Average World Thunderstorm Days/Year
Lightning Frequency Maps are unreliable because lightning varies considerably from year to year. However, these maps provide a general indication of lightning activity. The following lightning maps are displayed in two different references ~ Thunderstorm Days per Year (TD/YR) and Flash Density per Square Kilometer (FD/KM). TD/YR are based upon human observation of "how many days was thunder heard?" FD/KM is based upon a networked ground-based sensor system, as provided by Global Atmospherics lnc. (see more at http://www.glatmos.com/).
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