Average Weather in December in Armstrong Canada
Daily high temperatures decrease by 5°F, from 35°F to 30°F, rarely falling below 17°F or exceeding 44°F.
Daily low temperatures decrease by 5°F, from 26°F to 21°F, rarely falling below 4°F or exceeding 35°F.
For reference, on August 4, the hottest day of the year, temperatures in Armstrong typically range from 57°F to 84°F, while on January 1, the coldest day of the year, they range from 21°F to 30°F.
Average High and Low Temperature in December
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. 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 December
The month of December in Armstrong experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 70% throughout the month.
The clearest day of the month is December 6, with clear, mostly clear, or partly cloudy conditions 32% of the time.
For reference, on January 9, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 73%, while on August 1, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 70%.
Cloud Cover Categories in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Armstrong, the chance of a wet day over the course of December is gradually decreasing, starting the month at 30% and ending it at 27%.
For reference, the year's highest daily chance of a wet day is 33% on November 10, and its lowest chance is 14% on August 10.
Over the course of December in Armstrong, the chance of a day with only rain decreases from 18% to 7%, the chance of a day with mixed snow and rain remains an essentially constant 6% throughout, and the chance of a day with only snow increases from 7% to 13%.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Armstrong is decreasing, starting the month at 1.1 inches, when it rarely exceeds 1.9 inches or falls below 0.3 inches, and ending the month at 0.5 inches, when it rarely exceeds 1.1 inches or falls below 0.1 inches.
Average Monthly Rainfall in December
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 December in Armstrong is gradually increasing, starting the month at 0.5 inches, when it rarely exceeds 1.1 inches, and ending the month at 0.8 inches, when it rarely exceeds 1.7 inches or falls below 0.2 inches.
Average Monthly Liquid-Equivalent Snowfall in December
Over the course of December in Armstrong, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 15 minutes, implying an average daily decrease of 30 seconds, and weekly decrease of 3 minutes, 31 seconds.
The shortest day of the month is December 21, with 8 hours, 0 minutes of daylight and the longest day is December 1, with 8 hours, 20 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Armstrong is 7:35 AM on December 1 and the latest sunrise is 22 minutes later at 7:57 AM on December 31.
The earliest sunset is 3:52 PM on December 12 and the latest sunset is 10 minutes later at 4:02 PM on December 31.
Daylight saving time is observed in Armstrong during 2018, but it neither starts nor ends during December, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 4:45 AM and sets 16 hours, 27 minutes later, at 9:12 PM, while on December 21, the shortest day of the year, it rises at 7:54 AM and sets 8 hours, 0 minutes later, at 3:55 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Armstrong is essentially constant during December, remaining around 0% throughout.
For reference, on July 27, the muggiest day of the year, there are muggy conditions 1% of the time, while on September 22, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in December
The average hourly wind speed in Armstrong is essentially constant during December, remaining within 0.1 miles per hour of 3.4 miles per hour throughout.
For reference, on April 1, the windiest day of the year, the daily average wind speed is 3.5 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 2.9 miles per hour.
Average Wind Speed in December
Wind Direction in December
The growing season in Armstrong typically lasts for 5.6 months (171 days), from around April 24 to around October 12, rarely starting before April 3 or after May 14, and rarely ending before September 23 or after October 30.
The month of December in Armstrong is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Armstrong are essentially constant during December, remaining around 2,034°F throughout.
Growing Degree Days in December
The average daily incident shortwave solar energy in Armstrong is essentially constant during December, remaining within 0.1 kWh of 0.9 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 0.8 kWh on December 23.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Armstrong are 50.450 deg latitude, -119.202 deg longitude, and 1,342 ft elevation.
The topography within 2 miles of Armstrong contains very significant variations in elevation, with a maximum elevation change of 1,158 feet and an average elevation above sea level of 1,314 feet. Within 10 miles contains very significant variations in elevation (5,066 feet). Within 50 miles also contains extreme variations in elevation (8,553 feet).
The area within 2 miles of Armstrong is covered by sparse vegetation (42%), grassland (23%), cropland (11%), and trees (11%), within 10 miles by trees (56%) and sparse vegetation (18%), and within 50 miles by trees (71%) and sparse vegetation (13%).
This report illustrates the typical weather in Armstrong 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 Armstrong.
For each station, the records are corrected for the elevation difference between that station and Armstrong 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 Armstrong is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Armstrong and a given station.
The stations contributing to this reconstruction are: Vernon, B. C. (49%, 26 kilometers, south); Salmon Arm Automatic Weather Reporting System (44%, 28 kilometers, north); and Nakusp Automatic Weather Reporting System (7%, 100 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .