When is dew due?

Country Life Every Week - - In The Garden -

Spring and au­tumn—but es­pe­cially spring—are when dews are com­mon­est, be­cause this is when the rel­a­tive tem­per­a­ture dif­fer­ence be­tween the (cooler) ground sur­face and the (warmer) air is great­est. How­ever, dews can ap­pear any day of the year.

Its heav­i­ness also de­pends on the hu­mid­ity of the air mass in­flu­enc­ing the UK at the time (sea air car­ries much more mois­ture than dry Con­ti­nen­tal air) and if there is any breeze. A very light sur­face wind can make dew heav­ier, by caus­ing tur­bu­lence that brings down fresh, moist air to re­place air from which wa­ter vapour has al­ready con­densed.

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