Malaita's climate is extremely wet. It is located in the Intertropical Convergence Zone ("Doldrums"), with its fickle weather patterns. The sun is at zenith over Malaita, and thus the effect is most pronounced, in November and February. Trade winds come during the Southern Hemisphere's winter, and from about April to August they blow from the southeast fairly steadily. During the summer, fringes of monsoon blow over the island. Because of the surrounding sea, air temperatures are fairly consistent, with a difference between daily highs and lows averaging to 13.6 °F However, across the year, the difference is much less; the mean daily temperature in the warmest month is only 3.4 °F warmer than that of the coolest. Rainfall is heavy and there is constant high humidity. The most common daily pattern follows an adiabatic process, with a calm, clear morning, followed by a breeze blowing in from higher pressures over the sea, culminating in a cloudy and drizzly afternoon. At night, the weather pattern reverses, and drizzle and heavy dew dissipate the cloud cover for the morning. Tropical cyclones are the only violent weather, but they can be destructive.