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 early July to late August.
Climate at Glasgow International Airport
The hot season lasts for 3.3 months, from June 5 to September 14, 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 23 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
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
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
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).
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 13 and lasts for 3.8 months, ending around October 7.
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 7 and lasts for 8.2 months, ending around June 13.
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
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
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 25 to August 18, 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 18 to April 25. The month with the fewest wet days at Glasgow International Airport is February, with an average of 0.7 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 March 1 to November 12. 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 12 to March 1. 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
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 8 to October 20, 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 20 to April 8. 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
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 22 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 1.4 inches.
The snowless period of the year lasts for 9.8 months, from January 27 to November 22. The least snow falls around July 31, with an average total accumulation of 0.0 inches.
Average Monthly Snowfall at Glasgow International Airport
The length of the day at Glasgow International Airport varies extremely over the course of the year. In 2022, the shortest day is December 21, with 8 hours, 20 minutes of daylight; the longest day is June 21, with 16 hours, 5 minutes of daylight.
Hours of Daylight and Twilight at Glasgow International Airport
The earliest sunrise is at 5:05 AM on June 16, and the latest sunrise is 2 hours, 53 minutes later at 7:58 AM on November 5. The earliest sunset is at 4:12 PM on December 11, 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 2022, starting in the spring on March 13, lasting 7.8 months, and ending in the fall on November 6.
Sunrise & Sunset with Twilight and Daylight Saving Time at Glasgow International Airport
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
The figure below presents a compact representation of key lunar data for 2022. 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
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
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 25 to June 22, 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 22 to November 25. 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
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 31 to August 7, with a peak percentage of 29% on August 1. The wind is most often from the west for 12 months, from August 7 to July 31, with a peak percentage of 50% on January 1.
Wind Direction at Glasgow International Airport
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 early July to late August, with a peak score in the last week of July.
Tourism Score at Glasgow International Airport
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 mid July to mid August, with a peak score in the last week of July.
Beach/Pool Score at Glasgow International Airport
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 7 to around September 30, rarely starting before April 19 or after May 24, and rarely ending before September 12 or after October 17.
Time Spent in Various Temperature Bands and the Growing Season at Glasgow International Airport
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
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
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 6 to August 19, 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 28 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
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.
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.
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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