Last updated September 18, 2026
Key statistics
56.88 inches
Alabama's average annual rainfall across the 1991-2020 period, calculated from the National Centers for Environmental Information statewide precipitation series. It is a 30-year reference average, not a forecast for any one year.
Source, 1991-2020: NOAA National Centers for Environmental Information statewide precipitation data
Link to this statistic0.62 gallons
The U.S. Department of Energy uses 0.62 as the conversion factor for one inch of rain falling on one square foot of roof or other catchment area.
Source, June 14, 2017: U.S. Department of Energy rainwater-harvesting guidance
Link to this statistic1,240 gallons
Using the Department of Energy conversion factor, one inch of rain over a 2,000-square-foot roof equals about 1,240 gallons before collection losses. Calculation: 2,000 x 1 x 0.62.
Source, Calculation updated September 18, 2026: Calculated from U.S. Department of Energy rainwater-harvesting guidance
Link to this statistic14.44 inches
Rain recorded in Dothan during June 2004, according to the National Weather Service's annual local weather review. The report notes this total occurred without tropical-system assistance.
Source, June 2004: National Weather Service Tallahassee, 2004 local weather review
Link to this statisticOver 3 inches
Rain recorded in Dothan over 24 hours on April 7-8, 2003, within a month that totaled nearly eight inches, according to the National Weather Service.
Source, April 7-8, 2003: National Weather Service Tallahassee, 2003 weather review
Link to this statistic29%
Nearly one-third of National Flood Insurance Program flood-insurance claims come from outside high-risk flood areas, according to FloodSmart.gov.
Source, Accessed September 18, 2026: FloodSmart.gov, National Flood Insurance Program
Link to this statisticWhat these numbers mean for a home
Rainfall totals are not a diagnosis for any one property. Roof shape, gutter capacity, downspout placement, slope, soil, landscaping, and the final discharge point all change how water behaves once it leaves the roof.
The practical takeaway is scale. A short burst of rain can send a substantial volume through one roofline. When gutters are clogged, undersized, loose, or empty beside a foundation or low spot, the water still has to go somewhere.
How to use this reference
Homeowners can use these figures to put a rain event into context before looking at their own water path. Writers, property professionals, and community groups may cite the individual statistics below, using the permanent links and original sources.
For a property-specific recommendation, start by noting where roof water collects, where it leaves each downspout, and where it settles after rain. Crown & Cross can help Wiregrass homeowners evaluate seamless gutters, gutter maintenance, and underground drainage as one connected plan.
Frequently asked questions
Does a high rainfall total mean every home needs drainage work?
No. A rainfall total alone does not determine the right solution. The useful question is how roof water moves through the gutter system and across the specific property.
Why is roof area included in a rainfall calculation?
A roof acts as a catchment area. The larger the roof area, the more water a one-inch rain event can collect and send toward the gutter and downspout system.
Can I cite a statistic from this page?
Yes. Each statistic has a permanent link and its original source. Cite the original source for the underlying figure and include this page when referring to the local homeowner context or the listed calculation.
Methodology and sources
This page uses published figures from federal agencies and the National Weather Service. Historic weather observations show what has occurred, while the statewide precipitation figure is calculated from the linked 30-year NOAA data series. Roof-runoff figures use the published 0.62-gallon conversion factor and identify the calculation used. Sources are linked with each statistic so readers can check the original material.
Suggested citation: Crown & Cross Exteriors LLC, Alabama Rainfall and Flood Statistics for Homeowners, last updated September 18, 2026, https://crownandcrossexteriorsllc.com/resources/alabama-rainfall-flood-statistics.
General homeowner information, not legal, insurance, HOA, engineering, or coverage advice.
Request a Free Estimate