Dog Days of Summer: 

This phrase refers to the weeks between late July and late August. In many parts of the country, temperatures are highest this time of year.

這個短語指的是7月下旬到8月下旬之間的那幾周。在許多國家，每年這個時候氣溫是最高的。

It’s boiling outside!: 

When water reaches 212 degrees Fahrenheit, it begins to boil. While the weather outside never actually reaches that temperature, it can sure feel like it some days!

當水達到華氏212度時，它開始沸騰。雖然外面的天氣從來沒有達到那個溫度，但總有那么幾天你會覺得是這樣的!

Heatwave: 

Different parts of the United States define heatwaves differently. In most places, if the temperature has been at or above 90 Fahrenheit for at least two or three days in a row, it is considered a heatwave. If the weather forecast predicts a heatwave, take it easy and drink plenty of water.

美國不同地區(qū)對heatwave的定義不同。在大多數(shù)地方，如果溫度連續(xù)至少兩三天在90華氏度(大約32攝氏度)以上，就被認為是heatwave。如果天氣預(yù)報說有熱浪，請放松，多喝水。

This weather is hot as hell/an oven: 

In this idiom, it has a similar meaning to hell.

在這個習(xí)語中，它的意思是炎熱的天氣和地獄/烤箱相似。