relative to the 30-year average vs relative to the 30 years average

The correct phrase is 'relative to the 30-year average.' The phrase 'relative to the 30 years average' is incorrect because '30-year' is a compound adjective that describes 'average.'

Last updated: March 17, 2024 • 446 views

relative to the 30-year average

This phrase is correct and commonly used in English.

This phrase is used to compare something to the average over a period of 30 years.

Show examples from the web [+]

accumulated precipitation (in inches) at its location relative to the 30 year average. Filled circle. A, overlaid on a tan background, denotes periods when the ...
The lower maps show how different the 1993 precipitation total was relative to the 30-year average for each cell. The lower left map shows this information in ...
basin during 2001–2010, relative to the 30 year average between 1961 and 1990; changes in temperature and precipitation in wet year (Figures 2c and 2d) and ...
Sep 10, 2015 ... in the previous month, relative to the 30-year average. This is the value in 2010 dollars, deflated by the price deflator for construction, ...

relative to the 30 years average

This phrase is incorrect in English.

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relative to the 30-year average vs relative to the 30 years average