We are close to a knowledge of annual summer and winter temperature variations over much of the northern hemisphere going back 600 years.

我们很快就会知道，600年前北半球大部分地区每年夏季和冬季的温度是如何变化的。

youdao

In Denmark, there can be up to 17 hours of darkness per day in winter, and the average temperature is around 0℃.

在丹麦，冬天每天有长达17个小时的黑夜，平均气温在0℃左右。

youdao

Thanks to a hot spring almost 40m below ground, the temperature of the lake never dips below 23C, even in winter, allowing swimmers to float alongside the pink and white lotus all year round.

因为温泉差不多都在地下40米，湖水的温度从未低于23度。 即便在冬天，游泳者也可以随着终年的桃红色和白色莲花一起漂浮。

youdao

Inside the greenhouse, lines of bright sodium lights shine down on the growing tomato plants, and the temperature remains a constant, warm 23C -- even in the depths of winter when outside temperatures drop well below freezing.

BBC: A local food scene burns in Iceland

They will be closed only for short periods of time and only during the winter when the water temperature and light are too low for algal blooms.

ECONOMIST: Flood barriers

They mounted sensors on white whales to measure the salinity and temperature patterns of the fjord during its initial winter freezing.

BBC: Whales probe Arctic fjord's secrets