September Weather in Fredonia United States

Daily high temperatures decrease by 9°F, from 87°F to 78°F, rarely falling below 69°F or exceeding 93°F.

Daily low temperatures decrease by 10°F, from 57°F to 46°F, rarely falling below 38°F or exceeding 63°F.

For reference, on July 7, the hottest day of the year, temperatures in Fredonia typically range from 59°F to 94°F, while on January 3, the coldest day of the year, they range from 24°F to 47°F.

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.

An Nabk, Syria (7,157 miles away); Sanandaj, Iran (7,282 miles); and Shāhreẕā, Iran (7,574 miles) are the far-away foreign places with temperatures most similar to Fredonia (view comparison).

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The month of September in Fredonia experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 18% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 16% on September 18.

The clearest day of the month is September 18, with clear, mostly clear, or partly cloudy conditions 84% of the time.

For reference, on February 6, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 44%, while on September 18, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 84%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Fredonia, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 19% and ending it at 11%.

For reference, the year's highest daily chance of a wet day is 23% on August 10, and its lowest chance is 5% on June 15.

Rainfall

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 Fredonia is essentially constant, remaining about 1.0 inches throughout, and rarely exceeding 2.1 inches.

Over the course of September in Fredonia, 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, 7 minutes, implying an average daily decrease of 2 minutes, 19 seconds, and weekly decrease of 16 minutes, 14 seconds.

The shortest day of the month is September 30, with 11 hours, 49 minutes of daylight and the longest day is September 1, with 12 hours, 56 minutes of daylight.

The earliest sunrise of the month in Fredonia is 6:01 AM on September 1 and the latest sunrise is 24 minutes later at 6:25 AM on September 30.

The latest sunset is 6:57 PM on September 1 and the earliest sunset is 44 minutes earlier at 6:13 PM on September 30.

Daylight saving time is not observed in Fredonia during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:10 AM and sets 14 hours, 42 minutes later, at 7:52 PM, while on December 21, the shortest day of the year, it rises at 7:39 AM and sets 9 hours, 38 minutes later, at 5:17 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.

The figure below presents a compact representation of key lunar data for September 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.

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 Fredonia is essentially constant during September, remaining around 0% throughout.

For reference, on July 22, 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.

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 Fredonia is gradually increasing during September, increasing from 7.0 miles per hour to 7.6 miles per hour over the course of the month.

For reference, on April 10, the windiest day of the year, the daily average wind speed is 9.7 miles per hour, while on August 12, the calmest day of the year, the daily average wind speed is 6.7 miles per hour.

The highest daily average wind speed during September is 7.6 miles per hour on September 27.

The hourly average wind direction in Fredonia throughout September is predominantly from the west, with a peak proportion of 44% on September 1.

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 Fredonia typically lasts for 5.9 months (178 days), from around April 27 to around October 23, rarely starting before April 7 or after May 20, and rarely ending before October 3 or after November 11.

The month of September in Fredonia is very likely fully within the growing season, with the chance that a given day is in the growing season gradually decreasing from 100% to 93% over the course of the month.

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 Fredonia are rapidly increasing during September, increasing by 491°F, from 2,936°F to 3,427°F, over the course of the month.

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 Fredonia is gradually decreasing during September, falling by 0.8 kWh, from 6.4 kWh to 5.6 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Fredonia are 36.946 deg latitude, -112.527 deg longitude, and 4,669 ft elevation.

The topography within 2 miles of Fredonia contains only modest variations in elevation, with a maximum elevation change of 400 feet and an average elevation above sea level of 4,721 feet. Within 10 miles contains only modest variations in elevation (2,667 feet). Within 50 miles contains large variations in elevation (8,894 feet).

The area within 2 miles of Fredonia is covered by shrubs (82%) and grassland (11%), within 10 miles by shrubs (97%), and within 50 miles by shrubs (79%) and trees (17%).