Unexpected Autumn Colors at Sojiji Temple in the Midst of January

Canon EOS 6D, Tamron SP 90mm F/2.8 Di MACRO 1：1 VC USD (90mm, f/6.3, 1/60 sec, ISO-640)

It was a miracle that I found the autumn colors today because we are in the midst of January, and because I was personally thinking that the walk around Kamakura on December 20 was definitely the last autumn colors of this season.

Autumn Colors Report 2014 – Kamakura to See Last Autumn Colors This Year

While I was walking down the street of Sojiji Temple, I found this Japanese maple tree with orange leaves and yellow leaves. There's no reason not to shoot this miracle.

Canon EOS 6D, Tamron SP 90mm F/2.8 Di MACRO 1：1 VC USD (90mm, f/6.3, 1/60 sec, ISO-640)

Yellow leaves looked more energetic than the orange ones both in the extent of witheringness and in number.

Canon EOS 6D, Tamron SP 90mm F/2.8 Di MACRO 1：1 VC USD (90mm, f/6.3, 1/60 sec, ISO-500)

It seems like some temples have autumn colors for really a long time. Is there any study on the period of autumn colors in Japan?