What is Celsius degrees to tenths?
Your question is similar to this one: Deciphering NCDC data

In the comments for that question I posted the following two comments which will most likely answer your questions:


  regarding the usage of tenths of a degree, it may be a continuation of an ancient data format from the early era of computers. Removing decimal points changes numbers to integers. In old computers memory capacity &amp; calculating speed was an issue. In binary digits, integers are half the size of floating point numbers &amp; a quarter the size of double precision numbers. Hence the use of integers speeds up calculations &amp; requires less memory (disk drives, tape &amp; RAM) than floating point numbers. In the old days, tape was used heavily as an external storage medium
  
  There is logic in maintaining the old data format for consistency. If the data format was changed then all the old data would need to be changed &amp; checked to ensure there were no errors. If the format was changed as of a certain date but the old data remained in the old format, people would need to be mindful of the change &amp; when it occurred. Analysis apps would need to first check if the data was from before or after the date of change, condition the data accordingly before doing the calculations. It's easier to keep the old format