Better a sunny or a rainy on the first working day? Everyone agrees that the first working day after an holiday is the toughest one because you don't want to work, you have tons of unread emails and it seems that anyone pretends a quick and decisive answer from you about the trickiest tasks. So you are feeling unhappy and overwhelmed and you want only to run away as fast as you can, come home and sleep until the storm is over. In this situation what can improve your mood? A sunny weather so you think 'Oh at least the sun is warming this sad day and cheers me up' or a rainy day so you think 'Oh good with this rain there is nothing to do but work'? I think the answer depends on personal disposition because some people become sadder with bad weather. For me it's the same because I'm not influenced by the weather.