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At a Glance There are only two days during the Atlantic hurricane season when no tropical storms have formed.

Hurricane season runs from June 1 through Nov. 30. In more than 160 years of records, just two dates during the Atlantic hurricane season have not seen the formation of a tropical storm.

June 10 and Nov. 16 are the dates during the Atlantic hurricane season that no tropical storms have formed in the basin since records began in 1851, according to Michael Lowry, hurricane specialist at The Weather Channel . The official dates of the hurricane season span from June 1 through Nov. 30, or 183 days total. It should be noted, however, that storms do occasionally form both before and after those "official" dates.

Nothing would prevent a tropical storm from forming on those dates; it's just a statistical anomaly from the rest of the days during the season. Also, keep in mind that before the satellite era, which started in the mid-1960s, there could have been storms in the open Atlantic Ocean that may have formed on those dates, but were not detected.

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When Are Tropical Storms and Hurricanes Most Frequent?

<img class="styles__noscript__2rw2y" src="https://dsx.weather.com//util/image/w/frequency-boxed.jpg?v=at&w=485&h=273&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0" srcset="https://dsx.weather.com//util/image/w/frequency-boxed.jpg?v=at&w=485&h=273&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0 400w, https://dsx.weather.com//util/image/w/frequency-boxed.jpg?v=ap&w=980&h=551&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0 800w" > Atlantic named storm and hurricane frequency. Notice that activity is much less in June and November compared to the peak months of August-October.

The two dates that a tropical storm has not formed in the Atlantic since 1851 are in line with where you would expect them to fall on the calendar.

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June and November are typically two of the least active months during the hurricane season, which peaks from August through October. On average, about one named storm forms in the Atlantic Basin every other year in June and November, according to NOAA's Hurricane Research Division .

The graph above illustrates the peak in activity between August and October, as compared to June, July and November.

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