All rights reserved. Some regularly received questions and answers to these. Some of the archived data seem to have errornous values. The data are used for teaching. These very high values indicate an instrumentation problem.
Relative humidity is derived from the dry and wet bulb temperatures.
The high values occur because of a problem with the wet bulb temperature. If not wet enough will read too high and so RH too great. The time is the local standard time in Sydney. Although, according to Precision Timing Word list and Meteorological Glossary this should simply be called standard time. The local is added here to emphasis that it is the standard time for Sydney, Australia.