December Weather in Gdańsk PolandDaily high temperatures decrease by 4°F, from 40°F to 36°F, rarely falling below 26°F or exceeding 48°F. Daily low temperatures decrease by 4°F, from 32°F to 28°F, rarely falling below 13°F or exceeding 41°F. For reference, on July 26, the hottest day of the year, temperatures in Gdańsk typically range from 56°F to 73°F, while on February 2, the coldest day of the year, they range from 26°F to 35°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. Kitimat, Canada (4,723 miles away) is the far-away foreign place with temperatures most similar to Gdańsk (view comparison). CloudsThe month of December in Gdańsk experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 68% throughout the month. The clearest day of the month is December 21, with clear, mostly clear, or partly cloudy conditions 33% of the time. For reference, on November 26, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 70%, while on July 16, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 58%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Gdańsk, the chance of a wet day over the course of December is essentially constant, remaining around 25% throughout. For reference, the year's highest daily chance of a wet day is 30% on July 5, and its lowest chance is 17% on April 23. Over the course of December in Gdańsk, the chance of a day with only rain decreases from 23% to 18%, the chance of a day with mixed snow and rain remains an essentially constant 3% throughout, and the chance of a day with only snow increases from 1% to 4%. 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 Gdańsk is gradually decreasing, starting the month at 1.3 inches, when it rarely exceeds 2.1 inches or falls below 0.4 inches, and ending the month at 0.9 inches, when it rarely exceeds 1.7 inches or falls below 0.2 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 Gdańsk is gradually increasing, starting the month at 1.3 inches, when it rarely exceeds 3.2 inches or falls below -0.0 inches, and ending the month at 2.2 inches, when it rarely exceeds 6.1 inches or falls below -0.0 inches. SunOver the course of December in Gdańsk, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 18 minutes, implying an average daily decrease of 35 seconds, and weekly decrease of 4 minutes, 6 seconds. The shortest day of the month is December 21, with 7 hours, 18 minutes of daylight and the longest day is December 1, with 7 hours, 42 minutes of daylight. The earliest sunrise of the month in Gdańsk is 7:43 AM on December 1 and the latest sunrise is 23 minutes later at 8:06 AM on December 29. The earliest sunset is 3:20 PM on December 13 and the latest sunset is 10 minutes later at 3:30 PM on December 31. Daylight saving time is observed in Gdańsk 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 4:10 AM and sets 17 hours, 14 minutes later, at 9:23 PM, while on December 21, the shortest day of the year, it rises at 8:04 AM and sets 7 hours, 18 minutes later, at 3:22 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 Gdańsk is essentially constant during December, remaining around 0% throughout. For reference, on July 27, the muggiest day of the year, there are muggy conditions 6% of the time, while on January 1, 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 Gdańsk is gradually increasing during December, increasing from 14.1 miles per hour to 14.8 miles per hour over the course of the month. For reference, on January 24, the windiest day of the year, the daily average wind speed is 15.3 miles per hour, while on May 23, the calmest day of the year, the daily average wind speed is 9.9 miles per hour. The hourly average wind direction in Gdańsk throughout December is predominantly from the west, with a peak proportion of 46% on December 31. Water TemperatureGdańsk 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 Gdańsk is decreasing during December, falling by 4°F, from 44°F to 40°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 Gdańsk typically lasts for 6.1 months (185 days), from around April 22 to around October 24, rarely starting before April 5 or after May 9, and rarely ending before October 7 or after November 13. The month of December in Gdańsk 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 Gdańsk are essentially constant during December, remaining around 1,732°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 Gdańsk is essentially constant during December, remaining around 0.5 kWh throughout. The lowest average daily incident shortwave solar energy during December is 0.4 kWh on December 23. TopographyFor the purposes of this report, the geographical coordinates of Gdańsk are 54.352 deg latitude, 18.646 deg longitude, and 23 ft elevation. The topography within 2 miles of Gdańsk contains only modest variations in elevation, with a maximum elevation change of 302 feet and an average elevation above sea level of 59 feet. Within 10 miles contains only modest variations in elevation (630 feet). Within 50 miles contains significant variations in elevation (1,112 feet). The area within 2 miles of Gdańsk is covered by artificial surfaces (85%), within 10 miles by cropland (40%) and water (26%), and within 50 miles by cropland (36%) and water (34%). Data SourcesThis report illustrates the typical weather in Gdańsk, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Gdańsk. For each station, the records are corrected for the elevation difference between that station and Gdańsk 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 Gdańsk is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Gdańsk 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 Gdańsk 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. |