Darkened (PJO/FROZEN)

Lol~ this is so random. 
So long story short, we are doing a frozen based musical at my school. 
And technically everyone in my school has a PJO nickname, so I wrote down the entire cast with those nicknames. 
(Some of them being really ridiculous like Clarisse as the troll, and Ethan as the duke of weasel town) 
And my friend Mei (Kyle), (some of her art is on my page) who is nicknamed Jason is Anna 
Myself, nicknamed Nico, is Elsa. So I decided to draw this~ 

I like Drawing Jason with longer hair and glasses. The black streak, obviously isn't cannon I just felt like adding it...
Nico looks ridiculous. 

No one reads descriptions these days, so whoever reads this first and answers the following question will get a PRIZE!! (even if they answer it wrong. If the first person gets it wrong, The first person to get it right will also get a prize)

The Question: A man lives on the tenth floor of an apartment building. 
On sunny days, he takes the elevator to the sixth floor and climbs the rest of the way up the stairs, unless there are other people in the elevator. Then he takes it all the way to the tenth floor. 
On rainy days, the man takes the elevator all the way to then tenth floor with or without other people in it. 
Why?