Average Weather in July at Bettles Airport Alaska, United States
Daily high temperatures decrease by 4°F, from 71°F to 67°F, rarely falling below 58°F or exceeding 81°F.
Daily low temperatures decrease by 2°F, from 51°F to 49°F, rarely falling below 41°F or exceeding 58°F. The highest daily average low temperature is 51°F on July 4.
For reference, on June 29, the hottest day of the year, temperatures at Bettles Airport typically range from 51°F to 71°F, while on January 18, the coldest day of the year, they range from -17°F to -2°F.
Average High and Low Temperature in July
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on July. 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 July
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 month of July at Bettles Airport experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 56% to 63%.
The clearest day of the month is July 1, with clear, mostly clear, or partly cloudy conditions 44% of the time.
For reference, on September 24, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 65%, while on March 6, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 48%.
Cloud Cover Categories in July
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. At Bettles Airport, the chance of a wet day over the course of July is very rapidly increasing, starting the month at 24% and ending it at 34%.
For reference, the year's highest daily chance of a wet day is 34% on August 1, and its lowest chance is 8% on March 19.
Probability of Precipitation in July
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 July at Bettles Airport is increasing, starting the month at 1.8 inches, when it rarely exceeds 3.2 inches or falls below 0.7 inches, and ending the month at 2.5 inches, when it rarely exceeds 4.3 inches or falls below 1.1 inches.
Average Monthly Rainfall in July
Due to its extreme latitude, Bettles Airport experiences polar day (also known as the midnight Sun) during the summer. The precise start and end dates of polar day and night vary from year to year and depend on the precise location and elevation of the observer, and the local topography.
In the summer at Bettles Airport during 2019, the Sun is continuously above the horizon for 1.2 months, rising at 2:21 AM on June 2, and not setting again until 2:08 AM on July 10. As such, July begins the month in polar day, which ends before the month is out.
The shortest day of the month is July 31, with 19 hours, 12 minutes of daylight.
Hours of Daylight and Twilight in July
The earliest sunrise of the month at Bettles Airport is 2:14 AM on July 10 and the latest sunrise is 2 hours, 20 minutes later at 4:34 AM on July 31.
The latest sunset is 2:08 AM on July 9 and the earliest sunset is 2 hours, 22 minutes earlier at 11:46 PM on July 31.
Daylight saving time is observed at Bettles Airport during 2019, but it neither starts nor ends during July, so the entire month is in daylight saving time.
Sunrise & Sunset with Twilight in July
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 Bettles Airport is essentially constant during July, remaining around 0% throughout.
For reference, on April 27, 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 July
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 Bettles Airport is essentially constant during July, remaining within 0.1 miles per hour of 5.6 miles per hour throughout.
For reference, on January 9, the windiest day of the year, the daily average wind speed is 8.1 miles per hour, while on August 21, the calmest day of the year, the daily average wind speed is 5.5 miles per hour.
Average Wind Speed in July
Wind Direction in July
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 Bettles Airport typically lasts for 3.2 months (99 days), from around May 21 to around August 28, rarely starting before May 5 or after June 7, and rarely ending before August 10 or after September 17.
The month of July at Bettles Airport is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in July
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.
The average accumulated growing degree days at Bettles Airport are increasing during July, increasing by 307°F, from 381°F to 688°F, over the course of the month.
Growing Degree Days in July
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 Bettles Airport is decreasing during July, falling by 1.3 kWh, from 5.7 kWh to 4.4 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in July
For the purposes of this report, the geographical coordinates of Bettles Airport are 66.915 deg latitude, -151.528 deg longitude, and 643 ft elevation.
The topography within 2 miles of Bettles Airport contains only modest variations in elevation, with a maximum elevation change of 223 feet and an average elevation above sea level of 642 feet. Within 10 miles contains only modest variations in elevation (2,408 feet). Within 50 miles contains large variations in elevation (5,456 feet).
The area within 2 miles of Bettles Airport is covered by shrubs (50%) and trees (45%), within 10 miles by shrubs (51%) and trees (41%), and within 50 miles by shrubs (62%) and trees (23%).
This report illustrates the typical weather at Bettles Airport year round, 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
Bettles 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.
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.
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.