Black tea suitable for sunny spring and summer days

Have you tried Nilgiri teas, especially those produced in the spring? They don’t have the maltiness of Assams though. I sourced a couple from last year that were very well received – folks routinely dismiss Nilgiri black teas as base teas for blending, but my experience was very different and positive.

I myself don’t have much experience with Autumn Darjeelings, but there are characteristics that seem to match your description.

Hey! Have you ever tried Keemun Imperial?
I would say its a stellar option. It’s sweet, mellow, and both roasty & floral at the same time.