April Weather in Sihaidian ChinaDaily high temperatures increase by 17°F, from 42°F to 60°F, rarely falling below 30°F or exceeding 72°F. Daily low temperatures increase by 14°F, from 22°F to 36°F, rarely falling below 12°F or exceeding 44°F. For reference, on July 18, the hottest day of the year, temperatures in Sihaidian typically range from 61°F to 81°F, while on January 17, the coldest day of the year, they range from -17°F to 2°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. 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. High Level, Canada (4,253 miles away); Nipawin, Canada (4,849 miles); and Red Lake, Canada (5,209 miles) are the far-away foreign places with temperatures most similar to Sihaidian (view comparison). CloudsThe month of April in Sihaidian experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 50% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 48% on April 2. The clearest day of the month is April 2, with clear, mostly clear, or partly cloudy conditions 52% of the time. For reference, on December 23, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on September 5, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 62%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Sihaidian, the chance of a wet day over the course of April is very rapidly increasing, starting the month at 8% and ending it at 19%. For reference, the year's highest daily chance of a wet day is 45% on July 15, and its lowest chance is 1% on January 14. Over the course of April in Sihaidian, the chance of a day with only rain increases from 5% to 19%, 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 decreases from 2% to 0%. 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 April in Sihaidian is increasing, starting the month at 0.3 inches, when it rarely exceeds 0.6 inches, and ending the month at 1.1 inches, when it rarely exceeds 2.0 inches or falls below 0.4 inches. SunOver the course of April in Sihaidian, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 35 minutes, implying an average daily increase of 3 minutes, 16 seconds, and weekly increase of 22 minutes, 50 seconds. The shortest day of the month is April 1, with 12 hours, 51 minutes of daylight and the longest day is April 30, with 14 hours, 26 minutes of daylight. The latest sunrise of the month in Sihaidian is 5:08 AM on April 1 and the earliest sunrise is 54 minutes earlier at 4:14 AM on April 30. The earliest sunset is 5:59 PM on April 1 and the latest sunset is 41 minutes later at 6:40 PM on April 30. Daylight saving time is not observed in Sihaidian during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 3:32 AM and sets 15 hours, 58 minutes later, at 7:30 PM, while on December 21, the shortest day of the year, it rises at 7:14 AM and sets 8 hours, 27 minutes later, at 3:41 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 April 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 Sihaidian is essentially constant during April, remaining around 0% throughout. For reference, on July 30, the muggiest day of the year, there are muggy conditions 29% 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 Sihaidian is essentially constant during April, remaining within 0.2 miles per hour of 8.7 miles per hour throughout. For reference, on April 15, the windiest day of the year, the daily average wind speed is 8.9 miles per hour, while on July 17, the calmest day of the year, the daily average wind speed is 5.5 miles per hour. The highest daily average wind speed during April is 8.9 miles per hour on April 16. The wind direction in Sihaidian during April is predominantly out of the north from April 1 to April 12, the west from April 12 to April 24, and the south from April 24 to April 30. 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 Sihaidian typically lasts for 4.6 months (142 days), from around May 7 to around September 25, rarely starting before April 22 or after May 21, and rarely ending before September 11 or after October 10. The month of April in Sihaidian is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season rapidly increasing from 0% to 29% over the course of the month. 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 Sihaidian are gradually increasing during April, increasing by 46°F, from 3°F to 49°F, over the course of the month. 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 Sihaidian is gradually increasing during April, rising by 0.9 kWh, from 4.6 kWh to 5.4 kWh, over the course of the month. TopographyFor the purposes of this report, the geographical coordinates of Sihaidian are 47.474 deg latitude, 127.506 deg longitude, and 843 ft elevation. The topography within 2 miles of Sihaidian contains only modest variations in elevation, with a maximum elevation change of 197 feet and an average elevation above sea level of 810 feet. Within 10 miles also contains only modest variations in elevation (440 feet). Within 50 miles contains only modest variations in elevation (2,733 feet). The area within 2 miles of Sihaidian is covered by trees (46%) and cropland (39%), within 10 miles by cropland (55%) and trees (40%), and within 50 miles by trees (48%) and cropland (44%). Data SourcesThis report illustrates the typical weather in Sihaidian, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Sihaidian is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . 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. The temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Sihaidian, according to the International Standard Atmosphere . All 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. 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. 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