It's a good question. My take on this is that the definite article is optional in these cases. My wife: I am so tired of all the Christmas shopping!
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AnonymousI cannot think of a situation where "What time of year..." is used.Is this really correct? Google Ngrams shows it just as frequent in the US as the UK, in fact a bit more so, and it's certainly familiar enough in the UK.
AnonymousIn the US, "What time of year..." would typically be heard in rural areas, since it is considered somewhat less than standard usage:This does not appear to be correct.
fivejedjonThis does not appear to be correct.There are citations for 'What time of Year' in the Corpus of Contemporary American English from the San Francisco Chronicle, Washington Post, NBC, CBS and several academic sources.Thanks for digging those out. I found it a surprising claim.