Fall Weather in Deltana United States

Daily high temperatures decrease by 48°F, from 58°F to 9°F, rarely falling below -9°F or exceeding 65°F.

Daily low temperatures decrease by 45°F, from 42°F to -4°F, rarely falling below -23°F or exceeding 49°F.

For reference, on July 6, the hottest day of the year, temperatures in Deltana typically range from 52°F to 68°F, while on January 16, the coldest day of the year, they range from -6°F to 8°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.

Pyt-Yakh, Russia (3,605 miles away); Sorsk, Russia (3,775 miles); and Vidim, Russia (3,380 miles) are the far-away foreign places with temperatures most similar to Deltana (view comparison).

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The fall in Deltana experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 63% throughout the season. The highest chance of overcast or mostly cloudy conditions is 66% on September 26.

The clearest day of the fall is November 16, with clear, mostly clear, or partly cloudy conditions 40% of the time.

For reference, on September 26, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 66%, while on March 8, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 47%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Deltana, the chance of a wet day over the course of the fall is very rapidly decreasing, starting the season at 31% and ending it at 11%.

For reference, the year's highest daily chance of a wet day is 45% on July 2, and its lowest chance is 5% on March 17.

Over the course of the fall in Deltana, the chance of a day with only rain decreases from 30% to 0%, the chance of a day with mixed snow and rain remains an essentially constant 3% throughout, and the chance of a day with only snow increases from 0% to 10%.

Rainfall

To 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 Deltana is rapidly decreasing, starting the season at 1.9 inches, when it rarely exceeds 3.3 inches or falls below 0.8 inches, and ending the season at 0.0 inches, when it rarely exceeds 0.2 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during the fall in Deltana is rapidly increasing, starting the season at 0.4 inches, when it rarely exceeds 1.2 inches or falls below -0.0 inches, and ending the season at 4.5 inches, when it rarely exceeds 9.8 inches or falls below 0.7 inches.

The highest average 31-day accumulation is 4.8 inches on October 28.

Over the course of the fall in Deltana, 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 9 hours, 17 minutes, implying an average daily decrease of 6 minutes, 11 seconds, and weekly decrease of 43 minutes, 19 seconds.

The shortest day of the fall is November 30, with 5 hours, 9 minutes of daylight and the longest day is September 1, with 14 hours, 26 minutes of daylight.

The earliest sunrise of the fall in Deltana is 6:26 AM on September 1 and the latest sunrise is 3 hours, 28 minutes later at 9:54 AM on November 30.

The latest sunset is 8:52 PM on September 1 and the earliest sunset is 5 hours, 49 minutes earlier at 3:04 PM on November 30.

Daylight saving time (DST) starts at 1:00 AM on November 3, 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 3:14 AM and sets 20 hours, 55 minutes later, at 12:10 AM, while on December 21, the shortest day of the year, it rises at 10:31 AM and sets 4 hours, 16 minutes later, at 2:47 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 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.

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 Deltana is essentially constant during the fall, remaining around 0% throughout.

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 Deltana is increasing during the fall, increasing from 5.1 miles per hour to 6.2 miles per hour over the course of the season.

For reference, on January 8, the windiest day of the year, the daily average wind speed is 6.9 miles per hour, while on July 13, the calmest day of the year, the daily average wind speed is 4.7 miles per hour.

The hourly average wind direction in Deltana throughout the fall is predominantly from the south, with a peak proportion of 62% on November 25.

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 Deltana typically lasts for 3.8 months (116 days), from around May 14 to around September 7, rarely starting before April 29 or after May 30, and rarely ending before August 18 or after September 28.

During the fall in Deltana, the chance that a given day is within the growing season is very rapidly decreasing falling from 64% to -0% 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 Deltana are gradually increasing during the fall, increasing by 45°F, from 780°F to 826°F, over the course of the season.

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 Deltana is very rapidly decreasing during the fall, falling by 3.1 kWh, from 3.2 kWh to 0.1 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Deltana are 63.872 deg latitude, -145.218 deg longitude, and 1,220 ft elevation.

The topography within 2 miles of Deltana is essentially flat, with a maximum elevation change of 95 feet and an average elevation above sea level of 1,225 feet. Within 10 miles is essentially flat (4,495 feet). Within 50 miles also contains extreme variations in elevation (12,917 feet).

The area within 2 miles of Deltana is covered by trees (93%), within 10 miles by trees (42%) and cropland (21%), and within 50 miles by trees (39%) and shrubs (27%).