It took us a surprisingly long time to notice the weather. In Anglo-Saxon literature, Harris notes, “precise evocations of weather” are rare
I haven’t read Harris’s book, so I’m not sure exactly what she said, but this conclusion sounds quite wrong to me. There are many references to the weather in Old English literature. The word hagol (hail) appears in the corpus some 130 times and even is used as the name of a rune. Forst (frost) appears some 55 times. Hrim (rime, frost) appears 22 times. Poems like The Seafarer and Beowulf routinely make mention of the weather, especially inclimate weather.
One must also take into account the nature of the literature that survives. The vast bulk of the documents are charters (deeds, wills, other legal documents), homilies, and hagiographies. These aren’t very likely to contain mentions of weather. The Anglo-Saxon Chronicle only gives one-line descriptions of major political events. We have very few (I would say “none,” but there is probably something I’m not aware of) first-person accounts of any kind, the type of documents that might off-handedly mention the weather.