Hi Phalpal,
I have always been told that they need cool temperatures around Xmas (your end of June
) as that is when the Spike is initiated in species that flower June/July/August here and Dec-Feb in the northern hemisphere. I'm sure there is some variation in dates depending on what month they flower.
But they do love cool nights of about 12C (~54F) every night if possible, it's meant to be good for their roots from what I've heard.
Kassey