The average temperature of Kabul is given as 15^\circ C. The population of average city temperature lower than that of Kabul is

15 - 19.7 = -4.7 relative to the mean.

This is -\frac{4.7}{2} = -2.35 standard deviations relative to the mean.

This is Kabul's average temperature z-score.

We want to find the proportion of average city temperature below -2.35.

So, 0.0094 proportion of average city temperatures are lower than that of Kabul.

I found an answer from demonstrations.wolfram.com

Wolfram Demonstrations Project

Construct a Triangle ABC Given the Length of AB, the Angle at C and the Sum of the Other ... 7. Construct a Triangle Given the Lengths of Two Sides and a Median of the Third Side ... Applying the Iota-Delta Numerical Function to Describe Normal and ... Approximate Bubble Temperature Distribution for Benzene, Toluene, ...

For more information, see Wolfram Demonstrations Project

I found an answer from large.stanford.edu

Planting Healthy Air

The 21st century will be the urban century, as more than 2 billion additional ... the median cost-effectiveness of street tree planting across sites, while its error bars ... Average annual maximum temperature (˚C) for the period from 1960 to 1990. This period is often used as a reference period for “normal” temperatures before.

For more information, see Planting Healthy Air