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Iowa State University Department of Agronomy

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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:
Iowa Average 31 1902-09-13 27 1926-09-26 10-19 11-03 11-19
ALBIA 31 1991-09-19 25 1984-09-29 10-25 11-06 11-21
ALGONA 29 1893-09-02 27 1929-09-18 10-17 11-02 11-10
ALLISON 30 1991-09-20 28 1984-09-26 10-18 11-03 11-16
AMES-8-WSW 31 1902-09-13 26 1918-09-21 10-18 11-02 11-12
ANAMOSA-1-WNW 29 1955-09-12 27 1956-09-20 10-10 11-03 11-12
ANKENY-3-S 32 1991-09-20 28 1984-09-26 10-18 11-04 11-20
ATLANTIC-1-NE 30 1893-09-02 28 1902-09-12 10-17 11-02 11-10
AUDUBON 30 1955-09-12 28 1991-09-20 10-10 11-02 11-10
BEDFORD-1-NNW 27 1991-09-19 27 1991-09-19 10-19 11-04 11-20
BELLE-PLAINE 32 1955-09-12 28 1991-09-20 10-18 11-04 11-19
BELLEVUE-L-AND-D-12 31 1991-09-20 25 1995-09-23 10-18 11-04 11-21
BLOOMFIELD 31 1991-09-20 25 1974-10-02 10-19 11-05 11-21
Boone 32 1975-09-12 28 1981-09-18 10-10 11-01 11-04
BRITT 31 2007-09-15 25 1983-09-22 10-09 11-02 11-08
Burlington 32 1991-09-20 26 2003-10-02 10-27 11-10 11-24
CARROLL-2-SSW 28 1974-09-03 28 1974-09-03 10-07 10-29 11-08
CASCADE 32 1955-09-11 28 1953-09-22 10-07 11-03 11-10
CASTANA-EXP-FARM 30 1991-09-19 28 1995-09-22 10-18 11-03 11-19
CEDAR-RAPIDS-1 32 2007-09-15 24 1926-09-26 10-19 11-05 11-21
CENTERVILLE 32 1991-09-19 27 1979-10-05 10-19 11-05 11-23
CHARITON 32 1955-09-12 28 1991-09-20 10-18 11-04 11-20
CHARLES-CITY 32 1955-09-12 28 1991-09-20 10-10 11-03 11-10
CHEROKEE 31 1974-09-03 27 1955-09-11 10-07 10-26 11-04
CLARINDA 31 1902-09-13 28 1918-09-21 10-19 11-03 11-19
CLARION 32 1974-09-03 25 1974-09-22 10-09 10-28 11-07
CLINTON-1 22 1924-08-31 22 1924-08-31 10-19 11-06 11-22
CORNING 32 1902-09-12 27 1983-09-21 10-18 11-03 11-19
CRESCO-1-NE 31 1975-09-13 27 1991-09-20 10-07 10-29 11-05
Creston 28 1991-09-19 28 1991-09-19 10-18 11-03 11-20
DECORAH-2-N 32 1915-08-30 28 1946-09-02 10-10 11-02 11-10
DENISON 29 1902-09-12 21 1918-09-21 10-18 11-02 11-12
Des Moines Airport 31 1995-09-22 28 1984-09-29 10-19 11-05 11-20
DUBUQUE-LOCK-AND-DAM 31 1956-09-20 24 1899-09-30 10-25 11-10 11-22
Eldora 32 1962-09-20 28 1974-09-22 10-10 11-03 11-10
EMMETSBURG 31 1991-09-19 24 1995-09-22 10-10 11-02 11-08
ESTHERVILLE-2-N 30 2007-09-15 28 1991-09-20 10-07 10-28 11-05
FAIRFIELD 32 1917-09-11 28 1918-09-21 10-24 11-08 11-22
FAYETTE 32 1949-09-01 27 1902-09-12 10-10 10-28 11-10
FOREST-CITY 31 2007-09-15 26 1974-09-22 10-09 11-02 11-08
FORT-DODGE 32 1974-09-03 28 1995-09-22 10-09 11-02 11-10
FORT-MADISON 32 1983-09-23 27 1974-10-02 10-28 11-10 11-24
GLENWOOD 27 1901-09-18 27 1901-09-18 10-19 11-04 11-21
GREENFIELD 32 1981-09-17 28 1995-09-22 10-19 11-04 11-20
GRINNELL-3-SW 31 1976-09-10 27 1991-09-20 10-17 11-03 11-12
GRUNDY-CENTER 31 2007-09-15 27 1974-09-22 10-07 10-29 11-07
GUTHRIE-CENTER 31 1893-09-02 28 1991-09-19 10-17 11-02 11-11
GUTTENBERG-L-AND-D-10 32 1973-09-18 28 1984-09-29 10-19 11-05 11-21
HAMPTON-2-NW 32 1955-09-11 28 1955-09-12 10-17 11-02 11-10
HARLAN 29 1991-09-19 27 1951-09-28 10-17 11-03 11-10
HAWARDEN 31 1974-09-03 24 1991-09-19 10-09 10-28 11-04
HUMBOLDT-2 32 1976-09-17 26 1974-09-22 10-09 11-02 11-07
INDEPENDENCE-2-W 32 1974-09-03 28 1975-09-13 10-10 11-03 11-10
INDIANOLA-2-SSW 30 1979-09-15 28 1979-09-22 10-19 11-08 11-21
IOWA-CITY 32 1956-09-20 24 1958-10-01 10-19 11-06 11-21
IOWA-FALLS 32 1976-09-10 26 1974-09-22 10-10 11-02 11-07
JEFFERSON 32 2007-09-16 23 1974-10-02 10-18 11-04 11-19
KEOSAUQUA 31 1917-09-11 28 1916-09-18 10-24 11-09 11-22
KNOXVILLE 31 1991-09-19 27 1974-10-02 10-19 11-07 11-21
Lamoni 32 1991-09-19 24 1974-10-02 10-19 11-05 11-21
Le Claire L&D 14 32 1984-09-29 25 1974-10-02 10-28 11-11 11-24
LEMARS 25 1893-09-02 25 1893-09-02 10-17 10-29 11-08
LOGAN 30 1902-09-12 28 1902-09-13 10-18 11-02 11-12
MANCHESTER-2 29 2007-09-15 27 1984-09-16 10-07 10-28 11-09
MAQUOKETA-2-W 31 1917-09-11 28 1983-09-23 10-17 11-04 11-13
MARSHALLTOWN 31 1955-09-12 28 1896-09-20 10-17 11-02 11-11
MASON-CITY 30 1915-08-30 28 1923-09-14 10-10 11-01 11-08
MOUNT-AYR 32 1902-09-13 28 1991-09-19 10-23 11-05 11-21
MOUNT-PLEASANT 29 1991-09-20 25 1974-10-02 10-19 11-10 11-21
MUSCATINE 29 1991-09-20 26 1984-09-29 10-19 11-10 11-24
NEW-HAMPTON 28 1949-09-01 28 1949-09-01 10-17 11-02 11-10
NEWTON 29 1974-09-22 27 1972-09-30 10-18 11-05 11-21
NORTHWOOD 31 1953-09-13 26 1974-09-22 10-09 11-02 11-05
OAKLAND-2-E 32 1974-09-03 28 1995-09-22 10-10 11-03 11-10
OELWEIN-2-S 28 1955-09-11 28 1955-09-11 10-10 11-02 11-10
ONAWA 30 1955-09-11 28 1991-09-19 10-19 11-02 11-11
OSAGE 32 2007-09-15 28 1974-09-22 10-17 11-03 11-10
OSCEOLA-3-WSW 31 2007-09-15 28 1974-09-22 10-18 11-04 11-20
OSKALOOSA 31 1902-09-13 27 1991-09-20 10-19 11-05 11-21
Ottumwa 29 1981-08-03 27 1984-09-29 10-24 11-08 11-24
PERRY 32 1955-09-12 28 1974-09-22 10-09 11-03 11-10
POCAHONTAS 30 2007-09-15 28 1983-09-20 10-07 10-28 11-05
PRIMGHAR 31 1984-09-15 27 1991-09-19 10-09 11-02 11-08
RED-OAK 32 1993-09-15 28 1995-09-22 10-18 11-04 11-20
ROCK-RAPIDS 31 1974-09-03 26 1894-09-10 10-06 10-24 11-03
ROCKWELL-CITY 32 1902-09-12 28 1929-09-18 10-17 11-02 11-10
SAC-CITY 32 1974-09-03 27 1974-09-22 10-10 11-02 11-11
Sheldon 32 1974-09-03 28 2007-09-15 10-09 10-28 11-04
SHENANDOAH-1-NE 30 1980-09-17 26 1983-09-23 10-19 11-05 11-20
SIBLEY-5-NNE 30 1974-09-03 23 1955-09-11 10-04 10-26 11-03
SIDNEY 30 1991-09-19 28 1995-09-22 10-27 11-05 11-24
SIGOURNEY 31 1995-09-22 28 1964-09-28 10-19 11-05 11-21
SIOUX-CITY-WSO-AP 32 2007-09-15 25 1995-09-22 10-15 11-02 11-08
SIOUX-RAPIDS 31 1974-09-03 28 1991-09-19 10-09 10-29 11-06
STORM-LAKE-2-E 32 1902-09-12 28 1929-09-18 10-17 11-02 11-08
TIPTON 32 1902-09-13 28 1991-09-20 10-19 11-05 11-21
TOLEDO 31 2007-09-15 28 1962-09-20 10-10 11-03 11-10
TRIPOLI-4-N 31 2007-09-15 27 1974-09-22 10-10 11-03 11-10
VINTON 32 1953-09-13 28 1982-09-21 10-10 11-03 11-20
WASHINGTON 30 1902-09-13 28 1983-09-23 10-24 11-08 11-22
WATERLOO 32 1917-09-11 28 1929-09-18 10-13 11-02 11-10
WAUKON 32 1956-09-20 27 1984-09-26 10-10 11-02 11-09
WEBSTER-CITY 30 1955-09-11 25 1929-09-18 10-13 11-02 11-10
WILLIAMSBURG 31 1955-09-12 28 1991-09-20 10-18 11-04 11-20
WINTERSET 31 1955-09-12 28 1962-09-20 10-18 11-04 11-10