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Average Weather at Barra Airport United Kingdom

At Barra Airport, the summers are short, cool, and windy; the winters are long, very cold, wet, and extremely windy; and it is mostly cloudy year round. Over the course of the year, the temperature typically varies from 39°F to 62°F and is rarely below 32°F or above 66°F.

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

Climate Summary

coldcoolcoldJanFebMarAprMayJunJulAugSepOctNovDec44%44%27%27%overcastclearprecipitation: 4.8 inprecipitation: 4.8 in2.0 in2.0 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 4.7tourism score: 4.70.00.0
Click on each chart for more information.

Temperature

The warm season lasts for 2.7 months, from June 24 to September 15, with an average daily high temperature above 59°F. The hottest day of the year is August 4, with an average high of 62°F and low of 54°F.

The cool season lasts for 4.1 months, from November 30 to April 4, with an average daily high temperature below 49°F. The coldest day of the year is February 17, with an average low of 39°F and high of 46°F.

Average High and Low Temperature

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 at Barra AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMvery coldcoldcoldcoolvery cold
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.

Metchosin, Canada (4,294 miles away) is the far-away foreign place with temperatures most similar to Barra Airport (view comparison).

Clouds

At Barra Airport, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year at Barra Airport begins around April 6 and lasts for 6.5 months, ending around October 21. On May 24, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 44% of the time, and overcast or mostly cloudy 56% of the time.

The cloudier part of the year begins around October 21 and lasts for 5.5 months, ending around April 6. On January 27, 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

Cloud Cover Categories at Barra AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 2444%May 2444%Jan 2727%Jan 2727%Apr 635%Apr 635%Oct 2136%Oct 2136%clearmostly 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 at Barra Airport varies significantly throughout the year.

The wetter season lasts 6.2 months, from September 15 to March 22, with a greater than 43% chance of a given day being a wet day. The chance of a wet day peaks at 59% on January 3.

The drier season lasts 5.8 months, from March 22 to September 15. The smallest chance of a wet day is 28% on May 14.

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 59% on January 3.

Daily Chance of Precipitation

Daily Chance of Precipitation at Barra AirportwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 359%Jan 359%May 1428%May 1428%Jan 158%Jan 158%Sep 1543%Sep 1543%Mar 2243%Mar 2243%rain
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. Barra Airport experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year at Barra Airport. The most rain falls during the 31 days centered around January 3, with an average total accumulation of 4.8 inches.

The least rain falls around May 19, with an average total accumulation of 2.0 inches.

Average Monthly Rainfall

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 at Barra Airport varies extremely over the course of the year. In 2019, the shortest day is December 22, with 6 hours, 42 minutes of daylight; the longest day is June 21, with 17 hours, 54 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Barra AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 10 minMar 2012 hr, 10 minMar 2017 hr, 54 minJun 2117 hr, 54 minJun 2112 hr, 16 minSep 2312 hr, 16 minSep 236 hr, 42 minDec 226 hr, 42 minDec 22nightnightday
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 4:34 AM on June 19, and the latest sunrise is 4 hours, 34 minutes later at 9:08 AM on December 29. The earliest sunset is at 3:47 PM on December 15, and the latest sunset is 6 hours, 41 minutes later at 10:28 PM on June 24.

Daylight saving time (DST) is observed at Barra Airport during 2019, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 27.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time at Barra AirportJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 194:34 AMJun 194:34 AM10:28 PMJun 2410:28 PMJun 24Dec 153:47 PMDec 153:47 PM9:08 AMDec 299:08 AMDec 29Mar 31DSTMar 31DSTDSTOct 27DSTOct 27daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2019. 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.

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 at Barra Airport, 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 at Barra AirportJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 180%Jan 180%Aug 40%Aug 40%comfortablecomfortabledrydry
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 at Barra Airport experiences extreme seasonal variation over the course of the year.

The windier part of the year lasts for 5.9 months, from October 1 to March 28, with average wind speeds of more than 19.2 miles per hour. The windiest day of the year is January 7, with an average hourly wind speed of 24.4 miles per hour.

The calmer time of year lasts for 6.1 months, from March 28 to October 1. The calmest day of the year is July 24, with an average hourly wind speed of 14.0 miles per hour.

Average Wind Speed

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 at Barra Airport varies throughout the year.

The wind is most often from the west for 3.1 weeks, from January 12 to February 3; for 1.1 months, from March 1 to April 4; for 1.2 months, from June 25 to August 1; for 1.0 months, from August 10 to September 11; and for 1.4 months, from October 31 to December 13, with a peak percentage of 39% on January 23. The wind is most often from the south for 3.7 weeks, from February 3 to March 1; for 2.7 months, from April 4 to June 25; for 1.3 weeks, from August 1 to August 10; for 1.6 months, from September 11 to October 31; and for 4.3 weeks, from December 13 to January 12, with a peak percentage of 38% on October 1.

Wind Direction

Wind Direction at Barra AirportSWSWSWWSWSJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsouthnortheast
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

Barra Airport 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 3.0 months, from July 7 to October 7, with an average temperature above 55°F. The day of the year with the warmest water is August 11, with an average temperature of 57°F.

The time of year with cooler water lasts for 3.8 months, from January 7 to May 1, with an average temperature below 48°F. The day of the year with the coolest water is March 8, with an average temperature of 46°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 at Barra Airport 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 Barra Airport for general outdoor tourist activities is from early July to late August, with a peak score in the first week of August.

Tourism Score

Tourism Score at Barra Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468104.74.70.00.0 precipitationprecipitationcloudscloudstourism 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 Barra Airport for hot-weather activities is from mid July to mid August, with a peak score in the first week of August.

Beach/Pool Score

Beach/Pool Score at Barra AirportJanFebMarAprMayJunJulAugSepOctNovDec02468100.20.20.00.0 precipitationprecipitationcloudscloudstemperaturetemperature
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 at Barra Airport typically lasts for 10 months (304 days), from around February 23 to around December 25, rarely starting after April 7, or ending before November 23.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Barra Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Feb 2350%Feb 2350%Dec 2550%Dec 2590%Apr 790%Apr 790%Nov 2390%Nov 2330%Jan 1530%Jan 15Jul 31100%Jul 31100%very coldcoldcool
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 at Barra Airport should appear around June 2, only rarely appearing before May 21 or after June 22.

Growing Degree Days

Growing Degree Days at Barra AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F200°F400°F600°F800°F1,000°FJun 290°FJun 290°FNov 11900°FNov 11900°FDec 31923°FDec 31923°F
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 3.2 months, from May 1 to August 8, with an average daily incident shortwave energy per square meter above 4.5 kWh. The brightest day of the year is June 10, with an average of 5.6 kWh.

The darker period of the year lasts for 4.3 months, from October 18 to February 27, with an average daily incident shortwave energy per square meter below 1.3 kWh. The darkest day of the year is December 22, with an average of 0.3 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Barra AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhJun 105.6 kWhJun 105.6 kWhDec 220.3 kWhDec 220.3 kWhAug 84.5 kWhAug 84.5 kWhOct 181.3 kWhOct 181.3 kWhFeb 271.3 kWhFeb 271.3 kWh
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 Barra Airport are 57.025 deg latitude, -7.450 deg longitude, and 0 ft elevation.

The topography within 2 miles of Barra Airport contains significant variations in elevation, with a maximum elevation change of 633 feet and an average elevation above sea level of 70 feet. Within 10 miles contains significant variations in elevation (1,201 feet). Within 50 miles contains very significant variations in elevation (3,136 feet).

The area within 2 miles of Barra Airport is covered by water (51%), grassland (23%), and shrubs (14%), within 10 miles by water (84%), and within 50 miles by water (91%).

Data Sources

This report illustrates the typical weather at Barra Airport, 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

Barra Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back are Benbecula Airport, Tiree Airport, Stornoway Airport, and Oban Airport.

Other Data

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.

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.