Average Weather in Treharris United Kingdom
In Treharris, 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 35°F to 66°F and is rarely below 26°F or above 75°F.
The warm season lasts for 3.1 months, from June 11 to September 14, with an average daily high temperature above 62°F. The hottest day of the year is July 25, with an average high of 66°F and low of 54°F.
The cool season lasts for 4.0 months, from November 21 to March 19, with an average daily high temperature below 48°F. The coldest day of the year is February 7, with an average low of 35°F and high of 43°F.
Average High and Low Temperature
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 Treharris, 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 Treharris begins around April 4 and lasts for 6.2 months, ending around October 11. On July 23, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 56% of the time, and overcast or mostly cloudy 44% of the time.
The cloudier part of the year begins around October 11 and lasts for 5.8 months, ending around April 4. On December 27, the cloudiest day of the year, the sky is overcast or mostly cloudy 70% of the time, and clear, mostly clear, or partly cloudy 30% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Treharris varies throughout the year.
The wetter season lasts 4.5 months, from September 22 to February 7, with a greater than 33% chance of a given day being a wet day. The chance of a wet day peaks at 42% on November 5.
The drier season lasts 7.5 months, from February 7 to September 22. The smallest chance of a wet day is 24% 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 42% on November 5.
Daily Chance of Precipitation
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. Treharris experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Treharris. The most rain falls during the 31 days centered around October 31, with an average total accumulation of 3.3 inches.
The least rain falls around April 20, with an average total accumulation of 1.7 inches.
Average Monthly Rainfall
The sliding 31-day liquid-equivalent quantity of snowfall in Treharris 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
The length of the day in Treharris varies extremely over the course of the year. In 2017, the shortest day is December 21, with 7 hours, 48 minutes of daylight; the longest day is June 21, with 16 hours, 40 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 4:54 AM on June 17, and the latest sunrise is 3 hours, 25 minutes later at 8:19 AM on December 30. The earliest sunset is at 4:03 PM on December 12, and the latest sunset is 5 hours, 32 minutes later at 9:35 PM on June 24.
Daylight saving time (DST) is observed in Treharris during 2017, starting in the spring on March 26, lasting 7.1 months, and ending in the fall on October 29.
Sunrise & Sunset with Twilight and Daylight Saving Time
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 Treharris, 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
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 Treharris 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 27, with average wind speeds of more than 12.4 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 27 to October 12. The calmest day of the year is August 3, with an average hourly wind speed of 10.2 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Treharris is from the west throughout the year.
Treharris 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 3.2 months, from June 30 to October 4, with an average temperature above 60°F. The day of the year with the warmest water is August 13, with an average temperature of 64°F.
The time of year with cooler water lasts for 4.0 months, from December 19 to April 19, with an average temperature below 49°F. The day of the year with the coolest water is February 24, with an average temperature of 45°F.
Average Water Temperature
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 5.2 kWh. The brightest day of the year is June 28, with an average of 6.4 kWh.
The darker period of the year lasts for 3.9 months, from October 25 to February 20, with an average daily incident shortwave energy per square meter below 1.8 kWh. The darkest day of the year is December 26, with an average of 0.6 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Treharris are 51.665 deg latitude, -3.307 deg longitude, and 709 ft elevation.
The topography within 2 miles of Treharris contains very significant variations in elevation, with a maximum elevation change of 942 feet and an average elevation above sea level of 654 feet. Within 10 miles also contains very significant variations in elevation (1,781 feet). Within 50 miles contains very significant variations in elevation (2,940 feet).
The area within 2 miles of Treharris is covered by grassland (52%), artificial surfaces (23%), and trees (21%), within 10 miles by grassland (50%) and artificial surfaces (21%), and within 50 miles by grassland (45%) and cropland (19%).
This report illustrates the typical weather in Treharris, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Treharris.
For each station, the records are corrected for the elevation difference between that station and Treharris 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 Treharris is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Treharris and a given station.
The stations contributing to this reconstruction are: Cardiff Airport (35%, 30 kilometers, south); St Athan Royal Air Force Base (33%, 30 kilometers, south); Bristol Airport (18%, 51 kilometers, southeast); Pembrey Sands (10%, 73 kilometers, west); and RAF Shawbury (4.3%, 133 kilometers, north).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.