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The main thunderstorm season (= at least one thunderstorm day per month) ends about Mid/Late October and starts again about Mid May.
But actually thunderstorms are possible at any time of year, the lowest occurence seem to be in February and April, March usually gets a little more than this on average.
Thunderstorms are not particularly common in Perth but can occur at anytime of the year with a slight winter peak. Each month averages between 1-2 thunder days.
2013: 19 December
2012: 17 October
2011: 16 September
2010: 14 November
2009: 23 December
2008: 28 October
2007: 19 November
2006: 7 December
2005: 19 October
2004: 24 October
Thunderstorms are possible until the Baltic freezes over, so until mid January on average. We had thundersnow a couple of years back, but nevertheless these are rare occurrances. Usually the last thunderstorm is in September, after that the sea cools down rapidly and the small systems usually disintegrate as soon as they hit the continent. One exception was in January 2005 when Atlantic storms with thunderstorms hit Helsinki and caused heavy flooding.
February-April has around a 99.9% chance of getting no thundery action whatsoever.
Depends on if we get a storm at all, or if we get more than one. In 2013, our last was 22 August, but that was one of only two storms. In 2012, we had one in August. In 2011, we had one in September, and I saw some lightning in October.
Thunderstorms are possible until the Baltic freezes over, so until mid January on average. We had thundersnow a couple of years back, but nevertheless these are rare occurrances. .
I have noticed some thunderstorms in late autumns if I have happened to be outside but usually only lightning and no sound. Those lightnings are easy to notice because of long and dark evenings in autumn. I believe those who have been in houses have hardly notice anything and thus those later than September thunderstorms are hardly comparable with earlier ones. Mostly for meteostations to notice.
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