Record envelope, standing records and threshold days for Corydon 8 W (USC00131848), Iowa, United States, with 42 years of record.
Key Facts for Corydon 8 W
Corydon 8 W (USC00131848) is a weather station in Iowa, United States at 40.75 latitude and -93.48 longitude, 329 m (1,080 ft) above sea level.
The station reports from 1950 to 1991, 42 years of record.
1,464 records set at Corydon 8 W still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Corydon 8 W tied a daily record low maximum temperature of 19.4 C (66.9 F) on 6 August 1991.
About the Station
Location: Iowa, United States, 40.75 latitude, -93.48 longitude.
Elevation: 329 m (1,080 ft).
Period of record: 1950 to 1991, 42 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Corydon 8 W. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Corydon 8 W, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.3 C (64.9 F)
-31.1 C (-24.0 F)
n/a
n/a
Feb
21.7 C (71.1 F)
-29.4 C (-20.9 F)
n/a
n/a
Mar
29.4 C (84.9 F)
-26.7 C (-16.1 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-13.3 C (8.1 F)
n/a
n/a
May
34.4 C (93.9 F)
-1.1 C (30.0 F)
n/a
n/a
Jun
38.3 C (100.9 F)
4.4 C (39.9 F)
n/a
n/a
Jul
39.4 C (102.9 F)
7.2 C (45.0 F)
n/a
n/a
Aug
40.0 C (104.0 F)
3.3 C (37.9 F)
n/a
n/a
Sep
37.2 C (99.0 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
34.4 C (93.9 F)
-8.9 C (16.0 F)
n/a
n/a
Nov
26.7 C (80.1 F)
-22.2 C (-8.0 F)
n/a
n/a
Dec
18.9 C (66.0 F)
-31.1 C (-24.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Corydon 8 W still stand. 1954 holds the most, with 54.
Standing records at Corydon 8 W by the year they were set
Year set
Standing records
1951
36
1952
41
1953
51
1954
54
1955
51
1956
47
1957
33
1958
34
1959
35
1960
40
1961
25
1962
48
1963
54
1964
48
1965
49
1966
35
1967
47
1968
28
1969
23
1970
35
1971
31
1972
51
1973
26
1974
39
1975
40
1976
53
1977
31
1978
30
1979
45
1981
26
1982
6
1983
24
1984
25
1985
38
1986
38
1987
1
1988
28
1989
52
1990
42
1991
24
All-Time Record Progression
5 new records
5 all-time records were set at Corydon 8 W between 4 July 1981 and 22 December 1989. Each dot is a new record.
When Corydon 8 W set new all-time records
Date
Kind
Detail
1981-07-04
Record daily precipitation
Record daily precipitation 181.9 mm (7.2 in)
1983-12-20
Record low maximum temperature
Record low maximum temperature -20.6 C (-5.1 F)
1983-12-21
Record low maximum temperature
Record low maximum temperature -22.8 C (-9.0 F)
1983-12-22
Record low maximum temperature
Record low maximum temperature -23.9 C (-11.0 F)
1989-12-22
Record low maximum temperature
Record low maximum temperature -25.0 C (-13.0 F)
Wettest Day of Each Month
Jul: 181.9 mm (7.2 in)
The wettest day on record for each calendar month at Corydon 8 W. The most was 181.9 mm (7.2 in) on 4 July 1981.
Record daily precipitation for each month at Corydon 8 W
Month
Record daily precipitation (mm)
Date
Jan
26.7 mm (1.1 in)
26 January 1962
Feb
41.1 mm (1.6 in)
18 February 1961
Mar
43.7 mm (1.7 in)
30 March 1953
Apr
71.1 mm (2.8 in)
10 April 1978
May
73.2 mm (2.9 in)
21 May 1959
Jun
80.5 mm (3.2 in)
20 June 1964
Jul
181.9 mm (7.2 in)
4 July 1981
Aug
91.9 mm (3.6 in)
6 August 1959
Sep
113.0 mm (4.4 in)
13 September 1961
Oct
83.8 mm (3.3 in)
31 October 1974
Nov
85.1 mm (3.4 in)
2 November 1971
Dec
34.5 mm (1.4 in)
24 December 1965
Period of Record Coverage
1951 to 1991
Complete yearUnder 90 percent of days
40 years of record at Corydon 8 W, 1951 to 1991. 11 years have data for under 90 percent of days and are left out of rankings: 1951, 1952, 1968, 1978, 1981, 1982, 1983, 1984 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 25 complete years at Corydon 8 W, 1953 to 1990. Blue stripes are years cooler than the station's own mean of 10.4 C (50.7 F); red stripes are warmer. The coolest year was 1972, at 8.6 C (47.5 F), and the warmest was 1954, at 11.9 C (53.4 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Corydon 8 W as warming stripes, 1953 to 1990
Year
Annual mean temperature
Difference from the station mean
1953
11.5 C
+1.16 C
1954
11.9 C
+1.50 C
1955
10.6 C
+0.20 C
1956
11.3 C
+0.94 C
1957
10.8 C
+0.47 C
1958
10.4 C
+0.00 C
1959
10.7 C
+0.33 C
1960
10.2 C
-0.18 C
1961
10.5 C
+0.10 C
1962
10.4 C
+0.00 C
1963
11.1 C
+0.71 C
1964
11.7 C
+1.31 C
1965
11.0 C
+0.65 C
1966
10.4 C
+0.04 C
1967
10.5 C
+0.15 C
1969
9.0 C
-1.41 C
1971
9.6 C
-0.78 C
1972
8.6 C
-1.75 C
1973
10.3 C
-0.10 C
1974
9.6 C
-0.81 C
1975
9.8 C
-0.56 C
1976
9.2 C
-1.17 C
1977
9.9 C
-0.51 C
1989
9.3 C
-1.10 C
1990
11.1 C
+0.70 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1950 to 1991
Yearly extremes at Corydon 8 W: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.0 C (104.0 F)
1954
36.1 C (97.0 F)
40
Coldest night (TNn)
-31.1 C (-24.0 F)
1974
-26.4 C (-15.5 F)
40
Wettest day (Rx1day)
181.9 mm (7.2 in)
1981
63.5 mm (2.5 in)
41
Wettest five days (Rx5day)
208.3 mm (8.2 in)
1981
103.6 mm (4.1 in)
41
Longest dry spell (CDD)
42 days
1985
26 days
41
Hottest day (TXx)
The hottest day of the year at Corydon 8 W, 1950 to 1991. The record is 40.0 C (104.0 F) in 1954, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Corydon 8 W by year
Year
Hottest day (TXx)
1950
n/a
1951
35.0 C (95.0 F)
1952
38.3 C (100.9 F)
1953
37.8 C (100.0 F)
1954
40.0 C (104.0 F)
1955
38.9 C (102.0 F)
1956
39.4 C (102.9 F)
1957
37.8 C (100.0 F)
1958
37.2 C (99.0 F)
1959
34.4 C (93.9 F)
1960
35.6 C (96.1 F)
1961
33.3 C (91.9 F)
1962
35.6 C (96.1 F)
1963
37.8 C (100.0 F)
1964
36.1 C (97.0 F)
1965
35.6 C (96.1 F)
1966
37.2 C (99.0 F)
1967
35.6 C (96.1 F)
1968
34.4 C (93.9 F)
1969
33.9 C (93.0 F)
1970
39.4 C (102.9 F)
1971
36.1 C (97.0 F)
1972
35.0 C (95.0 F)
1973
33.9 C (93.0 F)
1974
37.8 C (100.0 F)
1975
37.2 C (99.0 F)
1976
36.1 C (97.0 F)
1977
37.2 C (99.0 F)
1978
34.4 C (93.9 F)
1979
35.6 C (96.1 F)
1981
35.0 C (95.0 F)
1982
31.7 C (89.1 F)
1983
30.6 C (87.1 F)
1984
37.2 C (99.0 F)
1985
35.0 C (95.0 F)
1986
35.6 C (96.1 F)
1987
13.9 C (57.0 F)
1988
38.3 C (100.9 F)
1989
37.8 C (100.0 F)
1990
37.8 C (100.0 F)
1991
36.7 C (98.1 F)
Coldest night (TNn)
The coldest night of the year at Corydon 8 W, 1950 to 1991. The record is -31.1 C (-24.0 F) in 1974, marked on the chart; the median year is -26.4 C (-15.5 F).
Coldest night (TNn) at Corydon 8 W by year
Year
Coldest night (TNn)
1950
n/a
1951
-25.6 C (-14.1 F)
1952
-27.8 C (-18.0 F)
1953
-20.0 C (-4.0 F)
1954
-23.9 C (-11.0 F)
1955
-25.6 C (-14.1 F)
1956
-20.6 C (-5.1 F)
1957
-26.1 C (-15.0 F)
1958
-27.8 C (-18.0 F)
1959
-26.1 C (-15.0 F)
1960
-25.0 C (-13.0 F)
1961
-26.7 C (-16.1 F)
1962
-26.7 C (-16.1 F)
1963
-28.3 C (-18.9 F)
1964
-22.2 C (-8.0 F)
1965
-26.7 C (-16.1 F)
1966
-29.4 C (-20.9 F)
1967
-23.3 C (-9.9 F)
1968
-27.2 C (-17.0 F)
1969
-26.7 C (-16.1 F)
1970
-25.6 C (-14.1 F)
1971
-25.6 C (-14.1 F)
1972
-27.2 C (-17.0 F)
1973
-24.4 C (-11.9 F)
1974
-31.1 C (-24.0 F)
1975
-27.2 C (-17.0 F)
1976
-27.2 C (-17.0 F)
1977
-28.3 C (-18.9 F)
1978
-25.0 C (-13.0 F)
1979
-29.4 C (-20.9 F)
1981
-26.7 C (-16.1 F)
1982
-16.1 C (3.0 F)
1983
-30.0 C (-22.0 F)
1984
-27.8 C (-18.0 F)
1985
-29.4 C (-20.9 F)
1986
-23.9 C (-11.0 F)
1987
-25.0 C (-13.0 F)
1988
-17.2 C (1.0 F)
1989
-31.1 C (-24.0 F)
1990
-23.3 C (-9.9 F)
1991
-21.7 C (-7.1 F)
Wettest day (Rx1day)
The wettest day of the year at Corydon 8 W, 1950 to 1991. The record is 181.9 mm (7.2 in) in 1981, marked on the chart; the median year is 63.5 mm (2.5 in).
Wettest day (Rx1day) at Corydon 8 W by year
Year
Wettest day (Rx1day)
1950
44.7 mm (1.8 in)
1951
40.6 mm (1.6 in)
1952
78.0 mm (3.1 in)
1953
43.7 mm (1.7 in)
1954
82.6 mm (3.3 in)
1955
55.9 mm (2.2 in)
1956
75.9 mm (3.0 in)
1957
52.1 mm (2.1 in)
1958
73.7 mm (2.9 in)
1959
91.9 mm (3.6 in)
1960
60.7 mm (2.4 in)
1961
113.0 mm (4.4 in)
1962
63.5 mm (2.5 in)
1963
57.9 mm (2.3 in)
1964
88.9 mm (3.5 in)
1965
67.3 mm (2.6 in)
1966
52.1 mm (2.1 in)
1967
57.7 mm (2.3 in)
1968
52.1 mm (2.1 in)
1969
45.7 mm (1.8 in)
1970
72.4 mm (2.9 in)
1971
85.1 mm (3.4 in)
1972
67.8 mm (2.7 in)
1973
52.1 mm (2.1 in)
1974
94.0 mm (3.7 in)
1975
66.0 mm (2.6 in)
1976
62.2 mm (2.4 in)
1977
72.4 mm (2.9 in)
1978
72.4 mm (2.9 in)
1979
50.8 mm (2.0 in)
1981
181.9 mm (7.2 in)
1982
61.5 mm (2.4 in)
1983
38.1 mm (1.5 in)
1984
50.8 mm (2.0 in)
1985
99.1 mm (3.9 in)
1986
55.1 mm (2.2 in)
1987
7.6 mm (0.30 in)
1988
70.6 mm (2.8 in)
1989
75.2 mm (3.0 in)
1990
67.8 mm (2.7 in)
1991
48.5 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Corydon 8 W, 1950 to 1991. The record is 208.3 mm (8.2 in) in 1981, marked on the chart; the median year is 103.6 mm (4.1 in).
Wettest five days (Rx5day) at Corydon 8 W by year
Year
Wettest five days (Rx5day)
1950
57.6 mm (2.3 in)
1951
79.0 mm (3.1 in)
1952
137.0 mm (5.4 in)
1953
63.3 mm (2.5 in)
1954
107.3 mm (4.2 in)
1955
75.0 mm (3.0 in)
1956
128.7 mm (5.1 in)
1957
72.9 mm (2.9 in)
1958
106.2 mm (4.2 in)
1959
134.2 mm (5.3 in)
1960
71.9 mm (2.8 in)
1961
146.8 mm (5.8 in)
1962
116.3 mm (4.6 in)
1963
70.9 mm (2.8 in)
1964
139.4 mm (5.5 in)
1965
152.2 mm (6.0 in)
1966
91.5 mm (3.6 in)
1967
109.8 mm (4.3 in)
1968
76.7 mm (3.0 in)
1969
54.3 mm (2.1 in)
1970
136.0 mm (5.4 in)
1971
122.4 mm (4.8 in)
1972
113.8 mm (4.5 in)
1973
80.2 mm (3.2 in)
1974
96.4 mm (3.8 in)
1975
134.1 mm (5.3 in)
1976
93.7 mm (3.7 in)
1977
182.9 mm (7.2 in)
1978
135.9 mm (5.4 in)
1979
103.6 mm (4.1 in)
1981
208.3 mm (8.2 in)
1982
81.8 mm (3.2 in)
1983
49.2 mm (1.9 in)
1984
96.8 mm (3.8 in)
1985
115.9 mm (4.6 in)
1986
98.6 mm (3.9 in)
1987
7.6 mm (0.30 in)
1988
106.4 mm (4.2 in)
1989
105.0 mm (4.1 in)
1990
95.3 mm (3.8 in)
1991
86.3 mm (3.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Corydon 8 W, 1950 to 1991. The record is 42 days in 1985, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Corydon 8 W by year
Year
Longest dry spell (CDD)
1950
31 days
1951
16 days
1952
18 days
1953
27 days
1954
32 days
1955
28 days
1956
29 days
1957
36 days
1958
36 days
1959
27 days
1960
26 days
1961
16 days
1962
19 days
1963
18 days
1964
26 days
1965
20 days
1966
28 days
1967
33 days
1968
16 days
1969
35 days
1970
20 days
1971
25 days
1972
16 days
1973
16 days
1974
25 days
1975
32 days
1976
40 days
1977
15 days
1978
26 days
1979
19 days
1981
31 days
1982
12 days
1983
11 days
1984
29 days
1985
42 days
1986
34 days
1987
21 days
1988
26 days
1989
35 days
1990
13 days
1991
32 days
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
25 years with a frost
Across 25 years with a frost, the median last spring frost at Corydon 8 W falls on 20 April and the median first autumn frost on 19 October, which leaves a median of 183 days between them.
Fitted over all years, the growing season changes by -2.9 days per decade at this station.
Frost dates and growing season at Corydon 8 W
Measure
Median, all years
Earliest period
Recent period (1953 to 1990)
Recent against earliest
Fitted trend
Last spring frost
20 April
n/a
20 April
n/a
-0.8 days per decade
First autumn frost
19 October
n/a
19 October
n/a
-3.8 days per decade
Growing days
183 days
n/a
183 days
n/a
-2.9 days per decade
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
33 years, 1951 to 1990
A day with at least 65.9 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 166.2 mm (6.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Corydon 8 W: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
65.9 mm (2.6 in)
5 years
85.9 mm (3.4 in)
10 years
101.5 mm (4.0 in)
25 years
124.4 mm (4.9 in)
50 years
144.1 mm (5.7 in)
Longer than the 33 years of record
100 years
166.2 mm (6.5 in)
Longer than the 33 years of record
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 33 years of values from 1951 to 1990.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 181.9 mm (7.2 in) in 1981; 113.0 mm (4.4 in) in 1961; 99.1 mm (3.9 in) in 1985.
Download the Data
Data for Corydon 8 W standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Corydon 8 W threshold days by year: CSV or JSON. Field meanings are on the data page.
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-15 (15 October 2026). Records are computed by this site and are not official.