This is the 16533rd most frequent Polish word.
wiosennego
"Of spring" or "springtime" (genitive singular form).
In this sentence, 'wiosennego' is an adjective describing the noun 'deszczu', denoting that the rain is characteristic of spring.
Uwielbiam zapach wiosennego deszczu.
I love the smell of spring rain.
Here, 'wiosennego' serves as an adjective qualifying the noun 'krajobrazu', indicating the landscape is typical of spring.
Podczas spaceru podziwialiśmy widok wiosennego krajobrazu.
During the walk, we admired the view of the spring landscape.
In this example, 'wiosennego' describes the noun 'nieba', suggesting the hue is reminiscent of the sky's appearance in spring.