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Step 2. Calculate the annual heat index (I):
Step 2. Calculate the annual heat index (I):
<math>I=\sum_{i=1}^{12}i</math>
<math>I=\sum_{i=1}^{12}i</math>
Step 3. Calculate an uncorrected Potential Evapotranspiration (PET<sub>uncorrected</sub>):
<math>PET_{uncorrected}=1.6\cdot \left ( \frac{10\cdot T}{I} \right )^{\alpha }</math>
where: α = 6.75 x 10<sup>-7</sup>''I<sup>3</sup>'' - 7.71 x 10<sup>-5</sup>''I<sup>2</sup>''+ 0.0179''I'' + 0.49