TeachMeFinance.com - explain Normal
Normal The term 'Normal' as it applies to the area of the weather can be defined as ' The long-term average value of a meteorological paramater (i.e., temperature, humidity, etc.) for a certain area. For example, 'temperatures are normal for this time of year' means that temperatures are at or near the average climatological value for the given date. Normals are usually taken from data averaged over a 30-year period (e.g., 1971-2000 average), and are concerned with the distribution of data within limits of common occurrence'.
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