Coldwave number (CWN) as defined by the Excess Cold Factor (ECF). (CWN_ECF)
https://w3id.org/hacid/data/cs/climdex/indices/CWN_ECF <https://w3id.org/hacid/onto/data/Variable>
See Appendix D and [Nairn and Fawcett (2013)](#appendixa_refs) for more information.
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Coldwave number (CWN) as defined by the Excess Cold Factor (ECF). (CWN_ECF)
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CWN_ECF
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The number of individual ‘coldwaves’ that occur each year.