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Local Temperatures should be declining most rapidly during this time of year, according to more than a century of local meteorological records. With every successive week, daily maximum temperatures are declining by about 3/4° Fahrenheit, and daily minimum temperatures are plummeting by about 1° Fahrenheit. (This gradual onset of fall/winter chill is probably all but unnoticed by most newcomers from harsher climates.) By January, our mean temperature will have fallen to about 55°, from an average temperature of about 70° in August.
Atmospheric Ice-Crystal Effects are often noticed, starting about this time of year, because of the frequent presence of high clouds made of tiny bits of ice. The most familiar of these optical effects is the 22°-radius halo, or ring, around the sun or the moon. Less often seen is a "corona" (a colored disk around the sun or moon -- not the same as the solar corona seen during total eclipse); "sundogs" (colored arcs left and right of the sun); the sun pillar (a vertical column of light above the rising or setting sun); and a host of other rare and inconspicuous optical phenomena. All of these optical effects are a consequence of sunlight or moonlight refracting through or reflecting from the tiny facets of ice crystals in cirrus and other types of high clouds.
Local Temperatures should be declining most rapidly during this time of year, according to more than a century of local meteorological records. With every successive week, daily maximum temperatures are declining by about 3/4° Fahrenheit, and daily minimum temperatures are plummeting by about 1° Fahrenheit. (This gradual onset of fall/winter chill is probably all but unnoticed by most newcomers from harsher climates.) By January, our mean temperature will have fallen to about 55°, from an average temperature of about 70° in August.
Atmospheric Ice-Crystal Effects are often noticed, starting about this time of year, because of the frequent presence of high clouds made of tiny bits of ice. The most familiar of these optical effects is the 22°-radius halo, or ring, around the sun or the moon. Less often seen is a "corona" (a colored disk around the sun or moon -- not the same as the solar corona seen during total eclipse); "sundogs" (colored arcs left and right of the sun); the sun pillar (a vertical column of light above the rising or setting sun); and a host of other rare and inconspicuous optical phenomena. All of these optical effects are a consequence of sunlight or moonlight refracting through or reflecting from the tiny facets of ice crystals in cirrus and other types of high clouds.