Blank Monthly Calendar — Fill-In (Modern)
niftyshelf.com — free for personal and commercial use.

blank-monthly-calendar-printable-fill-in-letter.pdf  US Letter (8.5 x 11 in), landscape
blank-monthly-calendar-printable-fill-in-a4.pdf      A4 (210 x 297 mm), landscape

Print tip: choose 'Actual size' (100%) in your print dialog. All dates verified for the calendar year; US federal holiday dates follow OPM rules (observed dates included).
