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Winter Weather at Lan Yu Taiwan

Daily high temperatures are around 71°F, rarely falling below 63°F or exceeding 78°F. The lowest daily average high temperature is 69°F on January 25.

Daily low temperatures are around 65°F, rarely falling below 58°F or exceeding 71°F. The lowest daily average low temperature is 63°F on January 28.

For reference, on July 9, the hottest day of the year, temperatures at Lan Yu typically range from 77°F to 83°F, while on January 28, the coldest day of the year, they range from 63°F to 69°F.

Average High and Low Temperature in the Winter at Lan Yu

Average High and Low Temperature in the Winter at Lan YuDecJanFeb56°F56°F58°F58°F60°F60°F62°F62°F64°F64°F66°F66°F68°F68°F70°F70°F72°F72°F74°F74°F76°F76°F78°F78°F80°F80°F82°F82°FFallSpringJan 2269°FJan 2269°F63°F63°FDec 173°FDec 173°F67°F67°FFeb 2872°FFeb 2872°F65°F65°FJan 170°FJan 170°F64°F64°FNowNow
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 winter 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.

Average Hourly Temperature in the Winter at Lan Yu

Average Hourly Temperature in the Winter at Lan YuDecJanFeb12 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 AMFallSpringNowNowcoolcomfortable
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.

Clémencia, Mauritius (5,209 miles away) and Nouméa, New Caledonia (4,308 miles) are the far-away foreign places with temperatures most similar to Lan Yu (view comparison).

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The winter at Lan Yu experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 38% throughout the season. The lowest chance of overcast or mostly cloudy conditions is 36% on December 10.

The clearest day of the winter is December 10, with clear, mostly clear, or partly cloudy conditions 64% of the time.

For reference, on June 6, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 86%, while on December 10, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 64%.

Cloud Cover Categories in the Winter at Lan Yu

Cloud Cover Categories in the Winter at Lan YuDecJanFeb0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpringJun 614%Jun 614%Dec 162%Dec 162%Feb 2863%Feb 2863%Jan 162%Jan 162%Feb 161%Feb 161%NowNowclearmostly 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 Lan Yu, the chance of a wet day over the course of the winter is essentially constant, remaining around 14% throughout.

For reference, the year's highest daily chance of a wet day is 63% on August 17, and its lowest chance is 11% on December 27.

Probability of Precipitation in the Winter at Lan Yu

Probability of Precipitation in the Winter at Lan YuDecJanFeb0%0%5%5%10%10%15%15%20%20%25%25%FallSpringDec 2611%Dec 2611%Dec 117%Dec 117%Feb 2817%Feb 2817%Feb 112%Feb 112%NowNowrain
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 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 winter at Lan Yu is decreasing, starting the season at 1.3 inches, when it rarely exceeds 3.2 inches or falls below 0.1 inches, and ending the season at 0.8 inches, when it rarely exceeds 1.8 inches or falls below 0.1 inches.

The lowest average 31-day accumulation is 0.6 inches on January 15.

Average Monthly Rainfall in the Winter at Lan Yu

Average Monthly Rainfall in the Winter at Lan YuDecJanFeb0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 inFallSpringJan 150.6 inJan 150.6 inDec 11.3 inDec 11.3 inFeb 280.8 inFeb 280.8 inJan 10.7 inJan 10.7 inFeb 10.7 inFeb 10.7 inNowNow
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 the winter at Lan Yu, the length of the day is increasing. From the start to the end of the season, the length of the day increases by 48 minutes, implying an average daily increase of 33 seconds, and weekly increase of 3 minutes, 48 seconds.

The shortest day of the winter is December 20, with 10 hours, 47 minutes of daylight and the longest day is February 28, with 11 hours, 41 minutes of daylight.

Hours of Daylight and Twilight in the Winter at Lan Yu

Hours of Daylight and Twilight in the Winter at Lan YuDecJanFeb0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrFallSpringDec 2110 hr, 47 minDec 2110 hr, 47 minnightnightdaydayFeb 2811 hr, 41 minFeb 2811 hr, 41 minFeb 111 hr, 11 minFeb 111 hr, 11 minNowNow
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 latest sunrise of the winter at Lan Yu is 6:35 AM on January 16 and the earliest sunrise is 19 minutes earlier at 6:15 AM on February 28.

The earliest sunset is 5:09 PM on December 1 and the latest sunset is 48 minutes later at 5:57 PM on February 28.

Daylight saving time is not observed at Lan Yu during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:11 AM and sets 13 hours, 29 minutes later, at 6:39 PM, while on December 21, the shortest day of the year, it rises at 6:28 AM and sets 10 hours, 47 minutes later, at 5:15 PM.

Sunrise & Sunset with Twilight in the Winter at Lan Yu

Sunrise & Sunset with Twilight in the Winter at Lan YuDecJanFeb12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMFallSpring6:15 AM6:15 AMFeb 285:57 PMFeb 285:57 PM6:16 AM6:16 AMDec 15:09 PMDec 15:09 PM6:35 AM6:35 AMJan 165:32 PMJan 165:32 PM6:32 AM6:32 AMFeb 15:42 PMFeb 15:42 PMSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day in the winter. 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 the Winter at Lan Yu

Solar Elevation and Azimuth in the Winter at Lan YuDecJanFeb12 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 AMFallSpring0010202030304050001010203030404060NowNow
northeastsouthwest
Solar elevation and azimuth in the the winter of 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 the winter 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.

Moon Rise, Set & Phases in the Winter at Lan Yu

Moon Rise, Set & Phases in the Winter at Lan YuDecJanFeb12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMFallSpringNov 18:48 PMNov 18:48 PMNov 165:29 AMNov 165:29 AMDec 12:22 PMDec 12:22 PMDec 155:02 PMDec 155:02 PMDec 316:28 AMDec 316:28 AMJan 146:28 AMJan 146:28 AMJan 298:37 PMJan 298:37 PMFeb 129:54 PMFeb 129:54 PMFeb 288:45 AMFeb 288:45 AMMar 142:55 PMMar 142:55 PMMar 296:58 PMMar 296:58 PM5:30 AM5:30 AM4:30 PM4:30 PM6:15 AM6:15 AM6:07 AM6:07 AM4:58 PM4:58 PM4:57 PM4:57 PM7:14 AM7:14 AM6:48 AM6:48 AM4:46 PM4:46 PM6:52 AM6:52 AM6:21 AM6:21 AM5:26 PM5:26 PM5:35 PM5:35 PM6:51 AM6:51 AM6:20 AM6:20 AM6:17 PM6:17 PM6:05 PM6:05 PM6:26 AM6:26 AMNowNow
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.

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 Lan Yu is decreasing during the winter, falling from 63% to 55% over the course of the season.

The lowest chance of a muggy day during the winter is 37% on January 24.

For reference, on June 13, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 24, the least muggy day of the year, there are muggy conditions 37% of the time.

Humidity Comfort Levels in the Winter at Lan Yu

Humidity Comfort Levels in the Winter at Lan YuDecJanFeb0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%FallSpringJan 2437%Jan 2437%Dec 163%Dec 163%Feb 2855%Feb 2855%Jan 140%Jan 140%NowNowmiserablemiserableoppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydry
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 Lan Yu is very rapidly decreasing during the winter, decreasing from 21.0 miles per hour to 16.1 miles per hour over the course of the season.

For reference, on December 1, the windiest day of the year, the daily average wind speed is 21.0 miles per hour, while on May 10, the calmest day of the year, the daily average wind speed is 12.8 miles per hour.

The highest daily average wind speed during the winter is 21.0 miles per hour on December 1.

Average Wind Speed in the Winter at Lan Yu

Average Wind Speed in the Winter at Lan YuDecJanFeb0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mph30 mph30 mphFallSpringDec 121.0 mphDec 121.0 mphFeb 2816.1 mphFeb 2816.1 mphJan 119.0 mphJan 119.0 mphFeb 117.6 mphFeb 117.6 mphNowNow
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 Lan Yu throughout the winter is predominantly from the east, with a peak proportion of 70% on December 18.

Wind Direction in the Winter at Lan Yu

Wind Direction in the Winter at Lan YuDecJanFeb0%100%20%80%40%60%60%40%80%20%100%0%FallSpringNowNoweastsouthwest
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).

Lan Yu 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 Lan Yu is gradually decreasing during the winter, falling by 2°F, from 78°F to 76°F, over the course of the season.

The lowest average surface water temperature during the winter is 76°F on January 31.

Average Water Temperature in the Winter at Lan Yu

Average Water Temperature in the Winter at Lan YuDecJanFeb73°F73°F74°F74°F75°F75°F76°F76°F77°F77°F78°F78°F79°F79°F80°F80°F81°F81°F82°F82°F83°F83°FFallSpringJan 3176°FJan 3176°FDec 178°FDec 178°FFeb 2876°FFeb 2876°FJan 176°FJan 176°FNowNow
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).

Temperatures at Lan Yu are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in the Winter at Lan Yu

Time Spent in Various Temperature Bands and the Growing Season in the Winter at Lan YuDecJanFeb0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpring100%Jan 15100%Jan 15NowNowcoolcomfortablewarm
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 Lan Yu are very rapidly decreasing during the winter, decreasing by 7,105°F, from 8,042°F to 938°F, over the course of the season.

Growing Degree Days in the Winter at Lan Yu

Growing Degree Days in the Winter at Lan YuDecJanFeb1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°F6,000°F6,000°F7,000°F7,000°F8,000°F8,000°FFallSpringDec 18,042°FDec 18,042°FFeb 28938°FFeb 28938°FNowNow
The average growing degree days accumulated over the course of the winter, 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 Lan Yu is increasing during the winter, rising by 1.2 kWh, from 3.9 kWh to 5.1 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 3.7 kWh on December 24.

Average Daily Incident Shortwave Solar Energy in the Winter at Lan Yu

Average Daily Incident Shortwave Solar Energy in the Winter at Lan YuDecJanFeb0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWhFallSpringDec 243.7 kWhDec 243.7 kWhDec 13.9 kWhDec 13.9 kWhFeb 285.1 kWhFeb 285.1 kWhFeb 14.2 kWhFeb 14.2 kWhNowNow
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 Lan Yu are 22.029 deg latitude, 121.534 deg longitude, and 39 ft elevation.

The topography within 2 miles of Lan Yu contains very significant variations in elevation, with a maximum elevation change of 1,722 feet and an average elevation above sea level of 303 feet. Within 10 miles also contains very significant variations in elevation (1,722 feet). Within 50 miles contains very significant variations in elevation (2,986 feet).

The area within 2 miles of Lan Yu is covered by water (95%), within 10 miles by water (100%), and within 50 miles by water (99%).

This report illustrates the typical weather at Lan Yu, 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

Lan Yu 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 Hengchun Airport, Chihhang Tw-Afb, Pingtung North Air Force Base, Pingtung South Air Force Base, Kaohsiung International Airport, Kangshan Tw-Afb, Tainan Airport, and Chiayi 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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