Average Weather in Bonners Ferry Idaho, United States
In Bonners Ferry, the summers are short, warm, dry, and partly cloudy and the winters are freezing and overcast. Over the course of the year, the temperature typically varies from 24°F to 85°F and is rarely below 8°F or above 94°F.
Based on the tourism score, the best time of year to visit Bonners Ferry for warm-weather activities is from mid July to mid August.
The hot season lasts for 2.7 months, from June 18 to September 10, with an average daily high temperature above 75°F. The hottest day of the year is August 2, with an average high of 85°F and low of 55°F.
The cold season lasts for 3.6 months, from November 11 to February 28, with an average daily high temperature below 43°F. The coldest day of the year is December 30, with an average low of 24°F and high of 33°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, 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 Bonners Ferry, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.
The clearer part of the year in Bonners Ferry begins around June 11 and lasts for 4.0 months, ending around October 9. On August 2, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 76% of the time, and overcast or mostly cloudy 24% of the time.
The cloudier part of the year begins around October 9 and lasts for 8.0 months, ending around June 11. On January 9, the cloudiest day of the year, the sky is overcast or mostly cloudy 77% of the time, and clear, mostly clear, or partly cloudy 23% of the time.
Cloud Cover Categories
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. The chance of wet days in Bonners Ferry varies throughout the year.
The wetter season lasts 8.3 months, from October 16 to June 25, with a greater than 26% chance of a given day being a wet day. The chance of a wet day peaks at 40% on November 20.
The drier season lasts 3.7 months, from June 25 to October 16. The smallest chance of a wet day is 12% on August 12.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 35% on November 10.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Bonners Ferry experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Bonners Ferry. The most rain falls during the 31 days centered around November 19, with an average total accumulation of 3.2 inches.
The least rain falls around August 5, with an average total accumulation of 0.7 inches.
Average Monthly Rainfall
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. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Bonners Ferry experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 4.8 months, from October 31 to March 25, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 29, with an average total liquid-equivalent accumulation of 0.8 inches.
The snowless period of the year lasts for 7.2 months, from March 25 to October 31. The least snow falls around July 31, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Bonners Ferry varies extremely over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 16 minutes of daylight; the longest day is June 21, with 16 hours, 9 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 4:41 AM on June 16, and the latest sunrise is 2 hours, 56 minutes later at 7:38 AM on December 31. The earliest sunset is at 3:49 PM on December 10, and the latest sunset is 5 hours, 3 minutes later at 8:52 PM on June 25.
Daylight saving time (DST) is observed in Bonners Ferry during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
The perceived humidity level in Bonners Ferry, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
Average Wind Speed
The predominant average hourly wind direction in Bonners Ferry varies throughout the year.
The wind is most often from the west for 7.7 months, from March 15 to November 7 and for 6.0 days, from December 6 to December 12, with a peak percentage of 45% on October 4. The wind is most often from the south for 4.1 weeks, from November 7 to December 6, with a peak percentage of 36% on November 8. The wind is most often from the east for 3.1 months, from December 12 to March 15, with a peak percentage of 34% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Bonners Ferry throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Bonners Ferry for general outdoor tourist activities is from mid July to mid August, with a peak score in the last week of July.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Bonners Ferry for hot-weather activities is from mid July to mid August, with a peak score in the first week of August.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
The growing season in Bonners Ferry typically lasts for 5.5 months (167 days), from around April 26 to around October 10, rarely starting before April 1 or after May 17, and rarely ending before September 19 or after October 29.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Bonners Ferry should appear around May 1, only rarely appearing before April 20 or after May 15.
Growing Degree Days
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.2 months, from May 14 to August 20, with an average daily incident shortwave energy per square meter above 6.1 kWh. The brightest day of the year is July 15, with an average of 7.4 kWh.
The darker period of the year lasts for 3.8 months, from October 24 to February 18, with an average daily incident shortwave energy per square meter below 2.2 kWh. The darkest day of the year is December 24, with an average of 0.9 kWh.
Average Daily Incident Shortwave Solar Energy
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, 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 2 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: Boundary County Airport (87%, 4.2 kilometers, north) and Sandpoint Airport (13%, 47 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .