Tag Archives: Gaussian smoothing

Warm Nights in Summer 2009-10

Posted in Manilla NSW, Season Weather by

 

Weather log summer 2009-10

No warm spell this summer matched that of late November, which had four days over 40°. There was only one 40° day all summer. By February there were no warm spells.
Summer began hot and very dry, with clear skies and low humidity. Year’s end saw days of rain, low cloud and extremely high humidity. In mid-January the air was again very dry, but cool.

The mean daily maximum temperature was normal, but the mean minimum (18.7°) was the highest in eleven summers. The number of nights warmer than 20° (34) is also the highest, nearly twice the usual number.
The total rainfall of 190 mm is below the long-term summer average of 225 mm. It is in the 42nd percentile.
At 42% cloudy mornings, this summer was very cloudy, but not extremely cloudy like the summer of 2007-08 (53%). These summers shared the record for completely overcast mornings, with 18 each.

Climate for summer 2009-10

 

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 2009 warm and dry

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Weather log spring 2009

This spring was warm and dry, partly due to the extreme heat wave in the final two weeks. In that period, records were broken for the highest temperature in any month: highest daily maximum (42.6°), highest daily maximum temperature anomaly (+13.5°), highest daily minimum (27.8°), and highest weekly average (31.3°).

Compared to decade averages, the mean maximum (28.4°) was up 2.1° and the mean minimum (11.7°) up 1.3°. For dryness, the morning Dew Point (6.0°) was down 1.5°, and cloudiness (29%) down 1%. Although this spring was very warm and dry, spring 2002 had been much warmer and drier. Values then were: max 29.2°, min 12.1°, Dew Point 5.4° and cloudiness 19%.
In spring 2002 there had been only 66 mm of rain: the fifth lowest on record. Rainfall this spring was 121 mm. Similar spring totals were seen in 2007 (122 mm), 2006 (139 mm), and 2003 (125 mm). These values are on the 30th percentile (which is not very low), but seem low compared to recent extremely wet springs in 2008 (295 mm), 2005 (260 mm) and 1999 (262 mm). The long-term spring median is 156 mm.

Climate spring 2009

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.

Winter 2009 was very warm and dry

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Weather log winter 2009

Daily maximum temperatures were mainly above normal throughout the season, except in the second week of June and in mid-July. The values of 31.8° and 30.5° on the 23rd and 24th of August were the hottest winter days in this 11-year record. Many such records were set at that time in Central Australia, southern Queensland and northern NSW. Similarly, daily minimum temperatures were mainly above normal, except in early August. The night-time minimum of 18.2° on 25/8/09 was 2° warmer than the warmest previous winter minimum of 30/8/04.
Early morning Dew Points remained a degree or two below the daily minimum temperature through June and July. In August, they remained low while the temperature soared, so that the air became uncomfortably dry.
There were 20 rain days (usually 18). Most rain came early in the season, with the maximum daily reading only 13.2 mm.
Cloudy mornings declined sharply during the season: June had 60%, July 45%, and August only 29%

Of the last eleven winters, this was the warmest. The daily mean temperature, 11.8°, was 1.2° above normal. The daily minimum, 4.5°, was also the warmest, but the daily maximum, 19.1°, did not reach the 19.2° of winter 2002.

This winter was one of the least frosty, with 39 frosts rather than the usual 44. There was only one reading below minus two, while other winters had from three to nineteen! The mean Dew Point of 1.7° was normal for winter.
The rainfall total of 65 mm is well below average for winter (125 mm). It is in the 13th percentile, much wetter than winter 2002 which, at 45 mm, was in the 7th percentile.
This was the second cloudiest winter of the decade. Forty-six percent of the mornings had more than 4/8 cloud. Last winter was a little cloudier, at 48%.

Climate winter 2009

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

Cloudy Autumn 2009

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Weather log autumn 2009

Temperatures cooled as normal in autumn, with few unusual features. Through early March and early May nights were cold, humidities were low, and skies were clear. Later in May, nights were very warm.
There were 16 rain days, which is more than normal (12), but most had very low readings. One rain day in April (36 mm) brought nearly half the season’s rain.

As in the summer, all mean temperatures (daily maximum, mean, and minimum), as well as the morning Dew Point, were normal. Neither of the previous two autumns had been normal: autumn 2008 was very cool and arid; autumn 2007 was very warm and humid.
The total rainfall of 81 mm is on the 30th percentile for autumn. It is 32 mm below the autumn median rainfall (113 mm).
At 33% cloudy mornings, this autumn was the cloudiest of the decade. Autumns average only 25% cloudy mornings, compared to 31% in winter and 30% in spring and in summer.

Climate autumn 2009

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

Normal Climate in Summer 2008-09

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Weather log summer 2008-09

For most of the summer, 7-day average temperatures got steadily warmer. From 4° below normal in mid-December they rose to 4° above normal in early February. They then crashed to 5° below normal before recovering. Two days exceeded 40°: February 6th (40.1°) and February 9th (40.9°). In ten summers, 19 days have exceeded 40°, the hottest being 42.0° on 21/2/04.
This season had the coldest summer day so far this century: February 14th 2009, with 17.8°. That is 15.3° below normal (it would be normal in winter, not summer)!

NOTE. This is the daily maximum reading that is furthest below normal in the ten-year record from March 1999. There have been only 23 days when the maximum was more than 10° below normal. Only 18 days were more than 8° above normal. The furthest above normal (by 10.5°) was the reading of 38.8° on November 10th 2002.

Humidity was low both in the early cool spell and in the later hot spell. At both times the daily range of temperature was high (17°) and the skies mainly clear.
There were 23 rain days, which is normal and far fewer than the 33 rain days last summer. Dry spells (with falls less than 1 mm) were long: 21 days from the 30th of December, and 16 days from the 25th of January. February the 15th was the wettest day, with 51.2 mm, and the summer total was 228 mm.
The number of overcast mornings (12) was normal for summer, but the number of cloud-free mornings (17) was very low, as it was last summer (13).

All mean temperatures (daily maximum, mean, and minimum) were normal this summer. They were much higher than last summer, with the daily maximum a remarkable 2.8° higher. The mean morning Dew Point was also normal.

The total rainfall of 228 mm is very close to the long-term summer average of 227 mm. It is on the 54th percentile.
At 38% cloudy mornings, this summer was cloudy, but not extremely cloudy like last summer (53%).
The summers of 05-06 and 07-08 were both very wet (319 mm and 311 mm). They differed in other ways: summer 05-06 was hot, humid and not cloudy; summer 07-08 was cold, not humid, and extremely cloudy.

Climate for summer 2008-09

 

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