Summer Weather in Tennō Japan

Daily high temperatures increase by 10°F, from 69°F to 79°F, rarely falling below 61°F or exceeding 88°F. The highest daily average high temperature is 82°F on August 10.

Daily low temperatures increase by 11°F, from 58°F to 68°F, rarely falling below 53°F or exceeding 76°F. The highest daily average low temperature is 72°F on August 7.

For reference, on August 10, the hottest day of the year, temperatures in Tennō typically range from 72°F to 82°F, while on January 28, the coldest day of the year, they range from 29°F to 36°F.

The figure below shows you a compact characterization of the hourly average summer 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.

Montauk, United States (6,503 miles away) is the far-away foreign place with temperatures most similar to Tennō (view comparison).

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The summer in Tennō experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 54% throughout the season. The highest chance of overcast or mostly cloudy conditions is 57% on July 20.

The clearest day of the summer is June 1, with clear, mostly clear, or partly cloudy conditions 50% of the time.

For reference, on January 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 81%, while on October 22, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 61%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Tennō, the chance of a wet day over the course of the summer is very rapidly increasing, starting the season at 29% and ending it at 44%.

For reference, the year's highest daily chance of a wet day is 52% on November 25, and its lowest chance is 29% on June 1.

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 summer in Tennō is very rapidly increasing, starting the season at 3.2 inches, when it rarely exceeds 5.3 inches or falls below 1.4 inches, and ending the season at 5.9 inches, when it rarely exceeds 9.5 inches or falls below 3.2 inches.

The highest average 31-day accumulation is 5.9 inches on August 29.

Over the course of the summer in Tennō, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 43 minutes, implying an average daily decrease of 1 minute, 8 seconds, and weekly decrease of 7 minutes, 55 seconds.

The shortest day of the summer is August 31, with 13 hours, 6 minutes of daylight and the longest day is June 21, with 15 hours, 0 minutes of daylight.

The earliest sunrise of the summer in Tennō is 4:11 AM on June 13 and the latest sunrise is 56 minutes later at 5:07 AM on August 31.

The latest sunset is 7:12 PM on June 27 and the earliest sunset is 1 hour, 0 minutes earlier at 6:13 PM on August 31.

Daylight saving time is not observed in Tennō during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 4:11 AM and sets 15 hours, 0 minutes later, at 7:11 PM, while on December 21, the shortest day of the year, it rises at 6:58 AM and sets 9 hours, 20 minutes later, at 4:18 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 summer 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 Tennō is very rapidly increasing during the summer, rising from 2% to 59% over the course of the season.

The highest chance of a muggy day during the summer is 85% on August 7.

For reference, on August 7, the muggiest day of the year, there are muggy conditions 85% 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 Tennō is essentially constant during the summer, remaining within 0.4 miles per hour of 7.9 miles per hour throughout.

For reference, on January 19, the windiest day of the year, the daily average wind speed is 16.0 miles per hour, while on July 29, the calmest day of the year, the daily average wind speed is 7.5 miles per hour.

The lowest daily average wind speed during the summer is 7.5 miles per hour on July 29.

The wind direction in Tennō during the summer is predominantly out of the south from June 1 to August 29 and the west from August 29 to August 31.

Tennō 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 in Tennō is very rapidly increasing during the summer, rising by 16°F, from 61°F to 77°F, over the course of the season.

The highest average surface water temperature during the summer is 77°F on August 22.

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 Tennō typically lasts for 8.4 months (255 days), from around March 23 to around December 3, rarely starting before March 8 or after April 7, and rarely ending before November 16 or after December 20.

The summer in Tennō 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 in Tennō are very rapidly increasing during the summer, increasing by 1,963°F, from 356°F to 2,318°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 Tennō is decreasing during the summer, falling by 1.4 kWh, from 6.3 kWh to 4.9 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the summer is 6.3 kWh on June 9.

For the purposes of this report, the geographical coordinates of Tennō are 39.900 deg latitude, 139.967 deg longitude, and 20 ft elevation.

The topography within 2 miles of Tennō contains only modest variations in elevation, with a maximum elevation change of 98 feet and an average elevation above sea level of 10 feet. Within 10 miles contains only modest variations in elevation (1,263 feet). Within 50 miles contains very significant variations in elevation (5,348 feet).

The area within 2 miles of Tennō is covered by water (48%) and cropland (42%), within 10 miles by water (48%) and cropland (28%), and within 50 miles by water (60%) and trees (32%).