Weather effects

[HOTEC]

The Eff(final) comprises Eff(current) and Eff(recovery).
My understanding of the Weather Effects in the manual should be:
Snow condition:
Eff(final) = Eff(current) + Eff(recovery) * 0.9
Blizzard condition:
Eff(final) = Eff(current) + Eff(recovery) * 0.8
The unit's effectiveness should be slow in recovery during snow or blizzard turns but should not have any reduction.
My unit reduced its effectiveness from 95 to 85 during a snow turn.

I guess it may be
Eff(final) = { Eff(current) + Eff(recovery) } * 0.9

[AlvaroSousa]

Every turn units lose effectiveness (using supplies)
Each turn they recover from supply lines
Weather impacts their recovery.

Snow and Blizzard affects everyone really bad, except USSR and Finns.

Just know that it is harder to recover effectiveness in the snow and blizzard, especially the latter.

I forgot the exact formula.