Data from: Variation in laying date in relation to spring temperature in three species of tits (Paridae) and pied flycatchers Ficedula hypoleuca in southernmost Sweden

All laydateFile All laydate: Year = year Sp = Species 1 = Marsh tit; 2 = Blue tit; 3 = Great tit; 4 = Pied flycatcher Reg. = Region 1 = Revinge; 2 = Linnebjer; 3 = Vomb; 4 = Dalby Norreskog; 5 = Frueräften; 6 = Kungsmarken Temp = Mean ambient temperature for the 30 d preceding the mean laying date for each species and year Date = Laying of the first egg in a clutch; 1 = 1 April Anno = Year since the first year in the study; 1 = 1969