ACT State of the Environment 2007

Indicator: Weather – Relative humidity

See also: | Rainfall | Temperature | Sunshine | Evaporation | Wind |

Figure 1 provides the trends in 3.00 pm relative humidity over the reporting period. As relative humidity is temperature dependent and changes during the day, the 3.00 pm value has been selected as it is the closest measured value to the time of maximum temperature when the greatest difference between the two values tends to occur. There appears to be a drying trend over this period with 2006 being significantly drier than average. On a monthly basis, 2003 was close to average in all months, 2004 was below average for most of the year while 2005 was more humid for the latter six months. The dry years of 2004 and 2006 also reflect the lack of rainfall in these years.

Figure 1: Trends in mean 3.00 pm relative humidity at Canberra International Airport 2003–07

Three graphs showing trends in mean 3.00 pm relative humidity at Canberra International Airport 2003 to 2007

Source: Bureau of Meteorology

Long-term trend

The general decrease in relative humidity in recent years is consistent with the lack of rainfall experienced over this period (Figure 2 ).

Figure 2: Long-term trends in mean 3.00 pm relative humidity at Canberra International Airport, 1940–2007

Three graphs showing trends in mean 3.00 pm relative humidity at Canberra International Airport 1940 to 2007

Source: Bureau of Meteorology

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