Broome has recorded its hottest ever December since records began.
The Bureau of Meteorology has confirmed the daily maximum temperatures averaged 36.3 degrees, breaking the previous record set in 1951.
Forecaster Patrick Ward says it was an uncomfortably warm period throughout the West Kimberley.
"Broome airport scored it's hottest ever December, about two-and-a-half degrees above average, and hottest day for the month for 43 degrees on the ninth," he said.
"In terms of rainfall, about half the normal amount for a December."
Meanwhile, the Bureau's monitoring a monsoonal trough that will increase rainfall and the chances of cyclone activity over the next fortnight.
Forecasters say increased falls are likely across the Top End but it is not yet clear if the system will move south over the continent or remain offshore.
© ABC 2013
12:21 EST A series of cold fronts and a low pressure system will sweep over Tasmania during the next week, bringing showers on most days and keeping temperatures to those more likely to be experienced in winter.