Phenology charts on this site are of the Fantail Phenology format based upon Polar Area Charts.
First described in Dipterists Forum Bulletin 86 where the methodology was summarised.
Spreadsheet file at https://drive.google.com/file/d/1SKsRVrMJ9c72YRbcgfZfCSDPq7BuAK3R/view
- Because the default image quality of a copied Excel chart is poor, the Excel addon XL Toolbox may prove valuable.
Sumner, D. P. (2018). Phenology and Polar Area Charts (Fantail Phenology). (DOI: 10.13140/RG.2.2.35333.06887), (5), 1–8