Endothenia
Observations/month
| Month | 2006–2009 | 2010 | 2011 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2023 | 2024 | total | |
|---|
| Januar | | | | | | | | | | | | | | |
| Februar | | | | | | | | | | | | | | |
| Mars | | | | | | | | | | | | | | |
| April | | | | | | | | | | | | | | |
| Mai | | | | | | | | | | | | | | |
| Juni | | | 4 | | 1 | | 4 | 2 | 1 | 7 | 1 | 1 | 27 % | |
| Juli | 4 | 4 | | 3 | 7 | 1 | 2 | 8 | 7 | 11 | | | 59 % | |
| August | 1 | | | 2 | 1 | 1 | | | 4 | 2 | | | 14 % | |
| September | | | | | | | | | | | | | | |
| Oktober | | | | | | | | | | | | | | |
| November | | | | | | | | | | | | | | |
| Desember | | | | | | | | | | | | | | |