selecting grid points of data

Hi guys. I have gridded daily climatic data(prep, tmax and tmin)running tons of thousands. I want to pick few gridded points to form a time series data for my analysis. Each worksheet contains gridded data for just a day of the year. For example, worksheet 1 contains gridded data for 2000 jan 1 and worksheet2 for 2000 jan 2.... and the data is for more than 30 years. I want to pick for example year 2000 jan1...31, feb1-28,...to december1-31 on grid points 4.5/9.5(lat/long). see attached for the data format and example.Thanks for the help