Although IMRG forecast same for November and December in the UK at £2.2bn spent, I think December may exceed November slightly since satisfactory deliveries last year may mean people order slightly later and feel more comfortable with last minute shopping online. Also, your item refers to a peak in visits - people often visit many sites and then come back to spend at only one or two so that spending visits peak later than research visits.
US shopping seems to have peaked in week 2 of December:
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