The Earth travels around the Sun.

The Earth's axis is tilted.

Depending on where you live, the seasons happen at different times of the year.

northern = 北方的
south [saʊθ] = 南方
southern ['sʌðɚn] = 南方的

描述天气: It's + 形容词
在某个季节 ： in = 季节
in (the) winter = 在冬天
It's really cold in winter.

chilly ['tʃɪli] = too cold to be comfortable = 寒冷的
It's so chilly in winter in ShangHai!

freezing = 冷到结冰
It's freezing outside!

very day is hot, and humid.

hot <--> cold

humid = 湿热的
sweat = 出汗

In humid weather, you may sweat a lot.

burning / boiling hot = 酷热至极
It's burning / boiling hot in summer in Wuhan!

boiling <--> freezing

warm = 暖和的
get warmer = 变得暖和了

cool = 凉爽
It's cool in autumn.

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