The National Library of Wales has digitized and placed online a large collection of almanacs. An almanac is an annual publication that includes information such as weather forecasts, farmers’ planting dates, tide tables, and tabular information often arranged according to the calendar.
For instance, Thomas Jones’s almanac, usually published under the title Newyddion oddiwrth y sêr (News from the stars), consisted of 20 or 24 leaves. It contained an astronomical and astrological guide for twelve months, lists of fairs and markets in Wales and the Borders, samples of Welsh poetry and literature, a chronology of important historical events, a guide to reading Welsh and keeping accounts, a list of the law terms, the names of Welsh bishops, and miscellaneous advertisements. It was aimed at poor farmers who relied on detailed weather forecasts for their livelihood, and who also held a superstitious belief in astrology.
I suspect this is a rich source of information about the history and lifestyles of Wales. I have to say that I “suspect” this as I cannot read the almanacs, they are mostly printed in the Welsh language!
If you have Welsh ancestry and if you also read Welsh, you will want to look at the Welsh Almanac Collection at https://goo.gl/7mL4cd.