Average Weather in September in Bonners Ferry Idaho, United States
In Bonners Ferry, the month of September is characterized by rapidly falling daily high temperatures, with daily highs decreasing by 12°F, from 78°F to 66°F over the course of the month, and rarely exceeding 89°F or dropping below 55°F.
Daily low temperatures decrease by 7°F, from 50°F to 43°F, rarely falling below 34°F or exceeding 57°F.
For reference, on August 2, the hottest day of the year, temperatures in Bonners Ferry typically range from 55°F to 85°F, while on December 30, the coldest day of the year, they range from 24°F to 33°F.
Average High and Low Temperature in September
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. 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 September
The month of September in Bonners Ferry experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 35% to 46%.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 65% of the time.
For reference, on January 9, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 77%, while on August 2, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 76%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Bonners Ferry, the chance of a wet day over the course of September is increasing, starting the month at 15% and ending it at 20%.
For reference, the year's highest daily chance of a wet day is 40% on November 20, and its lowest chance is 12% on August 12.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Bonners Ferry is gradually increasing, starting the month at 0.9 inches, when it rarely exceeds 2.0 inches or falls below 0.1 inches, and ending the month at 1.4 inches, when it rarely exceeds 2.7 inches or falls below 0.3 inches.
Average Monthly Rainfall in September
Over the course of September in Bonners Ferry, 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, 42 minutes, implying an average daily decrease of 3 minutes, 31 seconds, and weekly decrease of 24 minutes, 38 seconds.
The shortest day of the month is September 30, with 11 hours, 42 minutes of daylight and the longest day is September 1, with 13 hours, 24 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Bonners Ferry is 6:02 AM on September 1 and the latest sunrise is 41 minutes later at 6:43 AM on September 30.
The latest sunset is 7:26 PM on September 1 and the earliest sunset is 1 hour, 1 minute earlier at 6:25 PM on September 30.
Daylight saving time is observed in Bonners Ferry during 2017, but it neither starts nor ends during September, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 4:42 AM and sets 16 hours, 9 minutes later, at 8:51 PM, while on December 21, the shortest day of the year, it rises at 7:35 AM and sets 8 hours, 16 minutes later, at 3:51 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Bonners Ferry is essentially constant during September, remaining around 0% throughout.
For reference, on July 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 September
The average hourly wind speed in Bonners Ferry is essentially constant during September, remaining around 3.8 miles per hour throughout.
For reference, on May 6, the windiest day of the year, the daily average wind speed is 4.1 miles per hour, while on August 2, the calmest day of the year, the daily average wind speed is 3.6 miles per hour.
The highest daily average wind speed during September is 3.8 miles per hour on September 18.
Average Wind Speed in September
Wind Direction in September
The average daily incident shortwave solar energy in Bonners Ferry is rapidly decreasing during September, falling by 1.7 kWh, from 5.4 kWh to 3.7 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Bonners Ferry are 48.691 deg latitude, -116.316 deg longitude, and 1,903 ft elevation.
The topography within 2 miles of Bonners Ferry contains significant variations in elevation, with a maximum elevation change of 587 feet and an average elevation above sea level of 1,945 feet. Within 10 miles contains significant variations in elevation (5,197 feet). Within 50 miles also contains extreme variations in elevation (6,929 feet).
The area within 2 miles of Bonners Ferry is covered by sparse vegetation (47%), shrubs (23%), and cropland (12%), within 10 miles by trees (46%) and shrubs (24%), and within 50 miles by trees (72%) and shrubs (15%).
This report illustrates the typical weather in Bonners Ferry 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 Bonners Ferry.
For each station, the records are corrected for the elevation difference between that station and Bonners Ferry 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 Bonners Ferry is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Bonners Ferry and a given station.
The stations contributing to this reconstruction are: Creston Automatic Weather Reporting System (48%, 46 kilometers, north); Sandpoint Airport (45%, 47 kilometers, south); and Glacier Park International Airport (7%, 157 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .