Winter Weather in Tournai BelgiumDaily high temperatures are around 44°F, rarely falling below 31°F or exceeding 55°F. The lowest daily average high temperature is 42°F on January 11. Daily low temperatures are around 36°F, rarely falling below 22°F or exceeding 46°F. The lowest daily average low temperature is 34°F on February 8. For reference, on August 3, the hottest day of the year, temperatures in Tournai typically range from 57°F to 74°F, while on February 8, the coldest day of the year, they range from 34°F to 43°F. The figure below shows you a compact characterization of the hourly average winter temperatures. 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. Vancouver, Canada (4,855 miles away) is the far-away foreign place with temperatures most similar to Tournai (view comparison). CloudsThe winter in Tournai experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 69% to 62%. The highest chance of overcast or mostly cloudy conditions is 72% on December 29. The clearest day of the winter is February 27, with clear, mostly clear, or partly cloudy conditions 39% of the time. For reference, on December 29, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 72%, while on July 21, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 59%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Tournai, the chance of a wet day over the course of the winter is decreasing, starting the season at 30% and ending it at 25%. For reference, the year's highest daily chance of a wet day is 32% on December 21, and its lowest chance is 24% on April 23. Over the course of the winter in Tournai, the chance of a day with only rain decreases from 29% to 24%, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 1% throughout. RainfallTo show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day. The average sliding 31-day rainfall during the winter in Tournai is decreasing, starting the season at 1.9 inches, when it rarely exceeds 3.2 inches or falls below 0.9 inches, and ending the season at 1.4 inches, when it rarely exceeds 2.6 inches or falls below 0.5 inches. The highest average 31-day accumulation is 2.0 inches on December 15. SunOver the course of the winter in Tournai, the length of the day is very rapidly increasing. From the start to the end of the season, the length of the day increases by 2 hours, 36 minutes, implying an average daily increase of 1 minute, 45 seconds, and weekly increase of 12 minutes, 16 seconds. The shortest day of the winter is December 21, with 7 hours, 59 minutes of daylight and the longest day is February 28, with 10 hours, 54 minutes of daylight. The latest sunrise of the winter in Tournai is 8:47 AM on December 31 and the earliest sunrise is 1 hour, 16 minutes earlier at 7:32 AM on February 28. The earliest sunset is 4:41 PM on December 11 and the latest sunset is 1 hour, 45 minutes later at 6:26 PM on February 28. Daylight saving time is observed in Tournai during 2024, but it neither starts nor ends during the winter, so the entire season is in daylight saving time. For reference, on June 20, the longest day of the year, the Sun rises at 5:33 AM and sets 16 hours, 29 minutes later, at 10:02 PM, while on December 21, the shortest day of the year, it rises at 8:45 AM and sets 7 hours, 59 minutes later, at 4:44 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 the winter of 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 Tournai is essentially constant during the winter, remaining around 0% throughout. For reference, on July 23, the muggiest day of the year, there are muggy conditions 3% 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 Tournai is essentially constant during the winter, remaining within 0.7 miles per hour of 12.2 miles per hour throughout. For reference, on January 7, the windiest day of the year, the daily average wind speed is 12.9 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 8.4 miles per hour. The highest daily average wind speed during the winter is 12.9 miles per hour on January 7. The wind direction in Tournai during the winter is predominantly out of the south from December 1 to February 26 and the west from February 26 to February 28. Water TemperatureTournai 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 Tournai is rapidly decreasing during the winter, falling by 7°F, from 50°F to 43°F, over the course of the season. The lowest average surface water temperature during the winter is 43°F on February 24. 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 Tournai typically lasts for 7.4 months (226 days), from around April 3 to around November 14, rarely starting before March 1 or after April 25, and rarely ending before October 20 or after December 12. The winter in Tournai is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season reaching a low of 0% on January 15. 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 Tournai are very rapidly decreasing during the winter, decreasing by 2,020°F, from 2,030°F to 10°F, over the course of the season. 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 Tournai is increasing during the winter, rising by 1.5 kWh, from 0.8 kWh to 2.3 kWh, over the course of the season. The lowest average daily incident shortwave solar energy during the winter is 0.7 kWh on December 25. TopographyFor the purposes of this report, the geographical coordinates of Tournai are 50.607 deg latitude, 3.389 deg longitude, and 75 ft elevation. The topography within 2 miles of Tournai contains only modest variations in elevation, with a maximum elevation change of 246 feet and an average elevation above sea level of 96 feet. Within 10 miles contains only modest variations in elevation (1,066 feet). Within 50 miles also contains very significant variations in elevation (1,499 feet). The area within 2 miles of Tournai is covered by artificial surfaces (58%) and cropland (36%), within 10 miles by cropland (66%) and artificial surfaces (18%), and within 50 miles by cropland (62%) and artificial surfaces (19%). Data SourcesThis report illustrates the typical weather in Tournai, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Tournai. For each station, the records are corrected for the elevation difference between that station and Tournai 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 Tournai is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Tournai 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 Tournai 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. |