a red-hued sunset ...1863 Eng. dial. (Norfolk)
from the colour of the bullfinch
FIRST DOCUMENTED USE
1863 - see Example below
"...While we look on, it changes, deepening as soon as the
sun has gone down into a glossy lurid crimson. An old shepherd,
quite as high an authority on weather matters within the village
precincts as Admiral Fitzroy himself, first drew my attention to this
'bullfinch sky' - so he called it - as a certain portent of foul weather."
From: Chambers's Journal of Popular Literature, Science and Arts, Volume XVIII, 1863
"Our Winter Pensioners"
• The English Dialect Dictionary, Joseph Wright, 1898-1905