According to a study by Nature’s Calendar, Britain’s native trees are producing ripe fruit, on average, 18 days earlier than a decade ago, probably as a result of climate change.

(The most marked change was seen in the rowan tree, which according to Finnish mythology was the first tree on earth:-

In the yard there grows a Rowan. 
Thou with reverent care should’st tend it. 
Holy is the tree there growing. 
Holy likewise are its branches. 
On its boughs the leaves are holy. 
And its berries yet more holy.
Excerpt from The Kalevala
a compilation of Finnish folk lore
 According to the study, rowan berries are now ready to eat nearly a month earlier than 10 years ago.)