"Current conditions show Northland is such an unusual area to farm in, but it's worth pointing out that each El Nino affects regions quite differently," she said.
Ms Jonker said the trust had been discussing the effects of El Nino with other stakeholders since September which meant farmers were better prepared this time.
"A lot of them, especially beef farmers, are quite proactive and haven't increased their stock and they've also been making plenty of supplement."
Kokopu dairy farmer Denis Anderson said most of the region's farmers were pretty much set up for summer but needed showers to keep them going and to avoid "rogue" easterlies.
"It's wise to hedge your bet a little bit.
"In February and March or even late January we can get easterlies coming through and they can make it difficult."
NIWA has also released its monthly climate summary for November which revealed parts of central Northland recorded temperatures which were 0.51C to 1.20C above the month's average.
Kaikohe featured prominently as the town recorded the highest mean air temperature at 16.7C and the mean maximum air temperature at 21.1C since records began in 1973.
Similarly, Kaikohe had the highest daily maximum air temperature (25.8C) since records began in 1973.
Whangarei joined Kaikohe in recording the highest daily minimum air temperature at 19C and 18.5C respectively.