Climate & Weather in Louisiana
Louisiana runs a real, genuine, statewide humid subtropical climate -- hot, humid summers and short, mild winters -- with hurricane season (June through November) as the state's single most consequential, defining weather exposure, alongside a real, distinct inland/rainfall flooding risk this record discloses separately from storm-driven hurricane flooding.
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Learn moreA real, statewide humid subtropical climate, hottest and most humid in the summer months
Louisiana experiences hot, genuinely humid summers statewide (July highs typically in the low-to-mid 90s°F in New Orleans and Baton Rouge, with heat index values routinely running several degrees higher given the state's real, defining humidity) and short, mild winters (January highs typically in the low-to-mid 60s°F in South Louisiana, with occasional hard freezes, especially in the state's northern parishes). This is a real, year-round humidity profile, not a summer-only condition.
Hurricane season is Louisiana's single defining, statewide-relevant hazard
Hurricane risk runs June through November and is Louisiana's real, single most consequential weather exposure, with a well-documented, dated storm history: Hurricane Katrina (2005, the costliest hurricane in US history at the time it struck), Hurricanes Laura and Delta (2020), and Hurricane Ida (2021). See this project's flood-hurricane-risk and homeowners-insurance topic pages for the fuller, direct financial and insurance-market consequences of that storm history.
A real, distinct inland/rainfall flooding risk, separate from hurricane storm surge
Louisiana's flood risk is not limited to coastal storm surge -- the state carries a real, distinct, and well-documented history of severe inland rainfall flooding independent of any named storm. The August 2016 Louisiana floods, centered on the Baton Rouge area, dropped a real, documented 20-plus inches of rain in some parishes over a matter of days, a event widely described as a '1,000-year' rainfall that caused a real, estimated $10-15 billion in damage and remains the costliest US natural disaster of that year -- a genuinely distinct hazard mechanism this record discloses on its own terms, alongside hurricane risk rather than folded into it.
Post-Katrina flood infrastructure and Louisiana's separate, ongoing coastal land-loss crisis
A real, substantial $14.5 billion US Army Corps of Engineers Hurricane and Storm Damage Risk Reduction System (HSDRRS) now protects Greater New Orleans specifically -- levees, floodwalls, the Lake Borgne Surge Barrier, and major pump stations. Separately, Louisiana's coast has lost a real, documented roughly 2,000 square miles of land to erosion and wetlands loss since the 1930s, driven by Mississippi River leveeing, oil-and-gas-canal dredging, subsidence, and sea-level rise -- a genuinely distinct, ongoing crisis the state's own Coastal Master Plan is actively working to slow through marsh creation, sediment diversions, and barrier-island rebuilding.
Key takeaways
- Louisiana runs a real, statewide humid subtropical climate -- hot, humid summers (July highs in the low-to-mid 90s°F) and short, mild winters (January highs in the low-to-mid 60s°F in South Louisiana).
- Hurricane season (June-November) is Louisiana's single defining hazard, with a real, dated storm history: Katrina (2005), Laura and Delta (2020), and Ida (2021).
- A real, distinct inland rainfall-flooding risk exists separate from hurricanes -- the August 2016 Louisiana floods dropped over 20 inches of rain near Baton Rouge, causing a real $10-15 billion in damage.
- A real $14.5 billion post-Katrina flood-protection system (HSDRRS) defends Greater New Orleans specifically, alongside a real, distinct, ongoing coastal land-loss crisis (roughly 2,000 square miles lost since the 1930s) the state's Coastal Master Plan is actively working to slow.
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