Hi,

In the article “Using Weather Adjustments” are errors in the Zimmermann formula section:

*Summary of formula: Watering Percentage = (100 + (T-70)*4 + (30-H) – 200*(P-0)) %*

Should not contain numbers but the base variables (BT, BH, BP)

**Summary of formula: Watering Percentage = (100 + (T – BT) * 4 + (BH – H) – 200 * (P – BP)) % = 112%**

*Example: let’s say yesterday’s T, H, P are 86 F, 68%, and 0.12″ respectively.*

Humidity value used in the calculation below is not 68 but 58

**Example: let’s say yesterday’s T, H and P are 86°F, 58% and 0.12″ respectively.**

*the final formula is: Watering Percentage = (100 + (T-BT)*4*WT + (30-BH)*WH – 200*(P-BP)*WP) %*

“30-BH” should be “BH-H”

**the final formula is: Watering Percentage = (100 + (T – BT) * 4 * WT + (BH – H) * WH – 200 * (P – BP) * WP) %**

**The weighting part of the formula seems wrong, the result for the given example values is 1300%, expected are 112%**