Several record low July temperatures recorded

By Peter Nelson on July 03, 2017
  • Several record low July temperatures recorded

    Frost in Nathalia, Victoria over the weekend. IMG SOURCE: Sue McIntosh

Last weekend was noteworthy for record low July temperatures in Victoria and southern section of NSW.

Deniliquin recorded minus 5.6 on the Saturday and this was the lowest July temperature since minus 6.1 on 2nd July 1886. Hay recorded an all time record low for July of minus 6.1 on the Saturday 1st July ; then on the Sunday recorded a new record low for July of minus 6.3. Many places in NE Victoria recorded their lowest ever July temperatures including Rutherglen , Benalla and Wangaratta.

In southern Victoria, Bairnsdale recorded minus 5.4 easily an all time record low for any month in 75 years of records. The previous lowest overall being minus 4.5 in early August 1997. Canberra recorded it's coldest pair of July mornings since 1971.

Less than a week after the July 1971 event in Canberra, welcome heavy rain arrived in our regions and then the 1971 spring was much above average in rainfall.

Many places last month recorded their driest ever June not only in our region but also across the Nation. Victoria alone has experienced it's driest ever June in 110 years of records. Data recorded before 1908 were ignored unfortunately.

Only 11 mms was recorded in Victoria as a whole. The previous driest June in Victoria was 22 mms in 1944. That year was the driest on record across the Nation as a whole.

There were frequent dust storms the latter half of 1944 in Victoria and NSW and there were drought conditions until heavy rain arrived in January 1945. Perth had it's warmest June since 1949 whilst Hobart had it's warmest June since 1962.

Last month most places in our region had daily maxima slightly above the June normal whilst minima were well below normal by about three degrees. North of Dubbo, Coonabarabran had minima about one degree above normal, probably due to excessive rains on the NSW north coast and more easterly winds than usual.

It does appear that warmer than normal days will arrive by the end of July and continue into August and may last into September. I do wonder about the accuracy of AWS stations. Last Saturday whilst in Cobar the AWS station recorded minus 0.6. The MO station run manually recorded minus 5.5.

When I came outside in the early morning my car was coated with thick ice and my push bike parked nearby had a coating of ice on the frame. The MO reading is obviously more correct.

Some AWS stations have lost some recordings due to technical failures and there has been no backup to recover lost readings.

By Peter Nelson on July 03, 2017

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