He said this big weather event which has caused the extensive floods was on the back of record rain for the region during November and big falls again in December.

He said for the month of November Moree recorded 222 millimetres, setting a new monthly record, most of which fell from November 23-27.

This caused local flooding and inundated many parts of the Moree area.

In December another 135mm were record, followed by 131mm for January and so far this month a massive 173mm have been recorded.

For the past seven days Bellata has tallied 257mm, Mogil Mogil (north of Collarenabri) had 211mm, Moree 188mm, Narrabri West 221mm, Tamworth 176mm, Pallamallawa 162mm, and Bingara 174mm.

Since January 23 Moree has recorded 254mm and the Upper Horton in the upper Gwydir catchment more than 300mm.

Upper Horton graziers, Ian and Ali McDouall, at "Dunbeacon", have received 345mm since Wednesday, January 25, and haven't seen the sun in that period.

They say they have escaped major damage, but have received half their annual rainfall in that short period.

"I think even the ducks are not enjoying it," Mrs McDouall said.

Mr Glasson said the extraordinarily wet pattern was the result of a broad low pressure trough across north-east NSW and extending into Queensland combining with an upper level low pressure system which drew warm, humid air down from the Coral Sea.

However, this was expected to weaken during the course of today with a high pressure ridge developing on Saturday.

Storms were still expected from west of Tamworth to Orange, Nyngan and in the North West Slopes and Plains west of Inverell.

Isolated showers were also expected for these areas across the weekend and a cold front early next week was only expected to bring isolated showers.