I have a dozen plants in bloom (outside) this late-December,

including this Bidens hybrid and white cyclamen
in one of the troughs I have scattered about within 20 metres of my house,

Chænomeles x 'Scarlet and Gold',
Winter Jasmine, very pale blue Vinca,
two other colours of cyclamen,
two varieties of rose, Iris foetida,
Schizostylis (also known as Kaffir Lily!),
Salvia x Greggii, Echeveria species...

This is not, however,  due to climate change.