The frost-free period of most of the native range is about 240 days.

In some years, the frost-free period has been as short as 81 days.

The frost-free period in the city lasts on average for about 135 days.

Sunlight remains until 21:00 hours, and it has a frost-free period of 209 days.

The frost-free period covers 228 days, Average humidity is 78%.

The frost-free period may be as little as 3 months.

The frost-free period lasts on average 190 days per year.

The annual sunshine hours are 3,194 and frost-free period is 142 days.

The annual frost-free period lasts from 260 to 280 days.

As of 2003, the frost-free period on the island was very short, usually not more than 20-to-25 days, and more often only two weeks.