February 2020: wet, humid, cool

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

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

January 2020 more humid

Rain in the main street

It rained!

Weekly average temperatures were 7 deg high early in the month, normal in the third week, then 6 deg high at the end. In these hot weeks, ten days went over 40 deg.
The night of the 11th, at 28.1 deg, was extremely warm. It was the 2nd warmest on record, after 28.2 on 14/01/17.
Although the wettest day had only 22.8 mm of rain, there were 11 rain days. Other signs of moisture included 11 days with half cloud cover or more, and 9 mornings with dew points over 20 deg.

Weather log January 2020

Comparing January months

Mean temperatures this month are the 2nd highest for January, being lower than last year. Subsoil temperature is normal.
All moisture indicators are higher. The early morning dew point, at 16.8 deg, is remarkably high, exceeded only in January 2006.
The rainfall total of 46.8 mm is at the 28th percentile for January, well below the average of 87 mm.

January climae

Drought

I will report separately on the on-going drought that continues to break low-rainfall records at durations of 15-months and longer.


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.
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 January 2020

January much more humid

3-year climate trends to Jan 2020

January raw anomaly data (orange)

Temperatures

Daily maximum temperature anomaly (all x-axes) high, but not now extreme: now only three degrees above 21st century normal.
Daily minimum temperature anomaly (lower left): extremely high, twice as high as the record smoothed value
Subsoil temperature anomaly (lower right): still near normal.

Moistures (moist is at the bottom)

Rainfall anomaly (upper left): no longer extremely low.
Cloudiness anomaly (upper right): back to normal.
Dew point anomaly (middle left): suddenly rather high (humid).
Daily temperature range anomaly (middle right): suddenly narrow, due to cloud.

 Fully smoothed data values (red) 

Smoothed anomaly values now include July of 2019. From the rather static values of the autumn, nearly all smoothed values for June began to move in the direction towards drought that seems to have persisted through spring.
There were two exceptions. Daily minimum temperature anomaly continued to fall. Subsoil temperature anomaly reached a peak value in June.


Notes:

January data points are marked by squares.

Smoothing Continue reading

January 2017 had the hottest night

Cumulus congestus at 130 km

Showers at 130 kilometres

The daily weather log

In the early morning on the 14th, the minimum temperature was 28.2°, the hottest night in this record from 1999. That beat 27.8° set on November the 28th, 2009. Of January months, only this month and January 2006 had no nights as cool as 15°. There were no cool days either: like January 2002, no days were as cool as 30° (and none since 16/12/16). However, only two days this month went over 40°: the 12th with 41.4° and the 13th with 41.2°. That hardly compares with January 2003, which had five. The weekly average temperature was over 30° (4.7° above normal) from the 11th to the 15th. Late in the month, it got as low as 28°, then climbed again.
Showers and storms brought rain on 8 days, but the maximum was only 19.8 mm.

Weather log January 2017

Comparing January months

As in December, this was the hottest January of the new century. It easily beat January 2013 in mean daily maximum (36.4°), mean average (28.7°), and especially mean daily minimum (hot nights: 21.0°). As this months days and nights were both so warm, the daily temperature range was quite normal (15.4°).
Contradicting the high air temperatures, the subsoil temperature was below normal, at 25.1°.
The month was more humid than usual. Afternoon humidity, at 36%, was the highest January value in twelve years (normally 28%), and early morning dew point was the highest in eleven years.
The monthly rainfall total of 48.5 mm is in the 30th percentile, well below the average of 87 mm. Rainfall totals for more than one month still show no shortages. The 48-month total of 2320 mm (down 280 mm) has the lowest percentile value (23rd percentile) as a legacy of dry months around 2013.

Climate for January

 


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 four months ago (8/10/16), and this month’s readings are from my non-standard gauge. All data, including subsoil at 750 mm, are from 3 Monash Street, Manilla.