Number of cities

Pearson

Spearman

r

p-value

r

p-value

Temperature (˚C)

50

−0.44

<0.0001

−0.50

<0.0001

Heat index

50

−0.44

<0.0001

−0.50

<0.0001

Precipitation (0.1 mm)

50

−0.39

<0.0001

−0.47

<0.0001

Sunshine hours (hrs)

50

−0.16

0.000

−0.11

0.009

Pressure (kPa)

50

0.13

0.001

0.18

<0.0001