<prompt> Isigaba: Amahlathi emvula asezindaweni ezishisayo angachazwa ngamagama amabili: kushisa futhi kunomswakama. Izinga lokushisa eliphakathi nenyanga lidlula i-18 C 64 F kuzo zonke izinyanga zonyaka. Isilinganiso semvula yonyaka asikho ngaphansi kuka-1,680 mm 66 in futhi singadlula i-10 m 390 in yize imvamisa iphakathi kuka-1,750 mm 69 in no-3,000 mm 120 in. Leli zinga eliphakeme lemvula livame ukuholela enhlabathini empofu ngenxa yokuchitheka kwezakhi ezincibilikayo emhlabathini. Umbuzo: Ngaphansi kwaliphi izinga lokushisa elingalokothi lehle unyaka wonke?  <response>: 18 C 