December Weather in Powassan CanadaDaily high temperatures decrease by 9°F, from 31°F to 22°F, rarely falling below 6°F or exceeding 44°F. Daily low temperatures decrease by 12°F, from 18°F to 7°F, rarely falling below -14°F or exceeding 33°F. For reference, on July 18, the hottest day of the year, temperatures in Powassan typically range from 57°F to 75°F, while on January 29, the coldest day of the year, they range from 2°F to 20°F. 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. Ulyanovsk, Russia (4,863 miles away) is the far-away foreign place with temperatures most similar to Powassan (view comparison). CloudsThe month of December in Powassan experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 71% to 79%. The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 29% of the time. For reference, on January 11, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 80%, while on August 6, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 63%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Powassan, the chance of a wet day over the course of December is gradually decreasing, starting the month at 25% and ending it at 22%. For reference, the year's highest daily chance of a wet day is 36% on October 5, and its lowest chance is 17% on February 4. Over the course of December in Powassan, the chance of a day with only rain decreases from 10% to 3%, the chance of a day with mixed snow and rain remains an essentially constant 4% throughout, and the chance of a day with only snow increases from 12% to 15%. RainfallTo 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 December in Powassan is gradually decreasing, starting the month at 0.9 inches, when it rarely exceeds 1.9 inches or falls below 0.2 inches, and ending the month at 0.4 inches, when it rarely exceeds 1.0 inches. SnowfallAs with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day snowfall during December in Powassan is increasing, starting the month at 6.8 inches, when it rarely exceeds 14.5 inches or falls below 1.0 inches, and ending the month at 8.0 inches, when it rarely exceeds 16.0 inches or falls below 2.3 inches. The highest average 31-day accumulation is 8.1 inches on December 24. SunOver the course of December in Powassan, the length of the day is essentially constant. The shortest day of the month is December 21, with 8 hours, 38 minutes of daylight and the longest day is December 1, with 8 hours, 54 minutes of daylight. The earliest sunrise of the month in Powassan is 7:39 AM on December 1 and the latest sunrise is 20 minutes later at 7:59 AM on December 31. The earliest sunset is 4:31 PM on December 10 and the latest sunset is 10 minutes later at 4:42 PM on December 31. Daylight saving time is observed in Powassan during 2024, but it neither starts nor ends during December, so the entire month is in daylight saving time. For reference, on June 20, the longest day of the year, the Sun rises at 5:26 AM and sets 15 hours, 46 minutes later, at 9:11 PM, while on December 21, the shortest day of the year, it rises at 7:56 AM and sets 8 hours, 38 minutes later, at 4:34 PM. The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation. MoonThe figure below presents a compact representation of key lunar data for December 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
HumidityWe 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 Powassan is essentially constant during December, remaining around 0% throughout. For reference, on July 19, the muggiest day of the year, there are muggy conditions 14% of the time, while on October 29, the least muggy day of the year, there are muggy conditions 0% of the time. WindThis 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 Powassan is gradually increasing during December, increasing from 6.0 miles per hour to 6.5 miles per hour over the course of the month. For reference, on February 27, the windiest day of the year, the daily average wind speed is 7.2 miles per hour, while on July 29, the calmest day of the year, the daily average wind speed is 4.2 miles per hour. The wind direction in Powassan during December is predominantly out of the south from December 1 to December 8 and the west from December 8 to December 31. Water TemperaturePowassan is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water. The average surface water temperature in Powassan is decreasing during December, falling by 5°F, from 41°F to 36°F, over the course of the month. Growing SeasonDefinitions 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 Powassan typically lasts for 4.5 months (137 days), from around May 13 to around September 27, rarely starting before April 25 or after May 31, and rarely ending before September 10 or after October 14. The month of December in Powassan is reliably fully outside of the growing season. 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 Powassan are essentially constant during December, remaining around 1,829°F throughout. Solar EnergyThis 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 Powassan is essentially constant during December, remaining within 0.1 kWh of 1.1 kWh throughout. The lowest average daily incident shortwave solar energy during December is 1.0 kWh on December 23. TopographyFor the purposes of this report, the geographical coordinates of Powassan are 46.033 deg latitude, -79.350 deg longitude, and 1,050 ft elevation. The topography within 2 miles of Powassan contains significant variations in elevation, with a maximum elevation change of 627 feet and an average elevation above sea level of 1,059 feet. Within 10 miles contains significant variations in elevation (981 feet). Within 50 miles also contains very significant variations in elevation (1,342 feet). The area within 2 miles of Powassan is covered by trees (94%), within 10 miles by trees (94%), and within 50 miles by trees (90%). Data SourcesThis report illustrates the typical weather in Powassan, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointThere are 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Powassan. For each station, the records are corrected for the elevation difference between that station and Powassan 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 Powassan is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Powassan and a given station. The stations contributing to this reconstruction are:
To get a sense of how much these sources agree with each other, you can view a comparison of Powassan and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data. Other DataAll data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com . Maps are © OpenStreetMap contributors. DisclaimerThe 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. Please review our full terms contained on our Terms of Service page. |