1
: the amount of precipitation usually measured by the depth in inches
2
Examples of rainfall in a Sentence
This area has an average annual rainfall of 12 inches.
an increase in annual rainfall
Recent Examples on the Web
Pay attention to frost dates, rainfall, and snow levels to determine when to mulch and how deeply.
—
Mary Marlowe Leverette, Southern Living, 8 Nov. 2025
During periods of intense rainfall, the risk of flooding increases, particularly in low-lying and flood-prone areas.
—Ca Weather Bot, Sacbee.com, 8 Nov. 2025
New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
—Katie Wiseman, Louisville Courier Journal, 7 Nov. 2025
In the 2022-23 season, the rainfall topped off Marin reservoirs and extracted the county from a significant drought.
—Adrian Rodriguez, Mercury News, 7 Nov. 2025
See All Example Sentences for rainfall
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Mary Marlowe Leverette, Southern Living, 8 Nov. 2025
During periods of intense rainfall, the risk of flooding increases, particularly in low-lying and flood-prone areas.
—Ca Weather Bot, Sacbee.com, 8 Nov. 2025
New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
—Katie Wiseman, Louisville Courier Journal, 7 Nov. 2025
In the 2022-23 season, the rainfall topped off Marin reservoirs and extracted the county from a significant drought.
—Adrian Rodriguez, Mercury News, 7 Nov. 2025
See All Example Sentences for rainfall
Cite this Entry
“Rainfall.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rainfall. Accessed 9 Nov. 2025.
Copy CitationKids Definition
rainfall
noun
rain·fall
-ˌfȯl 
1
: a fall of rain
2
: amount of precipitation
an annual rainfall of 20 inches
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