September Weather at Cecil, Naval Air Station United States

Daily high temperatures decrease by 5°F, from 89°F to 84°F, rarely falling below 77°F or exceeding 93°F.

Daily low temperatures decrease by 5°F, from 72°F to 67°F, rarely falling below 58°F or exceeding 75°F.

For reference, on July 16, the hottest day of the year, temperatures at Cecil, Naval Air Station typically range from 73°F to 91°F, while on January 17, the coldest day of the year, they range from 43°F to 65°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.

Al Hadā, Saudi Arabia (7,206 miles away) is the far-away foreign place with temperatures most similar to Cecil, Naval Air Station (view comparison).

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The month of September at Cecil, Naval Air Station experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 55% to 44%.

The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 56% of the time.

For reference, on July 11, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 63%, while on October 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 66%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Cecil, Naval Air Station, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 51% and ending it at 36%.

For reference, the year's highest daily chance of a wet day is 63% on July 30, and its lowest chance is 17% on October 30.

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 at Cecil, Naval Air Station is rapidly decreasing, starting the month at 5.3 inches, when it rarely exceeds 9.2 inches or falls below 2.2 inches, and ending the month at 4.3 inches, when it rarely exceeds 7.7 inches or falls below 1.2 inches.

Over the course of September at Cecil, Naval Air Station, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 52 minutes, implying an average daily decrease of 1 minute, 48 seconds, and weekly decrease of 12 minutes, 34 seconds.

The shortest day of the month is September 30, with 11 hours, 53 minutes of daylight and the longest day is September 1, with 12 hours, 45 minutes of daylight.

The earliest sunrise of the month at Cecil, Naval Air Station is 7:04 AM on September 1 and the latest sunrise is 16 minutes later at 7:20 AM on September 30.

The latest sunset is 7:49 PM on September 1 and the earliest sunset is 36 minutes earlier at 7:13 PM on September 30.

Daylight saving time is observed at Cecil, Naval Air Station during 2024, but it neither starts nor ends during September, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 6:26 AM and sets 14 hours, 6 minutes later, at 8:32 PM, while on December 21, the shortest day of the year, it rises at 7:19 AM and sets 10 hours, 12 minutes later, at 5:31 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 at Cecil, Naval Air Station is very rapidly decreasing during September, falling from 96% to 71% over the course of the month.

For reference, on August 3, the muggiest day of the year, there are muggy conditions 99% of the time, while on January 27, the least muggy day of the year, there are muggy conditions 2% 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 at Cecil, Naval Air Station is gradually increasing during September, increasing from 5.1 miles per hour to 5.7 miles per hour over the course of the month.

For reference, on March 8, the windiest day of the year, the daily average wind speed is 6.6 miles per hour, while on August 5, the calmest day of the year, the daily average wind speed is 4.6 miles per hour.

The hourly average wind direction at Cecil, Naval Air Station throughout September is predominantly from the east, with a peak proportion of 47% on September 7.

Cecil, Naval Air Station 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 at Cecil, Naval Air Station is gradually decreasing during September, falling by 2°F, from 83°F to 80°F, over the course of the month.

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 at Cecil, Naval Air Station typically lasts for 9.5 months (289 days), from around February 17 to around December 2, rarely starting before January 23 or after March 14, and rarely ending before November 11 or after December 31.

The month of September at Cecil, Naval Air Station 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 at Cecil, Naval Air Station are rapidly increasing during September, increasing by 774°F, from 4,820°F to 5,594°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 at Cecil, Naval Air Station is essentially constant during September, remaining within 0.1 kWh of 4.9 kWh throughout.

For the purposes of this report, the geographical coordinates of Cecil, Naval Air Station are 30.212 deg latitude, -81.870 deg longitude, and 59 ft elevation.

The topography within 2 miles of Cecil, Naval Air Station is essentially flat, with a maximum elevation change of 62 feet and an average elevation above sea level of 71 feet. Within 10 miles is essentially flat (131 feet). Within 50 miles also contains only modest variations in elevation (285 feet).

The area within 2 miles of Cecil, Naval Air Station is covered by trees (61%), artificial surfaces (21%), and herbaceous vegetation (13%), within 10 miles by trees (44%) and artificial surfaces (32%), and within 50 miles by trees (39%) and herbaceous vegetation (27%).