GB/T 33675-2017 Cold winter grades GB/T33675-2017 |tt||Standard compression package decompression password: www.bzxz.net
This standard specifies the cold winter indicators, calculation methods and grade classification for single stations, regions and the whole country. This standard is applicable to the monitoring, prediction, evaluation and services of cold winter.

ICS07.060
National Standard of the People's Republic of China
GB/T33675-—2017
Cold winter grades
Cold winter grades
Published on 2017-05-12
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of the People's Republic of China
Implemented on 2017-12-01
GB/T 33675—2017
1 Scope
2 Terms and definitions
3 Cold winter index and classification
4 Determination of cold winter year
Cold winter threshold value method
Appendix A (Normative Appendix)
Appendix B (Normative Appendix)www.bzxz.net
References ·
National cold winter index calculation method
This standard is drafted in accordance with the rules given in GB/T1.1-2009. This standard is proposed by the China Meteorological Administration.
This standard is under the jurisdiction of the National Technical Committee for Climate and Climate Change Standardization (SAC/TC540). The drafting unit of this standard is the National Climate Center. The main drafters of this standard are Chen Yu, Xiang Yang, Zhao Lin, Zeng Hongling, Wang Ling, and Zou Xukai. GB/T33675—2017
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1Scope
Cold winter level
This standard specifies the cold winter indicators, calculation methods and level classification for single stations, regions and the whole country. This standard applies to the monitoring, prediction, evaluation and services of cold winter. Terms and definitions
The following terms and definitions apply to this document. 2.1
Winter mean air temperature Winter mean air temperature
The average temperature from December of the previous year to February of the current year (target year). Note: The unit is degrees Celsius (℃).
Climate average
climate normal
The average value of meteorological elements in the last 3 decades for 30 years. The calculation method is shown in Appendix A. 2.3
Anomaly
The difference between a meteorological element and its climate average. The calculation method is shown in Appendix A. 2.4
weather station
A meteorological observation station, also called a station or site. 2.5
region
A geographical range, such as an administrative area, a river basin area, etc., excluding the entire country. 2.6
cold winter threshold
Defines the critical value of cold winter at a single station. The value selection method is shown in Appendix A. 2.7
feffective grid
Effective grid
The national range is divided into grids according to the given longitude and latitude grid spacing, including grids with stations. 3 Cold winter indicators and level classification
3.1 Single station cold winter
GB/T33675—2017
When the average winter temperature anomaly (△T) of a single station is less than or equal to the cold winter threshold, it is defined as a single station weak cold winter (single station cold winter for short). The single station cold winter indicators and level classification are shown in Table 1.
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GB/T33675—2017
Grade index
Table 1 Cold winter index and grade classification of a single station
1.29a
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