Original: The 'Nagami' kumquat requires a hot summer, ranging from 25°C to 38°C (77° to 100°F), but can withstand frost down to about  without injury.
Simplified: The 'Nagami' kumquat needs a hot summer, ranging from 25 ºC(77ºF) to 38º C(100.4ºF), but can withstand frost down to about &minus;10 °C(14ºF).