Table 2. The daily average of air temperature (Ta, °C), relative humidity (RH, %), Temperature-humidity index (THI) and photoperiod during the study period

Item	May	June	Mean	SEM	p-value
THI	62.58	68.82	65.65	0.60	< 0.001
Ta (°C)	17.52	21.92	19.68	0.41	< 0.001
RH (%)	67.31	64.98	66.01	1.45	0.372
Photoperiod (hh:mm)
Daytime	14:07	14:38	14:22	0.00	< 0.001
Nighttime	9:52	9:21	9:37	0.00	< 0.001