Average Weather in October in Sun Valley Arizona, United States
Daily high temperatures decrease by 12°F, from 80°F to 68°F, rarely falling below 57°F or exceeding 87°F.
Daily low temperatures decrease by 10°F, from 53°F to 43°F, rarely falling below 35°F or exceeding 60°F.
For reference, on July 3, the hottest day of the year, temperatures in Sun Valley typically range from 63°F to 92°F, while on January 5, the coldest day of the year, they range from 31°F to 52°F.
Average High and Low Temperature in October
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. 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 October
Torre del Campo, Spain (5,629 miles away); Elbasan, Albania (6,389 miles); and Al Quţayfah, Syria (7,306 miles) are the far-away foreign places with temperatures most similar to Sun Valley (view comparison).
The month of October in Sun Valley experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 18% to 28%.
The clearest day of the month is October 1, with clear, mostly clear, or partly cloudy conditions 82% of the time.
For reference, on February 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 42%, while on June 14, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 83%.
Cloud Cover Categories in October
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Sun Valley, the chance of a wet day over the course of October is essentially constant, remaining around 11% throughout.
For reference, the year's highest daily chance of a wet day is 37% on August 4, and its lowest chance is 3% on June 13.
Probability of Precipitation in October
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 October in Sun Valley is essentially constant, remaining about 1.0 inches throughout, and rarely exceeding 2.6 inches.
The lowest average 31-day accumulation is 1.0 inches on October 23.
Average Monthly Rainfall in October
Over the course of October in Sun Valley, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 1 minute, implying an average daily decrease of 2 minutes, 2 seconds, and weekly decrease of 14 minutes, 11 seconds.
The shortest day of the month is October 31, with 10 hours, 49 minutes of daylight and the longest day is October 1, with 11 hours, 49 minutes of daylight.
Hours of Daylight and Twilight in October
The earliest sunrise of the month in Sun Valley is 6:19 AM on October 1 and the latest sunrise is 24 minutes later at 6:44 AM on October 31.
The latest sunset is 6:09 PM on October 1 and the earliest sunset is 36 minutes earlier at 5:32 PM on October 31.
Daylight saving time is not observed in Sun Valley during 2018.
For reference, on June 21, the longest day of the year, the Sun rises at 5:13 AM and sets 14 hours, 27 minutes later, at 7:40 PM, while on December 21, the shortest day of the year, it rises at 7:27 AM and sets 9 hours, 52 minutes later, at 5:19 PM.
Sunrise & Sunset with Twilight in October
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 in Sun Valley is essentially constant during October, remaining around 0% throughout.
For reference, on August 6, the muggiest day of the year, there are muggy conditions 3% 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 October
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 in Sun Valley is essentially constant during October, remaining within 0.1 miles per hour of 5.4 miles per hour throughout.
For reference, on April 11, the windiest day of the year, the daily average wind speed is 6.3 miles per hour, while on August 12, the calmest day of the year, the daily average wind speed is 4.1 miles per hour.
Average Wind Speed in October
Wind Direction in October
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 in Sun Valley typically lasts for 7.3 months (222 days), from around April 2 to around November 10, rarely starting before March 9 or after April 29, and rarely ending before October 20 or after December 1.
The month of October in Sun Valley is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly decreasing from 100% to 72% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in October
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 in Sun Valley are increasing during October, increasing by 338°F, from 3,766°F to 4,104°F, over the course of the month.
Growing Degree Days in October
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 in Sun Valley is decreasing during October, 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 October
For the purposes of this report, the geographical coordinates of Sun Valley are 34.254 deg latitude, -111.261 deg longitude, and 4,902 ft elevation.
The topography within 2 miles of Sun Valley contains significant variations in elevation, with a maximum elevation change of 558 feet and an average elevation above sea level of 4,798 feet. Within 10 miles contains significant variations in elevation (3,678 feet). Within 50 miles also contains extreme variations in elevation (7,090 feet).
The area within 2 miles of Sun Valley is covered by shrubs (53%) and trees (47%), within 10 miles by shrubs (51%) and trees (49%), and within 50 miles by shrubs (63%) and trees (35%).
This report illustrates the typical weather in Sun Valley 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
There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Sun Valley.
For each station, the records are corrected for the elevation difference between that station and Sun Valley according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Sun Valley is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sun Valley and a given station.
The stations contributing to this reconstruction are: Payson Airport (94%, 7 kilometers, west); Winslow Municipal Airport (3.3%, 99 kilometers, northeast); and Show Low Municipal Airport (2.4%, 115 kilometers, east).
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.