It seems like it’s the opposite. Maybe the less sun people have, the more they work to survive, the more developed they become and thus – more happy.
African countries have been made dim in this graph because they show less clear relationships – in the Sub-Saharan region, they all occupy the bottom part of the happiness chart, in the Middle East & North Africa, they occupy just a narrow band in the sunshine spectrum.
What: Happiness score from World Happiness Report and Yearly sunshine hours. Since it’s impossible to calculate sunshine hours for the whole country which might be as diverse as the USA with Florida and Alaska, a simple average of available cities was calculated.
Where: Countries that have both statistics. Western & European countries include Europe, USA, Canada, Australia and New Zealand.
Source: WHR and W: https://en.wikipedia.org/wiki/List_of_cities_by_sunshine_duration