Rainy Cool March 2013

The daily weather logWeather log March 2013.

Days and nights were cooler than normal until late in the month. The first day was the coldest: 22.2°. March began with 31 mm of rain on the 1st, and 45.4 mm on the 2nd, but little fell later.

 Comparing March monthsClimate March 2013.

In most ways, the month was like March last year: a bit cool, particularly in the day-time, but warm in the subsoil, and rather cloudy, but not humid. However, there was much more rain.

The total rainfall (84.6 mm) was in the 80th percentile, far above the mean of 53.3 mm. Rainfall totals for groups of months (2 months up to 360 months) are now all above their median values. The 36-month total of 2328 mm is extremely high, near the 36-month record of 2662 mm set in October 1998.


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 February 2013

Parametric plots of smoothed climate variables at Manilla

“Suddenly colder”Trends to February 2013.

Temperatures, both max and min, fell from very high in January to very low in February. Daily temperature range and rainfall remained normal. Dew point remained very low, while cloudiness and subsoil temperature remained high.

Winter 2012

Fully-smoothed data (in red) reveal that the trend in winter, as in autumn, was towards “droughts” (top right) for all variables except subsoil temperature (which peaked). Mean values over winter, however, were very different:
* Subsoil temperature: very high;
* Cloudiness and temperature range: rather high;
* Maximum temperature and rainfall: normal;
* Minimum temperature: rather low;
* Dew point: extremely low.
In August, dew point anomaly again reached a new record low: -3.21 degrees.

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.

Cool February 2013

The daily weather logWeather log February 2013.

Hardly any days or nights in February were warmer than normal. The daily maximum temperature of 23.6° on the 2nd was 10.1° below normal. (But one day in February 2009 reached only 17.8°!) The weekly mean temperature remained below normal by between one degree and five degrees.
Sunny days with low humidity came mainly early in the month. There were seven rain days (normal), but the highest reading was only 16.4 mm, on the 24th.

 Comparing February monthsClimate February 2013.

Mean maximum, minimum, and mean temperatures were low, like last February, but not quite as low as February 2008. As a rule, February in Manilla is practically as hot as January, but this time it was 6 degrees cooler.Record low morning dew points show the air was very dry, which is strange when there was more than usual cloud and rain.

The total rainfall (58.0 mm) was in the 56th percentile, just below the mean of 66.8 mm. Among rainfall totals for groups of months, only that for 12 months (490 mm) is below the median value.


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.

 

March 2012 a bit dry and cool

The daily weather logWeather log March 2012

Apart from a cold snap about the 9th, March was just a little cooler than usual. There were four rain days, with a maximum reading less than 7 mm. Late in the month, the weather was showery, but none of that rain fell here.

 Comparing March monthsClimate March 2012.

All the mean temperatures, and the Dew Point, were about a degree low. However, this month was not nearly as cold or as dry as March 2008, which had only 2.2 mm of rain, and barely escaped a frost.
The month was very cloudy, but not as cloudy as last year. The subsoil was very warm.
The rainfall total of 15.4 mm is well below the March average of 53.3 mm. It is in the 26th percentile: about one quarter of all March months have been drier than this one. This rather low reading hardly affects the high totals for groups of months. Totals for periods from five months to twenty-four months are still near record high values. No totals up to the thirty-year total are below normal.


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.

 

February 2012 very wet

The daily weather logWeather log February 2012.

As in December and January, nearly all the days and nights of February were cooler than normal. No days went over 35°, and no nights over 20°. Wednesday the 1st reached only 18.5°, which is 15.3° below normal! Rain that began three days earlier, totalled 145.2 mm by the 4th : one-fifth of a year’s rain in seven days! However, there was no flooding.
In all, February had 11 rain days, totalling 196.3 mm, with 73.2 mm on the 2nd.

Comparing February monthsClimate February 2012.

While this month’s mean daily maximum temperature was nearly 3° below normal, February 2008 was cooler on all measures.
The Dew Point was again low: very dry air persists, despite cloudy skies and extreme rainfall.
The rainfall of 193.6 mm is in the 97th percentile for February, the fifth wettest in 129 years. As this combines with the November deluge, rain totals for groups of 4, 5, and 6 months have near-record values: 4 months: 576 mm (3rd wettest); 5 months: 674 mm (4th wettest); 6 months: 765 mm (3rd wettest). Total rainfalls for longer periods, up to 30 years, are now all well above average.


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.

Cool, very cloudy January 2012

The daily weather logWeather log January 2012.

As in December, nearly all the days and nights of January were cooler than normal. Normally, about twelve days are warmer than 35°, but this time only three were. Sunday the 15th reached only 23°, which is 11° below normal. There were eleven rain days, but the highest rainfall reading, on the 25th, was only 11.2 mm.
The month ended with eleven cloudy mornings in a row. Seven mornings in the month were overcast.

Comparing January monthsClimate January 2012.

All mean temperatures and the Dew Point were lower than in other Januaries shown on the second graph. They were also the lowest on the 13-year record, except that January 2000 had a lower mean minimum of 15.5° and Dew Point of 12.4°. This month’s mean maximum was 3.7° below normal. This extremely low value does not match December’s, which was 4.6° below normal.
Subsoil temperature was not low, but normal. This made the subsoil more than 2° warmer than the air, which is unusual in January.
Fifty-five percent cloudy mornings is a new record for January, and twice as cloudy as usual. Due to that, the mean daily temperature range (13.8°) is near the January record narrow value: 13.7° in 2008.
The rainfall of 60.7 mm is in the 40th percentile for January, well below the long-term average of 86.7 mm. Due to the November deluge, rain totals for groups of months from 3 months up to 24 months remain very high indeed: above the 80th 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.

Very cool December 2011; wet year

The daily weather logWeather log December 2011.

Nearly all the days and nights of December were several degrees cooler than normal. None of them were very cold, but no days and few nights were above normal either. As in much of NSW, cool weather continued for the whole month. In a normal December, most days are warmer than 30°, but this time only four were. There were eleven rain days, often with cloud on the hills and sometimes valley fog (in summer!). The highest rainfall (2 day) reading was 22.0 mm.

 Comparing December monthsClimate December 2011.

This December was even cooler than the last. It set new post-1998 record lows for mean daily maximum temperature (27.0°), mean daily mean temperature (20.4°), and mean daily minimum temperature (13.9°). This December’s days and nights were cooler than those of November, by 2.8° and 2.1° respectively.
Mean early morning Dew Point (11.1°) was also a record low value.
The mean daily temperature range (13.2°) was a bit wider than last years record narrow value (11.7°). The sky was rather cloudy, and the mean subsoil temperature (24.0°) normal.
The rainfall of 79.0 mm is in the 58th percentile for December, above the long-term average of 74 mm. Totals for groups of months up to 24 months are now all extremely high: above the 80th percentile. The greatest rainfall “shortage” is in the 12-year total, which has the lowest percentile value (41st percentile): in the last 12 years 7621 mm of rain fell, which is just 82 mm short of the median 12-year total of 7703 mm.

The year 2011

After a very dry winter, record-breaking spring rain made this an extremely wet year. The rainfall for the year, 839 mm, is in the 86th percentile. It was not quite as wet as 1998 (919 mm; the 6th wettest) or 1996 (890 mm; the 10th wettest). These three years (1996, 1998, 2011) are the wettest in the third of a century since 1978, which had 979 mm.
In other ways, the year was nearer to normal than 2010. There were 91 rain days, fewer than last year’s record 112 rain days. It was much less cloudy, which allowed days to become warmer and nights cooler than last year, when the climate had been more equable: like that on the coast.


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.