These words are basically arbitrary stabs at what is going on. A comparison trigger like this is going to fire on every temperature report. Do not read more into the word "becomes". If you want to only trigger something when the temperature becomes 80 but not 81, then why not just use temp = 80, instead of temp >= 80? That will trigger every time the temperature becomes 80. temp >= 80 will trigger every time the temperature is greater than or equal to 80. Each one is going to take a look on every temperature report.
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