Fall Weather at Niigata Airport Japan

Daily high temperatures decrease by 31°F, from 82°F to 51°F, rarely falling below 43°F or exceeding 88°F.

Daily low temperatures decrease by 30°F, from 71°F to 41°F, rarely falling below 35°F or exceeding 76°F.

For reference, on August 6, the hottest day of the year, temperatures at Niigata Airport typically range from 75°F to 85°F, while on January 28, the coldest day of the year, they range from 33°F to 40°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.

Brooklyn, United States (6,625 miles away) and Novokayakent, Russia (4,581 miles) are the far-away foreign places with temperatures most similar to Niigata Airport (view comparison).

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The fall at Niigata Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 50% throughout the season. The lowest chance of overcast or mostly cloudy conditions is 42% on October 22.

The clearest day of the fall is October 22, with clear, mostly clear, or partly cloudy conditions 58% of the time.

For reference, on January 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 80%, while on October 22, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 58%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Niigata Airport, the chance of a wet day over the course of the fall is very rapidly increasing, starting the season at 41% and ending it at 59%.

For reference, the year's highest daily chance of a wet day is 60% on December 8, and its lowest chance is 26% on June 1.

Over the course of the fall at Niigata Airport, the chance of a day with only rain increases from 41% to 58%, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout.

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 at Niigata Airport is gradually increasing, starting the season at 5.2 inches, when it rarely exceeds 8.4 inches or falls below 2.4 inches, and ending the season at 5.7 inches, when it rarely exceeds 8.1 inches or falls below 3.4 inches.

The highest average 31-day accumulation is 5.7 inches on November 28.

Over the course of the fall at Niigata Airport, 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 3 hours, 15 minutes, implying an average daily decrease of 2 minutes, 10 seconds, and weekly decrease of 15 minutes, 8 seconds.

The shortest day of the fall is November 30, with 9 hours, 45 minutes of daylight and the longest day is September 1, with 13 hours, 0 minutes of daylight.

The earliest sunrise of the fall at Niigata Airport is 5:13 AM on September 1 and the latest sunrise is 1 hour, 26 minutes later at 6:39 AM on November 30.

The latest sunset is 6:12 PM on September 1 and the earliest sunset is 1 hour, 48 minutes earlier at 4:24 PM on November 30.

Daylight saving time is not observed at Niigata Airport during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 4:21 AM and sets 14 hours, 48 minutes later, at 7:09 PM, while on December 21, the shortest day of the year, it rises at 6:55 AM and sets 9 hours, 32 minutes later, at 4:27 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 at Niigata Airport is very rapidly decreasing during the fall, falling from 73% to 0% over the course of the season.

For reference, on August 4, the muggiest day of the year, there are muggy conditions 94% 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 at Niigata Airport is very rapidly increasing during the fall, increasing from 6.2 miles per hour to 10.6 miles per hour over the course of the season.

For reference, on February 2, the windiest day of the year, the daily average wind speed is 12.9 miles per hour, while on July 28, the calmest day of the year, the daily average wind speed is 5.3 miles per hour.

The wind direction at Niigata Airport during the fall is predominantly out of the north from September 1 to October 5 and the west from October 5 to November 30.

Niigata Airport 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 Niigata Airport is very rapidly decreasing during the fall, falling by 17°F, from 78°F to 61°F, over the course of the season.

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 Niigata Airport typically lasts for 9.4 months (287 days), from around March 10 to around December 22, rarely starting before February 21 or after March 29, and rarely ending before December 1 or after January 9.

The fall at Niigata Airport 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 91% 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 at Niigata Airport are very rapidly increasing during the fall, increasing by 1,098°F, from 2,761°F to 3,859°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 at Niigata Airport is very rapidly decreasing during the fall, falling by 3.3 kWh, from 5.0 kWh to 1.7 kWh, over the course of the season.