Comparision the different DD calculating methods based on the daily mean, max-min, 24-hours temperature, and 24-hours temperature integral calculation, whether it could describe the accurate time interval about temperature higher than the lower development threshold temperature (C) and simulate actual temperature variation trends accurately.

<p>Note ‘−’ represents ‘not’ while ‘+’ represents ‘yes’. Relative error represents the results (X) by different methods comparied to 24-hours integral calculation (Y), as follow: Relative error (%) = |X-Y|/Y*100%.