Aviation Weather

full text of the classic FAA guide

WHERE AND WHEN?

In some tropical regions, thunderstorms occur year-round. In midlatitudes, they develop most frequently in spring, summer, and fall. Arctic regions occasionally experience thunderstorms during summer.

Figure 100 shows the average number of thunderstorms each year in the adjoining 48 States. Note the frequent occurrences in the south-central and southeastern States. The number of days on which thunderstorms occur varies widely from season to season as shown in figures 101 through 104. In general, thunderstorms are most frequent during July and August and least frequent in December and January.

FIGURE 100. The average number of thunderstorms each year.

FIGURE 101. The average number of days with thunderstorms during spring.

FIGURE 102. The average number of days with thunderstorms during summer.

FIGURE 103. The average number of days with thunderstorms during fall.

FIGURE 104. The average number of days with thunderstorms during winter.

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