Calculate number of hours with temperature higher then?

Hi.

I need to calculate number of hours with average temperatue higher then 7°C.
I can calculate avwrage temperature per hour (by using calculate node)
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But I dont know what next?
This node push one number every hour and when it push this number I need to compare it with number 7. If it is higher then 7, it will increase some auxiliary number by 1. That is my idea how it should work, but I dont know how to realize this.

Thanks for help or advice!

Hi.
Off the top of my head - add a second "calculate node" but only pass messages to it when temperature is > 7 (use a switch node to achieve this).