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The heat capacity of a substance is the amount of energy required to change its temperature by one degree Celsius. Water, which forms the majority of oceans, has a higher heat capacity than most land materials, such as soil, rock, or concrete. This means that the ocean can absorb more heat than land before its temperature changes significantly. As a result, the ocean takes longer to heat up and longer to cool down, thus providing a stabilizing effect on the temperatures of oceanfront areas.

Thermal inertia is a property of a material that describes its ability to store heat and release it later, thereby resisting temperature changes. Due to the high heat capacity of water, oceans have a higher thermal inertia compared to land. This means that the ocean stores heat during the day and releases it at night, leading to more gradual temperature changes in coastal areas. Conversely, in inland areas, the land heats up rapidly during the day and cools down rapidly at night, leading to larger temperature fluctuations.

In coastal areas, the difference in temperature between the land and the ocean leads to the formation of local wind patterns called sea breezes and land breezes. Due to the ocean's high heat capacity, during the nighttime, the land typically cools down faster than the ocean. This causes a land breeze, which blows cool air from the land towards the ocean, helping to moderate temperatures in coastal areas. During the daytime, the land heats up faster than the ocean resulting in a sea breeze which blows cooler ocean air inland. These local wind patterns help to smooth out the temperature fluctuations of oceanfront areas.

Ocean currents play a vital role in distributing heat across the surface of the Earth. Warm and cold air currents that flow along the coasts of continents help to moderate the temperatures of oceanfront areas. These currents transport warm water from the equator toward the poles and cold water from the poles to the equator, keeping coastal temperatures relatively stable compared to inland areas. In conclusion, the main factors that contribute to smaller temperature fluctuations in oceanfront areas compared to inland areas are the higher heat capacity of the ocean, its thermal inertia, coastal winds, and ocean currents. These factors help to distribute heat more evenly, leading to more stable temperatures along coastlines.