Cossinae
Observations/month
| Month | 1988–2007 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | total | |
|---|
| Januar | | | | | | | | | | | | | | | |
| Februar | | | | | | | | | | | | | | | |
| Mars | | | | | | | | | | | | | | | |
| April | | | | | | | | | | | | | | | |
| Mai | | | | | | | | | | | | | | | |
| Juni | 1 | | 7 | 2 | 1 | 1 | | 2 | 1 | | | 1 | | 40 % | |
| Juli | 1 | 2 | 6 | 5 | 1 | | 1 | | 3 | | 1 | | 1 | 53 % | |
| August | 1 | | | | | | | | | 1 | | | | 5 % | |
| September | | | | | | | 1 | | | | | | | 3 % | |
| Oktober | | | | | | | | | | | | | | | |
| November | | | | | | | | | | | | | | | |
| Desember | | | | | | | | | | | | | | | |