What effect does proximity to the ocean of a biome have on its climate?

The effect of proximity to the ocean of a biome on its climate is that water heats and cools more slowly than landmasses. Hence, the regions surrounded with ocean will stay cooler in summer and warmer in winter, thus creating a more moderate climate with a narrower temperature range.

Large bodies of water, such as oceans, seas and large lakes, can affect the climate of an area. Water heats and cools more slowly than landmasses. Therefore, the coastal regions will stay cooler in summer and warmer in winter, thus creating a more moderate climate with a narrower temperature range.