Table 1 Climate data for both experimental sites including 30-year average climatic conditions.

Climatic metrics	Wexford			Zürich
Climatic metrics	30-year avg.	2013	2014	30-year avg.	2012	2013
Annual precipitation (mm)	1025	888	1138	1019	1165	1028
Summer precipitation (mm)^ǂ	231	138	199	330	473	220
Summer precipitation (% of 30 year)^ǂ	—	60	86	—	143	67
Total precipitation excluded (mm)	—	94	166	—	247	144
Annual precipitation excluded (%)	—	11	15	—	21	14
Summer precipitation excluded (%)	—	68	83	—	52	66
Mean annual temperature (°C)^†	10.4	10.0	10.6	9.5	9.8	9.4
Mean summer temperature (°C)^†	14.8	15.3	15.0	18.0	18.5	18.8

Notes: The 30-year average climate values were calculated for the period 1983 to 2012 at both sites from meteorological stations situated not more than 1.4 km from the experimental locations. ^†Reference period for average temperature was from 1994 to 2012 at Wexford, ^ǂsummer defined as June–August.

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