During which season is earth resistivity generally higher in most parts of the country?

In most parts of the country, earth resistivity tends to be higher during the summer months. This phenomenon can be attributed to several factors related to soil moisture content and temperature.

During summer, the ground is generally drier, as prolonged periods of warmth lead to increased evaporation and reduced precipitation in many regions. Drier soil has a higher resistivity due to a lack of water, which otherwise helps to conduct electricity more effectively. The combination of high temperatures and low moisture content causes the soil to lose its conductive properties, resulting in greater resistivity.

In contrast, during winter and other seasons, precipitation and moisture levels are typically higher, leading to lower resistivity in the earth as water acts as a conductive medium. As such, understanding this seasonal variation is crucial for applications in electrical engineering and geophysics, where accurate knowledge of earth resistivity can impact grounding systems, electrical installations, and survey methods.