10 cities and communities

Gutter cleaning, repair and new gutters in Cobb County

Around Cobb County, the NOAA normal is 56 inches a year, with 16 inch-plus days. Summer (June to August) is the wettest stretch (16.0 in). A modest 1,000-square-foot roof here sends 34,800 gallons a year down its downspouts.

Call (888) 217-8865 free call to a gutter contractor in Cobb County

Cobb County: rain and roofs

NOAA station USC00095404, 6 mi

56.2″

Cobb County: yearly rain

MABLETON 1 N station

15.8

Inch-plus rain days

per year

34,800

Roof runoff, Cobb County

gallons per 1,000 sq ft a year

7.97″/hr

Design burst

5 min, 10-year (Atlas 14)

Nov 7

Frost arrives

median first fall frost

1989

Typical house built

median, Census ACS

28%

Pre-1980 houses

Census ACS

Winter14.7 in

Spring13.2 in

Summer16.0 in

Fall12.3 in

Bars to one scale; the longest is summer (June to August).

Cities and communities in Cobb County

Place	Rain, in	Days ≥ 1 in	First frost	Median year built
Roswell	56.3	17.9	11/09	1989
Marietta	56.2	15.8	11/07	1986
Smyrna	54.1	15.4	11/07	1989
Mableton	56.2	15.8	11/07	1985
Kennesaw	54.3	16.1	11/04	1997
Acworth	54.3	16.1	11/04	1998
Powder Springs	56.2	15.8	11/07	1995
Vinings	54.1	15.4	11/08	1994
Fair Oaks	56.2	15.8	11/07	1970
Austell	56.2	15.8	11/07	1988

NOAA 1991–2020 normals by nearest station; ACS 2020–2024. Places of 5,000 people or more.

Stormwater in Cobb County

Streets, drains and runoff in the unincorporated parts of Cobb County are the county’s; in Roswell, Marietta, Smyrna, Mableton, Kennesaw, Acworth, Powder Springs, Austell, the city’s. Ask the county or the city before running a downspout into a street, a ditch or a neighbor’s yard.

Unincorporated communities listed here: Vinings, Fair Oaks.

When to clean gutters here

Median frost dates for Cobb County: first in fall about November 7, last in spring about March 27 (NOAA). Fall cleanout after the frost, spring cleanout after the pollen: two visits cover most Atlanta yards with trees.

Gutter size for the county’s downpours

Atlanta thunderstorms are the real test. For Cobb County, NOAA Atlas 14 puts the ten-year, five-minute burst at 7.97 inches an hour. Using the Copper Development Association rule, that means roughly 900 sq ft of roof per 2×3 downspout, or 1,810 sq ft per 3×4.

The houses

About 293,410 households live in Cobb County; half the homes were built by 1989, and 28% before 1980 (ACS 2020–2024).