Rigger, your right about the misty type of rain. It was a significant increase in my opinion. Thanks

 

@subnivean: how do you know the precise wind speed and direction? installed some devices????

 

I wish! No, I just check out a weather site (like wunderground.com), where they give a 3-times-an-hour history of things like wind speed and direction, temp, etc.

It's also a good way to get an 'average' temp for a tank - they let you put in a range of days, and give you a mean temp for that period. Since I leave when it's coldest and return when it's warmest, I figure that's close enough.