The phrase "rainfall drops" is correct and usable in written English.
You can use this phrase to describe the sound of rain, as in "the gentle lull of rainfall drops pattering against the window pane."
Due to global-scale wind patterns, to the west of this longitude, rainfall drops off sharply.
In Upper Guinea rainfall drops to about 60 inches (1,500 mm) a year.
The most important divergence point occurs when rainfall drops below the critical desertification level.
Farther west, where rainfall drops below 17 inches (430 mm) in Texas and 15 inches (380 mm) in Alberta, vegetation is less luxuriant, and midgrass and shortgrass prairies are typical.
If I didn't have car insurance and I had a major accident, it would be much costlier and I could spend the rest of my life trying to pay it back". Under the insurance policy, the food agency will receive a payoff if rainfall drops so low that 17 million subsistence farmers lose the equivalent of $55 million in income.
Change comes slowly closer to the 100th meridian, the line of longitude bisecting East from West, where the average annual rainfall drops to less than 20 inches, acreage is measured in the thousands and the big city can be a day's drive away.
As rainfall dropped, Carlo Almarcha, 51, switched to growing almonds.
In Oregon and Florida, however, the incidence of extreme rainfall dropped slightly, though in Florida the drop was not statistically significant.
Conversely, the period of the least amount of rainfall and the lightest winds is during the southwest monsoon (May September), with rainfall dropping to a monthly low of less than 7 inches in July.
Under peak flow conditions, conductivity, in coincidence with rainfall, dropped sometimes sharply within minutes.
He found that air temperature and rainfall dropped precipitously when farmers outside the city of Nanjing burned their crop waste en masse, forming a wall of sooty smoke that blotted out the sun in June 2012.
