[ncl-talk] confirm the first day greater than 0 degree

[WIND]

Dear all,
  
 Thanks for reading, I'm dealing with the three-dimensional grid temperature data (ordered by time, lat, lon). I want to confirm the first day (position in the time dimension) in each lat/lon that the temperature is greater than 0. It's hard for me to think about how to write the "if" statement. Are there some relevant statistics function in NCL? It will be so nice that anyone would provide some advice.
 Any help would be appreciated!
  
 Sincerely,
 Wind
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