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December Weather at RCGM Taiwan

Daily high temperatures decrease by 5°F, from 71°F to 66°F, rarely falling below 57°F or exceeding 79°F.

Daily low temperatures decrease by 5°F, from 62°F to 57°F, rarely falling below 50°F or exceeding 68°F.

For reference, on July 17, the hottest day of the year, temperatures at RCGM typically range from 80°F to 91°F, while on January 27, the coldest day of the year, they range from 55°F to 63°F.

Average High and Low Temperature in December at RCGM

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 RCGM

Average Hourly Temperature in December at RCGMDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMNovJanNowNowcoolcomfortablewarm
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.

Port Aransas, Texas, United States (7,990 miles away); Grand Isle, Louisiana, United States (8,159 miles); and Edgewater, Florida, United States (8,432 miles) are the far-away foreign places with temperatures most similar to RCGM (view comparison).

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The month of December at RCGM experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 42% throughout the month.

The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 59% of the time.

For reference, on June 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 82%, while on October 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 63%.

Cloud Cover Categories in December at RCGM

Cloud Cover Categories in December at RCGMDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanDec 159%Dec 159%Dec 3156%Dec 3156%Dec 1158%Dec 1158%Dec 2157%Dec 2157%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 RCGM, the chance of a wet day over the course of December is gradually decreasing, starting the month at 27% and ending it at 25%.

For reference, the year's highest daily chance of a wet day is 59% on June 10, and its lowest chance is 21% on December 16.

Probability of Precipitation in December at RCGM

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 RCGM is decreasing, starting the month at 2.8 inches, when it rarely exceeds 5.4 inches or falls below 0.5 inches, and ending the month at 2.3 inches, when it rarely exceeds 4.4 inches or falls below 0.5 inches.

The lowest average 31-day accumulation is 2.2 inches on December 27.

Average Monthly Rainfall in December at RCGM

Average Monthly Rainfall in December at RCGMDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 in7 in7 in8 in8 inNovJanDec 272.2 inDec 272.2 inDec 12.8 inDec 12.8 inDec 112.5 inDec 112.5 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 December at RCGM, the length of the day is essentially constant. The shortest day of the month is December 22, with 10 hours, 35 minutes of daylight and the longest day is December 1, with 10 hours, 42 minutes of daylight.

Hours of Daylight and Twilight in December at RCGM

Hours of Daylight and Twilight in December at RCGMDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 2110 hr, 35 minDec 2110 hr, 35 minnightnightdaydayDec 110 hr, 42 minDec 110 hr, 42 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 RCGM is 6:23 AM on December 1 and the latest sunrise is 17 minutes later at 6:39 AM on December 31.

The earliest sunset is 5:04 PM on December 1 and the latest sunset is 11 minutes later at 5:16 PM on December 31.

Daylight saving time is not observed at RCGM during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:05 AM and sets 13 hours, 42 minutes later, at 6:47 PM, while on December 21, the shortest day of the year, it rises at 6:35 AM and sets 10 hours, 35 minutes later, at 5:10 PM.

Sunrise & Sunset with Twilight in December at RCGM

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 RCGM

Solar Elevation and Azimuth in December at RCGMDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMNovJan00101020202030304040000101020203030304040NowNow
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 RCGM

Moon Rise, Set & Phases in December at RCGMDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanNov 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 PM5:35 AM5:35 AM4:55 PM4:55 PM4:26 PM4:26 PM6:22 AM6:22 AM6:15 AM6:15 AM4:52 PM4:52 PM4:50 PM4:50 PM7:24 AM7:24 AM6:58 AM6:58 AM5:29 PM5:29 PM4:39 PM4:39 PM7:00 AM7:00 AM6:29 AM6:29 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%6:15 AMESE4:52 PMWSW-11:33 AMS246,461 mi
2
1%7:14 AMESE5:42 PMWSW-12:28 PMS244,432 mi
3
4%8:11 AMESE6:38 PMWSW-1:25 PMS242,320 mi
4
9%9:05 AMESE7:39 PMWSW-2:22 PMS240,178 mi
5
17%9:54 AMESE8:41 PMWSW-3:18 PMS238,032 mi
6
26%10:38 AMESE9:44 PMWSW-4:11 PMS235,900 mi
7
36%11:18 AMESE10:45 PMWSW-5:02 PMS233,805 mi
8
50%11:53 AME11:46 PMW-5:49 PMS231,798 mi
9
59%12:28 PME--6:36 PMS229,969 mi
10
71%-12:47 AMW1:02 PME7:24 PMS228,453 mi
11
81%-1:49 AMW1:38 PMENE8:13 PMS227,414 mi
12
89%-2:53 AMWNW2:17 PMENE9:06 PMS227,026 mi
13
96%-4:00 AMWNW3:01 PMENE10:02 PMS227,434 mi
14
99%-5:10 AMWNW3:52 PMENE11:04 PMN228,711 mi
15
100%-6:19 AMWNW4:50 PMENE--
16
100%-7:24 AMWNW5:53 PMENE12:07 AMN230,830 mi
17
98%-8:22 AMWNW6:58 PMENE1:09 AMN233,648 mi
18
93%-9:11 AMWNW8:01 PMENE2:07 AMN236,927 mi
19
87%-9:53 AMWNW9:00 PMENE3:00 AMS240,377 mi
20
79%-10:29 AMWNW9:56 PMENE3:47 AMS243,703 mi
21
70%-11:01 AMW10:49 PME4:31 AMS246,639 mi
22
60%-11:30 AMW11:40 PME5:11 AMS248,970 mi
23
50%-11:58 AMW-5:50 AMS250,544 mi
24
41%12:30 AME12:26 PMW-6:29 AMS251,280 mi
25
31%1:21 AMESE12:55 PMWSW-7:08 AMS251,167 mi
26
23%2:13 AMESE1:27 PMWSW-7:50 AMS250,259 mi
27
15%3:07 AMESE2:03 PMWSW-8:35 AMS248,671 mi
28
8%4:04 AMESE2:45 PMWSW-9:24 AMS246,560 mi
29
4%5:03 AMESE3:33 PMWSW-10:18 AMS244,118 mi
30
1%6:02 AMESE4:28 PMWSW-11:15 AMS241,547 mi
31
0%6:58 AMESE5:29 PMWSW-12:13 PMS239,038 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 RCGM is rapidly decreasing during December, falling from 17% to 3% over the course of the month.

For reference, on July 9, 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 1% of the time.

Humidity Comfort Levels in December at RCGM

Humidity Comfort Levels in December at RCGMDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%NovJanDec 117%Dec 117%Dec 313%Dec 313%Dec 1110%Dec 1110%Dec 215%Dec 215%muggymuggyhumidhumidcomfortablecomfortabledrydryoppressiveoppressive
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 RCGM is gradually decreasing during December, decreasing from 15.0 miles per hour to 14.1 miles per hour over the course of the month.

For reference, on October 19, the windiest day of the year, the daily average wind speed is 15.0 miles per hour, while on July 10, the calmest day of the year, the daily average wind speed is 8.0 miles per hour.

Average Wind Speed in December at RCGM

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 RCGM throughout December is predominantly from the east, with a peak proportion of 62% on December 1.

Wind Direction in December at RCGM

Wind Direction in December at RCGMDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%NovJanNowNoweastnorthwest
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).

RCGM 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 RCGM is decreasing during December, falling by 4°F, from 71°F to 67°F, over the course of the month.

Average Water Temperature in December at RCGM

Average Water Temperature in December at RCGMDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313160°F60°F62°F62°F64°F64°F66°F66°F68°F68°F70°F70°F72°F72°F74°F74°F76°F76°F78°F78°F80°F80°FNovJanDec 171°FDec 171°FDec 3167°FDec 3167°FDec 1169°FDec 1169°FDec 2168°FDec 2168°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 RCGM 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 December at RCGM

Time Spent in Various Temperature Bands and the Growing Season in December at RCGMDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJan100%Dec 16100%Dec 16NowNowcoldcoolcomfortablewarm
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 RCGM are increasing during December, increasing by 403°F, from 7,711°F to 8,114°F, over the course of the month.

Growing Degree Days in December at RCGM

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 RCGM is essentially constant during December, remaining within 0.1 kWh of 2.9 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 2.8 kWh on December 25.

Average Daily Incident Shortwave Solar Energy in December at RCGM

Average Daily Incident Shortwave Solar Energy in December at RCGMDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 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 kWh5.0 kWh5.0 kWh5.5 kWh5.5 kWhNovJanDec 252.8 kWhDec 252.8 kWhDec 13.1 kWhDec 13.1 kWhDec 112.9 kWhDec 112.9 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 RCGM are 25.079 deg latitude, 121.235 deg longitude, and 79 ft elevation.

The topography within 2 miles of RCGM contains only modest variations in elevation, with a maximum elevation change of 249 feet and an average elevation above sea level of 85 feet. Within 10 miles contains only modest variations in elevation (1,056 feet). Within 50 miles contains very significant variations in elevation (12,812 feet).

The area within 2 miles of RCGM is covered by artificial surfaces (55%), sparse vegetation (14%), and bare soil (14%), within 10 miles by water (58%) and artificial surfaces (22%), and within 50 miles by water (73%) and trees (21%).

This report illustrates the typical weather at RCGM, 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

RCGM 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 Taiwan Taoyuan International Airport, Taipei Songshan Airport, Hsinchu Tw-Afb, Taichung Airport, Taichung Tw-Afb, and Hualien 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.

Please review our full terms contained on our Terms of Service page.