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===Thornthwaite Mather method===
Step 1. Calculate the monthly heat index (i):
<math>i=\left ( \frac{T}{5} \right )^{1.514}</math>
<math>i=\left ( \frac{T}{5} \right )^{1.514}</math>
where:
T = mean monthly temperature.
Step 2. Calculate the annual heat index (I):
<math>I=\sum_{i=1}^{12}i</math>