anytime day or night
winter
it's a year-round constellation.. but it's best seen in fall! ^^
Capricornus is best viewed in the fall, specifically September.
summer
Summer
winter
Orion is best seen in the Winter.
It depends on your location
It is a good example of a constellation - a group of stars forming a recogniseable shape when viewed from Earth.
in november
A night
If you are in the northern hemisphere, winter is the best time to observe Leo the Lion.