VICTORIA'S wettest spring since 2001 has revived northern irrigators' optimism, pushing allocations to 57 per cent on the Murray and 46 per cent on the Goulburn irrigation systems.

But the warmest November on record has also cut short irrigators' hopes of any more major allocation gains this season.

Lake Eildon inflows dropped from 200,000 megalitres in October to just 45,000 megalitres in November and the Murray system's Dartmouth Dam inflows fell from 126,000 megalitres to 40,000 megalitres.

Goulburn Murray Water corporation acting resource manager Mark Bailey said the warm November dried out the catchments and reduced inflows.

The Bureau of Meteorology's preliminary analysis shows November was 4.4C warmer than average, which in turn lifted the spring average to a record high.

September temperatures were only 0.9C above average, with October bang on average.

BOM climatologist Blair Trewin said the warm conditions followed the long-term warming trend of 0.8C in the past 100 years, which led to more warm extremes.

As for rainfall, Dr Trewin said Victoria's average was 4 per cent above average.

"Looking across the state, the Mallee has been the most significantly above average," Dr Trewin said.

The BOM's spring rainfall maps show western and north-west Victoria recorded falls 25-50 per cent above average, with the central Mallee receiving up to twice its average rainfall.

Ballan farmer John Sheahan said about 100mm had fallen on his property in the past week.

"It's not doing much damage to the grain, but it will give the pasture a push," Mr Sheahan said. "It's good for the livestock farmers."

Victoria's North East received 25-50 per cent above average falls for spring, with the south-west close to average. Dr Trewin said Gippsland had been particularly dry.

"If we look at the last 12 months, most of central and East Gippsland has been particularly dry," he said.

But while most Victorian farmers enjoyed an average to wet spring, their southern and central NSW counterparts are suffering spring rainfall deficits of 40 to 60 per cent below average.

"NSW has missed out on most of the rain we had in the last 10 days," he said.