Average Weather in September in Star Idaho, United States
Daily high temperatures decrease by 12°F, from 84°F to 72°F, rarely falling below 59°F or exceeding 93°F.
Daily low temperatures decrease by 8°F, from 53°F to 44°F, rarely falling below 35°F or exceeding 61°F.
For reference, on July 26, the hottest day of the year, temperatures in Star typically range from 60°F to 92°F, while on December 31, the coldest day of the year, they range from 23°F to 35°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 Star experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 22% to 32%.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 78% of the time.
For reference, on January 11, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 59%, while on July 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 84%.
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 Star, the chance of a wet day over the course of September is gradually increasing, starting the month at 6% and ending it at 10%.
For reference, the year's highest daily chance of a wet day is 26% on November 30, and its lowest chance is 3% on July 27.
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 Star is gradually increasing, starting the month at 0.3 inches, when it rarely exceeds 0.9 inches or falls below -0.0 inches, and ending the month at 0.6 inches, when it rarely exceeds 1.3 inches.
Average Monthly Rainfall in September
Over the course of September in Star, 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, 26 minutes, implying an average daily decrease of 2 minutes, 57 seconds, and weekly decrease of 20 minutes, 39 seconds.
The shortest day of the month is September 30, with 11 hours, 44 minutes of daylight and the longest day is September 1, with 13 hours, 10 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Star is 7:10 AM on September 1 and the latest sunrise is 33 minutes later at 7:43 AM on September 30.
The latest sunset is 8:20 PM on September 1 and the earliest sunset is 53 minutes earlier at 7:27 PM on September 30.
Daylight saving time is observed in Star during 2020, but it neither starts nor ends during September, so the entire month is in daylight saving time.
For reference, on June 20, the longest day of the year, the Sun rises at 6:04 AM and sets 15 hours, 27 minutes later, at 9:31 PM, while on December 21, the shortest day of the year, it rises at 8:16 AM and sets 8 hours, 55 minutes later, at 5:12 PM.
Sunrise & Sunset with Twilight 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 Star is essentially constant during September, remaining around 0% throughout.
For reference, on August 4, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, 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 Star is essentially constant during September, remaining within 0.1 miles per hour of 5.9 miles per hour throughout.
For reference, on March 30, the windiest day of the year, the daily average wind speed is 7.3 miles per hour, while on September 14, the calmest day of the year, the daily average wind speed is 5.8 miles per hour.
The lowest daily average wind speed during September is 5.8 miles per hour on September 14.
Average Wind Speed in September
The hourly average wind direction in Star throughout September is predominantly from the west, with a peak proportion of 39% on September 2.
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 Star typically lasts for 5.6 months (170 days), from around April 24 to around October 12, rarely starting before April 3 or after May 16, and rarely ending before September 22 or after November 4.
The month of September in Star is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly decreasing from 100% to 77% over the course of the month.
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 Star are increasing during September, increasing by 376°F, from 2,381°F to 2,758°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 Star is rapidly decreasing during September, falling by 1.7 kWh, from 6.2 kWh to 4.6 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 Star are 43.692 deg latitude, -116.493 deg longitude, and 2,487 ft elevation.
The topography within 2 miles of Star contains only modest variations in elevation, with a maximum elevation change of 98 feet and an average elevation above sea level of 2,472 feet. Within 10 miles contains only modest variations in elevation (997 feet). Within 50 miles contains very significant variations in elevation (6,736 feet).
The area within 2 miles of Star is covered by cropland (91%), within 10 miles by cropland (53%) and grassland (27%), and within 50 miles by shrubs (46%) and grassland (26%).
This report illustrates the typical weather in Star 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 Star.
For each station, the records are corrected for the elevation difference between that station and Star 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 Star is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Star and a given station.
The stations contributing to this reconstruction are: Caldwell Industrial Airport (44%, 12 kilometers, southwest); Nampa Municipal Airport (42%, 13 kilometers, south); and Boise Air Terminal (14%, 25 kilometers, southeast).
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 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.