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the claim

Meteorology defines normal climate periods using standardized 30-year averages.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that meteorology defines normal climate periods using standardized 30-year averages?

Yes. Meteorology standardly defines and evaluates climate normals using 30-year averages, as supported by multiple climate studies and datasets.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

The analysis

The retrieved papers consistently reference and use 30-year periods as the standard baseline for climatological normals across various regional and global studies, supporting the claim without any conflicting evidence.

Evidence for · 4
A global climate model ensemble for downscaled monthly climate normals over North America
2022
The study mentions the widespread use of 30-year normals in climate change impact analyses and model projections.
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Mahony, C. R., Wang, T., Hamann, A., & Cannon, A. J. (2022). A global climate model ensemble for downscaled monthly climate normals over North America. doi.org. https://doi.org/10.1002/joc.7566

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More for · 3
Projecting “Normals” in a Nonstationary Climate
2013
The paper discusses averages of 30 years as established formulations used for estimating climate normals.
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Wilks, D. S. (2013). Projecting “Normals” in a Nonstationary Climate. doi.org. https://doi.org/10.1175/jamc-d-11-0267.1

Southeastern Brazil inland tropicalization: Köppen system applied for detecting climate change throughout 100 years of meteorological observed data.
2022
The historical analysis explicitly utilizes 30-year climatological normal periods (e.g., 1917–1946) to evaluate temperature changes.
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CA, A., PC, S., & HB, D. (2022). Southeastern Brazil inland tropicalization: Köppen system applied for detecting climate change throughout 100 years of meteorological observed data.. doi.org. https://doi.org/10.1007/s00704-022-04122-4

A high-resolution database of historical and future climate for Africa developed with deep neural networks.
2025
The research database incorporates standard 30-year normal climate data spanning the historical record.
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SA, N., A, H., T, W., D, C., & CR, M. (2025). A high-resolution database of historical and future climate for Africa developed with deep neural networks.. doi.org. https://doi.org/10.1038/s41597-025-05575-8

What does the evidence say?

The retrieved papers consistently reference and use 30-year periods as the standard baseline for climatological normals across various regional and global studies, supporting the claim without any conflicting evidence.

Receipt History
first checked05 Aug 2026
judged → SUPPORTED · 8805 Aug 2026
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