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: |
BELLE-PLAINE | 31 | -09-11 | 28 | {1916,1929}-09-18 | 10-17 | 11-03 | 11-12 |
CASCADE | 32 | -09-11 | 28 | {1953,1974}-09-22 | 10-10 | 11-03 | 11-11 |
FAIRFIELD | 32 | -09-11 | 28 | {1918}-09-21 | 10-24 | 11-08 | 11-22 |
HAMPTON-2-NW | 32 | -09-11 | 28 | {1955}-09-12 | 10-13 | 11-01 | 11-10 |
KEOSAUQUA | 31 | -09-11 | 28 | {1916}-09-18 | 10-24 | 11-09 | 11-22 |
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 |
MAQUOKETA-2-W | 31 | -09-11 | 28 | {1983}-09-23 | 10-17 | 11-03 | 11-12 |
RED-OAK | 32 | -09-11 | 28 | {1995}-09-22 | 10-19 | 11-03 | 11-21 |
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 |
WEBSTER-CITY | 30 | -09-11 | 25 | {1929}-09-18 | 10-12 | 10-28 | 11-10 |
WILLIAMSBURG | 32 | -09-11 | 28 | {1991}-09-20 | 10-18 | 11-03 | 11-12 |
Waterloo Area | 32 | -09-11 | 28 | {1929}-09-18 | 10-13 | 11-02 | 11-11 |
Elkader 6SSW (Osborn) | 32 | {1893}-08-29 | 0 | {2002}-09-02 | 10-09 | 10-27 | 11-10 |
JEFFERSON | 32 | {1893}-08-29 | 28 | {1929}-09-18 | 10-17 | 11-02 | 11-11 |
ATLANTIC-1-NE | 30 | {1893}-09-02 | 28 | {1902,1955}-09-12 | 10-17 | 11-01 | 11-10 |
ALGONA | 29 | {1893}-09-02 | 27 | {1929}-09-18 | 10-17 | 11-01 | 11-10 |
GUTHRIE-CENTER | 31 | {1893}-09-02 | 28 | {1991}-09-19 | 10-17 | 11-02 | 11-11 |
Iowa - Southeast Climate Division | 32 | {1896}-09-20 | 25 | {1942}-09-28 | 10-24 | 11-08 | 11-22 |
Lamoni | 32 | {1901}-09-18 | 27 | {1942}-09-28 | 10-24 | 11-08 | 11-21 |
VINTON | 32 | {1902,1953}-09-13 | 28 | {1982}-09-21 | 10-17 | 11-03 | 11-12 |
AUDUBON | 30 | {1902,1955}-09-12 | 27 | {1896}-09-19 | 10-17 | 11-01 | 11-10 |
CHARLES-CITY | 32 | {1902,1955}-09-12 | 28 | {1991}-09-20 | 10-16 | 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 Drought Region 4 - Southwest | 32 | {1902}-09-12 | 26 | {1942}-09-28 | 10-19 | 11-03 | 11-13 |
CORNING | 32 | {1902}-09-12 | 27 | {1983}-09-21 | 10-17 | 11-03 | 11-13 |
DENISON | 29 | {1902}-09-12 | 21 | {1918}-09-21 | 10-18 | 11-02 | 11-11 |
Emmetsburg | 32 | {1902}-09-12 | 28 | {1929}-09-18 | 10-13 | 11-01 | 11-10 |
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 |
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 |
Iowa Average | 32 | {1902}-09-13 | 24 | {1942}-09-28 | 10-17 | 11-02 | 11-11 |
AMES-8-WSW | 31 | {1902}-09-13 | 26 | {1918}-09-21 | 10-18 | 11-03 | 11-12 |
AMES 5 SE | 32 | {1902}-09-13 | 28 | {1926}-09-26 | 10-19 | 11-04 | 11-20 |
CLARINDA | 31 | {1902}-09-13 | 28 | {1918}-09-21 | 10-19 | 11-03 | 11-19 |
CLINTON-1 | 31 | {1902}-09-13 | 28 | {1928}-09-25 | 10-20 | 11-09 | 11-22 |
MOUNT-AYR | 32 | {1902}-09-13 | 28 | {1991}-09-19 | 10-19 | 11-05 | 11-19 |
MOUNT-PLEASANT | 32 | {1902}-09-13 | 28 | {1942}-09-24 | 10-25 | 11-10 | 11-22 |
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 |
SIOUX-CITY-WSO-AP | 30 | {1902}-09-13 | 25 | {1995}-09-22 | 10-17 | 11-02 | 11-10 |
WASHINGTON | 30 | {1902}-09-13 | 28 | {1983}-09-23 | 10-19 | 11-08 | 11-21 |
Iowa - North Central Climate Division | 32 | {1902}-09-13 | 28 | {1929}-09-18 | 10-12 | 11-01 | 11-10 |
Iowa - Northeast Climate Division | 32 | {1902}-09-13 | 28 | {1974}-09-22 | 10-13 | 11-02 | 11-11 |
Iowa - Southwest Climate Division | 32 | {1902}-09-13 | 26 | {1942}-09-28 | 10-19 | 11-05 | 11-19 |
Iowa Drought Region 3 - Northeast | 32 | {1902}-09-13 | 27 | {1926}-09-26 | 10-17 | 11-03 | 11-12 |
Ames Area | 31 | {1902}-09-13 | 26 | {1918}-09-21 | 10-17 | 11-02 | 11-11 |
Sioux City Area | 30 | {1902}-09-13 | 25 | {1995}-09-22 | 10-17 | 11-02 | 11-10 |
CENTERVILLE | 31 | {1913}-09-13 | 28 | {1913}-09-22 | 10-25 | 11-10 | 11-22 |
Fort Madison | 32 | {1913}-09-22 | 26 | {1942}-09-28 | 10-27 | 11-11 | 11-24 |
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 |
IOWA-FALLS | 31 | {1915}-08-30 | 28 | {1894}-09-18 | 10-12 | 11-01 | 11-10 |
MASON-CITY | 30 | {1915}-08-30 | 28 | {1923}-09-14 | 10-10 | 10-28 | 11-09 |
KNOXVILLE | 31 | {1916}-09-18 | 28 | {1926}-09-26 | 10-24 | 11-08 | 11-21 |
Burlington Airport | 30 | {1918}-09-18 | 25 | {1942}-09-28 | 10-27 | 11-10 | 11-24 |
Postville | 32 | {1919}-09-02 | 20 | {1918}-09-21 | 10-17 | 11-02 | 11-11 |
Iowa City | 32 | {1923}-09-14 | 28 | {1916}-09-18 | 10-19 | 11-06 | 11-21 |
Estherville 4E | 32 | {1924}-09-09 | 27 | {1929}-09-18 | 10-07 | 10-27 | 11-06 |
Creston | 31 | {1924}-09-15 | 28 | {1991}-09-19 | 10-18 | 11-03 | 11-13 |
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 |
NORTHWOOD | -10 | {1929}-11-29 | -10 | {1929}-11-29 | 11-29 | 11-29 | 11-29 |
SHENANDOAH-1-NE | 32 | {1937}-09-16 | 28 | {1918}-09-20 | 10-19 | 11-07 | 11-21 |
LAKE PARK | 30 | {1940}-09-12 | 28 | {1916}-09-15 | 10-12 | 10-28 | 11-08 |
Oelwein Area | 20 | {1942}-09-05 | 20 | {1942}-09-05 | 10-16 | 11-02 | 11-11 |
Le Claire L&D 14 | 32 | {1942}-09-26 | 28 | {1942}-09-28 | 10-28 | 11-11 | 11-23 |
POCAHONTAS | 31 | {1946}-09-02 | 27 | {1929}-09-18 | 10-10 | 10-28 | 11-10 |
FAYETTE | 32 | {1949}-09-01 | 27 | {1902}-09-12 | 10-10 | 10-28 | 11-10 |
FOREST-CITY | 31 | {1949}-09-01 | 27 | {1929}-09-18 | 10-13 | 10-28 | 11-09 |
NEW-HAMPTON | 28 | {1949}-09-01 | 28 | {1949}-09-01 | 10-13 | 11-01 | 11-10 |
OSAGE | 30 | {1949}-09-14 | 28 | {1929}-09-18 | 10-13 | 11-01 | 11-10 |
SIBLEY-5-NNE | 30 | {1950}-08-20 | 23 | -09-11 | 10-07 | 10-26 | 11-03 |
WINTERSET | 31 | {1955}-09-12 | 26 | {1896}-09-20 | 10-19 | 11-07 | 11-21 |
CHARITON | 32 | {1955}-09-12 | 28 | {1918,1991}-09-20 | 10-17 | 11-05 | 11-21 |
COLUMBUS JUNCT 2 SSW | 31 | {1955}-09-12 | 28 | {1991}-09-20 | 10-24 | 11-08 | 11-22 |
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 |
DUBUQUE-LOCK-AND-DAM | 31 | {1956}-09-20 | 24 | {1899}-09-30 | 10-25 | 11-10 | 11-22 |
GUTTENBERG-L-AND-D-10 | 32 | {1973}-09-18 | 25 | {1942}-09-28 | 10-19 | 11-07 | 11-21 |
CARROLL-2-SSW | 28 | {1974}-09-03 | 28 | {1974}-09-03 | 10-16 | 11-01 | 11-10 |
CHEROKEE | 31 | {1974}-09-03 | 27 | -09-11 | 10-07 | 10-27 | 11-07 |
FORT-DODGE | 32 | {1974}-09-03 | 27 | {1902}-09-13 | 10-17 | 11-02 | 11-11 |
Milford | 32 | {1974}-09-03 | 28 | {1929}-09-18 | 10-13 | 10-31 | 11-08 |
OAKLAND-2-E | 32 | {1974}-09-03 | 28 | {1995}-09-22 | 10-17 | 11-03 | 11-11 |
ROCK-RAPIDS | 31 | {1974}-09-03 | 26 | {1894}-09-10 | 10-07 | 10-24 | 11-05 |
SAC-CITY | 32 | {1974}-09-03 | 28 | {1918}-09-20 | 10-16 | 11-01 | 11-11 |
SANBORN | 32 | {1974}-09-03 | 25 | {1929}-09-18 | 10-10 | 10-27 | 11-07 |
SIOUX CENTER 2 SE | 31 | {1974}-09-03 | 24 | {1991}-09-19 | 10-16 | 10-28 | 11-10 |
SIOUX-RAPIDS | 31 | {1974}-09-03 | 28 | {1991}-09-19 | 10-09 | 10-27 | 11-07 |
Spencer | 31 | {1974}-09-03 | 28 | {2007}-09-15 | 10-09 | 10-27 | 11-08 |
SWEA CITY 4 W | 32 | {1974}-09-03 | 26 | {1974}-09-22 | 10-09 | 10-29 | 11-10 |
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 |
Ida Grove Area | 32 | {1974}-09-03 | 27 | {1918}-09-20 | 10-16 | 10-31 | 11-10 |
Spencer Area | 31 | {1974}-09-03 | 28 | {2007}-09-15 | 10-09 | 10-27 | 11-08 |
RATHBUN DAM | 32 | {1974}-09-22 | 28 | {1985}-10-01 | 10-18 | 11-08 | 11-21 |
Boone | 32 | {1975}-09-12 | 27 | {1929}-09-18 | 10-17 | 11-02 | 11-11 |
GRINNELL-3-SW | 31 | {1976}-09-10 | 27 | {1991}-09-20 | 10-17 | 11-02 | 11-11 |
GREENFIELD | 32 | {1981}-09-17 | 27 | {1913}-09-22 | 10-19 | 11-08 | 11-21 |
BURLINGTON | 32 | {1984}-09-26 | 28 | {1974}-10-02 | 10-27 | 11-11 | 11-27 |
BELLEVUE-L-AND-D-12 | 32 | {1986}-08-30 | 28 | {1974,1995}-09-23 | 10-17 | 11-06 | 11-21 |
Allerton | 31 | {1991}-09-19 | 27 | {1913}-09-22 | 10-19 | 11-08 | 11-21 |
BEACONSFIELD | 27 | {1991}-09-19 | 27 | {1991}-09-19 | 10-19 | 11-05 | 11-20 |
Iowa - South Central Climate Division | 32 | {1991}-09-19 | 25 | {1942}-09-28 | 10-19 | 11-08 | 11-21 |
Donnellson | 31 | {1991}-09-20 | 25 | {1942}-09-28 | 10-19 | 11-10 | 11-22 |
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 |
Des Moines Area | 31 | {1995}-09-22 | 26 | {1942}-09-28 | 10-24 | 11-08 | 11-21 |
DES MOINES WSFO-JOHNSTON | 31 | {1999}-09-21 | 28 | {2004}-10-02 | 10-21 | 11-10 | 11-12 |
MUSCATINE 2N | 27 | {2003}-10-02 | 27 | {2003}-10-02 | 10-17 | 11-11 | 11-22 |
LAMONI | 29 | {2004}-10-02 | 27 | {2012}-10-06 | 10-24 | 11-10 | 11-20 |
ROCK VALLEY | 32 | {2007,2011}-09-15 | 28 | {1995}-09-22 | 10-12 | 10-31 | 11-10 |
AMES MUNICIPAL AP | 31 | {2007}-09-15 | 27 | {2003}-09-30 | 10-13 | 10-31 | 11-11 |
Cedar Rapids Airport | 31 | {2007}-09-15 | 28 | {2012}-09-24 | 10-17 | 11-05 | 11-12 |
CEDAR-RAPIDS-1 | 32 | {2007}-09-15 | 24 | {1926}-09-26 | 10-20 | 11-06 | 11-21 |
Dubuque Airport | 32 | {2007}-09-15 | 28 | {1956}-09-20 | 10-17 | 11-03 | 11-12 |
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 |
OGDEN | 32 | {2007}-09-15 | 26 | {2003}-10-02 | 10-14 | 11-07 | 11-11 |
OSCEOLA-3-WSW | 31 | {2007}-09-15 | 28 | {1974}-09-22 | 10-19 | 11-07 | 11-21 |
Ottumwa | 32 | {2007}-09-15 | 23 | {1942}-09-28 | 10-24 | 11-09 | 11-22 |
Iowa - Central Climate Division | 32 | {2007}-09-15 | 28 | {1913}-09-22 | 10-17 | 11-02 | 11-11 |
Cedar Rapids Area | 31 | {2007}-09-15 | 28 | {2012}-09-24 | 10-18 | 11-03 | 11-19 |
Dubuque Area | 32 | {2007}-09-15 | 28 | {1956}-09-20 | 10-19 | 11-05 | 11-21 |
OELWEIN 1E | 32 | {2011}-09-15 | 28 | {2012}-10-05 | 10-13 | 10-29 | 11-11 |
DAVENPORT WFO | 30 | {2012}-09-23 | 27 | {2012}-10-05 | 10-15 | 10-29 | 11-11 |
SIOUX CITY ANG | 31 | {2012}-09-23 | 20 | {2004}-10-02 | 10-12 | 10-26 | 11-10 |
ANAMOSA 3 SSW | 30 | {2012}-09-24 | 26 | {2015}-10-17 | 10-13 | 10-29 | 11-12 |
BATTLE CREEK 3NE | 32 | {2014}-09-13 | 24 | {2012}-09-23 | 10-04 | 10-15 | 10-31 |
ESTHERVILLE MUNICIPAL AP | 31 | {2014}-09-13 | 28 | {2007}-09-15 | 10-10 | 10-24 | 11-07 |
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 |
MASON CITY MUNICIPAL AP | 31 | {2014}-09-13 | 26 | {2011}-09-15 | 10-09 | 10-28 | 11-07 |
STANLEY | 31 | {2014}-09-13 | 26 | {2012}-09-23 | 10-11 | 10-26 | 11-11 |
Spencer Airport | 32 | {2014}-09-13 | 28 | {2007}-09-15 | 10-04 | 10-24 | 11-10 |
HOLSTEIN 5 NNW | 30 | {2020}-10-02 | 28 | {2019}-10-12 | 10-12 | 10-25 | 11-10 |