Melbourne Regional Office Weather Records (ASN00086071)

The annual mean temperature here has risen by 0.1 C (0.1 to 0.1) per decade over 1856 to 2014. In Fahrenheit: 0.2 F (0.2 to 0.2) per decade. The slope is a straight line fitted to 158 complete years; the brackets give its 95 percent interval.

Across 52 years with a frost, the median last spring frost at Melbourne Regional Office falls on 26 July and the median first autumn frost on 12 July, which leaves a median of 345 days between them.

Fitted over all years, the growing season changes by +1.9 days per decade at this station.

A day with at least 44.1 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 105.0 mm (4.1 in) of rain is expected about once in 100 years.

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 155 years of values from 1856 to 2010.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 113.4 mm (4.5 in) in 2005; 108.0 mm (4.3 in) in 1963; 99.6 mm (3.9 in) in 1954.

One change was suspected in the annual mean temperature of Melbourne Regional Office, at 1996. Each is measured against neighbouring stations.

• Relative to 5 neighbouring stations, the station's annual mean temperature from 1996 ran 0.2 C (0.4 F) higher than in the years before (likely change).