What is it?

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(5) January (5) (9) February (9) (3) March (3) (7) April (7) (7) May (7) (4) June (4) (1) July (1) (6) August (6) September October November December

January February March April May June July August September October November December

January February March April May June July August September October November December

January February March April May June July August September October November December

January February March April May June July August September October November December

January February March April May June July August September October November December

January February March April May June July August September October November December

January February March April May June July August September October November December

January February March April May June July August September October November December

January February March April May June July August September October November December