Information from the Statistics and Census Service (DSEC) indicated that the annual mean air temperature in Macao edged down by 0.2 ºC year-on-year to 22.8 ºC in 2018. The highest temperature of the year was 35.8 ºC in May, down by 2.2 ºC year-on-year, marking the hottest May since 1952; meanwhile, the lowest temperature was recorded in February at 4.6 ºC, down by 2.5 ºC year-on-year. Total precipitation was 1,795.6 mm, a slight increase of 12.4 mm year-on-year.
There were 7 tropical cyclones in 2018. Typhoon signal No.10 was hoisted when Typhoon Mangkhut hit Macao, which was in effect for a record high of 9 hours; a maximum gust of 188.6 km per hour and a maximum 10-minute average wind speed of 137.2 km per hour were recorded; moreover, the maximum tide level reached 5.2 m.
As regards air quality, number of "Good" air quality days recorded by each monitoring station in Macao in 2018 was generally higher than that in 2017; meanwhile, all monitoring stations, except the ambient monitoring station in Taipa, showed a significant decrease in the number of “Poor” air quality days, indicating an improvement in air quality. In 2018, there were 39 days with acid rain.
Total water consumption was 90,944,000 m3, up by 2.8% year-on-year. Water consumption by the business sector (46,899,000 m3), households (38,283,000 m3) and the government sector (5,762,000 m3) increased by 3.4%, 2.4% and 1.4% respectively year-on-year. The Waste Water Treatment Plants treated an average of 223,360 m3 of waste water per day, up by 5.9% year-on-year.
The Refuse Incineration Plant treated a total of 522,548 tonnes of municipal solid waste, a year-on-year increase of 2.3%; volume of construction waste sent to landfill decreased by 31.5% to 2,010,000 m3.
Attributable to the inclusion of the New Urban Zone Area A and the Macao boundary crossing area of the Hong Kong-Zhuhai-Macao Bridge, the land area of Macao increased by 2.1 km2 year-on-year to 32.9 km2 in 2018. The population density went down from 21,100 persons per km2 in 2017 to 20,000 persons per km2 in 2018.