Tropical night

A tropical night is a term used in many European countries to describe days when the temperature does not fall below 20 °C (68.0 °F) during the nighttime. This definition is in use in countries including Austria, Croatia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Italy, Ireland, Latvia, Lithuania, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Spain, Sweden, Switzerland and the United Kingdom.

In the United States, by contrast, the term sultry nights is used when the temperature does not fall below 27 °C (80.6 °F) in the Gulf and Atlantic states.

Tropical nights are common during heat waves and occur mostly over seas, coasts, and lakes. Heat gets stored in the water during periods of sunny and warm weather during the day, which is then emitted during the night and keeps the night temperatures up.

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