3-year trends to August 2020

August narrow temperature range

3-year climate anomaly trends to August 2020

August raw anomaly data (orange)


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.


January data points are marked by squares.


Smoothing uses Gaussian functions.
For fully smoothed data the function has a Standard Deviation of 2.5 months, it spans 13 monthly data points, and has a half-width of 6 months, which suppresses cycles shorter than 12 months. For partly smoothed data, the span of the function is reduced to 11 months, 9 months and so on.

Fully smoothed data points are plotted in red, partly smoothed data uncoloured, and raw data for the last data point in orange.

Limiting values

Blue diamonds and the dashed blue rectangle show the extreme values in the fully smoothed data record since September 1999.

Normal values

Normal values are based on averages for the decade from March 1999.* They appear on these graphs as a turquoise (turquoise) circle at the origin (0,0). A range of anomalies called “normal” is shown by a dashed rectangle in aqua (aqua). For values in degrees, the assigned normal range is +/-0.7°; for cloudiness, +/-7%; for monthly rainfall, +/-14 mm.

 * Normal values for rainfall are based on averages for the 125 years beginning 1883.

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