Spring Weather in Yilan Taiwan

Daily high temperatures increase by 14°F, from 69°F to 83°F, rarely falling below 59°F or exceeding 88°F.

Daily low temperatures increase by 14°F, from 59°F to 73°F, rarely falling below 53°F or exceeding 76°F.

For reference, on July 11, the hottest day of the year, temperatures in Yilan typically range from 78°F to 90°F, while on January 23, the coldest day of the year, they range from 57°F to 66°F.

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.

Edgewater, United States (8,439 miles away) is the far-away foreign place with temperatures most similar to Yilan (view comparison).

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The spring in Yilan experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 47% to 78%. The lowest chance of overcast or mostly cloudy conditions is 44% on March 14.

The clearest day of the spring is March 14, with clear, mostly clear, or partly cloudy conditions 56% of the time.

For reference, on June 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 83%, while on October 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 59%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Yilan, the chance of a wet day over the course of the spring is very rapidly increasing, starting the season at 37% and ending it at 57%.

For reference, the year's highest daily chance of a wet day is 57% on May 31, and its lowest chance is 21% on December 15.

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 in Yilan is very rapidly increasing, starting the season at 4.2 inches, when it rarely exceeds 9.1 inches or falls below 1.1 inches, and ending the season at 8.7 inches, when it rarely exceeds 14.8 inches or falls below 3.9 inches.

Over the course of the spring in Yilan, 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, 54 minutes, implying an average daily increase of 1 minute, 15 seconds, and weekly increase of 8 minutes, 47 seconds.

The shortest day of the spring is March 1, with 11 hours, 40 minutes of daylight and the longest day is May 31, with 13 hours, 34 minutes of daylight.

The latest sunrise of the spring in Yilan is 6:15 AM on March 1 and the earliest sunrise is 1 hour, 12 minutes earlier at 5:03 AM on May 31.

The earliest sunset is 5:55 PM on March 1 and the latest sunset is 42 minutes later at 6:37 PM on May 31.

Daylight saving time is not observed in Yilan during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:04 AM and sets 13 hours, 41 minutes later, at 6:44 PM, while on December 21, the shortest day of the year, it rises at 6:33 AM and sets 10 hours, 36 minutes later, at 5:09 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 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.

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 Yilan is very rapidly increasing during the spring, rising from 23% to 97% over the course of the season.

For reference, on July 2, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 20, the least muggy day of the year, there are muggy conditions 8% 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 Yilan is rapidly decreasing during the spring, decreasing from 11.3 miles per hour to 7.6 miles per hour over the course of the season.

For reference, on December 4, the windiest day of the year, the daily average wind speed is 13.3 miles per hour, while on June 21, the calmest day of the year, the daily average wind speed is 6.8 miles per hour.

The wind direction in Yilan during the spring is predominantly out of the north from March 1 to March 15 and the east from March 15 to May 31.

Yilan 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 Yilan is rapidly increasing during the spring, rising by 9°F, from 71°F to 80°F, over the course of the season.

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 in Yilan 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.

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 Yilan are very rapidly increasing during the spring, increasing by 1,923°F, from 703°F to 2,626°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 Yilan is increasing during the spring, rising by 1.1 kWh, from 3.9 kWh to 5.1 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the spring is 5.3 kWh on April 30.

For the purposes of this report, the geographical coordinates of Yilan are 24.757 deg latitude, 121.753 deg longitude, and 49 ft elevation.

The topography within 2 miles of Yilan contains only modest variations in elevation, with a maximum elevation change of 105 feet and an average elevation above sea level of 33 feet. Within 10 miles contains only modest variations in elevation (4,701 feet). Within 50 miles also contains extreme variations in elevation (12,812 feet).

The area within 2 miles of Yilan is covered by cropland (75%), artificial surfaces (14%), and shrubs (11%), within 10 miles by water (54%) and trees (18%), and within 50 miles by water (69%) and trees (25%).