Climate and Average Weather Year Round in Llanrwst United Kingdom

In Llanrwst, 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 65°F and is rarely below 26°F or above 73°F.

Based on the tourism score, the best time of year to visit Llanrwst for warm-weather activities is from early July to late August.

The warm season lasts for 3.1 months, from June 10 to September 15, with an average daily high temperature above 60°F. The hottest month of the year in Llanrwst is July, with an average high of 64°F and low of 52°F.

The cool season lasts for 4.0 months, from November 20 to March 20, with an average daily high temperature below 47°F. The coldest month of the year in Llanrwst is February, with an average low of 35°F and high of 44°F.

In Llanrwst, 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 Llanrwst begins around April 17 and lasts for 5.7 months, ending around October 6.

The clearest month of the year in Llanrwst is July, during which on average the sky is clear, mostly clear, or partly cloudy 51% of the time.

The cloudier part of the year begins around October 6 and lasts for 6.3 months, ending around April 17.

The cloudiest month of the year in Llanrwst is December, during which on average the sky is overcast or mostly cloudy 71% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Llanrwst varies throughout the year.

The wetter season lasts 4.4 months, from September 21 to February 4, with a greater than 40% chance of a given day being a wet day. The month with the most wet days in Llanrwst is December, with an average of 15.0 days with at least 0.04 inches of precipitation.

The drier season lasts 7.5 months, from February 4 to September 21. The month with the fewest wet days in Llanrwst is April, with an average of 9.2 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Llanrwst is November, with an average of 14.4 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 50% on November 2.

Rainfall

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. Llanrwst experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Llanrwst. The month with the most rain in Llanrwst is November, with an average rainfall of 3.9 inches.

The month with the least rain in Llanrwst is April, with an average rainfall of 2.0 inches.

The length of the day in Llanrwst varies extremely over the course of the year. In 2024, the shortest day is December 21, with 7 hours, 32 minutes of daylight; the longest day is June 20, with 16 hours, 58 minutes of daylight.

The earliest sunrise is at 4:47 AM on June 17, and the latest sunrise is 3 hours, 42 minutes later at 8:29 AM on December 29. The earliest sunset is at 3:57 PM on December 13, and the latest sunset is 5 hours, 49 minutes later at 9:46 PM on June 24.

Daylight saving time (DST) is observed in Llanrwst during 2024, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 27.

The figure below presents a compact representation of key lunar data for 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.

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 Llanrwst, 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.

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 Llanrwst experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.4 months, from October 11 to March 23, with average wind speeds of more than 11.0 miles per hour. The windiest month of the year in Llanrwst is January, with an average hourly wind speed of 13.3 miles per hour.

The calmer time of year lasts for 6.6 months, from March 23 to October 11. The calmest month of the year in Llanrwst is June, with an average hourly wind speed of 8.5 miles per hour.

The predominant average hourly wind direction in Llanrwst varies throughout the year.

The wind is most often from the south for 2.1 weeks, from April 23 to May 8 and for 2.0 weeks, from October 3 to October 17, with a peak percentage of 36% on October 11. The wind is most often from the west for 4.8 months, from May 8 to October 3 and for 6.2 months, from October 17 to April 23, with a peak percentage of 44% on July 2.

Llanrwst 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 6, with an average temperature above 58°F. The month of the year in Llanrwst with the warmest water is August, with an average temperature of 61°F.

The time of year with cooler water lasts for 3.7 months, from December 26 to April 16, with an average temperature below 47°F. The month of the year in Llanrwst with the coolest water is February, with an average temperature of 44°F.

To characterize how pleasant the weather is in Llanrwst 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 Llanrwst 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 Llanrwst for hot-weather activities is from early July to early August, with a peak score in the third week of July.

Methodology

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 Llanrwst typically lasts for 6.8 months (209 days), from around April 15 to around November 9, rarely starting before March 23 or after May 9, and rarely ending before October 12 or after December 10.

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 Llanrwst should appear around May 23, only rarely appearing before May 8 or after June 9.

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 1 to August 12, with an average daily incident shortwave energy per square meter above 5.0 kWh. The brightest month of the year in Llanrwst is June, with an average of 6.0 kWh.

The darker period of the year lasts for 4.0 months, from October 22 to February 22, with an average daily incident shortwave energy per square meter below 1.6 kWh. The darkest month of the year in Llanrwst is December, with an average of 0.5 kWh.

For the purposes of this report, the geographical coordinates of Llanrwst are 53.140 deg latitude, -3.795 deg longitude, and 56 ft elevation.

The topography within 2 miles of Llanrwst contains very significant variations in elevation, with a maximum elevation change of 1,079 feet and an average elevation above sea level of 406 feet. Within 10 miles contains very significant variations in elevation (3,471 feet). Within 50 miles also contains extreme variations in elevation (3,494 feet).

The area within 2 miles of Llanrwst is covered by grassland (74%) and trees (20%), within 10 miles by grassland (60%) and shrubs (14%), and within 50 miles by water (47%) and grassland (31%).