Counting Decimal Numbers

I am trying to find a way of counting decimal numbers if, say, they begin with 3.

For example, I might have 3.33, 4.1, 3.0, 5.65, 3.8, 3.7, 3.33, etc.

I want to count anything that begins with 3 (3.33, 3.0, etc). Using the data above the answer would be 5 ...5 numbers that begin with a 3.

If this possible?

There doesn't appear to be the facility with Countif. I don't want to truncate the data (the spreadsheet already is quite extensive). I have tried using =SUMPRODUCT((Y$2:Y$170 >=3)*(Y$2:Y$170<=3.9)) but this will return an answer only when there is a complete set of data within cells within the range.