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December Weather at Barra Airport United Kingdom

Daily high temperatures decrease by 2°F, from 49°F to 47°F, rarely falling below 41°F or exceeding 54°F.

Daily low temperatures decrease by 2°F, from 42°F to 40°F, rarely falling below 32°F or exceeding 49°F.

For reference, on August 3, the hottest day of the year, temperatures at Barra Airport typically range from 54°F to 62°F, while on February 17, the coldest day of the year, they range from 39°F to 46°F.

Average High and Low Temperature in December at Barra Airport

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 hourly average temperatures for the quarter of the year centered on December. The horizontal axis is the day, 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 December at Barra Airport

Average Hourly Temperature in December at Barra AirportDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJanvery coldcold
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).

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The month of December at Barra Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 69% throughout the month.

The clearest day of the month is December 3, with clear, mostly clear, or partly cloudy conditions 32% of the time.

For reference, on January 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 73%, while on May 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 44%.

Cloud Cover Categories in December at Barra Airport

Cloud Cover Categories in December at Barra AirportDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanDec 132%Dec 132%Dec 3129%Dec 3129%Dec 1131%Dec 1131%Dec 2129%Dec 2129%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.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Barra Airport, the chance of a wet day over the course of December is rapidly increasing, starting the month at 51% and ending it at 58%.

For reference, the year's highest daily chance of a wet day is 59% on January 3, and its lowest chance is 28% on May 13.

Probability of Precipitation in December at Barra Airport

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 month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during December at Barra Airport is gradually increasing, starting the month at 4.3 inches, when it rarely exceeds 6.9 inches or falls below 2.3 inches, and ending the month at 4.8 inches, when it rarely exceeds 6.8 inches or falls below 2.4 inches.

Average Monthly Rainfall in December at Barra Airport

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 snowfall.

Over the course of December at Barra Airport, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 20 minutes, implying an average daily decrease of 40 seconds, and weekly decrease of 4 minutes, 43 seconds.

The shortest day of the month is December 21, with 6 hours, 42 minutes of daylight and the longest day is December 1, with 7 hours, 10 minutes of daylight.

Hours of Daylight and Twilight in December at Barra Airport

Hours of Daylight and Twilight in December at Barra AirportDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 216 hr, 42 minDec 216 hr, 42 minnightnightdaydayDec 17 hr, 10 minDec 17 hr, 10 min
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 of the month at Barra Airport is 8:43 AM on December 1 and the latest sunrise is 25 minutes later at 9:08 AM on December 28.

The earliest sunset is 3:47 PM on December 14 and the latest sunset is 11 minutes later at 3:58 PM on December 31.

Daylight saving time is observed at Barra Airport during 2024, but it neither starts nor ends during December, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 4:34 AM and sets 17 hours, 54 minutes later, at 10:28 PM, while on December 21, the shortest day of the year, it rises at 9:06 AM and sets 6 hours, 42 minutes later, at 3:49 PM.

Sunrise & Sunset with Twilight in December at Barra Airport

Sunrise & Sunset with Twilight in December at Barra AirportDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMNovJan8:43 AM8:43 AMDec 13:53 PMDec 13:53 PM9:08 AM9:08 AMDec 313:58 PMDec 313:58 PM9:01 AM9:01 AMDec 143:47 PMDec 143:47 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of December. 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 figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in December at Barra Airport

Solar Elevation and Azimuth in December at Barra AirportDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJan00100001010
northeastsouthwest
Solar elevation and azimuth over the course of December 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for December 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in December at Barra Airport

Moon Rise, Set & Phases in December at Barra AirportDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanNov 112:48 PMNov 112:48 PMNov 159:29 PMNov 159:29 PMDec 16:22 AMDec 16:22 AMDec 159:02 AMDec 159:02 AMDec 3010:28 PMDec 3010:28 PMJan 1310:28 PMJan 1310:28 PMJan 2912:37 PMJan 2912:37 PM7:48 AM7:48 AM4:15 PM4:15 PM9:39 AM9:39 AM9:46 AM9:46 AM3:05 PM3:05 PM2:10 PM2:10 PM10:10 AM10:10 AM9:51 AM9:51 AM2:31 PM2:31 PM3:02 PM3:02 PM10:04 AM10:04 AM9:15 AM9:15 AM4:33 PM4:33 PM
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.
Dec 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
0%9:46 AMSE3:05 PMSSW-12:25 PMS245,752 mi
2
2%11:02 AMSSE3:42 PMSSW-1:22 PMS243,684 mi
3
6%11:57 AMSSE4:45 PMSSW-2:21 PMS241,555 mi
4
12%12:30 PMSE6:08 PMSW-3:19 PMS239,408 mi
5
20%12:49 PMSE7:42 PMSW-4:15 PMS237,264 mi
6
29%1:00 PMSE9:18 PMWSW-5:08 PMS235,140 mi
7
40%1:07 PMESE10:52 PMWSW-5:58 PMS233,067 mi
8
50%1:12 PMESE--6:46 PMS231,111 mi
9
63%-12:25 AMW1:16 PME7:33 PMS229,378 mi
10
74%-1:58 AMW1:21 PMENE8:20 PMS228,014 mi
11
84%-3:34 AMWNW1:26 PMENE9:10 PMS227,191 mi
12
92%-5:14 AMWNW1:34 PMNE10:04 PMS227,076 mi
13
97%-6:59 AMNW1:47 PMNE11:01 PMS227,791 mi
14
99%-8:42 AMNW2:10 PMNNE--
15
100%-10:10 AMNNW2:53 PMNNE12:02 AMS229,378 mi
16
99%-11:10 AMNNW4:03 PMNNE1:04 AMS231,767 mi
17
96%-11:43 AMNW5:33 PMNE2:03 AMS234,778 mi
18
91%-12:00 PMNW7:07 PMNE2:58 AMS238,150 mi
19
84%-12:09 PMNW8:37 PMENE3:49 AMS241,588 mi
20
75%-12:15 PMWNW10:01 PMENE4:34 AMS244,802 mi
21
66%-12:19 PMWNW11:21 PME5:16 AMS247,544 mi
22
50%-12:23 PMW-5:56 AMS249,620 mi
23
47%12:38 AME12:25 PMW-6:34 AMS250,903 mi
24
37%1:55 AMESE12:29 PMWSW-7:13 AMS251,336 mi
25
28%3:13 AMESE12:33 PMWSW-7:54 AMS250,931 mi
26
20%4:34 AMSE12:39 PMSW-8:37 AMS249,766 mi
27
13%5:59 AMSE12:49 PMSW-9:24 AMS247,971 mi
28
7%7:25 AMSE1:06 PMSW-10:16 AMS245,718 mi
29
2%8:47 AMSSE1:37 PMSSW-11:12 AMS243,205 mi
30
0%9:51 AMSSE2:31 PMSSW-12:11 PMS240,633 mi
31
0%10:32 AMSSE3:50 PMSW-1:11 PMS238,186 mi

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 chance that a given day will be muggy at Barra Airport is essentially constant during December, remaining around 0% throughout.

For reference, on July 21, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in December at Barra Airport

Humidity Comfort Levels in December at Barra AirportDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%NovJanDec 10%Dec 10%Dec 310%Dec 310%Dec 110%Dec 110%Dec 210%Dec 210%drydry
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.

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 is rapidly increasing during December, increasing from 22.2 miles per hour to 24.3 miles per hour over the course of the month.

For reference, on January 7, the windiest day of the year, the daily average wind speed is 24.4 miles per hour, while on July 23, the calmest day of the year, the daily average wind speed is 14.0 miles per hour.

Average Wind Speed in December at Barra Airport

Average Wind Speed in December at Barra AirportDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mph30 mph30 mph35 mph35 mphNovJanDec 122.2 mphDec 122.2 mphDec 3124.3 mphDec 3124.3 mphDec 1623.0 mphDec 1623.0 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction at Barra Airport during December is predominantly out of the west from December 1 to December 12 and the south from December 12 to December 31.

Wind Direction in December at Barra Airport

Wind Direction in December at Barra AirportWSWDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%NovJanwestsouthnortheast
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).

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 surface water temperature at Barra Airport is gradually decreasing during December, falling by 2°F, from 51°F to 49°F, over the course of the month.

Average Water Temperature in December at Barra Airport

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

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 24, rarely starting after April 6, or ending before November 22.

During December at Barra Airport, the chance that a given day is within the growing season is rapidly decreasing falling from 81% to 41% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in December at Barra Airport

Time Spent in Various Temperature Bands and the Growing Season in December at Barra Airportgrowing seasonDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJan81%Dec 181%Dec 1Dec 3141%Dec 3141%69%Dec 1169%Dec 1154%Dec 2154%Dec 2190%Nov 2290%Nov 22very coldcoldcoolfreezing
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.

The average accumulated growing degree days at Barra Airport are essentially constant during December, remaining within 5°F of 919°F throughout.

Growing Degree Days in December at Barra Airport

Growing Degree Days in December at Barra AirportDec1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131750°F750°F800°F800°F850°F850°F900°F900°F950°F950°F1,000°F1,000°F1,050°F1,050°F1,100°F1,100°FNovJanDec 1914°FDec 1914°FDec 31924°FDec 31924°FDec 11918°FDec 11918°FDec 21922°FDec 21922°F
The average growing degree days accumulated over the course of December, with 25th to 75th and 10th to 90th percentile bands.

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 at Barra Airport is essentially constant during December, remaining around 0.3 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 0.3 kWh on December 21.

Average Daily Incident Shortwave Solar Energy in December at Barra Airport

Average Daily Incident Shortwave Solar Energy in December at Barra AirportDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 kWh0.0 kWh0.2 kWh0.2 kWh0.4 kWh0.4 kWh0.6 kWh0.6 kWh0.8 kWh0.8 kWh1.0 kWh1.0 kWh1.2 kWh1.2 kWh1.4 kWh1.4 kWhNovJanDec 210.3 kWhDec 210.3 kWhDec 10.4 kWhDec 10.4 kWhDec 310.3 kWhDec 310.3 kWhDec 110.3 kWhDec 110.3 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.

For the purposes of this report, the geographical coordinates of Barra Airport are 57.025 deg latitude, -7.450 deg longitude, and 16 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%).

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 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 © OpenStreetMap contributors.

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.

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