Wiktionary
mid-april
a. Happening in the middle of April. adv. In the middle of April. n. Any time in the middle of April.
WordNet
mid-April
n. the middle part of April
Usage examples of "mid-april".
In mid-April three more planes dropped 1,200 pounds of food, but as people scrambled to gather it up, a government helicopter appeared overhead and fired down on them while groundfire came from all sides.
At their latitude, perpetual night would begin a little after mid-April.