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Climate and Average Weather Year Round at Glasgow International Airport Montana, United States

At Glasgow International Airport, the summers are warm; the winters are freezing, snowy, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 6°F to 87°F and is rarely below -16°F or above 97°F.

Based on the tourism score, the best time of year to visit Glasgow International Airport for warm-weather activities is from late June to late August.

Climate at Glasgow International Airport

freezingcoldcoolwarmhotwarmcoolcoldfreezingJanFebMarAprMayJunJulAugSepOctNovDecNowNow76%76%39%39%clearovercastprecipitation: 2.2 inprecipitation: 2.2 in0.1 in0.1 inmuggy: 2%muggy: 2%0%0%drydrytourism score: 7.0tourism score: 7.00.00.0
Glasgow International Airport weather by month. Click on each chart for more information.

The hot season lasts for 3.3 months, from June 4 to September 13, with an average daily high temperature above 74°F. The hottest month of the year at Glasgow International Airport is July, with an average high of 86°F and low of 59°F.

The cold season lasts for 3.2 months, from November 22 to February 28, with an average daily high temperature below 36°F. The coldest month of the year at Glasgow International Airport is January, with an average low of 7°F and high of 24°F.

Average High and Low Temperature at Glasgow International Airport

Average High and Low Temperature at Glasgow International AirporthotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-20°F-20°F-10°F-10°F0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 123°FJan 123°FJul 2787°FJul 2787°F6°F6°F60°F60°FJun 474°FJun 474°FSep 1374°FSep 1374°FNov 2236°FNov 2236°FFeb 2836°FFeb 2836°F51°F51°F48°F48°F18°F18°F17°F17°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.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 24°F30°F44°F59°F69°F78°F86°F85°F73°F58°F40°F27°F
Temp. 15°F20°F31°F45°F56°F64°F72°F70°F59°F45°F30°F17°F
Low 7°F12°F23°F34°F45°F53°F59°F57°F47°F35°F22°F10°F

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 at Glasgow International Airport

Average Hourly Temperature at Glasgow International AirportJanFebMarAprMayJunJulAugSepOctNovDec12 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 AMNowNowfrigidfrigidfrigidfreezingfreezingvery coldcoldcoldcoolcomfortablewarmvery coldfrigidcomfortable
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.

Bayzhansay, Kazakhstan (6,126 miles away); Talghar, Kazakhstan (6,116 miles); and Jiayuguan, China (6,173 miles) are the far-away foreign places with temperatures most similar to Glasgow International Airport (view comparison).

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At Glasgow International Airport, 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 at Glasgow International Airport begins around June 12 and lasts for 3.8 months, ending around October 6.

The clearest month of the year at Glasgow International Airport is July, during which on average the sky is clear, mostly clear, or partly cloudy 73% of the time.

The cloudier part of the year begins around October 6 and lasts for 8.2 months, ending around June 12.

The cloudiest month of the year at Glasgow International Airport is March, during which on average the sky is overcast or mostly cloudy 60% of the time.

Cloud Cover Categories at Glasgow International Airport

Cloud Cover Categories at Glasgow International AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 2776%Jul 2776%Mar 1439%Mar 1439%Jun 1258%Jun 1258%Oct 658%Oct 658%NowNowclearmostly clearpartly cloudyovercastmostly cloudy
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.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 59%58%60%53%49%40%27%28%38%46%53%57%
Clearer 41%42%40%47%51%60%73%72%62%54%47%43%

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

The wetter season lasts 3.8 months, from April 24 to August 17, with a greater than 16% chance of a given day being a wet day. The month with the most wet days at Glasgow International Airport is June, with an average of 8.5 days with at least 0.04 inches of precipitation.

The drier season lasts 8.2 months, from August 17 to April 24. The month with the fewest wet days at Glasgow International Airport is February, with an average of 0.8 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. Based on this categorization, the most common form of precipitation at Glasgow International Airport changes throughout the year.

Rain alone is the most common for 8.4 months, from February 29 to November 11. The month with the most days of rain alone at Glasgow International Airport is June, with an average of 8.5 days.

Snow alone is the most common for 3.6 months, from November 11 to February 28. The month with the most days of snow alone at Glasgow International Airport is December, with an average of 1.1 days.

Daily Chance of Precipitation at Glasgow International Airport

Daily Chance of Precipitation at Glasgow International AirportsnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jun 630%Jun 630%Feb 122%Feb 122%Nov 116%Nov 116%Apr 2416%Apr 2416%Aug 1716%Aug 1716%NowNowrainsnow
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).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 0.1d0.2d1.1d3.5d7.0d8.5d6.6d4.9d3.9d2.4d0.7d0.1d
Mixed 0.1d0.1d0.3d0.3d0.3d0.0d0.0d0.0d0.0d0.2d0.2d0.1d
Snow 1.0d0.5d0.5d0.2d0.0d0.0d0.0d0.0d0.0d0.2d0.7d1.1d
Any 1.2d0.8d1.9d4.0d7.3d8.5d6.6d4.9d3.9d2.7d1.5d1.3d

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. Glasgow International Airport experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 6.4 months, from April 7 to October 19, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain at Glasgow International Airport is June, with an average rainfall of 2.1 inches.

The rainless period of the year lasts for 5.6 months, from October 19 to April 7. The month with the least rain at Glasgow International Airport is January, with an average rainfall of 0.0 inches.

Average Monthly Rainfall at Glasgow International Airport

Average Monthly Rainfall at Glasgow International AirportrainJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 inJun 62.2 inJun 62.2 inJan 220.0 inJan 220.0 inApr 70.5 inApr 70.5 inOct 190.5 inOct 190.5 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 snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 0.0″0.0″0.2″0.7″1.8″2.1″1.4″1.0″0.9″0.6″0.1″0.0″

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Glasgow International Airport experiences some seasonal variation in monthly snowfall.

The snowy period of the year lasts for 2.2 months, from November 21 to January 27, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Glasgow International Airport is December, with an average snowfall of 1.5 inches.

The snowless period of the year lasts for 9.8 months, from January 27 to November 21. The least snow falls around July 30, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall at Glasgow International Airport

Average Monthly Snowfall at Glasgow International AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 inDec 311.7 inDec 311.7 inJul 300.0 inJul 300.0 inMar 200.9 inMar 200.9 inJan 271.0 inJan 271.0 inNowNow
The average snowfall (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 rainfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Snowfall 1.3″0.7″0.9″0.6″0.3″0.0″0.0″0.0″0.1″0.4″0.9″1.5″

The length of the day at Glasgow International Airport varies extremely over the course of the year. In 2024, the shortest day is December 21, with 8 hours, 20 minutes of daylight; the longest day is June 20, with 16 hours, 5 minutes of daylight.

Hours of Daylight and Twilight at Glasgow International Airport

Hours of Daylight and Twilight at Glasgow International AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 9 minMar 1912 hr, 9 minMar 1916 hr, 5 minJun 2016 hr, 5 minJun 2012 hr, 12 minSep 2212 hr, 12 minSep 228 hr, 20 minDec 218 hr, 20 minDec 21nightnightdayNowNow
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.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 8.9h10.2h12.0h13.7h15.2h16.0h15.6h14.2h12.5h10.8h9.2h8.4h

The earliest sunrise is at 5:05 AM on June 16, and the latest sunrise is 2 hours, 52 minutes later at 7:57 AM on December 31. The earliest sunset is at 4:12 PM on December 10, and the latest sunset is 4 hours, 59 minutes later at 9:11 PM on June 25.

Daylight saving time (DST) is observed at Glasgow International Airport during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time at Glasgow International Airport

Sunrise & Sunset with Twilight and Daylight Saving Time at Glasgow International AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 165:05 AMJun 165:05 AM9:11 PMJun 259:11 PMJun 25Dec 104:12 PMDec 104:12 PM7:57 AMDec 317:57 AMDec 31Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunsetNowNow
The solar day over the course of the year 2024. 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.

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 at Glasgow International Airport

Solar Elevation and Azimuth at Glasgow International AirportJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM00010101010202030304040506000010101020202020303040405050601865NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 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 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.

Moon Rise, Set & Phases at Glasgow International Airport

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.

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 Glasgow International 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, staying within 1% of 1% throughout.

Humidity Comfort Levels at Glasgow International Airport

Humidity Comfort Levels at Glasgow International AirportJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Mar 130%Mar 130%Jul 182%Jul 182%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.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.0d0.1d0.4d0.1d0.0d0.0d0.0d0.0d

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 Glasgow International Airport experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.9 months, from November 24 to June 21, with average wind speeds of more than 10.7 miles per hour. The windiest month of the year at Glasgow International Airport is April, with an average hourly wind speed of 11.6 miles per hour.

The calmer time of year lasts for 5.1 months, from June 21 to November 24. The calmest month of the year at Glasgow International Airport is August, with an average hourly wind speed of 9.9 miles per hour.

Average Wind Speed at Glasgow International Airport

Average Wind Speed at Glasgow International AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mphMay 911.8 mphMay 911.8 mphJul 299.6 mphJul 299.6 mphNov 2410.7 mphNov 2410.7 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 11.010.911.411.611.510.89.99.910.411.010.810.9

The predominant average hourly wind direction at Glasgow International Airport varies throughout the year.

The wind is most often from the east for 1.0 weeks, from July 30 to August 6, with a peak percentage of 29% on July 31. The wind is most often from the west for 12 months, from August 6 to July 30, with a peak percentage of 50% on January 1.

Wind Direction at Glasgow International Airport

Wind Direction at Glasgow International AirportWWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwesteastnorthsouth
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).

To characterize how pleasant the weather is at Glasgow International 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 Glasgow International Airport for general outdoor tourist activities is from late June to late August, with a peak score in the last week of July.

Tourism Score at Glasgow International Airport

Tourism Score at Glasgow International Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.07.00.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism 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 Glasgow International Airport for hot-weather activities is from early July to mid August, with a peak score in the last week of July.

Beach/Pool Score at Glasgow International Airport

Beach/Pool Score at Glasgow International AirportJanFebMarAprMayJunJulAugSepOctNovDec002244668810104.34.30.00.0NowNow cloudscloudsprecipitationprecipitationbeach/pool score
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.

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 Glasgow International Airport typically lasts for 4.7 months (146 days), from around May 6 to around September 29, rarely starting before April 18 or after May 23, and rarely ending before September 11 or after October 16.

Time Spent in Various Temperature Bands and the Growing Season at Glasgow International Airport

Time Spent in Various Temperature Bands and the Growing Season at Glasgow International Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 650%May 650%Sep 2950%Sep 2950%May 2390%May 2390%Sep 1190%Sep 1190%Apr 1810%Apr 1810%Oct 1610%Oct 1610%0%Dec 40%Dec 4Jul 17100%Jul 17100%NowNowfrigidfreezingvery coldcoldcoolcomfortablewarmhot
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 Glasgow International Airport should appear around April 24, only rarely appearing before April 13 or after May 9.

Growing Degree Days at Glasgow International Airport

Growing Degree Days at Glasgow International AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°FApr 2490°FApr 2490°FJul 5900°FJul 5900°FAug 171,800°FAug 171,800°FDec 312,461°FDec 312,461°F
The average growing degree days accumulated over the course of the year, 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 experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.4 months, from May 5 to August 18, with an average daily incident shortwave energy per square meter above 6.2 kWh. The brightest month of the year at Glasgow International Airport is July, with an average of 7.3 kWh.

The darker period of the year lasts for 3.5 months, from October 27 to February 13, with an average daily incident shortwave energy per square meter below 2.5 kWh. The darkest month of the year at Glasgow International Airport is December, with an average of 1.3 kWh.

Average Daily Incident Shortwave Solar Energy at Glasgow International Airport

Average Daily Incident Shortwave Solar Energy at Glasgow International AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJul 37.4 kWhJul 37.4 kWhDec 231.2 kWhDec 231.2 kWhMay 56.2 kWhMay 56.2 kWhAug 186.2 kWhAug 186.2 kWhOct 272.5 kWhOct 272.5 kWhFeb 132.5 kWhFeb 132.5 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.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 1.62.53.95.46.47.17.36.34.63.01.81.3

For the purposes of this report, the geographical coordinates of Glasgow International Airport are 48.212 deg latitude, -106.615 deg longitude, and 2,290 ft elevation.

The topography within 2 miles of Glasgow International Airport contains only modest variations in elevation, with a maximum elevation change of 266 feet and an average elevation above sea level of 2,223 feet. Within 10 miles contains only modest variations in elevation (689 feet). Within 50 miles contains significant variations in elevation (1,352 feet).

The area within 2 miles of Glasgow International Airport is covered by grassland (64%) and cropland (33%), within 10 miles by grassland (74%) and cropland (26%), and within 50 miles by grassland (80%) and cropland (12%).

This report illustrates the typical weather at Glasgow International 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

Glasgow International 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 Jordan Airport; Lyman Clayton Airport; Rockglen, Sask.; Val Marie Southeast, Sask; Coronach Spc; Assiniboia Airport; Dawson Community Airport; and Sidney-Richland Municipal 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.

Please review our full terms contained on our Terms of Service page.