Humid Continental Climate - Explanation of Lettering

Explanation of Lettering

Under Köppen, the following variants of this climate are possible:

  • The second letter
    • w: a dry winter — the driest winter month has at most one-tenth of the precipitation found in the wettest summer month.
    • s: a dry summer — the driest summer month has at most 30 millimetres (1.18 in) of rainfall and has at most ⅓ the precipitation of the wettest winter month.
    • f: Does not meet either of the above specifications.
  • The third letter
    • a: Warmest month averages above 22 °C (71.6 °F)
    • b: Does not meet the requirements for a, but there still are at least four months above 10 °C (50 °F).

Read more about this topic:  Humid Continental Climate

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