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December Weather at Ashiya Ab Japan

Daily high temperatures decrease by 7°F, from 56°F to 50°F, rarely falling below 42°F or exceeding 63°F.

Daily low temperatures decrease by 6°F, from 44°F to 38°F, rarely falling below 32°F or exceeding 52°F.

For reference, on August 4, the hottest day of the year, temperatures at Ashiya Ab typically range from 76°F to 87°F, while on January 26, the coldest day of the year, they range from 37°F to 47°F.

Average High and Low Temperature in December at Ashiya Ab

Average High and Low Temperature in December at Ashiya AbDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313130°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°FNovJanDec 156°FDec 156°F44°F44°FDec 3150°FDec 3150°F38°F38°FDec 1154°FDec 1154°F42°F42°FDec 2151°FDec 2151°F40°F40°F
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. 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.

Average Hourly Temperature in December at Ashiya Ab

Average Hourly Temperature in December at Ashiya AbDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJanvery coldvery coldcoldcoolcool
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Southern Shores, North Carolina, United States (7,316 miles away); Belen, Turkey (5,102 miles); and Langarūd, Iran (4,392 miles) are the far-away foreign places with temperatures most similar to Ashiya Ab (view comparison).

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The month of December at Ashiya Ab experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 29% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 28% on December 14.

The clearest day of the month is December 14, with clear, mostly clear, or partly cloudy conditions 72% of the time.

For reference, on July 1, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 72%, while on December 14, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%.

Cloud Cover Categories in December at Ashiya Ab

Cloud Cover Categories in December at Ashiya AbDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanJul 128%Jul 128%Dec 171%Dec 171%Dec 3170%Dec 3170%Dec 1172%Dec 1172%Dec 2171%Dec 2171%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Ashiya Ab, the chance of a wet day over the course of December is gradually decreasing, starting the month at 23% and ending it at 21%.

For reference, the year's highest daily chance of a wet day is 56% on July 1, and its lowest chance is 20% on January 23.

Probability of Precipitation in December at Ashiya Ab

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

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 December at Ashiya Ab is decreasing, starting the month at 2.5 inches, when it rarely exceeds 4.7 inches or falls below 0.8 inches, and ending the month at 1.9 inches, when it rarely exceeds 3.6 inches or falls below 0.6 inches.

The lowest average 31-day accumulation is 1.9 inches on December 28.

Average Monthly Rainfall in December at Ashiya Ab

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of December at Ashiya Ab, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 54 minutes of daylight and the longest day is December 1, with 10 hours, 4 minutes of daylight.

Hours of Daylight and Twilight in December at Ashiya Ab

Hours of Daylight and Twilight in December at Ashiya AbDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 219 hr, 54 minDec 219 hr, 54 minnightnightdaydayDec 110 hr, 4 minDec 110 hr, 4 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the month at Ashiya Ab is 7:04 AM on December 1 and the latest sunrise is 18 minutes later at 7:22 AM on December 31.

The earliest sunset is 5:08 PM on December 4 and the latest sunset is 10 minutes later at 5:18 PM on December 31.

Daylight saving time is not observed at Ashiya Ab during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:06 AM and sets 14 hours, 25 minutes later, at 7:31 PM, while on December 21, the shortest day of the year, it rises at 7:18 AM and sets 9 hours, 54 minutes later, at 5:12 PM.

Sunrise & Sunset with Twilight in December at Ashiya Ab

The solar day over the course of December. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

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.

Solar Elevation and Azimuth in December at Ashiya Ab

Solar Elevation and Azimuth in December at Ashiya AbDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJan001010202020303000010102020303030
northeastsouthwest
Solar elevation and azimuth over the course of December 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

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

Moon Rise, Set & Phases in December at Ashiya Ab

Moon Rise, Set & Phases in December at Ashiya AbDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanNov 19:48 PMNov 19:48 PMNov 166:29 AMNov 166:29 AMDec 13:22 PMDec 13:22 PMDec 156:02 PMDec 156:02 PMDec 317:28 AMDec 317:28 AMJan 147:28 AMJan 147:28 AMJan 299:37 PMJan 299:37 PM6:09 AM6:09 AM5:03 PM5:03 PM4:29 PM4:29 PM7:04 AM7:04 AM7:00 AM7:00 AM4:48 PM4:48 PM4:43 PM4:43 PM8:12 AM8:12 AM7:46 AM7:46 AM5:23 PM5:23 PM4:34 PM4:34 PM7:46 AM7:46 AM7:12 AM7:12 AM5:21 PM5:21 PM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Dec 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
0%7:00 AMESE4:48 PMWSW-11:54 AMS246,513 mi
2
1%8:02 AMSE5:35 PMSW-12:48 PMS244,487 mi
3
4%9:00 AMSE6:31 PMSW-1:46 PMS242,376 mi
4
9%9:53 AMSE7:34 PMWSW-2:43 PMS240,234 mi
5
16%10:39 AMESE8:40 PMWSW-3:40 PMS238,088 mi
6
25%11:18 AMESE9:47 PMWSW-4:33 PMS235,955 mi
7
36%11:53 AMESE10:55 PMWSW-5:23 PMS233,858 mi
8
47%12:23 PMESE--6:11 PMS231,847 mi
9
50%-12:01 AMW12:52 PME6:58 PMS230,012 mi
10
70%-1:08 AMW1:20 PME7:46 PMS228,486 mi
11
81%-2:16 AMW1:50 PMENE8:35 PMS227,433 mi
12
89%-3:26 AMWNW2:23 PMENE9:27 PMS227,027 mi
13
96%-4:39 AMWNW3:02 PMENE10:24 PMS227,412 mi
14
99%-5:54 AMWNW3:48 PMENE11:25 PMS228,667 mi
15
100%-7:06 AMNW4:43 PMNE--
16
100%-8:12 AMNW5:46 PMNE12:27 AMS230,765 mi
17
98%-9:08 AMWNW6:53 PMENE1:29 AMS233,567 mi
18
93%-9:55 AMWNW8:00 PMENE2:27 AMS236,836 mi
19
87%-10:32 AMWNW9:05 PMENE3:20 AMS240,286 mi
20
79%-11:04 AMWNW10:06 PMENE4:08 AMS243,619 mi
21
70%-11:31 AMWNW11:04 PME4:51 AMS246,568 mi
22
60%-11:55 AMW-5:32 AMS248,917 mi
23
50%12:00 AME12:18 PMW-6:11 AMS250,512 mi
24
41%12:55 AME12:41 PMW-6:49 AMS251,271 mi
25
32%1:51 AMESE1:06 PMWSW-7:29 AMS251,181 mi
26
23%2:48 AMESE1:33 PMWSW-8:11 AMS250,293 mi
27
15%3:47 AMESE2:05 PMWSW-8:56 AMS248,720 mi
28
9%4:48 AMESE2:42 PMWSW-9:45 AMS246,621 mi
29
4%5:50 AMESE3:28 PMSW-10:38 AMS244,185 mi
30
1%6:50 AMSE4:21 PMSW-11:36 AMS241,614 mi
31
0%7:46 AMSE5:23 PMWSW-12:34 PMS239,101 mi

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 Ashiya Ab is essentially constant during December, remaining around 0% throughout.

For reference, on August 2, the muggiest day of the year, there are muggy conditions 99% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in December at Ashiya Ab

Humidity Comfort Levels in December at Ashiya AbDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%NovJanDec 10%Dec 10%Dec 310%Dec 310%Dec 110%Dec 110%Dec 210%Dec 210%drydrycomfortablecomfortablehumidhumid
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 Ashiya Ab is increasing during December, increasing from 11.4 miles per hour to 12.4 miles per hour over the course of the month.

For reference, on January 14, the windiest day of the year, the daily average wind speed is 12.5 miles per hour, while on June 2, the calmest day of the year, the daily average wind speed is 7.8 miles per hour.

Average Wind Speed in December at Ashiya Ab

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction at Ashiya Ab throughout December is predominantly from the west, with a peak proportion of 48% on December 25.

Wind Direction in December at Ashiya Ab

Wind Direction in December at Ashiya AbNWDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%NovJanwestnortheastsouth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Ashiya Ab 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 Ashiya Ab is decreasing during December, falling by 4°F, from 66°F to 61°F, over the course of the month.

Average Water Temperature in December at Ashiya Ab

Average Water Temperature in December at Ashiya AbDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313154°F54°F56°F56°F58°F58°F60°F60°F62°F62°F64°F64°F66°F66°F68°F68°F70°F70°F72°F72°F74°F74°FNovJanDec 166°FDec 166°FDec 3161°FDec 3161°FDec 1164°FDec 1164°FDec 2163°FDec 2163°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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 Ashiya Ab typically lasts for 10.0 months (302 days), from around February 26 to around December 24, rarely starting before January 31 or after March 18, and rarely ending before December 5 or after January 9.

The month of December at Ashiya Ab is very likely fully outside of the growing season, with the chance that a given day is in the growing season very rapidly decreasing from 95% to 30% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in December at Ashiya Ab

Time Spent in Various Temperature Bands and the Growing Season in December at Ashiya Abgrowing seasonDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJan95%Dec 195%Dec 1Dec 3130%Dec 3130%83%Dec 1183%Dec 1158%Dec 2158%Dec 21very coldcoldcoolcomfortablefreezing
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is 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 Ashiya Ab are gradually increasing during December, increasing by 47°F, from 4,622°F to 4,669°F, over the course of the month.

Growing Degree Days in December at Ashiya Ab

The average growing degree days accumulated over the course of December, with 25th to 75th and 10th to 90th percentile bands.

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 Ashiya Ab is essentially constant during December, remaining within 0.1 kWh of 2.6 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 2.6 kWh on December 24.

Average Daily Incident Shortwave Solar Energy in December at Ashiya Ab

Average Daily Incident Shortwave Solar Energy in December at Ashiya AbDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 kWh0.0 kWh0.5 kWh0.5 kWh1.0 kWh1.0 kWh1.5 kWh1.5 kWh2.0 kWh2.0 kWh2.5 kWh2.5 kWh3.0 kWh3.0 kWh3.5 kWh3.5 kWh4.0 kWh4.0 kWh4.5 kWh4.5 kWhNovJanDec 242.6 kWhDec 242.6 kWhDec 12.7 kWhDec 12.7 kWhDec 112.6 kWhDec 112.6 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Ashiya Ab are 33.883 deg latitude, 130.653 deg longitude, and 92 ft elevation.

The topography within 2 miles of Ashiya Ab contains only modest variations in elevation, with a maximum elevation change of 249 feet and an average elevation above sea level of 25 feet. Within 10 miles contains only modest variations in elevation (2,090 feet). Within 50 miles contains large variations in elevation (4,003 feet).

The area within 2 miles of Ashiya Ab is covered by water (43%), cropland (38%), and trees (16%), within 10 miles by water (54%) and cropland (22%), and within 50 miles by water (65%) and trees (23%).

This report illustrates the typical weather at Ashiya Ab, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

Ashiya Ab has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back are Kitakyushu Airport, Fukuoka Airport, Ozuki Ab, Tsuiki Ab, Saga Airport, Hofu Ab, and Nagasaki Airport.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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