Phenological responses to climate change are known to differ between bird species, and even differences within species are known to occur, but are rarely considered. With data sets comprising 22 years of bird ringing records (1990-2012) and focusing on differences between populations, sexes and individuals in different migratory phases, we investigated migratory change in willow warblers (Phylloscopus trochilus spp.) at one northern and one southern site in Sweden. In order to investigate effects of climate on changes in arrival and departure dates, three climatic variables were included in the analysis (local temperature, regional growing season onset, GSO, and the North Atlantic Oscillation, NAO). At the northern site there was no change in onset of autumn migration, whereas both spring and autumn migration advanced at the southern site. Of the climate variables, only September temperatures and the GSO showed a change, and the latter advanced at both sites by 0.3-0.6days/year. Analyses revealed that a combination of GSO and the NAO, acting together with local spring temperatures, not only displayed positive relationship with early arriving individuals in spring at the southern site, but also with early departing juveniles in autumn at the southern site. These correlations indicate that spring migratory phenology may resonate through life-history events and affect phenological steps during the entire breeding area residence. As migratory changed differed between the latitudinally separate locations during autumn even though GSO showed similar advancement in both regions, we propose that local adaptation may prepare individuals differently in reacting to environmental change. Our results corroborate that phenological response to climate change is not uniform within a species and that it in fact appears to be restricted to certain individuals.