The Bureau has formally declared an Indian Ocean Dipole negative event, good news for those who want more rain over spring.

While Australian croppers are confident of a good year elsewhere crop prospects are rapidly declining due to either excess heat or floods.

Farming on the globe's driest continent all but the wettest of winters is unlikely to dent yield projections analysts say.

Records are being smashed as western Canada and the north-west of the US sizzle through what is being described as a 1 in 1000 year event.

The weather outlook all the way out to October is looking promising for those wanting more rain.

Better than anticipated rainfall last week delivered up to 50mm in areas desperately waiting for a seasonal break in Victoria and SA.

Rainfall of up to 15mm through cropping regions in Victoria and SA will be critical in getting crop established.

A weather station at Mt Baw Baw recorded a single day total the BOM believes is in the top 5 all time tallies for Victoria.

"We haven't put in a program with completely wet conditions in about five years."

There has been a final flourish to what had already been a wet May through much of the WA cropping belt, with heavy rain over the weekend.