Table 1.

Number of monitored nests observed for at least 30 days per breeding season, number of observations (no. nests × nights), number of nests with T_nest drops (difference between T_nest and T_a ≤ 7°C), number of nights with T_nest drops, percentage of nests with at least one T_nest drop and percentage of nights with T_nest drops.

year	no. observed nests	no. observations (no. nests × nights)	no. nests with Tnest drops	no. nights with Tnest drops	percentage of nests with at least one drop in Tnest	percentage of nights with Tnest drops
2010	24	1507	11	24	46	1.6
2011	34	2181	20	25	59	1.1
2012	43	3078	38	82	88	2.7
2013	43	3149	43	187	100	5.9
2014	50	3393	32	61	64	1.8
2015	48	3365	29	44	60	1.3
2017	48	3131	29	46	60	1.5
2018	41	2553	11	16	27	0.6