Harmonic Analysis of the Spatiotemporal Pattern of Thunderstorms in Iran (1961–2010)

Table 2

Spatial features of the frequency of Iran’s thunderstorms for different periods.

Index	1961–1970	1971–1980	1981–1990	1991–2000	2001–2010	1961–2010
Average	7.7	6.8	10.5	13.6	15.3	10.9
Median	6.7	6.1	9.1	12.5	13.2	9.7
Mode	0.6	0.5	0.9	1.5	4.2	2.8
Variance	24.5	15.1	37.9	37.8	65	29
Standard	4.9	3.8	6.1	6.1	8	5.3
Coefficient	63.7	56.7	58.1	44.9	52.4	49.2
Range	31.1	20.1	30.3	32.5	34.9	28.3
Skewness	2.3	0.77	1	1	1	1.2
Kurtosis	9.9	2.8	3.3	3.7	3.3	4.3
Maximum	31.7	20.7	31.2	34.1	39.2	31.2
Minimum	0.6	0.5	0.9	1.5	4.2	2.8
Q1	4.5	3.6	5.8	9.5	9	7.1
Q2	6.7	6.1	9.1	12.5	13.2	9.7
Q3	8.9	9.5	13.2	16.2	19.9	12.6