One explanation for the trend to more superhot fires is that the region, which usually has dry summers, has had significantly below normal precipitation in many recent years.

对于超高温火灾增多的一种解释是，该地区夏季通常很干燥，近年来降水量明显低于正常水平。

youdao

The water level of the Mississippi River is already 6.5 feet below normal.

密西西比河的水位已经比正常水位低6.5英尺。

《柯林斯英汉双解大词典》

Snow levels in the Sierra Nevada mountains are below normal for the third year in a row.

内华达山脉的雪线已是连续第三年低于正常高度了。

youdao

Elsewhere in Wales, most rivers remained at or below normal levels according to its website.

BBC: Wales weather: Flood alert as heavy rain forecast

But researchers heard a nine-year-old whale named NOC make sounds octaves below normal, in clipped bursts.

BBC: Beluga whale 'makes human-like sounds'

Now, the savings rate rests at a below normal 3.3 percent, probably headed towards zero.

FORBES: My Country Fails Me, Twice