Atlantic Hurricanes Preseason 2025

Ten Graphs Tell the Story - Roger Pielke Jr. May 30, 2025
There has been no tropical cyclone of hurricane strength anywhere in the Northern Hemisphere so far in 2025. 

If we get to June 5th — which looks quite possible if not probable — then 2025 will have the latest date on record (since 1970) for the first NH hurricane, breaking the record of Ava, which reached hurricane strength in the Eastern Pacific on June 4th, 1973 (thanks to Ryan Maue for confirming — Give his excellent weather Substack a follow).

• What does breaking a long-standing record of annual-to-date hurricane inactivity that has stood for 52 years tell us about the detection and attribution of changes in hurricane climatology?

Well . . . nothing.

• Motivated by a recent commentary in Nature on Atlantic hurricanes that was all opinion and no data, in advance of the official 2025 North Atlantic hurricane season I thought I’d do a post on hurricanes that was all data and no opinion. 

The 2025 hurricane season begins on Sunday, June 1.
Enjoy!

Twleve-month running average counts of global hurricanes (top) and major hurricanes (bottom), 1980 to March 10, 2025. Source: Ryan Maue.