Record envelope, standing records and threshold days for Leon 6 ESE (USC00134758), Iowa, United States, with 51 years of record.
Key Facts for Leon 6 ESE
Leon 6 ESE (USC00134758) is a weather station in Iowa, United States at 40.72 latitude and -93.65 longitude, 305 m (1,000 ft) above sea level.
The station reports from 1962 to 2012, 51 years of record.
1,464 records set at Leon 6 ESE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Leon 6 ESE set a daily record low minimum temperature of -9.4 C (15.1 F) on 8 October 2012.
About the Station
Location: Iowa, United States, 40.72 latitude, -93.65 longitude.
Elevation: 305 m (1,000 ft).
Period of record: 1962 to 2012, 51 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 Leon 6 ESE. 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 Leon 6 ESE, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.9 C (66.0 F)
-33.3 C (-27.9 F)
n/a
n/a
Feb
23.9 C (75.0 F)
-37.8 C (-36.0 F)
n/a
n/a
Mar
30.6 C (87.1 F)
-29.4 C (-20.9 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-13.9 C (7.0 F)
n/a
n/a
May
34.4 C (93.9 F)
-3.3 C (26.1 F)
n/a
n/a
Jun
41.7 C (107.1 F)
1.7 C (35.1 F)
n/a
n/a
Jul
40.6 C (105.1 F)
6.7 C (44.1 F)
n/a
n/a
Aug
41.7 C (107.1 F)
1.7 C (35.1 F)
n/a
n/a
Sep
37.8 C (100.0 F)
-5.6 C (21.9 F)
n/a
n/a
Oct
35.0 C (95.0 F)
-10.6 C (12.9 F)
n/a
n/a
Nov
26.7 C (80.1 F)
-24.4 C (-11.9 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-36.1 C (-33.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Leon 6 ESE still stand. 1983 holds the most, with 62.
Standing records at Leon 6 ESE by the year they were set
Year set
Standing records
1962
39
1963
40
1964
35
1965
43
1966
30
1967
33
1968
20
1969
10
1970
19
1971
24
1972
34
1973
15
1974
26
1975
24
1976
19
1977
26
1978
24
1979
14
1980
21
1981
26
1982
27
1983
62
1984
35
1985
39
1986
33
1987
25
1988
61
1989
56
1990
30
1991
40
1992
34
1993
18
1994
19
1995
28
1996
36
1997
34
1998
35
1999
26
2000
40
2001
20
2002
32
2003
12
2004
21
2005
26
2006
27
2007
17
2008
16
2009
20
2010
13
2011
24
2012
36
All-Time Record Progression
7 new records
7 all-time records were set at Leon 6 ESE between 2 September 1992 and 31 January 2002. Each dot is a new record.
When Leon 6 ESE set new all-time records
Date
Kind
Detail
1992-09-02
Record daily precipitation
Record daily precipitation 104.4 mm (4.1 in)
1992-09-15
Record daily precipitation
Record daily precipitation 168.7 mm (6.6 in)
1996-02-03
Record low maximum temperature
Record low maximum temperature -25.0 C (-13.0 F)
1996-02-03
Record low minimum temperature
Record low minimum temperature -37.8 C (-36.0 F)
2000-12-21
Record snow depth
Record snow depth 40.6 cm (16.0 in)
2000-12-29
Record snow depth
Record snow depth 45.7 cm (18.0 in)
2002-01-31
Record daily snowfall
Record daily snowfall 27.4 cm (10.8 in)
Wettest Day of Each Month
Sep: 168.7 mm (6.6 in)
The wettest day on record for each calendar month at Leon 6 ESE. The most was 168.7 mm (6.6 in) on 15 September 1992.
Record daily precipitation for each month at Leon 6 ESE
Month
Record daily precipitation (mm)
Date
Jan
29.7 mm (1.2 in)
16 January 1980
Feb
62.2 mm (2.4 in)
21 February 1997
Mar
48.3 mm (1.9 in)
19 March 1982
Apr
74.2 mm (2.9 in)
17 April 1976
May
82.8 mm (3.3 in)
29 May 1962
Jun
97.8 mm (3.9 in)
14 June 1976
Jul
117.1 mm (4.6 in)
5 July 1993
Aug
132.6 mm (5.2 in)
24 August 2007
Sep
168.7 mm (6.6 in)
15 September 1992
Oct
91.4 mm (3.6 in)
31 October 1974
Nov
83.1 mm (3.3 in)
3 November 2003
Dec
38.4 mm (1.5 in)
24 December 1965
Period of Record Coverage
1962 to 2012
Complete yearUnder 90 percent of days
51 years of record at Leon 6 ESE, 1962 to 2012. 4 years have data for under 90 percent of days and are left out of rankings: 1977, 1980, 2003, 2012.
Cooler than the station meanWarmer than the station mean
One stripe for each of 45 complete years at Leon 6 ESE, 1962 to 2011. Blue stripes are years cooler than the station's own mean of 10.0 C (50.0 F); red stripes are warmer. The coolest year was 1996, at 7.8 C (46.1 F), and the warmest was 1987, at 11.8 C (53.2 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Leon 6 ESE as warming stripes, 1962 to 2011
Year
Annual mean temperature
Difference from the station mean
1962
10.0 C
-0.06 C
1963
9.9 C
-0.08 C
1964
11.0 C
+0.96 C
1965
10.0 C
-0.02 C
1966
10.1 C
+0.09 C
1967
10.2 C
+0.19 C
1968
10.4 C
+0.34 C
1969
10.0 C
-0.03 C
1971
10.8 C
+0.78 C
1972
10.0 C
-0.03 C
1973
11.0 C
+1.02 C
1974
10.9 C
+0.86 C
1975
10.8 C
+0.81 C
1976
10.5 C
+0.51 C
1978
9.5 C
-0.55 C
1979
9.5 C
-0.51 C
1981
11.2 C
+1.13 C
1982
9.5 C
-0.57 C
1983
10.7 C
+0.71 C
1984
10.6 C
+0.60 C
1985
9.3 C
-0.71 C
1986
11.1 C
+1.07 C
1987
11.8 C
+1.73 C
1988
10.4 C
+0.40 C
1989
8.4 C
-1.58 C
1990
10.2 C
+0.13 C
1991
9.9 C
-0.10 C
1992
9.4 C
-0.58 C
1993
8.4 C
-1.61 C
1994
9.1 C
-0.93 C
1995
8.9 C
-1.14 C
1996
7.8 C
-2.19 C
1997
8.8 C
-1.21 C
1998
11.0 C
+0.97 C
1999
10.1 C
+0.11 C
2000
9.8 C
-0.27 C
2001
9.8 C
-0.23 C
2002
9.9 C
-0.13 C
2004
10.2 C
+0.20 C
2005
10.4 C
+0.35 C
2006
10.9 C
+0.86 C
2007
10.2 C
+0.19 C
2009
9.0 C
-1.02 C
2010
9.5 C
-0.50 C
2011
9.9 C
-0.16 C
The fitted trend in annual mean temperature here over 1962 to 2011 is -0.16 C (-0.33 to 0.01) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.29 F (-0.59 to 0.01) per decade. The slope is a straight line fitted to 45 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Leon 6 ESE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.16 C (-0.33 to 0.01) per decade
-0.29 F (-0.59 to 0.01) per decade
1962 to 2011
45
Not clearly different from zero
Mean daily maximum
0.00 C (-0.19 to 0.19) per decade
-0.01 F (-0.35 to 0.34) per decade
1962 to 2011
45
Not clearly different from zero
Mean daily minimum
-0.3 C (-0.5 to -0.1) per decade
-0.6 F (-0.9 to -0.2) per decade
1962 to 2011
45
Fall
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
1962 to 2012
Yearly extremes at Leon 6 ESE: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.7 C (107.1 F)
1983
36.1 C (97.0 F)
51
Coldest night (TNn)
-37.8 C (-36.0 F)
1996
-26.7 C (-16.1 F)
51
Wettest day (Rx1day)
168.7 mm (6.6 in)
1992
68.8 mm (2.7 in)
51
Wettest five days (Rx5day)
217.5 mm (8.6 in)
1993
104.2 mm (4.1 in)
51
Longest dry spell (CDD)
46 days
1979
24 days
51
Hottest day (TXx)
The hottest day of the year at Leon 6 ESE, 1962 to 2012. The record is 41.7 C (107.1 F) in 1983, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Leon 6 ESE by year
Year
Hottest day (TXx)
1962
36.7 C (98.1 F)
1963
37.2 C (99.0 F)
1964
36.7 C (98.1 F)
1965
35.0 C (95.0 F)
1966
36.7 C (98.1 F)
1967
35.6 C (96.1 F)
1968
36.1 C (97.0 F)
1969
33.9 C (93.0 F)
1970
38.3 C (100.9 F)
1971
35.6 C (96.1 F)
1972
35.6 C (96.1 F)
1973
33.9 C (93.0 F)
1974
40.0 C (104.0 F)
1975
36.7 C (98.1 F)
1976
36.1 C (97.0 F)
1977
38.3 C (100.9 F)
1978
35.6 C (96.1 F)
1979
37.8 C (100.0 F)
1980
39.4 C (102.9 F)
1981
36.1 C (97.0 F)
1982
36.7 C (98.1 F)
1983
41.7 C (107.1 F)
1984
41.7 C (107.1 F)
1985
36.7 C (98.1 F)
1986
35.6 C (96.1 F)
1987
38.3 C (100.9 F)
1988
41.7 C (107.1 F)
1989
37.2 C (99.0 F)
1990
35.6 C (96.1 F)
1991
36.7 C (98.1 F)
1992
32.8 C (91.0 F)
1993
33.9 C (93.0 F)
1994
35.0 C (95.0 F)
1995
36.1 C (97.0 F)
1996
33.3 C (91.9 F)
1997
37.8 C (100.0 F)
1998
35.6 C (96.1 F)
1999
37.8 C (100.0 F)
2000
36.1 C (97.0 F)
2001
34.4 C (93.9 F)
2002
36.1 C (97.0 F)
2003
38.9 C (102.0 F)
2004
33.9 C (93.0 F)
2005
37.8 C (100.0 F)
2006
37.8 C (100.0 F)
2007
35.6 C (96.1 F)
2008
34.4 C (93.9 F)
2009
33.9 C (93.0 F)
2010
33.3 C (91.9 F)
2011
38.3 C (100.9 F)
2012
39.4 C (102.9 F)
Coldest night (TNn)
The coldest night of the year at Leon 6 ESE, 1962 to 2012. The record is -37.8 C (-36.0 F) in 1996, marked on the chart; the median year is -26.7 C (-16.1 F).
Coldest night (TNn) at Leon 6 ESE by year
Year
Coldest night (TNn)
1962
-28.9 C (-20.0 F)
1963
-28.9 C (-20.0 F)
1964
-23.9 C (-11.0 F)
1965
-27.8 C (-18.0 F)
1966
-29.4 C (-20.9 F)
1967
-23.3 C (-9.9 F)
1968
-27.8 C (-18.0 F)
1969
-25.6 C (-14.1 F)
1970
-25.0 C (-13.0 F)
1971
-26.7 C (-16.1 F)
1972
-26.7 C (-16.1 F)
1973
-24.4 C (-11.9 F)
1974
-30.0 C (-22.0 F)
1975
-26.1 C (-15.0 F)
1976
-26.7 C (-16.1 F)
1977
-29.4 C (-20.9 F)
1978
-24.4 C (-11.9 F)
1979
-26.7 C (-16.1 F)
1980
-23.3 C (-9.9 F)
1981
-29.4 C (-20.9 F)
1982
-30.0 C (-22.0 F)
1983
-30.6 C (-23.1 F)
1984
-28.3 C (-18.9 F)
1985
-30.0 C (-22.0 F)
1986
-24.4 C (-11.9 F)
1987
-22.8 C (-9.0 F)
1988
-32.8 C (-27.0 F)
1989
-36.1 C (-33.0 F)
1990
-23.3 C (-9.9 F)
1991
-25.6 C (-14.1 F)
1992
-20.6 C (-5.1 F)
1993
-22.2 C (-8.0 F)
1994
-26.1 C (-15.0 F)
1995
-27.2 C (-17.0 F)
1996
-37.8 C (-36.0 F)
1997
-30.6 C (-23.1 F)
1998
-29.4 C (-20.9 F)
1999
-33.3 C (-27.9 F)
2000
-27.2 C (-17.0 F)
2001
-30.0 C (-22.0 F)
2002
-20.0 C (-4.0 F)
2003
-15.6 C (3.9 F)
2004
-24.4 C (-11.9 F)
2005
-22.8 C (-9.0 F)
2006
-20.6 C (-5.1 F)
2007
-24.4 C (-11.9 F)
2008
-24.4 C (-11.9 F)
2009
-26.1 C (-15.0 F)
2010
-28.9 C (-20.0 F)
2011
-27.8 C (-18.0 F)
2012
-18.3 C (-0.9 F)
Wettest day (Rx1day)
The wettest day of the year at Leon 6 ESE, 1962 to 2012. The record is 168.7 mm (6.6 in) in 1992, marked on the chart; the median year is 68.8 mm (2.7 in).
Wettest day (Rx1day) at Leon 6 ESE by year
Year
Wettest day (Rx1day)
1962
82.8 mm (3.3 in)
1963
43.2 mm (1.7 in)
1964
90.4 mm (3.6 in)
1965
69.3 mm (2.7 in)
1966
32.8 mm (1.3 in)
1967
71.1 mm (2.8 in)
1968
68.8 mm (2.7 in)
1969
58.2 mm (2.3 in)
1970
96.5 mm (3.8 in)
1971
49.0 mm (1.9 in)
1972
68.6 mm (2.7 in)
1973
67.1 mm (2.6 in)
1974
91.4 mm (3.6 in)
1975
51.1 mm (2.0 in)
1976
97.8 mm (3.9 in)
1977
46.2 mm (1.8 in)
1978
87.6 mm (3.4 in)
1979
52.1 mm (2.1 in)
1980
99.1 mm (3.9 in)
1981
53.8 mm (2.1 in)
1982
69.6 mm (2.7 in)
1983
31.8 mm (1.3 in)
1984
43.7 mm (1.7 in)
1985
57.2 mm (2.3 in)
1986
70.6 mm (2.8 in)
1987
59.9 mm (2.4 in)
1988
29.5 mm (1.2 in)
1989
76.2 mm (3.0 in)
1990
101.9 mm (4.0 in)
1991
59.7 mm (2.4 in)
1992
168.7 mm (6.6 in)
1993
117.1 mm (4.6 in)
1994
74.7 mm (2.9 in)
1995
63.2 mm (2.5 in)
1996
54.1 mm (2.1 in)
1997
68.6 mm (2.7 in)
1998
62.0 mm (2.4 in)
1999
62.7 mm (2.5 in)
2000
50.0 mm (2.0 in)
2001
51.3 mm (2.0 in)
2002
77.2 mm (3.0 in)
2003
83.1 mm (3.3 in)
2004
77.2 mm (3.0 in)
2005
38.4 mm (1.5 in)
2006
35.6 mm (1.4 in)
2007
132.6 mm (5.2 in)
2008
80.8 mm (3.2 in)
2009
103.4 mm (4.1 in)
2010
69.3 mm (2.7 in)
2011
113.0 mm (4.4 in)
2012
69.1 mm (2.7 in)
Wettest five days (Rx5day)
The wettest five days of the year at Leon 6 ESE, 1962 to 2012. The record is 217.5 mm (8.6 in) in 1993, marked on the chart; the median year is 104.2 mm (4.1 in).
Wettest five days (Rx5day) at Leon 6 ESE by year
Year
Wettest five days (Rx5day)
1962
169.4 mm (6.7 in)
1963
51.3 mm (2.0 in)
1964
130.3 mm (5.1 in)
1965
127.5 mm (5.0 in)
1966
76.4 mm (3.0 in)
1967
127.4 mm (5.0 in)
1968
87.9 mm (3.5 in)
1969
76.0 mm (3.0 in)
1970
146.0 mm (5.7 in)
1971
102.9 mm (4.1 in)
1972
143.8 mm (5.7 in)
1973
110.1 mm (4.3 in)
1974
118.8 mm (4.7 in)
1975
83.3 mm (3.3 in)
1976
136.8 mm (5.4 in)
1977
90.6 mm (3.6 in)
1978
173.5 mm (6.8 in)
1979
92.7 mm (3.6 in)
1980
120.1 mm (4.7 in)
1981
115.4 mm (4.5 in)
1982
88.8 mm (3.5 in)
1983
63.8 mm (2.5 in)
1984
85.6 mm (3.4 in)
1985
106.4 mm (4.2 in)
1986
121.7 mm (4.8 in)
1987
147.5 mm (5.8 in)
1988
63.3 mm (2.5 in)
1989
112.1 mm (4.4 in)
1990
111.3 mm (4.4 in)
1991
94.7 mm (3.7 in)
1992
214.9 mm (8.5 in)
1993
217.5 mm (8.6 in)
1994
85.7 mm (3.4 in)
1995
103.1 mm (4.1 in)
1996
116.6 mm (4.6 in)
1997
91.5 mm (3.6 in)
1998
97.8 mm (3.9 in)
1999
76.2 mm (3.0 in)
2000
94.8 mm (3.7 in)
2001
89.6 mm (3.5 in)
2002
94.9 mm (3.7 in)
2003
101.4 mm (4.0 in)
2004
156.0 mm (6.1 in)
2005
66.6 mm (2.6 in)
2006
61.4 mm (2.4 in)
2007
171.0 mm (6.7 in)
2008
133.7 mm (5.3 in)
2009
104.2 mm (4.1 in)
2010
124.2 mm (4.9 in)
2011
114.8 mm (4.5 in)
2012
77.0 mm (3.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Leon 6 ESE, 1962 to 2012. The record is 46 days in 1979, marked on the chart; the median year is 24 days.
Longest dry spell (CDD) at Leon 6 ESE by year
Year
Longest dry spell (CDD)
1962
20 days
1963
28 days
1964
22 days
1965
21 days
1966
25 days
1967
28 days
1968
35 days
1969
35 days
1970
22 days
1971
32 days
1972
19 days
1973
15 days
1974
24 days
1975
25 days
1976
27 days
1977
23 days
1978
29 days
1979
46 days
1980
27 days
1981
31 days
1982
13 days
1983
41 days
1984
16 days
1985
21 days
1986
24 days
1987
23 days
1988
40 days
1989
35 days
1990
13 days
1991
23 days
1992
24 days
1993
24 days
1994
33 days
1995
29 days
1996
26 days
1997
17 days
1998
23 days
1999
37 days
2000
24 days
2001
13 days
2002
32 days
2003
17 days
2004
25 days
2005
24 days
2006
20 days
2007
26 days
2008
16 days
2009
28 days
2010
26 days
2011
23 days
2012
19 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
45 years with a frost
Across 45 years with a frost, the median last spring frost at Leon 6 ESE falls on 28 April and the median first autumn frost on 3 October, which leaves a median of 156 days between them.
Fitted over all years, the growing season changes by -4.5 days per decade at this station.
Frost dates and growing season at Leon 6 ESE
Measure
Median, all years
Earliest period
Recent period (1979 to 2011)
Recent against earliest
Fitted trend
Last spring frost
28 April
n/a
3 May
n/a
+2.7 days per decade
First autumn frost
3 October
n/a
2 October
n/a
-1.8 days per decade
Growing days
156 days
n/a
151 days
n/a
-4.5 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
47 years, 1962 to 2011
A day with at least 66.0 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 158.3 mm (6.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Leon 6 ESE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
66.0 mm (2.6 in)
5 years
90.1 mm (3.5 in)
10 years
106.3 mm (4.2 in)
25 years
127.0 mm (5.0 in)
50 years
142.6 mm (5.6 in)
Longer than the 47 years of record
100 years
158.3 mm (6.2 in)
Longer than the 47 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, 47 years of values from 1962 to 2011.
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: 168.7 mm (6.6 in) in 1992; 132.6 mm (5.2 in) in 2007; 117.1 mm (4.6 in) in 1993.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Leon 6 ESE, at 1981 and 2004. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1981 ran 0.3 C (0.6 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 2004 ran 0.3 C (0.6 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Leon 6 ESE, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1981
-0.3
-0.6
likely
5
2004
+0.3
+0.6
likely
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Leon 6 ESE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Leon 6 ESE 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.