Hmm... Monaco’s climate.
January is the coldest month with average high/low = 54.1/46.6.
August is the hottest month with average high/low = 78.6/70.7.
Not bad at all.
Monaco has a micro-climate. 300 days of sunshine per year.
The Cote d’Azur (Riviera) started out as a winter resort for European & Russian nobility who came there to escape their cold Northern climates.
Queen Victoria spent much time there,& made the French Riviera fashionable. Even today, much of the Riviera is British is style, but verySoutgern in climate.