The Blues face five matches in 15 days from Saturday and the centre-back has called for eyes to remain focussed on all the tasks in hand.
City travel to Craven Cottage to face Fulham this weekend before their unbeaten home record goes on the line when they host second-place Liverpool on Boxing Day.
Manuel Pellegrini's side go on to tackle Crystal Palace the same week ahead of a New Year's Day date with Swansea, with their FA Cup campaign starting days later at Blackburn.
As the season's pace moves into top gear, Belgium international Kompany understands the significance of securing a good return from the hectic festive period.
"Nothing is won in December but a lot could be lost in December," he told the Manchester Evening News.
"At the moment we are doing the right things but nothing more than that. This is my sixth season in the Premier League and every time this has been the period when you start realising which teams might go on and win it and which teams aren't maybe the real deal.
"You don't win anything but you could lose the Capital One Cup, the FA Cup, and you could lose two or three games and be out of title race.
"That is what's at stake. Games come thick and fast and if you have bad form it can cost you at this time of the season."
City took centre stage last weekend, winning a nine-goal thriller against league leaders Arsenal 6-3 but despite being unbeaten in their last five outings; Kompany insists the next game is always the most important.
"We've not won anything yet," he added. "We're behind three points so you have to reboot every single time and put yourself back on track.
"You can't consider yourself a great team if you can't do that. I believe this is also why you want to be a Man City player. If you don't have that ambition then Man City is not the right club for you.
"We have done well so far but the Fulham game becomes the most important game of the season now."
Pellegrini's men have scored 23 goals in their last five fixtures at the Etihad and Kompany suspects City are building a fortress which strikes fear into the visitors.
"We're probably spoiling our fans a bit at home but we are happy we can do that for them," he said. "I don't know what it is. Maybe it has to do with the opponent fearing coming to our place.
"It is definitely not a case of motivation because we are always motivated to win every game. It's our home and you always like to be strong. I can't find an explanation."
The Blues continued their Capital One Cup march by booking a semi-final date with West Ham after beating Leicester 3-1 in midweek and Kompany is now targeting more top flight points to put pressure on Arsenal at the Premier League summit.
"Fulham is a great opportunity after the win against Arsenal to put more pressure on those above and around us," he added.
"One of the basics in football is that you should treat every opponent the same way and you should not fear any opposition.
"When we played Bayern we had an unbelievable result. We had two decent results in row at West Bromwich Albion and Southampton followed by the win at Arsenal.
"We had every reason to be confident but you play Leicester and you need the same motivation again or you are going to get a surprise. At the moment we are doing alright. Every day we have to hammer it."