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: |
BATTLE CREEK 3NE | 32 | {2014}-09-13 | 24 | {2012}-09-23 | 10-04 | 10-15 | 10-31 |
SIBLEY-5-NNE | 30 | {1950}-08-20 | 23 | -09-11 | 10-07 | 10-26 | 11-03 |
ROCK-RAPIDS | 31 | {1974}-09-03 | 26 | {1894}-09-10 | 10-07 | 10-24 | 11-05 |
Estherville 4E | 32 | {1924}-09-09 | 27 | {1929}-09-18 | 10-07 | 10-27 | 11-06 |
CHEROKEE | 31 | {1974}-09-03 | 27 | -09-11 | 10-07 | 10-27 | 11-07 |
SANBORN | 32 | {1974}-09-03 | 25 | {1929}-09-18 | 10-10 | 10-27 | 11-07 |
SIOUX-RAPIDS | 31 | {1974}-09-03 | 28 | {1991}-09-19 | 10-09 | 10-27 | 11-07 |
ESTHERVILLE MUNICIPAL AP | 31 | {2014}-09-13 | 28 | {2007}-09-15 | 10-10 | 10-24 | 11-07 |
MASON CITY MUNICIPAL AP | 31 | {2014}-09-13 | 26 | {2011}-09-15 | 10-09 | 10-28 | 11-07 |
Milford | 32 | {1974}-09-03 | 28 | {1929}-09-18 | 10-13 | 10-31 | 11-08 |
Spencer | 31 | {1974}-09-03 | 28 | {2007}-09-15 | 10-09 | 10-27 | 11-08 |
Iowa - Northwest Climate Division | 32 | {1974}-09-03 | 26 | {1918}-09-20 | 10-12 | 10-28 | 11-08 |
Iowa Drought Region 1 - Northwest | 32 | {1974}-09-03 | 28 | {1991}-09-19 | 10-12 | 10-28 | 11-08 |
Spencer Area | 31 | {1974}-09-03 | 28 | {2007}-09-15 | 10-09 | 10-27 | 11-08 |
LEMARS | 31 | -09-11 | 28 | {1902}-09-12 | 10-12 | 10-28 | 11-08 |
MAPLETON NO. 2 | 31 | -09-11 | 27 | {1991}-09-19 | 10-15 | 11-02 | 11-08 |
LAKE PARK | 30 | {1940}-09-12 | 28 | {1916}-09-15 | 10-12 | 10-28 | 11-08 |
MASON-CITY | 30 | {1915}-08-30 | 28 | {1923}-09-14 | 10-10 | 10-28 | 11-09 |
FOREST-CITY | 31 | {1949}-09-01 | 27 | {1929}-09-18 | 10-13 | 10-28 | 11-09 |
Elkader 6SSW (Osborn) | 32 | {1893}-08-29 | 0 | {2002}-09-02 | 10-09 | 10-27 | 11-10 |
IOWA-FALLS | 31 | {1915}-08-30 | 28 | {1894}-09-18 | 10-12 | 11-01 | 11-10 |
FAYETTE | 32 | {1949}-09-01 | 27 | {1902}-09-12 | 10-10 | 10-28 | 11-10 |
NEW-HAMPTON | 28 | {1949}-09-01 | 28 | {1949}-09-01 | 10-13 | 11-01 | 11-10 |
ALGONA | 29 | {1893}-09-02 | 27 | {1929}-09-18 | 10-17 | 11-01 | 11-10 |
POCAHONTAS | 31 | {1946}-09-02 | 27 | {1929}-09-18 | 10-10 | 10-28 | 11-10 |
ATLANTIC-1-NE | 30 | {1893}-09-02 | 28 | {1902,1955}-09-12 | 10-17 | 11-01 | 11-10 |
CARROLL-2-SSW | 28 | {1974}-09-03 | 28 | {1974}-09-03 | 10-16 | 11-01 | 11-10 |
SIOUX CENTER 2 SE | 31 | {1974}-09-03 | 24 | {1991}-09-19 | 10-16 | 10-28 | 11-10 |
SWEA CITY 4 W | 32 | {1974}-09-03 | 26 | {1974}-09-22 | 10-09 | 10-29 | 11-10 |
Ida Grove Area | 32 | {1974}-09-03 | 27 | {1918}-09-20 | 10-16 | 10-31 | 11-10 |
HAMPTON-2-NW | 32 | -09-11 | 28 | {1955}-09-12 | 10-13 | 11-01 | 11-10 |
WEBSTER-CITY | 30 | -09-11 | 25 | {1929}-09-18 | 10-12 | 10-28 | 11-10 |
AUDUBON | 30 | {1902,1955}-09-12 | 27 | {1896}-09-19 | 10-17 | 11-01 | 11-10 |
Emmetsburg | 32 | {1902}-09-12 | 28 | {1929}-09-18 | 10-13 | 11-01 | 11-10 |
PRIMGHAR | 30 | {1902}-09-12 | 25 | {1901}-09-18 | 10-16 | 10-31 | 11-10 |
ROCKWELL-CITY | 32 | {1902}-09-12 | 28 | {1929}-09-18 | 10-17 | 11-01 | 11-10 |
SPIRIT LAKE | 31 | {1902}-09-12 | 28 | {1929}-09-18 | 10-17 | 11-01 | 11-10 |
STORM-LAKE-2-E | 32 | {1902}-09-12 | 28 | {1929}-09-18 | 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 - North Central Climate Division | 32 | {1902}-09-13 | 28 | {1929}-09-18 | 10-12 | 11-01 | 11-10 |
Spencer Airport | 32 | {2014}-09-13 | 28 | {2007}-09-15 | 10-04 | 10-24 | 11-10 |
Sioux City Area | 30 | {1902}-09-13 | 25 | {1995}-09-22 | 10-17 | 11-02 | 11-10 |
OSAGE | 30 | {1949}-09-14 | 28 | {1929}-09-18 | 10-13 | 11-01 | 11-10 |
ROCK VALLEY | 32 | {2007,2011}-09-15 | 28 | {1995}-09-22 | 10-12 | 10-31 | 11-10 |
SIOUX CITY ANG | 31 | {2012}-09-23 | 20 | {2004}-10-02 | 10-12 | 10-26 | 11-10 |
HOLSTEIN 5 NNW | 30 | {2020}-10-02 | 28 | {2019}-10-12 | 10-12 | 10-25 | 11-10 |
JEFFERSON | 32 | {1893}-08-29 | 28 | {1929}-09-18 | 10-17 | 11-02 | 11-11 |
ALLISON | 32 | {1915}-08-30 | 28 | {1926}-09-25 | 10-17 | 11-02 | 11-11 |
DECORAH-2-N | 32 | {1915}-08-30 | 28 | {1946}-09-02 | 10-10 | 11-01 | 11-11 |
GUTHRIE-CENTER | 31 | {1893}-09-02 | 28 | {1991}-09-19 | 10-17 | 11-02 | 11-11 |
Postville | 32 | {1919}-09-02 | 20 | {1918}-09-21 | 10-17 | 11-02 | 11-11 |
FORT-DODGE | 32 | {1974}-09-03 | 27 | {1902}-09-13 | 10-17 | 11-02 | 11-11 |
OAKLAND-2-E | 32 | {1974}-09-03 | 28 | {1995}-09-22 | 10-17 | 11-03 | 11-11 |
SAC-CITY | 32 | {1974}-09-03 | 28 | {1918}-09-20 | 10-16 | 11-01 | 11-11 |
Oelwein Area | 20 | {1942}-09-05 | 20 | {1942}-09-05 | 10-16 | 11-02 | 11-11 |
GRINNELL-3-SW | 31 | {1976}-09-10 | 27 | {1991}-09-20 | 10-17 | 11-02 | 11-11 |
CASCADE | 32 | -09-11 | 28 | {1953,1974}-09-22 | 10-10 | 11-03 | 11-11 |
TOLEDO | 31 | -09-11 | 27 | {1896}-09-20 | 10-17 | 11-02 | 11-11 |
WATERLOO | 32 | -09-11 | 28 | {1929}-09-18 | 10-13 | 11-02 | 11-11 |
Waterloo Area | 32 | -09-11 | 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 |
CHARLES-CITY | 32 | {1902,1955}-09-12 | 28 | {1991}-09-20 | 10-16 | 11-02 | 11-11 |
DENISON | 29 | {1902}-09-12 | 21 | {1918}-09-21 | 10-18 | 11-02 | 11-11 |
GRUNDY-CENTER | 32 | {1902}-09-12 | 28 | {1929}-09-18 | 10-13 | 11-02 | 11-11 |
LOGAN | 30 | {1902}-09-12 | 28 | {1902}-09-13 | 10-17 | 11-02 | 11-11 |
MARSHALLTOWN | 31 | {1955}-09-12 | 28 | {1896}-09-20 | 10-13 | 11-02 | 11-11 |
PERRY | 32 | {1955}-09-12 | 27 | {1929}-09-18 | 10-17 | 11-02 | 11-11 |
Iowa - West Central Climate Division | 31 | {1902}-09-12 | 28 | {1918}-09-20 | 10-17 | 11-02 | 11-11 |
Iowa Drought Region 2 - Northcentral | 32 | {1902}-09-12 | 27 | {1913}-09-22 | 10-17 | 11-01 | 11-11 |
Iowa Average | 32 | {1902}-09-13 | 24 | {1942}-09-28 | 10-17 | 11-02 | 11-11 |
LOWDEN | 32 | {2014}-09-13 | 26 | {2012}-09-24 | 10-13 | 11-01 | 11-11 |
MANCHESTER-2 | 32 | {2014}-09-13 | 27 | {1984}-09-16 | 10-13 | 11-02 | 11-11 |
STANLEY | 31 | {2014}-09-13 | 26 | {2012}-09-23 | 10-11 | 10-26 | 11-11 |
Iowa - Northeast Climate Division | 32 | {1902}-09-13 | 28 | {1974}-09-22 | 10-13 | 11-02 | 11-11 |
Ames Area | 31 | {1902}-09-13 | 26 | {1918}-09-21 | 10-17 | 11-02 | 11-11 |
LITTLE SIOUX 2NW | 31 | {2007}-09-15 | 27 | {2012}-09-23 | 10-08 | 10-25 | 11-11 |
MARSHALLTOWN MUNICIPAL AP | 30 | {2007}-09-15 | 27 | {2012}-09-23 | 10-14 | 10-31 | 11-11 |
OELWEIN 1E | 32 | {2011}-09-15 | 28 | {2012}-10-05 | 10-13 | 10-29 | 11-11 |
OGDEN | 32 | {2007}-09-15 | 26 | {2003}-10-02 | 10-14 | 11-07 | 11-11 |
Iowa - Central Climate Division | 32 | {2007}-09-15 | 28 | {1913}-09-22 | 10-17 | 11-02 | 11-11 |
AMES MUNICIPAL AP | 31 | {2007}-09-15 | 27 | {2003}-09-30 | 10-13 | 10-31 | 11-11 |
DAVENPORT WFO | 30 | {2012}-09-23 | 27 | {2012}-10-05 | 10-15 | 10-29 | 11-11 |
BELLE-PLAINE | 31 | -09-11 | 28 | {1916,1929}-09-18 | 10-17 | 11-03 | 11-12 |
MAQUOKETA-2-W | 31 | -09-11 | 28 | {1983}-09-23 | 10-17 | 11-03 | 11-12 |
WILLIAMSBURG | 32 | -09-11 | 28 | {1991}-09-20 | 10-18 | 11-03 | 11-12 |
AMES-8-WSW | 31 | {1902}-09-13 | 26 | {1918}-09-21 | 10-18 | 11-03 | 11-12 |
VINTON | 32 | {1902,1953}-09-13 | 28 | {1982}-09-21 | 10-17 | 11-03 | 11-12 |
Iowa Drought Region 3 - Northeast | 32 | {1902}-09-13 | 27 | {1926}-09-26 | 10-17 | 11-03 | 11-12 |
Dubuque Airport | 32 | {2007}-09-15 | 28 | {1956}-09-20 | 10-17 | 11-03 | 11-12 |
Cedar Rapids Airport | 31 | {2007}-09-15 | 28 | {2012}-09-24 | 10-17 | 11-05 | 11-12 |
DES MOINES WSFO-JOHNSTON | 31 | {1999}-09-21 | 28 | {2004}-10-02 | 10-21 | 11-10 | 11-12 |
ANAMOSA 3 SSW | 30 | {2012}-09-24 | 26 | {2015}-10-17 | 10-13 | 10-29 | 11-12 |
CORNING | 32 | {1902}-09-12 | 27 | {1983}-09-21 | 10-17 | 11-03 | 11-13 |
Iowa Drought Region 4 - Southwest | 32 | {1902}-09-12 | 26 | {1942}-09-28 | 10-19 | 11-03 | 11-13 |
Creston | 31 | {1924}-09-15 | 28 | {1991}-09-19 | 10-18 | 11-03 | 11-13 |
CLARINDA | 31 | {1902}-09-13 | 28 | {1918}-09-21 | 10-19 | 11-03 | 11-19 |
MOUNT-AYR | 32 | {1902}-09-13 | 28 | {1991}-09-19 | 10-19 | 11-05 | 11-19 |
Iowa - Southwest Climate Division | 32 | {1902}-09-13 | 26 | {1942}-09-28 | 10-19 | 11-05 | 11-19 |
Cedar Rapids Area | 31 | {2007}-09-15 | 28 | {2012}-09-24 | 10-18 | 11-03 | 11-19 |
AMES 5 SE | 32 | {1902}-09-13 | 28 | {1926}-09-26 | 10-19 | 11-04 | 11-20 |
BEACONSFIELD | 27 | {1991}-09-19 | 27 | {1991}-09-19 | 10-19 | 11-05 | 11-20 |
LAMONI | 29 | {2004}-10-02 | 27 | {2012}-10-06 | 10-24 | 11-10 | 11-20 |
BELLEVUE-L-AND-D-12 | 32 | {1986}-08-30 | 28 | {1974,1995}-09-23 | 10-17 | 11-06 | 11-21 |
RED-OAK | 32 | -09-11 | 28 | {1995}-09-22 | 10-19 | 11-03 | 11-21 |
CHARITON | 32 | {1955}-09-12 | 28 | {1918,1991}-09-20 | 10-17 | 11-05 | 11-21 |
WINTERSET | 31 | {1955}-09-12 | 26 | {1896}-09-20 | 10-19 | 11-07 | 11-21 |
OSKALOOSA | 31 | {1902}-09-13 | 27 | {1991}-09-20 | 10-19 | 11-08 | 11-21 |
SIGOURNEY | 32 | {1902}-09-13 | 25 | {1913}-09-21 | 10-19 | 11-08 | 11-21 |
WASHINGTON | 30 | {1902}-09-13 | 28 | {1983}-09-23 | 10-19 | 11-08 | 11-21 |
Iowa City | 32 | {1923}-09-14 | 28 | {1916}-09-18 | 10-19 | 11-06 | 11-21 |
OSCEOLA-3-WSW | 31 | {2007}-09-15 | 28 | {1974}-09-22 | 10-19 | 11-07 | 11-21 |
Dubuque Area | 32 | {2007}-09-15 | 28 | {1956}-09-20 | 10-19 | 11-05 | 11-21 |
CEDAR-RAPIDS-1 | 32 | {2007}-09-15 | 24 | {1926}-09-26 | 10-20 | 11-06 | 11-21 |
SHENANDOAH-1-NE | 32 | {1937}-09-16 | 28 | {1918}-09-20 | 10-19 | 11-07 | 11-21 |
GREENFIELD | 32 | {1981}-09-17 | 27 | {1913}-09-22 | 10-19 | 11-08 | 11-21 |
GUTTENBERG-L-AND-D-10 | 32 | {1973}-09-18 | 25 | {1942}-09-28 | 10-19 | 11-07 | 11-21 |
KNOXVILLE | 31 | {1916}-09-18 | 28 | {1926}-09-26 | 10-24 | 11-08 | 11-21 |
Lamoni | 32 | {1901}-09-18 | 27 | {1942}-09-28 | 10-24 | 11-08 | 11-21 |
NEWTON | 32 | {1929}-09-18 | 23 | {1942}-09-28 | 10-20 | 11-06 | 11-21 |
Iowa - East Central Climate Division | 32 | {1929}-09-18 | 28 | {1926}-09-26 | 10-18 | 11-05 | 11-21 |
Allerton | 31 | {1991}-09-19 | 27 | {1913}-09-22 | 10-19 | 11-08 | 11-21 |
Iowa - South Central Climate Division | 32 | {1991}-09-19 | 25 | {1942}-09-28 | 10-19 | 11-08 | 11-21 |
IOWA CITY MUNICIPAL AP | 32 | {1991}-09-20 | 26 | {1995}-09-23 | 10-19 | 11-07 | 11-21 |
MUSCATINE | 29 | {1991}-09-20 | 23 | {1942}-09-28 | 10-24 | 11-10 | 11-21 |
Iowa Drought Region 5 - Southeast | 32 | {1991}-09-20 | 24 | {1942}-09-28 | 10-19 | 11-08 | 11-21 |
Des Moines Airport | 31 | {1995}-09-22 | 26 | {1942}-09-28 | 10-24 | 11-08 | 11-21 |
RATHBUN DAM | 32 | {1974}-09-22 | 28 | {1985}-10-01 | 10-18 | 11-08 | 11-21 |
Des Moines Area | 31 | {1995}-09-22 | 26 | {1942}-09-28 | 10-24 | 11-08 | 11-21 |
FAIRFIELD | 32 | -09-11 | 28 | {1918}-09-21 | 10-24 | 11-08 | 11-22 |
KEOSAUQUA | 31 | -09-11 | 28 | {1916}-09-18 | 10-24 | 11-09 | 11-22 |
COLUMBUS JUNCT 2 SSW | 31 | {1955}-09-12 | 28 | {1991}-09-20 | 10-24 | 11-08 | 11-22 |
CENTERVILLE | 31 | {1913}-09-13 | 28 | {1913}-09-22 | 10-25 | 11-10 | 11-22 |
CLINTON-1 | 31 | {1902}-09-13 | 28 | {1928}-09-25 | 10-20 | 11-09 | 11-22 |
MOUNT-PLEASANT | 32 | {1902}-09-13 | 28 | {1942}-09-24 | 10-25 | 11-10 | 11-22 |
Ottumwa | 32 | {2007}-09-15 | 23 | {1942}-09-28 | 10-24 | 11-09 | 11-22 |
Donnellson | 31 | {1991}-09-20 | 25 | {1942}-09-28 | 10-19 | 11-10 | 11-22 |
DUBUQUE-LOCK-AND-DAM | 31 | {1956}-09-20 | 24 | {1899}-09-30 | 10-25 | 11-10 | 11-22 |
Iowa - Southeast Climate Division | 32 | {1896}-09-20 | 25 | {1942}-09-28 | 10-24 | 11-08 | 11-22 |
MUSCATINE 2N | 27 | {2003}-10-02 | 27 | {2003}-10-02 | 10-17 | 11-11 | 11-22 |
Le Claire L&D 14 | 32 | {1942}-09-26 | 28 | {1942}-09-28 | 10-28 | 11-11 | 11-23 |
Burlington Airport | 30 | {1918}-09-18 | 25 | {1942}-09-28 | 10-27 | 11-10 | 11-24 |
Fort Madison | 32 | {1913}-09-22 | 26 | {1942}-09-28 | 10-27 | 11-11 | 11-24 |
BURLINGTON | 32 | {1984}-09-26 | 28 | {1974}-10-02 | 10-27 | 11-11 | 11-27 |
NORTHWOOD | -10 | {1929}-11-29 | -10 | {1929}-11-29 | 11-29 | 11-29 | 11-29 |