Under the Köppen climate classification system, Singapore has a tropical rainforest climate with no distinctive seasons, uniform temperature and pressure, high humidity, and abundant rainfall. Temperatures range from 22 to 34 °C (71.6 to 93.2 °F). On average, the relative humidity is around 90% in the morning and 60% in the afternoon. During prolonged heavy rain, relative humidity often reaches 100%. The lowest and highest temperatures recorded in its maritime history are 19.4 °C (66.9 °F) and 35.8 °C (96.4 °F).
May and June are the hottest months, while November and December make up the wetter monsoon season. From August to October, there is often haze, sometimes severe enough to prompt public health warnings, due to bush fires in neighbouring Indonesia. Singapore does not observe daylight saving time or a summer time zone change. The length of the day is nearly constant year round due to the country's position near the equator.
About 23% of Singapore's land area consists of forest and nature reserves. Urbanisation has eliminated many areas of former primary rainforest, with the only remaining area of primary rainforest being Bukit Timah Nature Reserve. A variety of parks are maintained, such as the Singapore Botanic Gardens.
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