Length of record: Difference between revisions
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<div class="definition"><div class="short_definition">The period during which observations have been maintained at a [[meteorological station]], and which serves as the frame of reference for climatic data at that station.</div><br/> <div class="paragraph">The standard length of record for the purpose of a [[normal]] has been fixed by the World Meteorological Organization as 30 years (i.e., three consecutive 10-year periods), which is a reasonable average for the length of a homogeneous record desirable for most of the meteorological elements. Homogeneous records as long as 50 years are rare due to breaks or gradual changes being introduced by changes in the hours of [[observation]], in the observational practices, in the [[site]] or instruments used, or by a gradual change in the character of the surrounding country, such as the growth of a city. It is often possible, however, to account for these changes and to construct a composite record that may cover a century or more.</div><br/> </div> | <div class="definition"><div class="short_definition">The period during which observations have been maintained at a [[meteorological station|meteorological station]], and which serves as the frame of reference for climatic data at that station.</div><br/> <div class="paragraph">The standard length of record for the purpose of a [[normal]] has been fixed by the World Meteorological Organization as 30 years (i.e., three consecutive 10-year periods), which is a reasonable average for the length of a homogeneous record desirable for most of the meteorological elements. Homogeneous records as long as 50 years are rare due to breaks or gradual changes being introduced by changes in the hours of [[observation]], in the observational practices, in the [[site]] or instruments used, or by a gradual change in the character of the surrounding country, such as the growth of a city. It is often possible, however, to account for these changes and to construct a composite record that may cover a century or more.</div><br/> </div> | ||
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Latest revision as of 17:19, 25 April 2012
length of record
The period during which observations have been maintained at a meteorological station, and which serves as the frame of reference for climatic data at that station.
The standard length of record for the purpose of a normal has been fixed by the World Meteorological Organization as 30 years (i.e., three consecutive 10-year periods), which is a reasonable average for the length of a homogeneous record desirable for most of the meteorological elements. Homogeneous records as long as 50 years are rare due to breaks or gradual changes being introduced by changes in the hours of observation, in the observational practices, in the site or instruments used, or by a gradual change in the character of the surrounding country, such as the growth of a city. It is often possible, however, to account for these changes and to construct a composite record that may cover a century or more.
