There has been a period of settled weather.

曾有一段时期天气很稳定。

《柯林斯英汉双解大词典》

I think everyone is settled in London, although neither the weather.

尽管天气和食物都不好，但是我想每个人都已经在伦敦住下了。

youdao

The weather has settled at last.

天气最后总算稳定了下来。

youdao

The longest spells of settled weather occur during calm but cold days in winter.

BBC: Czech Republic

As elsewhere on the coasts of the southern Mediterranean, winter weather can be changeable from day to day with cool, cloudy, rainy spells interrupting the generally warm, sunny, and settled weather.

BBC: Libya

There's a very high chance of dry, settled nocturnal weather between now and Sunday night, with some local mistiness by dawn.

BBC: Glastonbury Festival 2010 weather forecast