First one out here 1st week in January yet snowdrops just at
their peak now!
I don't think you'll find one size that fits all!

The daffodils are budding, but that's all, we have one crocus
and the
Lesser Celandines have appeared but no flowers yet.

Snowdrops are almost over - they've been out for over a month.
Crocuses are at their best, having actually bloomed before the
recent snow. Aconites in flower in Elgin on 9 February as I was
an my way to the dentist. No lesser celandines observed yet, but
plenty of butterbur down by the river before the snow started.
One iris reticulata appeared after the first snow and before the
latest lot, and the daffodils are all coming up fast. Daphne
also in bloom.

Anne