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August Weather at Northern Rockies Regional Airport Canada

Daily high temperatures decrease by 9°F, from 75°F to 66°F, rarely falling below 55°F or exceeding 84°F.

Daily low temperatures decrease by 8°F, from 53°F to 44°F, rarely falling below 36°F or exceeding 59°F.

For reference, on July 23, the hottest day of the year, temperatures at Northern Rockies Regional Airport typically range from 53°F to 75°F, while on January 12, the coldest day of the year, they range from -9°F to 6°F.

Average High and Low Temperature in August at Northern Rockies Regional Airport

Average High and Low Temperature in August at Northern Rockies Regional AirportAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313125°F25°F30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°FJulSepAug 175°FAug 175°F53°F53°FAug 3166°FAug 3166°F44°F44°FAug 1173°FAug 1173°F51°F51°FAug 2170°FAug 2170°F48°F48°F
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 August. 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 August at Northern Rockies Regional Airport

Average Hourly Temperature in August at Northern Rockies Regional AirportAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJulSepvery coldvery coldcoldcoolcoolcomfortable
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.

Irkutsk, Russia (4,327 miles away) is the far-away foreign place with temperatures most similar to Northern Rockies Regional Airport (view comparison).

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The month of August at Northern Rockies Regional Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 53% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 52% on August 7.

The clearest day of the month is August 7, with clear, mostly clear, or partly cloudy conditions 48% of the time.

For reference, on March 4, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 70%, while on August 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 48%.

Cloud Cover Categories in August at Northern Rockies Regional Airport

Cloud Cover Categories in August at Northern Rockies Regional AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSepMar 430%Mar 430%Aug 147%Aug 147%Aug 3145%Aug 3145%Aug 1148%Aug 1148%Aug 2146%Aug 2146%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 Northern Rockies Regional Airport, the chance of a wet day over the course of August is gradually decreasing, starting the month at 25% and ending it at 22%.

For reference, the year's highest daily chance of a wet day is 30% on July 13, and its lowest chance is 9% on February 21.

Probability of Precipitation in August at Northern Rockies Regional Airport

Probability of Precipitation in August at Northern Rockies Regional AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%5%5%10%10%15%15%20%20%25%25%30%30%JulSepAug 125%Aug 125%Aug 3122%Aug 3122%Aug 1124%Aug 1124%Aug 2123%Aug 2123%rainmixed
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 August at Northern Rockies Regional Airport is decreasing, starting the month at 2.5 inches, when it rarely exceeds 4.3 inches or falls below 0.8 inches, and ending the month at 1.8 inches, when it rarely exceeds 3.9 inches or falls below 0.5 inches.

Average Monthly Rainfall in August at Northern Rockies Regional 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 August at Northern Rockies Regional Airport, the length of the day is very rapidly decreasing. From the start to the end of the month, the length of the day decreases by 2 hours, 27 minutes, implying an average daily decrease of 4 minutes, 55 seconds, and weekly decrease of 34 minutes, 23 seconds.

The shortest day of the month is August 31, with 14 hours, 4 minutes of daylight and the longest day is August 1, with 16 hours, 31 minutes of daylight.

Hours of Daylight and Twilight in August at Northern Rockies Regional Airport

Hours of Daylight and Twilight in August at Northern Rockies Regional AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrJulSepnightnightdaydayAug 116 hr, 31 minAug 116 hr, 31 minAug 3114 hr, 4 minAug 3114 hr, 4 minAug 1615 hr, 20 minAug 1615 hr, 20 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 Northern Rockies Regional Airport is 5:00 AM on August 1 and the latest sunrise is 1 hour, 7 minutes later at 6:07 AM on August 31.

The latest sunset is 9:31 PM on August 1 and the earliest sunset is 1 hour, 20 minutes earlier at 8:11 PM on August 31.

Daylight saving time is not observed at Northern Rockies Regional Airport during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 3:58 AM and sets 18 hours, 27 minutes later, at 10:25 PM, while on December 21, the shortest day of the year, it rises at 10:02 AM and sets 6 hours, 13 minutes later, at 4:15 PM.

Sunrise & Sunset with Twilight in August at Northern Rockies Regional Airport

Sunrise & Sunset with Twilight in August at Northern Rockies Regional AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJulSep5:00 AM5:00 AMAug 19:31 PMAug 19:31 PM6:07 AM6:07 AMAug 318:11 PMAug 318:11 PM5:22 AM5:22 AMAug 119:06 PMAug 119:06 PM5:45 AM5:45 AMAug 218:39 PMAug 218:39 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of August. 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 August at Northern Rockies Regional Airport

Solar Elevation and Azimuth in August at Northern Rockies Regional AirportAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMJulSep00101020202030304040500001010202030304050
northeastsouthwest
Solar elevation and azimuth over the course of August 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 August 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 August at Northern Rockies Regional Airport

Moon Rise, Set & Phases in August at Northern Rockies Regional AirportAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMJulSepJul 53:58 PMJul 53:58 PMJul 213:18 AMJul 213:18 AMAug 44:14 AMAug 44:14 AMAug 1911:26 AMAug 1911:26 AMSep 26:56 PMSep 26:56 PMSep 177:35 PMSep 177:35 PM2:36 AM2:36 AM11:25 PM11:25 PM10:39 PM10:39 PM4:45 AM4:45 AM10:02 PM10:02 PM9:05 PM9:05 PM5:01 AM5:01 AM5:24 AM5:24 AM8:17 PM8:17 PM7:23 PM7:23 PM7:37 AM7:37 AM
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.
Aug 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
8%12:24 AMNNE9:29 PMNNW-11:02 AMS240,991 mi
2
3%1:38 AMNNE9:49 PMNNW-11:57 AMS243,201 mi
3
0%3:10 AMNE9:58 PMNW-12:48 PMS245,329 mi
4
0%4:45 AMNE10:02 PMNW-1:35 PMS247,313 mi
5
2%6:15 AMENE10:04 PMWNW-2:19 PMS249,067 mi
6
6%7:41 AMENE10:05 PMWNW-2:59 PMS250,485 mi
7
11%9:02 AME10:06 PMW-3:38 PMS251,448 mi
8
18%10:22 AME10:06 PMW-4:17 PMS251,836 mi
9
26%11:41 AMESE10:06 PMWSW-4:56 PMS251,544 mi
10
35%1:03 PMESE10:07 PMWSW-5:36 PMS250,498 mi
11
44%2:28 PMSE10:10 PMSW-6:20 PMS248,667 mi
12
50%3:59 PMSE10:15 PMSW-7:07 PMS246,084 mi
13
65%5:33 PMSSE10:26 PMSSW-8:00 PMS242,851 mi
14
75%7:02 PMSSE10:52 PMSSW-8:57 PMS239,154 mi
15
84%8:09 PMSSE11:49 PMSSW-9:59 PMS235,254 mi
16
91%8:43 PMSSE--11:02 PMS231,479 mi
17
94%-1:21 AMSSW8:58 PMSE--
18
97%-3:10 AMSW9:05 PMSE12:04 AMS228,178 mi
19
100%-5:01 AMSW9:09 PMESE1:03 AMS225,670 mi
20
99%-6:49 AMWSW9:11 PMESE1:57 AMS224,186 mi
21
96%-8:34 AMW9:12 PME2:49 AMS223,834 mi
22
90%-10:17 AMW9:13 PMENE3:39 AMS224,582 mi
23
81%-12:00 PMWNW9:15 PMENE4:28 AMS226,281 mi
24
71%-1:45 PMNW9:19 PMNE5:18 AMS228,700 mi
25
59%-3:31 PMNW9:26 PMNE6:11 AMS231,573 mi
26
50%-5:14 PMNNW9:42 PMNNE7:05 AMS234,649 mi
27
37%-6:41 PMNNW10:17 PMNNE8:01 AMS237,715 mi
28
26%-7:34 PMNNW11:23 PMNNE8:58 AMS240,619 mi
29
18%-7:58 PMNNW-9:53 AMS243,267 mi
30
10%12:52 AMNNE8:09 PMNW-10:44 AMS245,611 mi
31
5%2:26 AMNE8:14 PMNW-11:32 AMS247,635 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 Northern Rockies Regional Airport is essentially constant during August, remaining around 0% throughout.

For reference, on July 28, 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 August at Northern Rockies Regional Airport

Humidity Comfort Levels in August at Northern Rockies Regional AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%JulSepAug 10%Aug 10%Aug 310%Aug 310%Aug 110%Aug 110%Aug 210%Aug 210%comfortablecomfortabledrydryhumidhumid
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 Northern Rockies Regional Airport is essentially constant during August, remaining within 0.1 miles per hour of 3.4 miles per hour throughout.

For reference, on January 29, the windiest day of the year, the daily average wind speed is 4.5 miles per hour, while on July 20, the calmest day of the year, the daily average wind speed is 3.3 miles per hour.

Average Wind Speed in August at Northern Rockies Regional Airport

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction at Northern Rockies Regional Airport throughout August is predominantly from the west, with a peak proportion of 52% on August 4.

Wind Direction in August at Northern Rockies Regional Airport

Wind Direction in August at Northern Rockies Regional AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%JulSepwestsouthnortheast
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).

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 Northern Rockies Regional Airport typically lasts for 4.0 months (123 days), from around May 14 to around September 15, rarely starting before April 28 or after May 30, and rarely ending before August 26 or after October 3.

The month of August at Northern Rockies Regional Airport is more likely than not fully within the growing season, with the chance that a given day is in the growing season decreasing from 100% to 83% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in August at Northern Rockies Regional Airport

Time Spent in Various Temperature Bands and the Growing Season in August at Northern Rockies Regional Airportgrowing seasonAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSep100%Aug 1100%Aug 183%Aug 3183%Aug 3199%Aug 1199%Aug 1194%Aug 2194%Aug 2150%Sep 1550%Sep 15Jul 13100%Jul 13100%very coldcoldcoolcomfortablewarmfreezing
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 Northern Rockies Regional Airport are increasing during August, increasing by 295°F, from 910°F to 1,205°F, over the course of the month.

Growing Degree Days in August at Northern Rockies Regional Airport

Growing Degree Days in August at Northern Rockies Regional AirportAug1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131800°F800°F900°F900°F1,000°F1,000°F1,100°F1,100°F1,200°F1,200°F1,300°F1,300°F1,400°F1,400°FJulSepAug 1910°FAug 1910°FAug 311,205°FAug 311,205°FAug 111,033°FAug 111,033°FAug 211,132°FAug 211,132°F
The average growing degree days accumulated over the course of August, 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 Northern Rockies Regional Airport is decreasing during August, falling by 1.4 kWh, from 5.4 kWh to 3.9 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in August at Northern Rockies Regional Airport

Average Daily Incident Shortwave Solar Energy in August at Northern Rockies Regional AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhJulSepAug 15.4 kWhAug 15.4 kWhAug 313.9 kWhAug 313.9 kWhAug 115.0 kWhAug 115.0 kWhAug 214.5 kWhAug 214.5 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 Northern Rockies Regional Airport are 58.837 deg latitude, -122.600 deg longitude, and 1,243 ft elevation.

The topography within 2 miles of Northern Rockies Regional Airport contains significant variations in elevation, with a maximum elevation change of 545 feet and an average elevation above sea level of 1,171 feet. Within 10 miles contains significant variations in elevation (1,266 feet). Within 50 miles contains very significant variations in elevation (4,150 feet).

The area within 2 miles of Northern Rockies Regional Airport is covered by trees (81%), within 10 miles by trees (81%), and within 50 miles by trees (86%) and herbaceous vegetation (10%).

This report illustrates the typical weather at Northern Rockies Regional 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

Northern Rockies Regional 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.

There are no other weather stations in our network within 200 kilometers of this location. Consequently, in the case of missing or erroneous measurements from this station, we fall back on NASA's MERRA-2 modern-era reanalysis , adjusted according to typical seasonal and diurnal differences between this station and the wide-area MERRA-2 reconstructed values.

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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