October Weather in Ansan-si South Korea
Daily high temperatures decrease by 13°F, from 73°F to 60°F, rarely falling below 51°F or exceeding 79°F.
Daily low temperatures decrease by 12°F, from 56°F to 44°F, rarely falling below 35°F or exceeding 63°F.
For reference, on August 4, the hottest day of the year, temperatures in Ansan-si typically range from 74°F to 85°F, while on January 18, the coldest day of the year, they range from 20°F to 34°F.
Average High and Low Temperature in October in Ansan-si
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. 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 October in Ansan-si
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 month of October in Ansan-si experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 35% to 30%. The lowest chance of overcast or mostly cloudy conditions is 28% on October 20.
The clearest day of the month is October 20, with clear, mostly clear, or partly cloudy conditions 72% of the time.
For reference, on July 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 55%, while on October 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%.
Cloud Cover Categories in October in Ansan-si
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Ansan-si, the chance of a wet day over the course of October is essentially constant, remaining around 17% throughout.
For reference, the year's highest daily chance of a wet day is 52% on July 22, and its lowest chance is 9% on January 22.
Probability of Precipitation in October in Ansan-si
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 October in Ansan-si is rapidly decreasing, starting the month at 3.1 inches, when it rarely exceeds 6.8 inches or falls below 0.5 inches, and ending the month at 1.8 inches, when it rarely exceeds 3.5 inches or falls below 0.4 inches.
Average Monthly Rainfall in October in Ansan-si
Over the course of October in Ansan-si, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 8 minutes, implying an average daily decrease of 2 minutes, 17 seconds, and weekly decrease of 15 minutes, 57 seconds.
The shortest day of the month is October 31, with 10 hours, 40 minutes of daylight and the longest day is October 1, with 11 hours, 48 minutes of daylight.
Hours of Daylight and Twilight in October in Ansan-si
The earliest sunrise of the month in Ansan-si is 6:27 AM on October 1 and the latest sunrise is 28 minutes later at 6:56 AM on October 31.
The latest sunset is 6:16 PM on October 1 and the earliest sunset is 40 minutes earlier at 5:36 PM on October 31.
Daylight saving time is not observed in Ansan-si during 2021.
For reference, on June 21, the longest day of the year, the Sun rises at 5:12 AM and sets 14 hours, 44 minutes later, at 7:56 PM, while on December 21, the shortest day of the year, it rises at 7:42 AM and sets 9 hours, 35 minutes later, at 5:18 PM.
Sunrise & Sunset with Twilight in October in Ansan-si
The figure below presents a compact representation of key lunar data for October 2021. 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 October in Ansan-si
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 Ansan-si is decreasing during October, falling from 5% to 0% over the course of the month.
For reference, on August 3, the muggiest day of the year, there are muggy conditions 95% 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 October in Ansan-si
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Ansan-si is increasing during October, increasing from 7.9 miles per hour to 9.3 miles per hour over the course of the month.
For reference, on December 25, the windiest day of the year, the daily average wind speed is 10.3 miles per hour, while on June 14, the calmest day of the year, the daily average wind speed is 6.9 miles per hour.
Average Wind Speed in October in Ansan-si
The hourly average wind direction in Ansan-si throughout October is predominantly from the north, with a peak proportion of 34% on October 16.
Wind Direction in October in Ansan-si
Ansan-si 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 Ansan-si is rapidly decreasing during October, falling by 8°F, from 71°F to 63°F, over the course of the month.
Average Water Temperature in October in Ansan-si
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 Ansan-si typically lasts for 7.5 months (228 days), from around March 27 to around November 10, rarely starting before March 12 or after April 11, and rarely ending before October 25 or after November 26.
The month of October in Ansan-si is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly decreasing from 100% to 78% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in October in Ansan-si
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
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 Ansan-si are increasing during October, increasing by 265°F, from 3,494°F to 3,758°F, over the course of the month.
Growing Degree Days in October in Ansan-si
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 Ansan-si is decreasing during October, falling by 1.1 kWh, from 4.5 kWh to 3.4 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in October in Ansan-si
For the purposes of this report, the geographical coordinates of Ansan-si are 37.324 deg latitude, 126.822 deg longitude, and 49 ft elevation.
The topography within 2 miles of Ansan-si contains significant variations in elevation, with a maximum elevation change of 633 feet and an average elevation above sea level of 78 feet. Within 10 miles contains significant variations in elevation (1,578 feet). Within 50 miles contains very significant variations in elevation (3,911 feet).
The area within 2 miles of Ansan-si is covered by sparse vegetation (51%), trees (27%), and grassland (18%), within 10 miles by trees (23%) and sparse vegetation (20%), and within 50 miles by water (31%) and trees (26%).
This report illustrates the typical weather in Ansan-si, 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
There are 6 weather stations near enough to contribute to our estimation of the temperature and dew point in Ansan-si.
For each station, the records are corrected for the elevation difference between that station and Ansan-si according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Ansan-si is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Ansan-si and a given station.
The stations contributing to this reconstruction are: Suwon Ab (RKSW, 31%, 19 kilometers, southeast); Gimpo International Airport (RKSS, 19%, 26 kilometers, north); Seoul Air Base (RKSM, 16%, 29 kilometers, northeast); Seoul (RKSL, 15%, 30 kilometers, northeast); Incheon International Airport (RKSI, 12%, 37 kilometers, northwest); and Mangilsan Ab (RKTM, 6%, 55 kilometers, southwest).
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 © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
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.