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.
Based on the tourism score, the best time of year to visit Treharris for warm-weather activities is from early July to late August.
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
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 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 2018, 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 13, and the latest sunset is 5 hours, 32 minutes later at 9:35 PM on June 25.
Daylight saving time (DST) is observed in Treharris during 2018, starting in the spring on March 25, lasting 7.1 months, and ending in the fall on October 28.
Sunrise & Sunset with Twilight and Daylight Saving Time
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
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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
Best Time of Year to Visit
To characterize how pleasant the weather is in Treharris 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 Treharris for general outdoor tourist activities is from early July to late August, with a peak score in the last week of July.
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 Treharris for hot-weather activities is from mid July to early August, with a peak score in the last week of July.
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.
The growing season in Treharris typically lasts for 6.8 months (208 days), from around April 13 to around November 7, rarely starting before March 19 or after May 4, and rarely ending before October 15 or after November 30.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Treharris should appear around May 21, only rarely appearing before May 7 or after June 6.
Growing Degree Days
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).
Time zones for aiports and weather stations are provided by AskGeo.com .