In Sweden, Spring officially starts on the first of 7 days when the average temperature is above freezing. This means it’s only possible to refer to it retrospectively, as you can only assess it after a week.
In Stockholm, this occurred on 21st February, so it’s apparently been Spring for a fortnight.
(No, it’s not this far into the Spring yet)
Update: 9th March
We went for a walk round the neighbourhood yesterday, and the feeling has totally transformed. There were kids from age 5 out on their bikes, entirely unsupervised, and a feeling of lazy warmth was everywhere. And this in 10C!