Average Weather in October in Granite Falls Washington, United States
In Granite Falls, the month of October is characterized by very rapidly falling daily high temperatures, with daily highs decreasing by 17°F, from 67°F to 50°F over the course of the month, and rarely exceeding 76°F or dropping below 42°F.
Daily low temperatures decrease by 10°F, from 44°F to 35°F, rarely falling below 26°F or exceeding 52°F.
For reference, on August 1, the hottest day of the year, temperatures in Granite Falls typically range from 59°F to 86°F, while on December 25, the coldest day of the year, they range from 21°F to 30°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
The month of October in Granite Falls experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 43% to 59%.
The clearest day of the month is October 1, with clear, mostly clear, or partly cloudy conditions 57% of the time.
For reference, on January 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 67%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 79%.
Cloud Cover Categories in October
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Granite Falls, the chance of a wet day over the course of October is very rapidly increasing, starting the month at 13% and ending it at 31%.
For reference, the year's highest daily chance of a wet day is 38% on November 18, and its lowest chance is 6% on August 10.
Over the course of October in Granite Falls, the chance of a day with only rain increases from 13% to 29%, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout.
Probability of Precipitation in October
The average sliding 31-day rainfall during October in Granite Falls is rapidly increasing, starting the month at 0.9 inches, when it rarely exceeds 1.9 inches or falls below 0.1 inches, and ending the month at 2.1 inches, when it rarely exceeds 3.5 inches or falls below 0.6 inches.
Average Monthly Rainfall in October
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during October in Granite Falls is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.5 inches or falling to 0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in October
Over the course of October in Granite Falls, 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, 40 minutes, implying an average daily decrease of 3 minutes, 20 seconds, and weekly decrease of 23 minutes, 17 seconds.
The shortest day of the month is October 31, with 9 hours, 59 minutes of daylight and the longest day is October 1, with 11 hours, 39 minutes of daylight.
Hours of Daylight and Twilight in October
The earliest sunrise of the month in Granite Falls is 7:00 AM on October 1 and the latest sunrise is 44 minutes later at 7:44 AM on October 31.
The latest sunset is 6:39 PM on October 1 and the earliest sunset is 56 minutes earlier at 5:43 PM on October 31.
Daylight saving time is observed in Granite Falls during 2017, but it neither starts nor ends during October, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:01 AM and sets 16 hours, 2 minutes later, at 9:03 PM, while on December 21, the shortest day of the year, it rises at 7:47 AM and sets 8 hours, 23 minutes later, at 4:10 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in October
The chance that a given day will be muggy in Granite Falls is essentially constant during October, remaining around 0% throughout.
Humidity Comfort Levels in October
The average hourly wind speed in Granite Falls is essentially constant during October, remaining within 0.1 miles per hour of 4.3 miles per hour throughout.
For reference, on May 6, the windiest day of the year, the daily average wind speed is 5.1 miles per hour, while on December 21, the calmest day of the year, the daily average wind speed is 3.9 miles per hour.
Average Wind Speed in October
Wind Direction in October
The growing season in Granite Falls typically lasts for 5.9 months (179 days), from around April 22 to around October 18, rarely starting before April 1 or after May 12, and rarely ending before October 1 or after November 4.
During October in Granite Falls, the chance that a given day is within the growing season is very rapidly decreasing falling from 91% to 16% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in October
The average accumulated growing degree days in Granite Falls is gradually increasing during October, increasing by 90°F, from 2,167°F to 2,257°F, over the course of the month.
Growing Degree Days in October
The average daily incident shortwave solar energy in Granite Falls is rapidly decreasing during October, falling by 1.8 kWh, from 3.8 kWh to 2.1 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 Granite Falls are 47.890 deg latitude, -120.214 deg longitude, and 1,873 ft elevation.
The topography within 2 miles of Granite Falls contains large variations in elevation, with a maximum elevation change of 3,035 feet and an average elevation above sea level of 1,860 feet. Within 10 miles contains large variations in elevation (6,444 feet). Within 50 miles also contains extreme variations in elevation (9,938 feet).
The area within 2 miles of Granite Falls is covered by shrubs (38%), water (29%), and sparse vegetation (19%), within 10 miles by shrubs (48%) and sparse vegetation (17%), and within 50 miles by shrubs (43%) and trees (25%).
This report illustrates the typical weather in Granite Falls 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 Granite Falls.
For each station, the records are corrected for the elevation difference between that station and Granite Falls 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 Granite Falls is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Granite Falls and a given station.
The stations contributing to this reconstruction are: Pangborn Field (55%, 55 kilometers, south); Omak Airport (32%, 82 kilometers, northeast); and Arlington Municipal Airport (13%, 148 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .