During the ice crystal process of rain formation:

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Ice crystals grow larger at the expense of the surrounding liquid cloud droplets during the ice crystal process of rain formation. This process is also known as the Bergeron-Findeisen process. The presence of ice crystals, as well as supercooled liquid cloud droplets, is necessary for this process to occur. The temperature in the cloud does not necessarily need to be below -40°C for this process to occur, although it typically occurs in clouds that are colder than 0°C. The type of cloud is also not a requirement for this process to occur.

During the Ice Crystal Process of Rain Formation