According to the ancient Celtic calendar autumn begins in early August with the feast of Lughnasa, the ancient god, and winter begins at Martinmass (November 11), with Spring starting on Brigid’s Day (February 1). However, the weather in Ireland generally corresponds to the astronomical calendar, with Autumn beginning with the Autumn Equinox, and Winter beginning with the Winter Solstice, and ending with the Vernal (Spring) Equinox.
The weather we have at the moment is certainly autumnal rather than wintery. In fact, we have had a classic Autumn this year, beginning mild and with temperatures almost up to those of summer, and then suddenly plummeting to frosts early on November 1. And then it became mild again, and very wet at the end of November, and now we have reached a dry spell with weather due to become frosty again. This weather is perfect for autumn moths, and this year I have seen some very interesting and beautiful ones. There have been quite a few but these ones are especially interesting. Firstly, in late November this male Feathered Thorn (Colotois pennaria) appeared after a female had briefly waited in the same place. This species flies from September until early December.
Next was the larger Mottled Umber (Erannis defoliaria), a moth which flies from October until January, and seems to like it colder than most moths. The male and female are easy to tell apart because the female has no wings and doesn’t even look very much like a moth. Hopefully I’ll get a photo of one soon to upload.
Finally, a drab but common moth which comes to windows frequently is the November Moth (Epirrita dilutata) which flies from September until early December, weather-permitting. Although this one looks large in the photo these moths are actually only as large as a thumbnail.