Polia nebulosa (Grey Arches)
Observations/month
| Month | 1981–2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2024 | total | |
|---|
| Januar | | | | | | | | | | | | | | | | | |
| Februar | | | | | | | | | | | | | | | | | |
| Mars | | | | | | | | | | | | | | | | | |
| April | | | | | | | | | | | | | | | | | |
| Mai | | | | | | | | | | 3 | | | | | 1 | 1 % | |
| Juni | 4 | 5 | 6 | | 2 | 15 | | 31 | 2 | 19 | | 4 | | | | 33 % | |
| Juli | 9 | 18 | 21 | 10 | 24 | 14 | 12 | 10 | 20 | 3 | 10 | 1 | 2 | 3 | | 59 % | |
| August | | 2 | | 3 | 1 | | 12 | | | | | | | | | 7 % | |
| September | | | | | | | | | | | | | | | | | |
| Oktober | | | | | | | | | | | | | | | | | |
| November | | | | | | | | | | | | | | | | | |
| Desember | | | | | | | | | | | | | | | | | |