Tag Archives: humid

August 2020: warm nights and cool days

Posted in Manilla NSW, Monthly weather by

Weather log for August 2020

Weather log August 2020 Manilla

In August 2020, both the second and third weeks had warm nights that raised the weekly temperatures. The night of the 15th was especially warm, above normal by 8.5°. With the warm nights most days were cloudy, and five days had more than 0.2 mm of rain. The highest reading, 17.6 mm, was on the 8th.
There were 11 frosts (normally 15).

Comparing August months

Climate August 2020 Manilla NSW

The last three August months have all had very low moisture values, with August 2019 being also very warm. This month was much more humid: a higher dew point (2.0°), cloudy skies (42%) and an extremely narrow daily temperature range (12.3°) that was 4° narrower than normal.
Rainfall, however, was only at the 38th percentile (27.8 mm). That is still far below the August average (40 mm) and has added little to depleted water storages.

Drought

I will report separately on the on-going drought. Extreme rainfall shortages persist.

Data. A Bureau of Meteorology automatic rain gauge operates in the museum yard. From 17 March 2017, 9 am daily readings are published as Manilla Museum, Station 55312.  These reports use that rainfall data when it is available. Recording resumed on 20 July 2019. The gauge failed again during February (25/02/2020 ), but was repaired on 11/3/20.
My estimates of early morning dew point have drifted anomalously low. From August 2019, I use data from the Tamworth Airport published graphs.
All other data, including subsoil at 750 mm, are from 3 Monash Street, Manilla.

3-year trends to August 2020

Posted in 3-year climate trends, Manilla NSW by

August narrow temperature range

3-year climate anomaly trends to August 2020

August raw anomaly data (orange)

Temperatures

Daily maximum temperature anomaly (all x-axes), was just below normal.
Daily minimum temperature anomaly (lower left): was just above normal.
Subsoil temperature anomaly (lower right): was above normal.

Moistures (moist is at the bottom)

Rainfall anomaly (upper left) was normal.
Cloudiness anomaly (upper right) was more cloudy than normal.
Dew point anomaly (middle left) was normal.
Daily temperature range anomaly (middle right) was extremely narrow (humid).

 Fully smoothed data values (red) 

Fully-smoothed data for the summer (DJF) of 2019-20 shows that the daily maximum temperature anomaly continued to fall from the record value of October 2019. The daily minimum and subsoil values were static.
All the moisture indicators (rainfall, cloud, dew point, and daily temperature range) continued to move downward, showing decreasing drought.
The partially-smoothed anomaly values through the autumn and winter were near normal. They were not nearly moist enough nor cool enough to relieve the on-going drought that had peaked with high temperature and low moisture anomalies in 1918-19.

Notes:

January data points are marked by squares.

Smoothing Continue reading →

3-year trends to July 2020

Posted in 3-year climate trends, Manilla NSW by

July: warm and humid

3-year climate trends to July 2020 at Manilla

July raw anomaly data (orange)

Temperatures

Daily maximum temperature anomaly (all x-axes), remained near +1 deg.
Daily minimum temperature anomaly (lower left): rose very high (+2.5 deg).
Subsoil temperature anomaly (lower right): remained very high.

Moistures (moist is at the bottom)

Rainfall anomaly (upper left) just below normal.
Cloudiness anomaly (upper right): near normal.
Dew point anomaly (middle left): just above normal.
Daily temperature range anomaly (middle right) low (humid).

 Fully smoothed data values (red) 

Fully-smoothed data for January 2020 shows that the daily maximum temperature anomaly continued to fall from the record value of October 2019. The daily minimum and subsoil values were static.
All the moisture indicators (rainfall, cloud, dew point, and daily temperature range) continued to move downward, showing decreasing drought.

Notes:

January data points are marked by squares.

Smoothing Continue reading →

February 2020: wet, humid, cool

Posted in Manilla NSW, Monthly weather by
Garden path suddenly overgrown.

Overgrown Path

High weekly temperature persisted only a few days into February. After that, the temperature was normal or below normal. Day temperatures varied, without reaching extremes. Although the warmest February night (27.6°) came on the 2nd, most nights were near normal (18.0°).
After the first days, the dew point was high, making for very humid mornings, which were also overcast.
There were fourteen rain days, over twice the usual number.
Two days had over 40 mm of rain, causing local erosion and flooding. For Manilla, these are not very wet days. [See note below: “Very Wet Days”.]

Weather log for Feb 2020.

Comparing February months

The mean monthly temperature, at 25.2°, is near normal, and cooler than the last four February months. More dramatic is the low mean daily maximum temperature (31.1°), which is fourth coolest for February in the new century.
All moisture indicators were extremely high. Compared to 21st century February values, they were:

Cloudy days percent (62%): highest.
Daily temperature range (11.9°): lowest.
Dew point (16.7°): 2nd highest.
Rainfall total (165.4 mm): 2nd highest.

The rainfall total of 165.4 mm is at the 92nd percentile for February, well above the average of 67 mm. The previous eight months all had rainfall below average.

Clime to Feb 2020.

Drought

I will report separately on the on-going drought that has again broken a low-rainfall record for a duration of 96-months.

NOTE.
Very Wet Days

I have a blog post that shows the 125 rain days at Manilla that exceeded 50 mm.
From time to time, there is a period of years without extreme daily rainfalls: when no day has more than 80 mm of rain. We are in the longest such period, beginning 21 years ago, on 7 September 1998. [That day was the 5th wettest, at 112 mm, which filled Split Rock Dam.] See the “Comments” section in the linked post.

Data. A Bureau of Meteorology automatic rain gauge operates in the museum yard. From 17 March 2017, 9 am daily readings are published as Manilla Museum, Station 55312.  These reports use that rainfall data when it is available. Recording resumed on 20 July 2019. Unfortunately, the gauge failed during this month (25/02/2020 ). Pending repair, I am using my own gauge.
My estimates of early morning dew point have drifted anomalously low. From August 2019, I use data from the Tamworth Airport published graphs.
All other data, including subsoil at 750 mm, are from 3 Monash Street, Manilla.

3-year trends to February 2020

Posted in 3-year climate trends, Manilla NSW by

February suddenly cool and wet

3-year climate trends to Feb 2020

February raw anomaly data (orange)

Temperatures

Daily maximum temperature anomaly (all x-axes) suddenly fell by 5° to -2°.
Daily minimum temperature anomaly (lower left): fell from extremely high to normal.
Subsoil temperature anomaly (lower right): still near normal.

Moistures (moist is at the bottom)

Rainfall anomaly (upper left) suddenly rose by 130 mm/month to plus 100 mm/month.
Cloudiness anomaly (upper right): rose from normal to +32%.
Dew point anomaly (middle left): remained rather high (humid).
Daily temperature range anomaly (middle right) reached -3°.

 Fully smoothed data values (red) 

Smoothed anomaly values now include the winter season (JJA) of 2019. From the rather static values of the autumn, nearly all smoothed values for winter moved steadily in the direction towards drought that seems to have prevailed through spring.
There were two exceptions. Daily minimum temperature anomaly steadily fell. Subsoil temperature anomaly fell from a peak value in June.

The August 2019 daily maximum temperature anomaly of +1.83° just exceeded the previous record value.

Notes:

January data points are marked by squares.

Smoothing Continue reading →