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Spring Weather at Lan Yu Taiwan

Daily high temperatures increase by 9°F, from 72°F to 81°F, rarely falling below 65°F or exceeding 84°F.

Daily low temperatures increase by 10°F, from 65°F to 75°F, rarely falling below 60°F or exceeding 78°F.

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 Spring at Lan Yu

Average High and Low Temperature in the Spring at Lan YuMarAprMay55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°FWinterSummerMar 172°FMar 172°F65°F65°FMay 3181°FMay 3181°F75°F75°FApr 175°FApr 175°F69°F69°FMay 179°FMay 179°F72°F72°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 spring 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 Spring at Lan Yu

Average Hourly Temperature in the Spring at Lan YuMarAprMay12 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 AMWinterSummercomfortablewarmcool
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 spring at Lan Yu experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 37% to 84%. The lowest chance of overcast or mostly cloudy conditions is 37% on March 1.

The clearest day of the spring is March 1, with clear, mostly clear, or partly cloudy conditions 63% 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 Spring at Lan Yu

Cloud Cover Categories in the Spring at Lan YuMarAprMay0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%WinterSummerJun 614%Jun 614%Mar 163%Mar 163%Apr 157%Apr 157%May 139%May 139%clearmostly clearpartly 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 spring is very rapidly increasing, starting the season at 17% and ending it at 56%.

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 Spring at Lan Yu

Probability of Precipitation in the Spring at Lan YuMarAprMay0%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%50%50%55%55%60%60%WinterSummerMar 117%Mar 117%May 3156%May 3156%Apr 120%Apr 120%May 128%May 128%rain
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 spring at Lan Yu is very rapidly increasing, starting the season at 0.8 inches, when it rarely exceeds 1.8 inches or falls below 0.1 inches, and ending the season at 8.6 inches, when it rarely exceeds 13.9 inches or falls below 3.5 inches.

Average Monthly Rainfall in the Spring at Lan Yu

Average Monthly Rainfall in the Spring at Lan YuMarAprMay0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 in16 in16 inWinterSummerMar 10.8 inMar 10.8 inMay 318.6 inMay 318.6 inApr 11.2 inApr 11.2 inMay 13.1 inMay 13.1 in
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 spring at Lan Yu, the length of the day is rapidly increasing. From the start to the end of the season, the length of the day increases by 1 hour, 40 minutes, implying an average daily increase of 1 minute, 6 seconds, and weekly increase of 7 minutes, 42 seconds.

The shortest day of the spring is March 1, with 11 hours, 43 minutes of daylight and the longest day is May 31, with 13 hours, 23 minutes of daylight.

Hours of Daylight and Twilight in the Spring at Lan Yu

Hours of Daylight and Twilight in the Spring at Lan YuMarAprMay0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrWinterSummerMar 2012 hr, 6 minMar 2012 hr, 6 minnightnightdaydayMay 3113 hr, 23 minMay 3113 hr, 23 minMay 112 hr, 58 minMay 112 hr, 58 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 latest sunrise of the spring at Lan Yu is 6:14 AM on March 1 and the earliest sunrise is 1 hour, 5 minutes earlier at 5:10 AM on May 31.

The earliest sunset is 5:57 PM on March 1 and the latest sunset is 35 minutes later at 6:33 PM on May 31.

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 Spring at Lan Yu

Sunrise & Sunset with Twilight in the Spring at Lan YuMarAprMay12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMWinterSummer5:10 AM5:10 AMMay 316:33 PMMay 316:33 PM6:14 AM6:14 AMMar 15:57 PMMar 15:57 PM5:46 AM5:46 AMApr 16:09 PMApr 16:09 PM5:22 AM5:22 AMMay 16:20 PMMay 16:20 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the spring. 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 Spring at Lan Yu

Solar Elevation and Azimuth in the Spring at Lan YuMarAprMay12 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 AMWinterSummer001020203030405050607080001010203030404050606070
northeastsouthwest
Solar elevation and azimuth in the the spring 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 spring 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 Spring at Lan Yu

Moon Rise, Set & Phases in the Spring at Lan YuMarAprMay12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMWinterSummerFeb 107:00 AMFeb 107:00 AMFeb 248:31 PMFeb 248:31 PMMar 105:01 PMMar 105:01 PMMar 253:01 PMMar 253:01 PMApr 92:22 AMApr 92:22 AMApr 247:50 AMApr 247:50 AMMay 811:23 AMMay 811:23 AMMay 239:54 PMMay 239:54 PMJun 68:38 PMJun 68:38 PMJun 229:09 AMJun 229:09 AM6:44 AM6:44 AM6:12 PM6:12 PM5:45 PM5:45 PM6:46 AM6:46 AM5:59 AM5:59 AM6:00 PM6:00 PM6:09 PM6:09 PM6:17 AM6:17 AM5:47 AM5:47 AM6:50 PM6:50 PM5:44 PM5:44 PM5:22 AM5:22 AM5:01 AM5:01 AM6:39 PM6:39 PM6:21 PM6:21 PM5:18 AM5:18 AM4:27 AM4:27 AM6:10 PM6:10 PM4:55 AM4:55 AM
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 very rapidly increasing during the spring, rising from 57% to 100% over the course of the season.

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 Spring at Lan Yu

Humidity Comfort Levels in the Spring at Lan YuMarAprMay0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%WinterSummerMar 157%Mar 157%May 31100%May 31100%Apr 184%Apr 184%May 197%May 197%miserablemiserableoppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydry
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 rapidly decreasing during the spring, decreasing from 16.0 miles per hour to 13.7 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 lowest daily average wind speed during the spring is 12.8 miles per hour on May 10.

Average Wind Speed in the Spring at Lan Yu

Average Wind Speed in the Spring at Lan YuMarAprMay0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mphWinterSummerMay 1012.8 mphMay 1012.8 mphMar 116.0 mphMar 116.0 mphMay 3113.7 mphMay 3113.7 mphApr 114.7 mphApr 114.7 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction at Lan Yu during the spring is predominantly out of the east from March 1 to May 26 and the south from May 26 to May 31.

Wind Direction in the Spring at Lan Yu

Wind Direction in the Spring at Lan YuESMarAprMay0%100%20%80%40%60%60%40%80%20%100%0%WinterSummerwestsoutheast
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 increasing during the spring, rising by 6°F, from 76°F to 83°F, over the course of the season.

Average Water Temperature in the Spring at Lan Yu

Average Water Temperature in the Spring at Lan YuMarAprMay72°F72°F74°F74°F76°F76°F78°F78°F80°F80°F82°F82°F84°F84°F86°F86°FWinterSummerMar 176°FMar 176°FMay 3183°FMay 3183°FApr 178°FApr 178°FMay 181°FMay 181°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).

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 Spring at Lan Yu

Time Spent in Various Temperature Bands and the Growing Season in the Spring at Lan YuMarAprMay0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%WinterSummer100%Apr 16100%Apr 16coolcomfortablewarmhot
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 increasing during the spring, increasing by 2,094°F, from 973°F to 3,067°F, over the course of the season.

Growing Degree Days in the Spring at Lan Yu

Growing Degree Days in the Spring at Lan YuMarAprMay1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°FWinterSummerMar 1973°FMar 1973°FMay 313,067°FMay 313,067°FApr 11,577°FApr 11,577°FMay 12,275°FMay 12,275°F
The average growing degree days accumulated over the course of the spring, 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 essentially constant during the spring, remaining within 0.5 kWh of 5.6 kWh throughout.

The highest average daily incident shortwave solar energy during the spring is 6.1 kWh on April 14.

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

Average Daily Incident Shortwave Solar Energy in the Spring at Lan YuMarAprMay0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhWinterSummerApr 146.1 kWhApr 146.1 kWhMar 15.1 kWhMar 15.1 kWhMay 315.2 kWhMay 315.2 kWhMay 16.0 kWhMay 16.0 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 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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