Climate and Average Weather Year Round in Llanddeusant United Kingdom
In Llanddeusant, the summers are cool and partly cloudy and the winters are long, very cold, wet, windy, and mostly cloudy. Over the course of the year, the temperature typically varies from 33°F to 65°F and is rarely below 23°F or above 73°F.
Based on the tourism score, the best time of year to visit Llanddeusant for warm-weather activities is from early July to late August.
Climate in Llanddeusant
Average Temperature in Llanddeusant
The warm season lasts for 3.2 months, from June 10 to September 16, with an average daily high temperature above 60°F. The hottest day of the year is July 27, with an average high of 65°F and low of 52°F.
The cool season lasts for 3.9 months, from November 20 to March 17, with an average daily high temperature below 46°F. The coldest day of the year is February 7, with an average low of 33°F and high of 42°F.
Average High and Low Temperature in Llanddeusant
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, 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 Llanddeusant
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
In Llanddeusant, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Llanddeusant begins around April 11 and lasts for 5.9 months, ending around October 8. On July 24, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 54% of the time, and overcast or mostly cloudy 46% of the time.
The cloudier part of the year begins around October 8 and lasts for 6.1 months, ending around April 11. On December 25, the cloudiest day of the year, the sky is overcast or mostly cloudy 73% of the time, and clear, mostly clear, or partly cloudy 27% of the time.
Cloud Cover Categories in Llanddeusant
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. The chance of wet days in Llanddeusant varies throughout the year.
The wetter season lasts 4.9 months, from September 20 to February 16, with a greater than 36% chance of a given day being a wet day. The chance of a wet day peaks at 47% on January 6.
The drier season lasts 7.1 months, from February 16 to September 20. The smallest chance of a wet day is 26% on April 23.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 46% on November 3.
Daily Chance of Precipitation in Llanddeusant
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Llanddeusant experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Llanddeusant. The most rain falls during the 31 days centered around October 31, with an average total accumulation of 4.1 inches.
The least rain falls around April 24, with an average total accumulation of 2.0 inches.
Average Monthly Rainfall in Llanddeusant
The sliding 31-day liquid-equivalent quantity of snowfall in Llanddeusant does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.
Average Liquid-Equivalent Monthly Snowfall in Llanddeusant
The length of the day in Llanddeusant varies extremely over the course of the year. In 2021, the shortest day is December 21, with 7 hours, 46 minutes of daylight; the longest day is June 21, with 16 hours, 43 minutes of daylight.
Hours of Daylight and Twilight in Llanddeusant
The earliest sunrise is at 4:55 AM on June 17, and the latest sunrise is 3 hours, 28 minutes later at 8:22 AM on December 30. The earliest sunset is at 4:03 PM on December 12, and the latest sunset is 5 hours, 35 minutes later at 9:38 PM on June 24.
Daylight saving time (DST) is observed in Llanddeusant during 2021, starting in the spring on March 28, lasting 7.1 months, and ending in the fall on October 31.
Sunrise & Sunset with Twilight and Daylight Saving Time in Llanddeusant
The figure below presents a compact representation of key lunar data for 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.
Moon Rise, Set & Phases in Llanddeusant
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 perceived humidity level in Llanddeusant, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels in Llanddeusant
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 Llanddeusant experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 5.5 months, from October 12 to March 28, with average wind speeds of more than 12.3 miles per hour. The windiest day of the year is January 3, with an average hourly wind speed of 14.6 miles per hour.
The calmer time of year lasts for 6.5 months, from March 28 to October 12. The calmest day of the year is August 3, with an average hourly wind speed of 10.0 miles per hour.
Average Wind Speed in Llanddeusant
The predominant average hourly wind direction in Llanddeusant varies throughout the year.
The wind is most often from the east for 1.6 weeks, from April 27 to May 8, with a peak percentage of 28% on May 5. The wind is most often from the west for 12 months, from May 8 to April 27, with a peak percentage of 40% on January 1.
Wind Direction in Llanddeusant
Llanddeusant 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 water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 3.3 months, from June 28 to October 5, with an average temperature above 59°F. The day of the year with the warmest water is August 13, with an average temperature of 63°F.
The time of year with cooler water lasts for 3.9 months, from December 21 to April 16, with an average temperature below 48°F. The day of the year with the coolest water is February 23, with an average temperature of 44°F.
Average Water Temperature in Llanddeusant
Best Time of Year to Visit
To characterize how pleasant the weather is in Llanddeusant throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Llanddeusant for general outdoor tourist activities is from early July to late August, with a peak score in the last week of July.
Tourism Score in Llanddeusant
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Llanddeusant for hot-weather activities is from early July to early August, with a peak score in the last week of July.
Beach/Pool Score in Llanddeusant
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
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 Llanddeusant typically lasts for 6.0 months (182 days), from around April 27 to around October 26, rarely starting before April 7 or after May 20, and rarely ending before October 3 or after November 17.
Time Spent in Various Temperature Bands and the Growing Season in Llanddeusant
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.
Based on growing degree days alone, the first spring blooms in Llanddeusant should appear around May 25, only rarely appearing before May 9 or after June 11.
Growing Degree Days in Llanddeusant
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 experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.4 months, from May 3 to August 15, with an average daily incident shortwave energy per square meter above 5.1 kWh. The brightest day of the year is June 28, with an average of 6.3 kWh.
The darker period of the year lasts for 3.9 months, from October 24 to February 21, with an average daily incident shortwave energy per square meter below 1.7 kWh. The darkest day of the year is December 26, with an average of 0.5 kWh.
Average Daily Incident Shortwave Solar Energy in Llanddeusant
For the purposes of this report, the geographical coordinates of Llanddeusant are 51.900 deg latitude, -3.783 deg longitude, and 630 ft elevation.
The topography within 2 miles of Llanddeusant contains very significant variations in elevation, with a maximum elevation change of 1,650 feet and an average elevation above sea level of 1,007 feet. Within 10 miles contains very significant variations in elevation (2,536 feet). Within 50 miles also contains large variations in elevation (2,927 feet).
The area within 2 miles of Llanddeusant is covered by grassland (100%), within 10 miles by grassland (84%), and within 50 miles by grassland (47%) and water (29%).
This report illustrates the typical weather in Llanddeusant, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Llanddeusant.
For each station, the records are corrected for the elevation difference between that station and Llanddeusant 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 Llanddeusant is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Llanddeusant and a given station.
The stations contributing to this reconstruction are: Pembrey Sands (EGOP, 37%, 45 kilometers, southwest); Aberporth (EGUC, 27%, 60 kilometers, northwest); St Athan Royal Air Force Base (EGDX, 26%, 60 kilometers, southeast); and RAF Shawbury (EGOS, 9%, 125 kilometers, northeast).
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.