Tag Archives: climate

December 2013: air still dry

Posted in Manilla NSW, Monthly weather by

The daily weather logWeather log December 2013.

The month began cool, including two nights at 6.9°, the coldest December nights in this record. Later it became very warm, with one night of 24.0° and one day of 40.2°. Spells of sunny weather were separated by five rainy days.
The relative humidity on the afternoon of the 29th was the record low value of 4%, as on 10/1/13 and 13/8/13. (These values may be wrong. Few hygrometers can be read so low.)

Comparing December monthsClimate December 2013

This December was warm: just slightly cooler than December last year, and very much warmer than those of 2010 and 2011. Extremely dry air brought a new record low December mean morning dew point of 8.8°.
Subsoil temperature (25.7°) remained 1.5° above normal.
The total rainfall of 45.6 mm was in the 28th percentile, well below the average of 74 mm. However, there are still no serious shortages in rainfall totals for more than one month.

The Year 2013

This was one of the warmer years in the new century (but much cooler than 2009). It had the driest air, with a mean early morning dew point of 5.4°, 1.5° below average. The air has become drier each year since 2010.

This year also had the highest subsoil temperature: 22.1°, 1.9° above average.
Extremely high rainfall in June (98mm) was balanced by very low rainfall in August (6.4mm) and October (15mm), for a low annual total of 576 mm, in the 37th percentile.

Data. Rainfall data is from Manilla Post Office, courtesy of Phil Pinch. Temperatures, including subsoil at 750 mm, and other data are from 3 Monash Street, Manilla.

Spring 2013 hot and dry

Posted in Manilla NSW, Season Weather by

 

Weather log spring 2013.Through most of this spring season, days were hot and sunny, and the humidity and dew point were very low. This changed for the final three weeks, when two-thirds of the season’s rain fell, and the weather was cool and humid.
Along with 2002 and 2009, this was one of three hot springs this century. However, this spring had cooler nights. The springs of 2002, 2012 and 2013 were the driest, counting humidity and cloud as well as rainfall. This spring had the lowest humidity by far, and last spring the second lowest. Low humidity means crops and animals (and people) need more water.
The total rainfall (130 mm) was in the 36th percentile for springs. Rain fell on only 13 days: more than in spring of 2002 (9 days), but fewer than in 2003 (15) or 2012 (16).Climate spring 2013

Data. Rainfall data is from Manilla Post Office, courtesy of Phil Pinch. Temperatures, including subsoil at 750 mm, and other data are from 3 Monash Street, Manilla.

3-year trends to November 2013

Posted in 3-year climate trends, Manilla NSW by

Parametric plots of smoothed climate variables at Manilla
“Less droughty”

Trends to November 2013.

Most raw anomaly values (orange) for November climate variables remained on the “drought” side of normal, but less extreme than in October. As an exception, rainfall was very high.

Fully-smoothed data points (red) for autumn (MAM) of 2013 show a climate that was normal in the context of the decade beginning April 1999. Anomalies were high cloudiness, low dew point and warm subsoil. The last fully-smoothed data point, for May 2013, moved towards drought.

Note:
Fully smoothed data – Gaussian smoothing with half-width 6 months – are plotted in red, partly smoothed data uncoloured, and raw data for the last data point in orange. January data points are marked by squares.
Blue diamonds and the dashed blue rectangle show the extreme values in the fully smoothed data record since September 1999.

Rain came back in November 2013

Posted in Manilla NSW, Monthly weather by

The daily weather logWeather log November 2013

By November the 11th, there had been only 70 mm of rain since the deluge in June. The humidity had been getting lower by the month. From that day, rain and high humidity returned. Days and nights became cooler than normal, with more cloudy skies. Most of the seven wet days were showery, but the 29th had steady rain.

Comparing November monthsClimate November 2013.

The weather change on the 11th returned most monthly average values closer to normal. However, despite the rain, this was still an “Arid” month, with a record low November mean morning dew point, a wide daily temperature range, and few cloudy mornings. The mean subsoil temperature (23.8°) was 1.9° above normal, exceeded (in the 21st century) only by 24.7° in November 2002.
The total rainfall of 95.6 mm was in the 80th percentile, well above the average of 67 mm. This disposes of all serious shortages in rainfall totals. The worst figure now is the 5-month total of 166 mm, which is 56 mm below normal (19th percentile).

Data. Rainfall data is from Manilla Post Office, courtesy of Phil Pinch. Temperatures, including subsoil at 750 mm, and other data are from 3 Monash Street, Manilla.

3-year trends to October 2013

Posted in 3-year climate trends, Manilla NSW by

Parametric plots of smoothed climate variables at Manilla
“Even more arid”Trends to October 2013.

Of the raw values of climate anomalies in October 2013, daily maximum temperature, among others, fell back from the extreme high reached in September. However, rainfall and dew point became extremely low, and temperature range extremely wide, suggesting extreme drought.

Anomalies of fully-smoothed points for April 2013 were mainly near zero, like those of March. That is, the climate was quite normal.

Note:
Fully smoothed data – Gaussian smoothing with half-width 6 months – are plotted in red, partly smoothed data uncoloured, and raw data for the last data point in orange. January data points are marked by squares.
Blue diamonds and the dashed blue rectangle show the extreme values in the fully smoothed data record since September 1999.