Answer:
• a summer's day
Step-by-step explanation:
The speaker is comparing the person they care about to "a summer's day." This comparison likely means that the speaker finds the person to be warm, bright, and joyful, much like a summer's day is typically seen as a time of happiness and light. The use of this comparison suggests that the speaker holds this person in high esteem and sees them as a source of comfort and joy in their life.