February Weather in Changmaoling ChinaDaily high temperatures increase by 6°F, from 46°F to 52°F, rarely falling below 35°F or exceeding 65°F. Daily low temperatures increase by 6°F, from 36°F to 41°F, rarely falling below 28°F or exceeding 50°F. For reference, on July 22, the hottest day of the year, temperatures in Changmaoling typically range from 79°F to 91°F, while on January 19, the coldest day of the year, they range from 34°F to 44°F. The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on February. 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. Memphis, United States (7,808 miles away) and Tehran, Iran (3,499 miles) are the far-away foreign places with temperatures most similar to Changmaoling (view comparison). CloudsThe month of February in Changmaoling experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 37% to 46%. The clearest day of the month is February 1, with clear, mostly clear, or partly cloudy conditions 63% of the time. For reference, on July 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 73%, while on December 16, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 70%. PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Changmaoling, the chance of a wet day over the course of February is very rapidly increasing, starting the month at 20% and ending it at 30%. For reference, the year's highest daily chance of a wet day is 44% on April 19, and its lowest chance is 13% on December 17. Over the course of February in Changmaoling, the chance of a day with only rain increases from 15% to 28%, 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 remains an essentially constant 1% throughout. 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 February in Changmaoling is rapidly increasing, starting the month at 1.4 inches, when it rarely exceeds 2.7 inches or falls below 0.3 inches, and ending the month at 2.7 inches, when it rarely exceeds 4.5 inches or falls below 0.9 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 February in Changmaoling is decreasing, starting the month at 2.2 inches, when it rarely exceeds 6.9 inches, and ending the month at 1.2 inches, when it rarely exceeds 3.7 inches. SunOver the course of February in Changmaoling, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 44 minutes, implying an average daily increase of 1 minute, 33 seconds, and weekly increase of 10 minutes, 53 seconds. The shortest day of the month is February 1, with 10 hours, 50 minutes of daylight and the longest day is February 29, with 11 hours, 33 minutes of daylight. The latest sunrise of the month in Changmaoling is 7:22 AM on February 1 and the earliest sunrise is 23 minutes earlier at 6:59 AM on February 29. The earliest sunset is 6:11 PM on February 1 and the latest sunset is 21 minutes later at 6:32 PM on February 29. Daylight saving time is not observed in Changmaoling during 2024. For reference, on June 20, the longest day of the year, the Sun rises at 5:35 AM and sets 13 hours, 59 minutes later, at 7:34 PM, while on December 21, the shortest day of the year, it rises at 7:22 AM and sets 10 hours, 18 minutes later, at 5:40 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 February 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 Changmaoling is essentially constant during February, remaining around 0% throughout. For reference, on July 19, the muggiest day of the year, there are muggy conditions 100% of the time, while on December 11, 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 Changmaoling is gradually increasing during February, increasing from 6.9 miles per hour to 7.4 miles per hour over the course of the month. For reference, on March 8, the windiest day of the year, the daily average wind speed is 7.6 miles per hour, while on June 10, the calmest day of the year, the daily average wind speed is 6.1 miles per hour. The hourly average wind direction in Changmaoling throughout February is predominantly from the north, with a peak proportion of 58% on February 4. 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 Changmaoling typically lasts for 9.8 months (297 days), from around February 20 to around December 13, rarely starting before January 27 or after March 13, and rarely ending before November 21 or after January 1. The month of February in Changmaoling is very likely fully outside of the growing season, with the chance that a given day is in the growing season very rapidly increasing from 16% to 68% 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 Changmaoling are gradually increasing during February, increasing by 38°F, from 14°F to 52°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 Changmaoling is essentially constant during February, remaining within 0.2 kWh of 3.4 kWh throughout. TopographyFor the purposes of this report, the geographical coordinates of Changmaoling are 28.786 deg latitude, 111.603 deg longitude, and 243 ft elevation. The topography within 2 miles of Changmaoling contains only modest variations in elevation, with a maximum elevation change of 262 feet and an average elevation above sea level of 248 feet. Within 10 miles contains only modest variations in elevation (1,345 feet). Within 50 miles contains very significant variations in elevation (5,351 feet). The area within 2 miles of Changmaoling is covered by trees (50%), cropland (32%), and shrubs (18%), within 10 miles by trees (55%) and cropland (21%), and within 50 miles by trees (56%) and cropland (24%). Data SourcesThis report illustrates the typical weather in Changmaoling, 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 is only a single weather station, Changsha Datuopu Air Force Base, in our network suitable to be used as a proxy for the historical temperature and dew point records of Changmaoling. At a distance of 159 kilometers from Changmaoling, further than our threshold of 150 kilometers, this station is deemed insufficiently nearby to be relied upon as our primary source for temperature and dew point records. Consequently, the station records are blended with interpolated values from NASA's MERRA-2 satellite-era reanalysis , and both are corrected for elevation differences according to the International Standard Atmosphere . The weight assigned to the MERRA-2 value depends on the distance from Changmaoling to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. In this case, the MERRA-2 weight is 15%, making the weight assigned to the weather station 85%. 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. 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