The phrase 'halfway through the year' is correct and can be used in written English. It generally indicates that six months have passed in the year. For example, you might say, "We are now halfway through the year and it's already been an eventful one.".
It routinely runs out of money halfway through the year.
Halfway through the year, Josie changed and became brighter and less complaining.
"We're in a good spot halfway through the year," D'Antoni said.
It's difficult to change a rule and then change it again halfway through the year".
"We were halfway through the year before we knew what we were doing at all".
Nearly halfway through the year, stock-market investors the world over are nursing losses.
Headteachers there also claim exam boards raised grade boundaries in English halfway through the year.
Thanks to Ludwig my first paper got accepted! The editor wrote me that my manuscript was well-written
Listya Utami K.
PhD Student in Biology, Bandung Institute of Technology, Indonesia