In mid-latitude regions, the diurnal variation in weather is due to

In mid-latitude regions, the diurnal variation in daily weather is primarily caused by advection [1]. Advection refers to the transfer of heat through the horizontal movement of air, which is relatively more significant than vertical movement in these regions [1]. While conduction heats the lower layers of the atmosphere and convection involves the vertical transmission of heat through rising air currents, these processes are more localized or confined to the troposphere [1]. In contrast, the middle latitudes (30° to 50°) experience significant heat transfer across latitudes, which drives much of the stormy weather, including jet streams and temperate cyclones . This horizontal transport of atmospheric properties by mass motion (advection) is the dominant factor influencing the day-to-night weather changes in these specific geographic zones [3].

Sources

1. [1] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 8: Solar Radiation, Heat Balance and Temperature > HEATING AND COOLING OF ATMOSPHERE > p. 68
2. [3] https://www.weather.gov/cae/weatherterms.html