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

Table 5

The area covered by Iran’s thunderstorms during different periods.

Cycle (year)	1961–1970 (percent)	1971–1980 (percent)	1981–1990 (percent)	1991–2000 (percent)	2001–2010 (percent)	Annual
						Cycle (year)	1961–2010 (percent)
1–2	9	7.6	8.7	1.7	12.6	0–10	3.2
2–4	74.6	33.6	49.2	52.7	69.5	10–20	14.9
4–8	15	50.7	37.2	43.5	15.2	20–30	14.1
8–10	1.4	8.1	4.8	2.1	2.7	30–40	18.5
						40–50	49.3