weather VS signal strength

Strange things are happening here at my site. 2 days ago temperature rised from -20degrees Celsius to -3degrees Celsius and I got signal strength drop from -69 to -74
What could cause such problems? Could it be because of atmospheric pressure or just humidity got into antenna?

I had already once that problem in december, but after some 3 days when temperature felt down bellow -10Celsius signal strength went back to -69?

how about snow? maybe some snow is blocking your antenna now. humidity and air pressure could all have effects too.

Yes, I have the same thing. Such things has happened a number of links. No snow. RB532, r52, ROS 3.30, 23dBi panel, 3km.
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dew points affect propagation (signal level)

Temperature affects noise (is part of the universal equation)

Check out this crazy link. It’s a 1.7 mile link, serious NLOS, XR9, 13db Yagi, 5MHz wide channel. Signal strength is all over the place.
wireless-noise.png
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This night again temperature felt bellow -20 degrees celsius and signal strength changed from -73 to -69 … and now I have 100Mbps HD again.