October 2016 was cold

Photo of the bark of a Eucalyptus tree

White Box at Sunset

In this month, each of five sunny spells of normal temperature was followed by a cold, cloudy, humid break, generally with rain. Only a few days were warmer than normal, including the 27th. That was the first 30° day of the season, five weeks late.
The average weekly temperature was persistently three or four degrees cooler than normal. One cold week about the 15th was more than five degrees below normal, and the warmest week, about the 29th, was still half a degree low.
Most nights were very cool. I recorded no frosts, but others may have done. My most recent frost was early in September.
There were six rain days, not counting two readings of 0.2 mm. The highest reading was 20.0 mm on the 23rd.

Weather log for October 2016

Comparing October months

This was the coldest October on this record from 1999. That includes not only the maximum, mean, and minimum air temperatures read in the Gill Screen, but also the subsoil temperature at 750 mm. Noting that October 2015 had the highest October temperatures, the sudden collapse is astonishing. Last October was three degrees warmer than normal; this month was almost three degrees colder than normal. Put another way, the seasonal warming is a month late this year and was a month early last year.
Unlike September, there was not an unusual amount of moisture in October. Humidity, cloudiness and daily temperature range were near normal.
The monthly rainfall total of 72.1 mm was above the average of 58 mm, in the 70th percentile.
I have discussed the current drought status (that is, drought-free) in another post.

Climate for October 2016

Data. Rainfall figures are usually from the automatic rain gauge at Manilla, published on the internet by the Bureau of Meteorology as Station 55031. However, the gauge ceased recording on the 8th of October, and later readings are from my non-standard gauge. All other data, including subsoil at 750 mm, are from 3 Monash Street, Manilla.

Fine cold days in July 2007

The daily weather logWeather log July 2007

Most days in July were cooler than normal. The first chart shows cold days persisted for more than a fortnight. The coldest, on the 16th, reached only 10.5°, which is 5° below normal. However, the weather was mainly pleasant, with more fine days and fewer cloudy days than usual.

There were warm nights at each end of the month, including one 7° above normal. In the middle, there were thirteen frosty nights in a row (below +2.2 degrees in the thermometer screen). The lowest temperature for the month was minus 4.4°. There were 17 frosts in total; far fewer than the 28 frosts of July 2002. (Note added in 2014: Up to, and including 2011, minima have been below minus 4° only sixteen times:  June 2000 (5), June 2002 (1), July 2002 (6), July 2003 (2) and July 2007 (2).)

With both days and nights being so cold, the weekly average temperature went as low as 4.7° below normal on the 17th.

There were seven rain days, which is normal, but the highest reading (on the 1st) was only 4.2 mm.

 Comparing July monthsClimate July 2007

This July had colder daytime maximum temperatures than any July in the last seven. Night-time minimum temperatures were also a bit on the low side. July 2002 stands out from the others. It had by far the lowest night-time temperatures in these years: three degrees below the average. Cloudiness was low in both 2002 and 2007.

The month’s rainfall of 9.0 mm is quite low, in the 12th percentile for July. However, there have been few dry months recently, so no totals for more than one month are as low as the 20th percentile.

Data. Rainfall data is from Manilla Post Office, courtesy of Phil Pinch. Dew point values before August 2005 are from Tamworth Airport 6 am data supplied by the Bureau of Meteorology. Temperature and other data are from 3 Monash Street, Manilla.


June 2007 had two very cold days

The daily weather logWeather log June 2007

This month had two remarkably cold days: 8.8° on Friday the 8th, just before Queen’s Birthday, and 8.3° on Wednesday the 20th. (Note added: in 2014 these stand as the coldest on the record from 1999.) Nearly all days were cooler than normal. Nights varied, with one above 10 degrees and 10 frosts. The weekly mean temperature was below normal except on the first and last days.
Nine days were completely overcast, and rain fell on 10 days (usually 6) with the highest reading 14.8 mm on the 4th.

The first very cold day was related to a severe “East Coast Low” (990 hPa) that caused widespread damage and major flooding in the Hunter region. Gales and high seas caused the freighter “Pasha Bulker” to run aground.

 Comparing June monthsClimate June 2007

The mean daily maximum (14.3°) and mean (8.8°) temperatures this month were much lower than in the previous six June months. The daily minimum (3.4°), however, was higher than last year (1.3°). (Note added. The maximum and mean temperatures stand in 2014 as record low values for June.)

The mean daily temperature range this June month (normally 15.0°) was extremely narrow: only 10.9°. (Note added. In September 2014, this stands as a record for any calendar month. The only other months with a mean daily temperature range narrower than 13° were all in late 2010 (expressing that La Niña event): July 2010, 12.3°; August 2010, 11.9°; November 2010, 12.4°; December 2010, 11.8°.)
With 60% of mornings having more than 4 octas of cloud, this was a very cloudy month. (Note added. The only month much more cloudy than this has been June 2013, with 75% cloudy mornings.)
The total rainfall of 65 mm is in the 78th percentile for June (June 2005, with 109 mm, was in the 96th percentile). Rainfall totals for more than one month show no shortages.

Note: Although there were brief reports in the “Manilla Express” dated 10/7/07 and 17/7/07, this report in standard format was written in 2014, with the benefit of hindsight. In particular, it uses normal curves that are based on data for the decade from March 1999 to February 2009.

Data. Rainfall data is from Manilla Post Office, courtesy of Phil Pinch. Dew point values before August 2005 are from Tamworth Airport 6 am data supplied by the Bureau of Meteorology. Temperature and other data are from 3 Monash Street, Manilla.