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GB/T 33670-2026Assessment method for annual climatic status (English PDF)

气候年景评估方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 31, 2026

Implementation date

July 1, 2026

Scope

GB/T 33670-2026 is the English-translated version of 气候年景评估方法.

GB/T 33670-2026 is the Chinese standard "Assessment method for annual climatic status". Its scope clause reads: This document describes methods for assessing the degree of temperature deviation, precipitation deviation, and climate anomaly in a climate year.

This document applies to climate year assessments at the national, regional, and single-station levels. Its clauses include terms and definitions.

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Document preview — GB/T 33670-2026

National Standard of the People's Republic of China

ICS: 07.060
Classification: A 47
Replacing: GB/T 33670-2017

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1.Scope
2 Normative References
3.Terms and Definitions
4.Temperature deviation
5.Degree of deviation in precipitation
6.Degree of Climate Anomalies

1 Scope

This document describes methods for assessing the degree of temperature deviation, precipitation deviation, and climate anomaly in a climate year.

This document applies to climate year assessments at the national, regional, and single-station levels.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 20481-2026 Meteorological Drought Classification

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 climatological normal

Climate

Normal value

The average values of meteorological elements over the most recent three consecutive decades.

Note. According to the World Meteorological Organization (WMO) regulations, climate averages are updated every decadal. For example, for the period from.2011 to 2020, the 1981 values are used.

The average value from.1991 to.2010 is used as its climate average; for the period from 2021 to 2030, the average value from.1991 to 2020 is used as its climate average.

Average; and so on.

[Source. GB/T 21983-2020, 2.2, with modifications]

3.2 annual climatic status

The characteristics of climate elements for a given year are determined based on the degree of anomalies in the warming index, cold index, dryness index, and wetness index.

3.3

An index that comprehensively reflects the degree of higher-than-normal temperatures among the climate elements of a given year.

3.4

An index that comprehensively reflects the degree of low temperature among the climatic elements of a given year.

3.5

An index that comprehensively reflects the degree of above-average precipitation among the climate elements of a given year.

3.6

An index that comprehensively reflects the degree of precipitation below average in a given year's climate characteristics.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 9 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 20481-2026Grades of meteorological drought

Editions of GB/T 33670

Edition	Title	Revision	Status
GB/T 33670-2026	Assessment method for annual climatic status	current edition	Current
GB/T 33670-2017	Assessment method for annual climatic status	previous edition	Superseded

This page sells the current edition, GB/T 33670-2026. Earlier editions are listed for reference only.

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