Why the seasonal adjustment in monthly jobs data?

Mar 6, 2020
Smoothing over predictable seasonable ups and downs in unemployment can reveal underlying economic trends.
One BLS economist said unseasonably mild weather would lead to an uptick in construction.
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What seasonally adjusted data does and doesn't mean

Feb 13, 2014
Retail numbers out today don’t look great, sales fell by 0.4 percent in January— when you take into account “seasonal adjustment”.