Evaporation cools because the water taking away our field's heat feels like a blessing when the loo winds blow, eche. The four factors are temperature, wind speed, humidity, and surface area, which I know well—we wet the kacha bricks on our house walls to cool the rooms. But I disagree that wind always speeds it up; sometimes a hot, dusty wind just bakes the moisture right into the air before it can cool the soil, thawai. I see this when irrigating my onion crop at noon, watching the water vanish too fast to help the plants.
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