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Average Weather in Mullion United Kingdom

In Mullion, the summers are short, cool, and windy; the winters are long, cold, wet, and extremely windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 40°F to 66°F and is rarely below 32°F or above 71°F.

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

Climate Summary

coldcoolcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow54%54%34%34%overcastclearprecipitation: 3.6 inprecipitation: 3.6 in1.7 in1.7 inmuggy: 1%muggy: 1%0%0%drydrytourism score: 6.5tourism score: 6.50.20.2
Click on each chart for more information.

Temperature

The warm season lasts for 2.9 months, from June 20 to September 18, with an average daily high temperature above 62°F. The hottest day of the year is August 1, with an average high of 66°F and low of 57°F.

The cool season lasts for 4.3 months, from November 26 to April 4, with an average daily high temperature below 51°F. The coldest day of the year is February 21, with an average low of 40°F and high of 48°F.

Average High and Low Temperature

Average High and Low Temperature in MullionwarmcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FFeb 2148°FFeb 2148°FAug 166°FAug 166°F40°F40°F57°F57°FJun 2062°FJun 2062°FSep 1862°FSep 1862°FNov 2651°FNov 2651°FApr 451°FApr 451°F53°F53°F53°F53°F44°F44°F42°F42°FNowNow
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 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

Average Hourly Temperature in MullionJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowvery coldvery coldcoldcoldcool
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.

Ocean Shores, Washington, United States (4,815 miles away) is the far-away foreign place with temperatures most similar to Mullion (view comparison).

Clouds

In Mullion, 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 Mullion begins around March 28 and lasts for 6.5 months, ending around October 12. 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 12 and lasts for 5.5 months, ending around March 28. On December 26, the cloudiest day of the year, the sky is overcast or mostly cloudy 66% of the time, and clear, mostly clear, or partly cloudy 34% of the time.

Cloud Cover Categories

Cloud Cover Categories in MullionclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 2454%Jul 2454%Dec 2634%Dec 2634%Mar 2843%Mar 2843%Oct 1244%Oct 1244%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.

Precipitation

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

The wetter season lasts 4.8 months, from October 2 to February 24, with a greater than 33% chance of a given day being a wet day. The chance of a wet day peaks at 45% on January 6.

The drier season lasts 7.3 months, from February 24 to October 2. The smallest chance of a wet day is 22% on July 24.

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 44% on January 6.

Daily Chance of Precipitation

Daily Chance of Precipitation in MullionwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 645%Jan 645%Jul 2422%Jul 2422%Jan 144%Jan 144%Oct 233%Oct 233%Feb 2433%Feb 2433%NowNowrain
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 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. Mullion experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Mullion. The most rain falls during the 31 days centered around December 31, with an average total accumulation of 3.6 inches.

The least rain falls around May 5, with an average total accumulation of 1.7 inches.

Average Monthly Rainfall

Average Monthly Rainfall in MullionJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 in7 in7 inDec 313.6 inDec 313.6 inMay 51.7 inMay 51.7 inJun 211.8 inJun 211.8 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 liquid-equivalent snowfall.

Sun

The length of the day in Mullion varies extremely over the course of the year. In 2021, the shortest day is December 21, with 8 hours, 4 minutes of daylight; the longest day is June 21, with 16 hours, 23 minutes of daylight.

Hours of Daylight and Twilight

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 is at 5:10 AM on June 17, and the latest sunrise is 3 hours, 9 minutes later at 8:19 AM on December 31. The earliest sunset is at 4:18 PM on December 11, and the latest sunset is 5 hours, 16 minutes later at 9:34 PM on June 25.

Daylight saving time (DST) is observed in Mullion 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

Sunrise & Sunset with Twilight and Daylight Saving Time in MullionJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 175:10 AMJun 175:10 AM9:34 PMJun 259:34 PMJun 25Dec 114:18 PMDec 114:18 PM8:19 AMDec 318:19 AMDec 31Mar 28DSTMar 28DSTDSTOct 31DSTOct 31daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunsetNowNow
The solar day over the course of the year 2021. 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 transitions to and from daylight saving time are indicated by the 'DST' labels.

Moon

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

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.

Humidity

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 Mullion, 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

Humidity Comfort Levels in MullionJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Nov 210%Nov 210%Aug 151%Aug 151%NowNowcomfortablecomfortabledrydryhumidhumid
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.

Wind

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

The windier part of the year lasts for 5.5 months, from October 13 to March 27, with average wind speeds of more than 17.0 miles per hour. The windiest day of the year is January 1, with an average hourly wind speed of 20.9 miles per hour.

The calmer time of year lasts for 6.5 months, from March 27 to October 13. The calmest day of the year is August 3, with an average hourly wind speed of 13.2 miles per hour.

Average Wind Speed

Average Wind Speed in MullionwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mph30 mph30 mphJan 120.9 mphJan 120.9 mphAug 313.2 mphAug 313.2 mphOct 1317.0 mphOct 1317.0 mphMar 2717.0 mphMar 2717.0 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

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

The wind is most often from the north for 1.3 weeks, from April 17 to April 26, with a peak percentage of 27% on April 22. The wind is most often from the east for 5.0 days, from April 26 to May 1, with a peak percentage of 26% on April 28. The wind is most often from the west for 12 months, from May 1 to April 17, with a peak percentage of 40% on January 1.

Wind Direction

Wind Direction in MullionWWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsoutheastnorth
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).

Water Temperature

Mullion 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 2.6 months, from July 3 to September 23, with an average temperature above 60°F. The day of the year with the warmest water is August 6, with an average temperature of 62°F.

The time of year with cooler water lasts for 4.1 months, from December 31 to May 3, with an average temperature below 52°F. The day of the year with the coolest water is March 8, with an average temperature of 49°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is in Mullion 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 Mullion for general outdoor tourist activities is from early July to early September, with a peak score in the last week of July.

Tourism Score

Tourism Score in Mullionbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.56.50.20.2NowNowprecipitationprecipitationcloudscloudstemperaturetemperature tourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Mullion for hot-weather activities is from mid July to early August, with a peak score in the last week of July.

Beach/Pool Score

Beach/Pool Score in MullionJanFebMarAprMayJunJulAugSepOctNovDec002244668810101.01.00.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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.

Growing Season

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 Mullion typically lasts for 9.9 months (299 days), from around February 27 to around December 23, rarely starting before January 20 or after April 5, and rarely ending before November 21 or after January 15.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season in Mulliongrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Feb 2750%Feb 2750%Dec 2350%Dec 2390%Apr 590%Apr 590%Nov 2190%Nov 2110%Jan 2010%Jan 20Aug 5100%Aug 5100%NowNowvery coldcoldcoolcomfortable
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.

Based on growing degree days alone, the first spring blooms in Mullion should appear around May 14, only rarely appearing before April 29 or after May 30.

Growing Degree Days

Growing Degree Days in MullionJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F200°F200°F400°F400°F600°F600°F800°F800°F1,000°F1,000°F1,200°F1,200°F1,400°F1,400°F1,600°F1,600°FMay 1490°FMay 1490°FAug 18900°FAug 18900°FDec 311,515°FDec 311,515°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 5.5 kWh. The brightest day of the year is June 27, with an average of 6.7 kWh.

The darker period of the year lasts for 3.8 months, from October 26 to February 19, with an average daily incident shortwave energy per square meter below 1.9 kWh. The darkest day of the year is December 25, with an average of 0.7 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in MullionbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 276.7 kWhJun 276.7 kWhDec 250.7 kWhDec 250.7 kWhMay 35.5 kWhMay 35.5 kWhAug 155.5 kWhAug 155.5 kWhOct 261.9 kWhOct 261.9 kWhFeb 191.9 kWhFeb 191.9 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.

Topography

For the purposes of this report, the geographical coordinates of Mullion are 50.027 deg latitude, -5.242 deg longitude, and 226 ft elevation.

The topography within 2 miles of Mullion contains only modest variations in elevation, with a maximum elevation change of 305 feet and an average elevation above sea level of 166 feet. Within 10 miles contains only modest variations in elevation (725 feet). Within 50 miles contains significant variations in elevation (1,342 feet).

The area within 2 miles of Mullion is covered by cropland (43%), water (19%), grassland (18%), and shrubs (10%), within 10 miles by water (61%) and cropland (23%), and within 50 miles by water (86%).

Data Sources

This report illustrates the typical weather in Mullion, 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 is only a single weather station, Culdrose, in our network suitable to be used as a proxy for the historical temperature and dew point records of Mullion.

At a distance of 7 kilometers from Mullion, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and Mullion according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

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 © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.