Let r be a radius of a given circle and α be an angle, that corresponds to a sector.
The circle area is

and denote the sector area as

.
Then

(the ratio between area is the same as the ratio between coresponding angles).

.
You are describing where I live only that temperature is a bit low. I'm sorry to say it is neither one.
t_daily = t_average +/- 5
The highest temperature would be
t_daily = t_average + 5
t_daily = 1 + 5
t_daily = 6
================
The Lowest temperature would be
t_daily = t_average - 5
t_daily = 1 - 5
t_daily = - 4
Sounds about right for December.
"Product" means to multiply, so you have to multiply 379 by 8 to get 3,032; it's between the numbers 3,031 and 3,033