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Climate ratio is used to describe the moisture side of climate. It compares the precipitation (P) with the potential evapotranspiration (Ep) for a region. One way to do this is to express the relationship between them as a ratio using the formula:

Climate ratio = P / Ep

When the potential evaporation is greater than yearly precipitation, this ratio is less than 1. When precipitation is greater than evapotranspiration, the ratio is greater than 1.

P: precipitation (in mm) or the amount of moisture available for evapotranspiration, evapotranspiration is the combined process of evaporation and plant respiration.

Ep: potential evapotranspiration (in mm) or the amount of moisture needed for evapotranspiration. This value increases as temperature and plant life increase.

The climate ratios are used to determine climate type:

P/Ep:

Less than 0.4: arid climate

0.4 - 0.8: semiarid climate

0.8 - 1.2: subhumid climate

Greater than 1.2: humid climate

Source: NOAA

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Q: What is a climate ratio?
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