求翻译：高美古晴空率最高时段为冬季12月-2月，晴空率70%以上；本年度11月至4月高美古晴夜数115天，其中12月-2月份晴夜数68天。是什么意思？

Gaomeigu the highest rate of clear sky for the winter period December-February, more than 70% clear sky; year from November to April Gaomeigu clear night 115 days, 12 January-clear night a few months 68 days.

Ancient cloudless sky high-rate is the highest in the winter time, the sky in December - February rate above 70 per cent from November to April; the year-old US trade days, of which 115 nights in December - sunny night 68 days during the month of February.

Gao Meigu the clear sky rate highest time interval is winter in December - in February, the clear sky rate above 70%; This year from November to April Gao Meigu clear night several 115 days, in which in December - in February clear night several 68 days.

High us rate maximum periods of winter December sky, clear sky rate of more than 70%; this year from November to April high old clear night number 115 days, December nights and sunny 68 days.

High us rate maximum periods of winter December sky, clear sky rate of more than 70%; this year from November to April high old clear night number 115 days, December nights and sunny 68 days.