Why Does Fog Delay Flights in Delhi During Winter but Not Summer?

Key Factors Behind Seasonal Fog Differences

Temperature

Winter: Temperatures often drop below 10°C, making the air denser and more conducive to fog formation.

Summer: Temperatures typically exceed 35°C; warmer air holds less moisture, reducing fog likelihood.

Humidity

Winter: Higher humidity levels due to reduced evaporation provide ample moisture for fog.

Summer: Drier air with lower humidity prevents dense fog formation.

Wind Speed

Winter: Calmer winds allow fog to accumulate near the ground without dispersion.

Summer: Stronger wind currents from increased convection disperse any fog that forms.

Solar Radiation

Winter: Shorter days and lower sun angles reduce solar radiation, helping fog persist.

Summer: Longer days and higher sun angles increase solar radiation, evaporating water droplets and inhibiting fog.

Summary

The combination of low temperatures, high humidity, calm winds, and weak sunlight in winter creates ideal conditions for persistent fog, causing flight delays. In summer, the opposite conditions prevail, keeping skies clearer.

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