The accumulation of hydrates in oil and gas pipelines can lead to flow blockage during either normal operation or shutdowns (i.e., in static conditions) and, therefore, presents an important flow assurance challenge. We investigate experimentally the role of heat transfer on the lateral growth of hydrates over a sessile water drop submerged in cyclopentane at sub-zero temperatures. Spatiotemporally-resolved temperature measurements in cyclopentane were performed using a one-colour planar laser-induced fluorescence (PLIF) method. It is found that the temperature and heat transfer coefficient in the bulk cyclopentane phase above the water drop interface are both higher during hydrate formation and growth compared to when hydrates are absent, and this can be attributed to the hydrate growth phenomenon, though the mechanics are yet not fully understood.