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In page Civil defense siren:

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CPG 1-17 recommends that a monthly test be conducted, consisting of the steady attention signal for no more than one minute, one minute of silence, and the attack signal for no more than one minute. A growl test signal is also described by CPG 1–17, when a siren must be tested more than once a month. This is typically a one-second burst of sound to verify the proper operation of the siren without causing a significant number of people to interpret the test as an actual alert. Many cities in the U.S. periodically sound their sirens as a test, either weekly, monthly, or yearly, at a day and hour set by each individual city.[citation needed]