"month mark" is correct and can be used in written English.
It refers to a specific point or milestone within a month. Example: "We have reached the three-month mark since we started our project."
I have won manager of the month, Mark (Ellis) won player of the month.
Only three months ago, it hit the $1 million transactions a month mark.
In the case of British Columbia, the results indicate that the simulated control group does not match the experimental control group at the 12 month mark.
Six subjects have reached the 6 month mark and we have had 100%% attendance in the intervention group and 100%% completion for SF36.
The post commemorating this one million in one month mark also has some interesting stats.
At my 7 month mark I had had enough.
He recently passed the six-month mark of his presidency.
The six-month mark, in February, coincides with the Chinese New Year, providing a chance for fresh marketing fireworks.
This factor may help explain the improvement seen in the control group (Crest®) at the 3-month mark.
At forecast horizons of one month, the model produces an in-sample AUC near 0.90, which then tapers toward 0.75 at the 12-month mark.
The balloon then opens up right around the four-month mark and the body excretes it.
