If the solar rays fall on the thermometer, mounted outside window frame, it heats up and shows… its temperature, not the ambient air.
To avoid this, protect the thermometer shade cover that can be cut from a suitable plate an opaque plastic (e.g. from a milk bottle) or foam containers: they will take over the sun’s rays.
Recommend to read
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European Nazi Empire, Germany and Italy, showed a coincidence of interests on many issues. Was no exception and the construction of a naval fleet. Both the "leader" — Hitler and... - “GLISSER” ANGLER
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