Thornthwaite Moisture Index

The Thornthwaite Moisture Index is a tool used to assess the moisture balance of a region. It compares the amount of precipitation (rain and snow) with potential evaporation (how much water could evaporate based on temperature and sunlight). This index helps classify climates, indicating whether an area is wet, dry, or seasonal. It is useful for farmers, ecologists, and planners to understand water availability for crops, ecosystems, and urban development. A positive index suggests surplus moisture, while a negative index indicates a deficit, guiding resource management decisions.