Freezing Dates
Using the NWS COOP data archive, significant dates relating to fall are
extracted and presented on this page. The specific dates are the first
occurance of that temperature and may have occured again in subsequent
years.
The "Record Lows" columns show the first fall occurance of a low
temperature. The "Average Lows" column shows when certain climatological
thresholds are surpassed in the fall.
COOP Site: | Record Lows: | Average Lows: | |||||
---|---|---|---|---|---|---|---|
Temp <= 32°F | Temp <= 28°F | Below 40°F | Below 32°F | Below 28°F | Temp: | Date: | Temp: | Date: |
ROCK-RAPIDS | 31 | {1974}-09-03 | 26 | {1894}-09-10 | 10-07 | 10-24 | 11-05 |
IOWA-FALLS | 31 | {1915}-08-30 | 28 | {1894}-09-18 | 10-12 | 11-01 | 11-10 |
AUDUBON | 30 | {1902,1955}-09-12 | 27 | {1896}-09-19 | 10-17 | 11-01 | 11-10 |
TOLEDO | 31 | {1917}-09-11 | 27 | {1896}-09-20 | 10-17 | 11-02 | 11-11 |
MARSHALLTOWN | 31 | {1955}-09-12 | 28 | {1896}-09-20 | 10-13 | 11-02 | 11-11 |
WINTERSET | 31 | {1955}-09-12 | 26 | {1896}-09-20 | 10-19 | 11-07 | 11-21 |
DUBUQUE-LOCK-AND-DAM | 31 | {1956}-09-20 | 24 | {1899}-09-30 | 10-25 | 11-10 | 11-22 |
PRIMGHAR | 30 | {1902}-09-12 | 25 | {1901}-09-18 | 10-16 | 10-31 | 11-10 |
ATLANTIC-1-NE | 30 | {1893}-09-02 | 28 | {1902,1955}-09-12 | 10-16 | 11-01 | 11-10 |
FAYETTE | 32 | {1949}-09-01 | 27 | {1902}-09-12 | 10-10 | 10-28 | 11-10 |
Le Mars | 31 | {1955}-09-11 | 28 | {1902}-09-12 | 10-12 | 10-29 | 11-08 |
FORT-DODGE | 32 | {1974}-09-03 | 27 | {1902}-09-13 | 10-16 | 11-02 | 11-11 |
LOGAN | 30 | {1902}-09-12 | 28 | {1902}-09-13 | 10-17 | 11-02 | 11-11 |
SIGOURNEY | 32 | {1902}-09-13 | 25 | {1913}-09-21 | 10-19 | 11-08 | 11-22 |
Iowa Drought Region 2 - Northcentral | 32 | {1902}-09-12 | 27 | {1913}-09-22 | 10-17 | 11-02 | 11-11 |
CENTERVILLE | 31 | {1913}-09-13 | 28 | {1913}-09-22 | 10-25 | 11-10 | 11-22 |
GREENFIELD | 32 | {1981}-09-17 | 27 | {1913}-09-22 | 10-19 | 11-08 | 11-21 |
Iowa - Central Climate Division | 31 | {1929}-09-18 | 28 | {1913}-09-22 | 10-19 | 11-03 | 11-11 |
Allerton | 31 | {1991}-09-19 | 27 | {1913}-09-22 | 10-19 | 11-08 | 11-21 |
BELLE-PLAINE | 31 | {1917}-09-11 | 28 | {1916,1929}-09-18 | 10-17 | 11-03 | 11-12 |
KEOSAUQUA | 31 | {1917}-09-11 | 28 | {1916}-09-18 | 10-24 | 11-10 | 11-22 |
Iowa City | 32 | {1923}-09-14 | 28 | {1916}-09-18 | 10-19 | 11-06 | 11-21 |
CHARITON | 32 | {1955}-09-12 | 28 | {1918,1991}-09-20 | 10-17 | 11-05 | 11-21 |
SAC-CITY | 32 | {1974}-09-03 | 28 | {1918}-09-20 | 10-16 | 11-01 | 11-11 |
Ida Grove Area | 32 | {1974}-09-03 | 27 | {1918}-09-20 | 10-16 | 10-28 | 11-10 |
Iowa - Northwest Climate Division | 30 | {1902}-09-12 | 26 | {1918}-09-20 | 10-13 | 10-31 | 11-10 |
Iowa Drought Region 1 - Northwest | 30 | {1902}-09-12 | 25 | {1918}-09-20 | 10-17 | 11-01 | 11-10 |
Iowa - West Central Climate Division | 31 | {1902}-09-12 | 28 | {1918}-09-20 | 10-17 | 11-02 | 11-11 |
SHENANDOAH-1-NE | 32 | {1937}-09-16 | 28 | {1918}-09-20 | 10-19 | 11-07 | 11-21 |
Postville | 32 | {1919}-09-02 | 20 | {1918}-09-21 | 10-17 | 11-02 | 11-11 |
FAIRFIELD | 32 | {1917}-09-11 | 28 | {1918}-09-21 | 10-24 | 11-08 | 11-22 |
DENISON | 29 | {1902}-09-12 | 21 | {1918}-09-21 | 10-18 | 11-02 | 11-11 |
Ames Area | 31 | {1902}-09-13 | 26 | {1918}-09-21 | 10-17 | 11-02 | 11-11 |
AMES-8-WSW | 31 | {1902}-09-13 | 26 | {1918}-09-21 | 10-18 | 11-02 | 11-12 |
CLARINDA | 31 | {1902}-09-13 | 28 | {1918}-09-21 | 10-18 | 11-02 | 11-19 |
MASON-CITY | 30 | {1915}-08-30 | 28 | {1923}-09-14 | 10-10 | 10-28 | 11-09 |
ALLISON | 32 | {1915}-08-30 | 28 | {1926}-09-25 | 10-17 | 11-02 | 11-11 |
Iowa Drought Region 3 - Northeast | 32 | {1902}-09-13 | 27 | {1926}-09-26 | 10-19 | 11-03 | 11-12 |
AMES 5 SE | 32 | {1902}-09-13 | 28 | {1926}-09-26 | 10-19 | 11-04 | 11-20 |
Iowa - Northeast Climate Division | 32 | {1902}-09-13 | 26 | {1926}-09-26 | 10-17 | 11-02 | 11-11 |
CEDAR-RAPIDS-1 | 32 | {2007}-09-15 | 24 | {1926}-09-26 | 10-20 | 11-06 | 11-21 |
Iowa - East Central Climate Division | 32 | {1929}-09-18 | 28 | {1926}-09-26 | 10-20 | 11-06 | 11-21 |
CLINTON-1 | 31 | {1902}-09-13 | 28 | {1928}-09-25 | 10-20 | 11-09 | 11-22 |
JEFFERSON | 32 | {1893}-08-29 | 28 | {1929}-09-18 | 10-17 | 11-02 | 11-11 |
FOREST-CITY | 31 | {1949}-09-01 | 27 | {1929}-09-18 | 10-13 | 10-28 | 11-10 |
POCAHONTAS | 31 | {1946}-09-02 | 27 | {1929}-09-18 | 10-10 | 10-28 | 11-10 |
ALGONA | 29 | {1893}-09-02 | 27 | {1929}-09-18 | 10-17 | 11-01 | 11-10 |
Milford | 32 | {1974}-09-03 | 28 | {1929}-09-18 | 10-10 | 10-31 | 11-08 |
SANBORN | 32 | {1974}-09-03 | 25 | {1929}-09-18 | 10-10 | 10-27 | 11-07 |
Estherville 4E | 32 | {1924}-09-09 | 27 | {1929}-09-18 | 10-07 | 10-27 | 11-06 |
Waterloo Area | 32 | {1917}-09-11 | 28 | {1929}-09-18 | 10-13 | 11-02 | 11-11 |
WEBSTER-CITY | 30 | {1955}-09-11 | 25 | {1929}-09-18 | 10-12 | 10-28 | 11-10 |
WATERLOO | 32 | {1917}-09-11 | 28 | {1929}-09-18 | 10-13 | 11-02 | 11-10 |
SPIRIT LAKE | 31 | {1902}-09-12 | 28 | {1929}-09-18 | 10-17 | 11-01 | 11-10 |
PERRY | 32 | {1955}-09-12 | 27 | {1929}-09-18 | 10-17 | 11-02 | 11-11 |
STORM-LAKE-2-E | 32 | {1902}-09-12 | 28 | {1929}-09-18 | 10-17 | 11-01 | 11-10 |
GRUNDY-CENTER | 32 | {1902}-09-12 | 28 | {1929}-09-18 | 10-13 | 11-02 | 11-11 |
Boone | 32 | {1975}-09-12 | 27 | {1929}-09-18 | 10-17 | 11-02 | 11-11 |
Iowa - North Central Climate Division | 32 | {1902,2014}-09-13 | 28 | {1929}-09-18 | 10-17 | 11-02 | 11-10 |
NORTHWOOD | 32 | {1953}-09-13 | 28 | {1929}-09-18 | 10-10 | 10-28 | 11-08 |
OSAGE | 30 | {1949}-09-14 | 28 | {1929}-09-18 | 10-13 | 11-01 | 11-10 |
MOUNT-PLEASANT | 32 | {1902}-09-13 | 28 | {1942}-09-24 | 10-25 | 11-10 | 11-22 |
WAUKON | 32 | {1937,2011}-09-16 | 25 | {1942}-09-25 | 10-13 | 11-02 | 11-10 |
Iowa Drought Region 4 - Southwest | 32 | {1902}-09-12 | 26 | {1942}-09-28 | 10-19 | 11-05 | 11-19 |
Iowa Average | 32 | {1902}-09-13 | 24 | {1942}-09-28 | 10-19 | 11-03 | 11-11 |
Iowa - Southwest Climate Division | 32 | {1902}-09-13 | 26 | {1942}-09-28 | 10-24 | 11-08 | 11-21 |
Ottumwa | 32 | {2007}-09-15 | 23 | {1942}-09-28 | 10-24 | 11-09 | 11-22 |
Burlington Airport | 30 | {1918}-09-18 | 25 | {1942}-09-28 | 10-27 | 11-10 | 11-24 |
GUTTENBERG-L-AND-D-10 | 32 | {1973}-09-18 | 25 | {1942}-09-28 | 10-24 | 11-07 | 11-21 |
NEWTON | 32 | {1929}-09-18 | 23 | {1942}-09-28 | 10-20 | 11-06 | 11-21 |
Lamoni | 32 | {1901}-09-18 | 27 | {1942}-09-28 | 10-24 | 11-08 | 11-21 |
Iowa - Southeast Climate Division | 32 | {1896}-09-20 | 25 | {1942}-09-28 | 10-25 | 11-09 | 11-22 |
MUSCATINE | 29 | {1991}-09-20 | 23 | {1942}-09-28 | 10-25 | 11-10 | 11-21 |
Donnellson | 31 | {1991}-09-20 | 25 | {1942}-09-28 | 10-19 | 11-10 | 11-22 |
Iowa Drought Region 5 - Southeast | 32 | {1918}-09-21 | 24 | {1942}-09-28 | 10-25 | 11-08 | 11-21 |
Iowa - South Central Climate Division | 32 | {1918}-09-21 | 25 | {1942}-09-28 | 10-25 | 11-08 | 11-21 |
Des Moines Area | 31 | {1995}-09-22 | 26 | {1942}-09-28 | 10-24 | 11-08 | 11-21 |
Fort Madison | 32 | {1913}-09-22 | 26 | {1942}-09-28 | 10-27 | 11-11 | 11-24 |
Des Moines Airport | 31 | {1995}-09-22 | 26 | {1942}-09-28 | 10-24 | 11-08 | 11-21 |
Le Claire L&D 14 | 32 | {1942}-09-26 | 28 | {1942}-09-28 | 10-28 | 11-11 | 11-23 |
DECORAH-2-N | 32 | {1915}-08-30 | 28 | {1946}-09-02 | 10-10 | 11-01 | 11-11 |
NEW-HAMPTON | 28 | {1949}-09-01 | 28 | {1949}-09-01 | 10-13 | 11-01 | 11-10 |
CASCADE | 32 | {2023}-08-31 | 28 | {1953,1974}-09-22 | 10-10 | 11-03 | 11-11 |
SIBLEY-5-NNE | 30 | {1950}-08-20 | 23 | {1955}-09-11 | 10-07 | 10-26 | 11-03 |
CHEROKEE | 31 | {1974}-09-03 | 27 | {1955}-09-11 | 10-07 | 10-27 | 11-07 |
Oelwein Area | 28 | {1955}-09-11 | 28 | {1955}-09-11 | 10-10 | 11-02 | 11-11 |
HAMPTON-2-NW | 32 | {1955}-09-11 | 28 | {1955}-09-12 | 10-12 | 11-01 | 11-10 |
Dubuque Airport | 32 | {2007}-09-15 | 28 | {1956}-09-20 | 10-16 | 11-03 | 11-13 |
Dubuque Area | 32 | {2007}-09-15 | 28 | {1956}-09-20 | 10-19 | 11-05 | 11-21 |
BELLEVUE-L-AND-D-12 | 32 | {1986}-08-30 | 28 | {1974,1995}-09-23 | 10-17 | 11-06 | 11-21 |
CARROLL-2-SSW | 28 | {1974}-09-03 | 28 | {1974}-09-03 | 10-16 | 10-28 | 11-10 |
SWEA CITY 4 W | 32 | {1974}-09-03 | 26 | {1974}-09-22 | 10-09 | 10-29 | 11-10 |
OSCEOLA-3-WSW | 31 | {2007}-09-15 | 28 | {1974}-09-22 | 10-19 | 11-07 | 11-21 |
BURLINGTON | 32 | {1984}-09-26 | 28 | {1974}-10-02 | 10-28 | 11-11 | 11-27 |
VINTON | 32 | {1902,1953}-09-13 | 28 | {1982}-09-21 | 10-17 | 11-03 | 11-12 |
CORNING | 32 | {1902}-09-12 | 27 | {1983}-09-21 | 10-17 | 11-03 | 11-13 |
MAQUOKETA-2-W | 31 | {1917}-09-11 | 28 | {1983}-09-23 | 10-17 | 11-02 | 11-12 |
WASHINGTON | 30 | {1902}-09-13 | 28 | {1983}-09-23 | 10-24 | 11-08 | 11-21 |
MANCHESTER-2 | 32 | {2014}-09-13 | 27 | {1984}-09-16 | 10-13 | 11-02 | 11-11 |
SIOUX-RAPIDS | 31 | {1974}-09-03 | 28 | {1991}-09-19 | 10-09 | 10-27 | 11-07 |
SIOUX CENTER 2 SE | 31 | {1974}-09-03 | 24 | {1991}-09-19 | 10-16 | 10-28 | 11-10 |
MAPLETON NO. 2 | 31 | {1955}-09-11 | 27 | {1991}-09-19 | 10-15 | 11-02 | 11-10 |
GUTHRIE-CENTER | 31 | {1902}-09-12 | 28 | {1991}-09-19 | 10-17 | 11-02 | 11-11 |
MOUNT-AYR | 32 | {1902}-09-13 | 28 | {1991}-09-19 | 10-19 | 11-05 | 11-19 |
Creston | 31 | {1924}-09-15 | 28 | {1991}-09-19 | 10-18 | 11-03 | 11-13 |
BEACONSFIELD | 27 | {1991}-09-19 | 27 | {1991}-09-19 | 10-19 | 11-05 | 11-20 |
GRINNELL-3-SW | 31 | {1976}-09-10 | 27 | {1991}-09-20 | 10-17 | 11-02 | 11-11 |
WILLIAMSBURG | 32 | {1917}-09-11 | 28 | {1991}-09-20 | 10-18 | 11-03 | 11-12 |
CHARLES-CITY | 32 | {1902,1955}-09-12 | 28 | {1991}-09-20 | 10-16 | 11-02 | 11-11 |
COLUMBUS JUNCT 2 SSW | 31 | {1955}-09-12 | 28 | {1991}-09-20 | 10-24 | 11-08 | 11-22 |
OSKALOOSA | 31 | {1902}-09-13 | 27 | {1991}-09-20 | 10-19 | 11-08 | 11-21 |
OAKLAND-2-E | 32 | {1974}-09-03 | 28 | {1995}-09-22 | 10-17 | 11-03 | 11-11 |
RED-OAK | 32 | {1940}-09-11 | 28 | {1995}-09-22 | 10-19 | 11-03 | 11-21 |
Sioux City Area | 30 | {1902}-09-13 | 25 | {1995}-09-22 | 10-17 | 11-02 | 11-10 |
SIOUX-CITY-WSO-AP | 30 | {1902}-09-13 | 25 | {1995}-09-22 | 10-17 | 11-02 | 11-10 |
IOWA CITY MUNICIPAL AP | 32 | {1991}-09-20 | 26 | {1995}-09-23 | 10-19 | 11-07 | 11-21 |
Elkader 6SSW (Osborn) | 32 | {1893}-08-29 | 0 | {2002}-09-02 | 10-09 | 10-28 | 11-10 |
AMES MUNICIPAL AP | 31 | {2007}-09-15 | 27 | {2003}-09-30 | 10-14 | 10-31 | 11-11 |
MUSCATINE 2N | 27 | {2003}-10-02 | 27 | {2003}-10-02 | 10-17 | 11-11 | 11-22 |
DES MOINES WSFO-JOHNSTON | 31 | {1999}-09-21 | 28 | {2004}-10-02 | 10-21 | 11-10 | 11-12 |
SIOUX CITY ANG | 31 | {2012}-09-23 | 20 | {2004}-10-02 | 10-11 | 10-27 | 11-10 |
Emmetsburg | 0 | {2005}-09-03 | 0 | {2005}-09-03 | 10-13 | 11-01 | 11-10 |
Spencer | 31 | {1974}-09-03 | 28 | {2007}-09-15 | 10-09 | 10-27 | 11-08 |
ESTHERVILLE MUNICIPAL AP | 31 | {2014}-09-13 | 28 | {2007}-09-15 | 10-10 | 10-26 | 11-07 |
Spencer Area | -1 | {2010}-08-16 | -1 | {2010}-08-16 | 10-09 | 10-27 | 11-08 |
Spencer Airport | -1 | {2010}-08-16 | -1 | {2010}-08-16 | 10-09 | 10-26 | 11-10 |
LAMONI | -1 | {2011,2012}-08-07 | -1 | {2011,2012}-08-07 | 10-26 | 11-11 | 11-21 |
MASON CITY MUNICIPAL AP | 31 | {2014}-09-13 | 26 | {2011}-09-15 | 10-09 | 10-28 | 11-07 |
RATHBUN DAM | 0 | {2012}-08-09 | 0 | {2012}-08-09 | 10-17 | 11-07 | 11-21 |
BATTLE CREEK 3NE | 32 | {2014}-09-13 | 24 | {2012}-09-23 | 10-04 | 10-17 | 10-31 |
STANLEY | 31 | {2014}-09-13 | 26 | {2012}-09-23 | 10-11 | 10-27 | 11-01 |
LITTLE SIOUX 2NW | 31 | {2007}-09-15 | 27 | {2012}-09-23 | 10-08 | 10-25 | 11-01 |
MARSHALLTOWN MUNICIPAL AP | 30 | {2007}-09-15 | 27 | {2012}-09-23 | 10-14 | 10-31 | 11-11 |
LOWDEN | 32 | {2014}-09-13 | 26 | {2012}-09-24 | 10-14 | 11-01 | 11-11 |
Cedar Rapids Area | 31 | {2007}-09-15 | 28 | {2012}-09-24 | 10-18 | 11-03 | 11-19 |
Cedar Rapids Airport | 31 | {2007}-09-15 | 28 | {2012}-09-24 | 10-17 | 11-05 | 11-13 |
OELWEIN 1E | 32 | {2011}-09-15 | 28 | {2012}-10-05 | 10-13 | 10-28 | 11-11 |
DAVENPORT WFO | 30 | {2012}-09-23 | 27 | {2012}-10-05 | 10-15 | 10-29 | 11-11 |
ANAMOSA 3 SSW | 30 | {2012}-09-24 | 26 | {2015}-10-17 | 10-15 | 10-29 | 11-12 |
HOLSTEIN 5 NNW | 30 | {2020}-10-02 | 28 | {2019}-10-12 | 10-08 | 10-15 | 10-27 |