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In this report, we use a base of This 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 thin dotted line is the corresponding average liquid-equivalent snowfall. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen.Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body.
From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight.
The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.
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 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.
Our Definitions 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).