severe frosts in coffee-growing nations

It's a thin film of ice formed from condensation such as fog or dew.

The real issue for growers in temperature, not whether conditions are right for frost to form. I live in a very dry area. We have temperatures low enough to kill most growing crops, but there often is not enough moisture for frost to form.

aha ....cool

I also found a situation here
http://www.alaska-in-pictures.com/data/media/19/winter-scenic-with-hoar-frost_1977.jpg

hopefully , this is the thin film of ice formed from condensation such as fog or dew. yea, truly crops can not grow in this bad weather environment...I think thats the reason coffee grow suffered and hence price increased.

by the way , do you know the origin of this word ? It seems its a mixture of two words.

frost = fog + roast // some sort of this but I know I'm wrong

whats the correct version ?

I am clueless on the origin, but I too suspect this isn't it.

The Earth has a way of eliminating what she doesn't need. Yes, we needed caffeine to spur our energy levels when we found ourselves in dire straits and it could be said we needed that "boost" of energy to supply us with all we needed to "fix" us. It could be she is telling us to level out for that energy we are expending is not needed anymore and she is being more sparing in her distribution of it.

William

And this has exactly what to do with frost?

Frost is the solid (Ice) deposition of water vapor from saturated air. It is formed when solid surfaces are cooled to below the dew point of the adjacent air as well as below the freezing point of water. Frost crystals' size differ depending on time and water vapor available.

I melt the frost off my car windscreen most mornings.

'frost/frosts' refers to freezing temperatures. It doesn't necessarily have to include any accumulations of actual frost/rime or ice on the plants in question.