clear, or partly cloudy conditions 69% of the time.
For reference, on November 25, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on July 21, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 78%.
Cloud Cover Categories in September
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. In San Daniele Po, the chance of a wet day over the course of September is increasing, starting the month at 21% and ending it at 26%.
For reference, the year's highest daily chance of a wet day is 31% on May 1, and its lowest chance is 16% on January 21.
Probability of Precipitation in September
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during September in San Daniele Po is increasing, starting the month at 2.3 inches, when it rarely exceeds 4.1 inches or falls below 0.6 inches, and ending the month at 3.1 inches, when it rarely exceeds 6.1 inches or falls below 0.7 inches.
Average Monthly Rainfall in September
Over the course of September in San Daniele Po, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 30 minutes, implying an average daily decrease of 3 minutes, 6 seconds, and weekly decrease of 21 minutes, 40 seconds.
The shortest day of the month is September 30, with 11 hours, 46 minutes of daylight and the longest day is September 1, with 13 hours, 16 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in San Daniele Po is 6:40 AM on September 1 and the latest sunrise is 35 minutes later at 7:15 AM on September 30.
The latest sunset is 7:56 PM on September 1 and the earliest sunset is 55 minutes earlier at 7:02 PM on September 30.
Daylight saving time is observed in San Daniele Po during 2018, but it neither starts nor ends during September, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:32 AM and sets 15 hours, 38 minutes later, at 9:09 PM, while on December 21, the shortest day of the year, it rises at 7:54 AM and sets 8 hours, 45 minutes later, at 4:40 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in September
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.
The chance that a given day will be muggy in San Daniele Po is rapidly decreasing during September, falling from 16% to 3% over the course of the month.
For reference, on July 27, the muggiest day of the year, there are muggy conditions 36% of the time, while on November 21, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in September
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 in San Daniele Po is essentially constant during September, remaining within 0.1 miles per hour of 5.1 miles per hour throughout.
For reference, on March 30, the windiest day of the year, the daily average wind speed is 6.4 miles per hour, while on August 5, the calmest day of the year, the daily average wind speed is 4.6 miles per hour.
Average Wind Speed in September
Wind Direction in September
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).
The growing season in San Daniele Po typically lasts for 8.3 months (253 days), from around March 13 to around November 21, rarely starting before February 18 or after April 3, and rarely ending before November 1 or after December 13.
The month of September in San Daniele Po is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in September
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 Daniele Po are rapidly increasing during September, increasing by 508°F, from 2,936°F to 3,443°F, over the course of the month.
Growing Degree Days in September
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 in San Daniele Po is rapidly decreasing during September, falling by 1.6 kWh, from 5.4 kWh to 3.9 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of San Daniele Po are 45.067 deg latitude, 10.176 deg longitude, and 98 ft elevation.
The topography within 2 miles of San Daniele Po is essentially flat, with a maximum elevation change of 95 feet and an average elevation above sea level of 99 feet. Within 10 miles is essentially flat (171 feet). Within 50 miles contains only modest variations in elevation (6,391 feet).
The area within 2 miles of San Daniele Po is covered by cropland (89%), within 10 miles by cropland (88%), and within 50 miles by cropland (67%) and trees (21%).
This report illustrates the typical weather in San Daniele Po year round, 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
There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in San Daniele Po.
For each station, the records are corrected for the elevation difference between that station and San Daniele Po 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 San Daniele Po is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between San Daniele Po and a given station.
The stations contributing to this reconstruction are: Parma Airport (46%, 29 kilometers, south); Piacenza-San Damiano Air Base (27%, 40 kilometers, southwest); and Brescia / Ghedi (26%, 41 kilometers, north).
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.