fluctuate
v.v. to change between different levels or amounts over a short period of time. You use this to describe things like prices, weather, or your mood.
v. to vary between different levels or states over a short period of time. Often describes economic indicators, weather patterns, or physiological processes.
The price of gas fluctuates depending on the season.
The stock market fluctuates daily, making it difficult for investors to predict their returns with certainty.
While the overall trend shows a steady increase in global temperatures, local weather patterns continue to fluctuate significantly from year to year due to complex oceanic currents.
First attested in the 1630'; borrowed from Latin flūctuātus, perfect passive participle of flūctuō (“(of the sea) to surge, swell; (of man) to waver, fluctuate”), see -ate (verb-forming suffix) and -ate (adjective-forming suffix).