Field Notes Journal

Seasonal Analysis and Species Classification

Chiffchaff

Model Family : Seasonal presence

Summary

Chiffchaff

Extended spring seasonal presence

Chiffchaff is classified as extended spring seasonal presence. The fitted seasonal window runs from about March to July, with a spring peak around April. The season is broad, with a sharp active window, moderate post-peak decline, and strong off-season suppression.

Confidence
Medium
Peak
April
Season
March–July

Seasonal wheel

Seasonal wheel for Chiffchaff Chiffchaff Peak: April

Calendar strip

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Highlighted months indicate stronger modelled presence or detectability. A ring marks the fitted peak; a hollow mark indicates the trough where available.

Classification evidence

Season start month
3.015
Season end month
7.445
Forcing peak month
4.385
Season width months
4.43
Season midpoint month
5.23
Season start label
March
Season end label
July
Forcing peak label
April

Observed and Simulated Seasonal Patterns

Chiffchaff Observed Presence, Abingdon
Chiffchaff Observed Presence, Abingdon
Chiffchaff Observed Totals, Abingdon
Chiffchaff Observed Totals, Abingdon
Chiffchaff Simulated Presence, Abingdon
Chiffchaff Simulated Presence, Abingdon

Cite this dataset

You are welcome to reuse or reproduce this material under the terms of the Creative Commons CC BY 4.0 licence but please cite it using the reference below, include a link to the licence, and indicate if any changes were made.

Walker, David. Chiffchaff. Field Notes Journal. ID FN-WL-SEASONAL. Version 2026.05.21. https://fieldnotesjournal.uk/wildlife/seasonal/abingdon/chiffchaff.html

Dataset FN-WL-SEASONAL Author David Walker Publisher Field Notes Journal Version 2026.05.21
Reference: Walker, David. Chiffchaff. Field Notes Journal. ID FN-WL-SEASONAL. Version 2026.05.21.

BibTeX 
@dataset{fn_wl_seasonal,
  author = {Walker, David},
  title = {Chiffchaff},
  year = {2026},
  publisher = {Field Notes Journal},
  version = {2026.05.21},
  url = {https://fieldnotesjournal.uk/wildlife/seasonal/abingdon/chiffchaff.html}
}