Record envelope, standing records and threshold days for Lacon (USC00114805), Illinois, United States, with 77 years of record.
Key Facts for Lacon
Lacon (USC00114805) is a weather station in Illinois, United States at 41.02 latitude and -89.42 longitude, 140 m (458 ft) above sea level.
The station reports from 1950 to 2026, 77 years of record.
1,464 records set at Lacon still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Lacon set a daily record precipitation of 25.4 mm (1.0 in) on 2 August 2026.
About the Station
Location: Illinois, United States, 41.02 latitude, -89.42 longitude.
Elevation: 140 m (458 ft).
Period of record: 1950 to 2026, 77 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 Lacon. 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 Lacon, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.1 C (70.0 F)
-32.8 C (-27.0 F)
n/a
n/a
Feb
22.8 C (73.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Mar
27.2 C (81.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Apr
33.9 C (93.0 F)
-11.7 C (10.9 F)
n/a
n/a
May
35.0 C (95.0 F)
-5.6 C (21.9 F)
n/a
n/a
Jun
38.9 C (102.0 F)
2.2 C (36.0 F)
n/a
n/a
Jul
39.4 C (102.9 F)
6.7 C (44.1 F)
n/a
n/a
Aug
38.9 C (102.0 F)
3.3 C (37.9 F)
n/a
n/a
Sep
37.2 C (99.0 F)
-2.2 C (28.0 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-8.9 C (16.0 F)
n/a
n/a
Nov
27.8 C (82.0 F)
-19.4 C (-2.9 F)
n/a
n/a
Dec
21.7 C (71.1 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 Lacon still stand. 1988 holds the most, with 59.
Standing records at Lacon by the year they were set
Year set
Standing records
1950
12
1951
15
1952
23
1959
27
1960
37
1961
19
1962
36
1963
16
1964
20
1965
32
1966
27
1967
42
1968
25
1969
23
1970
30
1971
29
1972
34
1973
27
1974
31
1975
32
1976
45
1977
43
1978
23
1979
34
1980
24
1981
10
1982
35
1983
51
1984
37
1985
32
1986
16
1987
11
1988
59
1989
46
1990
28
1991
43
1992
24
1993
15
1994
23
1995
13
1996
26
1997
20
1998
23
1999
13
2000
30
2001
14
2002
31
2003
20
2004
19
2005
22
2006
29
2007
33
2008
17
2009
18
All-Time Record Progression
4 new records
4 all-time records were set at Lacon between 13 March 1991 and 1 December 2006. Each dot is a new record.
When Lacon set new all-time records
Date
Kind
Detail
1991-03-13
Record daily snowfall
Record daily snowfall 27.9 cm (11.0 in)
1999-01-02
Record daily snowfall
Record daily snowfall 30.5 cm (12.0 in)
1999-01-05
Record low minimum temperature
Record low minimum temperature -32.8 C (-27.0 F)
2006-12-01
Record daily snowfall
Record daily snowfall 33.0 cm (13.0 in)
Wettest Day of Each Month
Jul: 138.9 mm (5.5 in)
The wettest day on record for each calendar month at Lacon. The most was 138.9 mm (5.5 in) on 16 July 1977.
Record daily precipitation for each month at Lacon
Month
Record daily precipitation (mm)
Date
Jan
63.5 mm (2.5 in)
29 January 2001
Feb
89.4 mm (3.5 in)
21 February 1997
Mar
79.2 mm (3.1 in)
4 March 1985
Apr
125.7 mm (4.9 in)
18 April 2013
May
59.7 mm (2.4 in)
27 May 1996
Jun
106.2 mm (4.2 in)
20 June 1964
Jul
138.9 mm (5.5 in)
16 July 1977
Aug
82.6 mm (3.3 in)
31 August 1980
Sep
124.0 mm (4.9 in)
6 September 1989
Oct
118.1 mm (4.6 in)
3 October 1986
Nov
70.4 mm (2.8 in)
18 November 1985
Dec
54.1 mm (2.1 in)
5 December 1999
Period of Record Coverage
1950 to 2009
Complete yearUnder 90 percent of days
54 years of record at Lacon, 1950 to 2009. 11 years have data for under 90 percent of days and are left out of rankings: 1950, 1951, 1952, 1959, 1961, 1963, 1964, 1985 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 40 complete years at Lacon, 1960 to 2008. Blue stripes are years cooler than the station's own mean of 11.0 C (51.7 F); red stripes are warmer. The coolest year was 1979, at 9.7 C (49.4 F), and the warmest was 1998, at 12.8 C (55.0 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Lacon as warming stripes, 1960 to 2008
Year
Annual mean temperature
Difference from the station mean
1960
10.4 C
-0.61 C
1962
10.7 C
-0.31 C
1966
10.3 C
-0.71 C
1967
10.2 C
-0.80 C
1968
10.8 C
-0.18 C
1969
10.1 C
-0.87 C
1970
10.2 C
-0.77 C
1972
9.9 C
-1.09 C
1973
11.7 C
+0.71 C
1974
10.9 C
-0.11 C
1975
10.9 C
-0.02 C
1976
10.3 C
-0.62 C
1977
10.9 C
-0.04 C
1978
9.9 C
-1.05 C
1979
9.7 C
-1.29 C
1980
10.8 C
-0.21 C
1981
11.1 C
+0.09 C
1982
10.4 C
-0.61 C
1983
11.6 C
+0.63 C
1984
11.2 C
+0.21 C
1988
11.4 C
+0.47 C
1989
10.0 C
-0.98 C
1990
11.5 C
+0.51 C
1991
12.1 C
+1.11 C
1992
11.2 C
+0.25 C
1993
10.7 C
-0.24 C
1994
11.4 C
+0.40 C
1995
11.0 C
-0.01 C
1996
10.0 C
-1.00 C
1997
10.6 C
-0.37 C
1998
12.8 C
+1.83 C
2000
11.6 C
+0.61 C
2001
11.7 C
+0.73 C
2002
11.8 C
+0.79 C
2003
11.0 C
+0.07 C
2004
11.3 C
+0.38 C
2005
11.9 C
+0.91 C
2006
12.4 C
+1.39 C
2007
12.1 C
+1.11 C
2008
10.5 C
-0.45 C
The annual mean temperature here has risen by 0.3 C (0.2 to 0.5) per decade over 1960 to 2008. In Fahrenheit: 0.6 F (0.3 to 0.8) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Lacon
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.2 to 0.5) per decade
0.6 F (0.3 to 0.8) per decade
1960 to 2008
40
Rise
Mean daily maximum
0.3 C (0.1 to 0.4) per decade
0.5 F (0.2 to 0.8) per decade
1960 to 2008
40
Rise
Mean daily minimum
0.3 C (0.2 to 0.5) per decade
0.6 F (0.3 to 0.9) per decade
1960 to 2008
40
Rise
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 2026
Yearly extremes at Lacon: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
39.4 C (102.9 F)
1977
36.4 C (97.5 F)
54
Coldest night (TNn)
-32.8 C (-27.0 F)
1999
-24.1 C (-11.5 F)
54
Wettest day (Rx1day)
138.9 mm (5.5 in)
1977
59.4 mm (2.3 in)
69
Wettest five days (Rx5day)
186.7 mm (7.4 in)
1968
98.9 mm (3.9 in)
69
Longest dry spell (CDD)
45 days
1969
20 days
69
Hottest day (TXx)
The hottest day of the year at Lacon, 1950 to 2026. The record is 39.4 C (102.9 F) in 1977, marked on the chart; the median year is 36.4 C (97.5 F).
Hottest day (TXx) at Lacon by year
Year
Hottest day (TXx)
1950
27.8 C (82.0 F)
1951
34.4 C (93.9 F)
1952
36.7 C (98.1 F)
1959
36.7 C (98.1 F)
1960
36.7 C (98.1 F)
1961
35.6 C (96.1 F)
1962
36.1 C (97.0 F)
1963
25.6 C (78.1 F)
1964
36.7 C (98.1 F)
1965
37.2 C (99.0 F)
1966
37.2 C (99.0 F)
1967
33.9 C (93.0 F)
1968
36.7 C (98.1 F)
1969
35.0 C (95.0 F)
1970
36.7 C (98.1 F)
1971
36.7 C (98.1 F)
1972
35.6 C (96.1 F)
1973
35.0 C (95.0 F)
1974
36.1 C (97.0 F)
1975
33.9 C (93.0 F)
1976
36.1 C (97.0 F)
1977
39.4 C (102.9 F)
1978
37.2 C (99.0 F)
1979
35.0 C (95.0 F)
1980
37.2 C (99.0 F)
1981
35.0 C (95.0 F)
1982
33.9 C (93.0 F)
1983
39.4 C (102.9 F)
1984
38.9 C (102.0 F)
1985
34.4 C (93.9 F)
1986
33.9 C (93.0 F)
1987
37.8 C (100.0 F)
1988
38.9 C (102.0 F)
1989
37.2 C (99.0 F)
1990
35.0 C (95.0 F)
1991
37.8 C (100.0 F)
1992
35.0 C (95.0 F)
1993
34.4 C (93.9 F)
1994
37.2 C (99.0 F)
1995
38.9 C (102.0 F)
1996
35.6 C (96.1 F)
1997
37.2 C (99.0 F)
1998
35.6 C (96.1 F)
1999
37.2 C (99.0 F)
2000
36.7 C (98.1 F)
2001
36.1 C (97.0 F)
2002
36.7 C (98.1 F)
2003
36.7 C (98.1 F)
2004
34.4 C (93.9 F)
2005
39.4 C (102.9 F)
2006
37.2 C (99.0 F)
2007
35.0 C (95.0 F)
2008
34.4 C (93.9 F)
2009
35.0 C (95.0 F)
2012
n/a
2013
n/a
2014
n/a
2015
n/a
2016
n/a
2017
n/a
2018
n/a
2019
n/a
2020
n/a
2021
n/a
2022
n/a
2023
n/a
2024
n/a
2025
n/a
2026
n/a
Coldest night (TNn)
The coldest night of the year at Lacon, 1950 to 2026. The record is -32.8 C (-27.0 F) in 1999, marked on the chart; the median year is -24.1 C (-11.5 F).
Coldest night (TNn) at Lacon by year
Year
Coldest night (TNn)
1950
-25.0 C (-13.0 F)
1951
-26.1 C (-15.0 F)
1952
-17.8 C (0.0 F)
1959
-17.8 C (0.0 F)
1960
-23.9 C (-11.0 F)
1961
-23.3 C (-9.9 F)
1962
-24.4 C (-11.9 F)
1963
-30.0 C (-22.0 F)
1964
-18.9 C (-2.0 F)
1965
-23.9 C (-11.0 F)
1966
-27.2 C (-17.0 F)
1967
-24.4 C (-11.9 F)
1968
-26.1 C (-15.0 F)
1969
-22.8 C (-9.0 F)
1970
-28.9 C (-20.0 F)
1971
-23.3 C (-9.9 F)
1972
-30.0 C (-22.0 F)
1973
-22.8 C (-9.0 F)
1974
-29.4 C (-20.9 F)
1975
-25.0 C (-13.0 F)
1976
-25.0 C (-13.0 F)
1977
-28.9 C (-20.0 F)
1978
-22.8 C (-9.0 F)
1979
-29.4 C (-20.9 F)
1980
-23.3 C (-9.9 F)
1981
-23.9 C (-11.0 F)
1982
-28.9 C (-20.0 F)
1983
-28.3 C (-18.9 F)
1984
-27.8 C (-18.0 F)
1985
-28.9 C (-20.0 F)
1986
0.6 C (33.1 F)
1987
-16.1 C (3.0 F)
1988
-25.0 C (-13.0 F)
1989
-31.1 C (-24.0 F)
1990
-21.1 C (-6.0 F)
1991
-20.0 C (-4.0 F)
1992
-20.0 C (-4.0 F)
1993
-20.6 C (-5.1 F)
1994
-27.8 C (-18.0 F)
1995
-18.9 C (-2.0 F)
1996
-28.3 C (-18.9 F)
1997
-23.9 C (-11.0 F)
1998
-20.0 C (-4.0 F)
1999
-32.8 C (-27.0 F)
2000
-26.7 C (-16.1 F)
2001
-21.1 C (-6.0 F)
2002
-20.6 C (-5.1 F)
2003
-24.4 C (-11.9 F)
2004
-24.4 C (-11.9 F)
2005
-19.4 C (-2.9 F)
2006
-20.0 C (-4.0 F)
2007
-23.3 C (-9.9 F)
2008
-23.3 C (-9.9 F)
2009
-30.6 C (-23.1 F)
2012
n/a
2013
n/a
2014
n/a
2015
n/a
2016
n/a
2017
n/a
2018
n/a
2019
n/a
2020
n/a
2021
n/a
2022
n/a
2023
n/a
2024
n/a
2025
n/a
2026
n/a
Wettest day (Rx1day)
The wettest day of the year at Lacon, 1950 to 2026. The record is 138.9 mm (5.5 in) in 1977, marked on the chart; the median year is 59.4 mm (2.3 in).
Wettest day (Rx1day) at Lacon by year
Year
Wettest day (Rx1day)
1950
10.2 mm (0.4 in)
1951
106.7 mm (4.2 in)
1952
53.3 mm (2.1 in)
1959
50.8 mm (2.0 in)
1960
53.3 mm (2.1 in)
1961
61.0 mm (2.4 in)
1962
67.3 mm (2.6 in)
1963
23.4 mm (0.9 in)
1964
106.2 mm (4.2 in)
1965
58.4 mm (2.3 in)
1966
46.0 mm (1.8 in)
1967
50.8 mm (2.0 in)
1968
99.8 mm (3.9 in)
1969
69.6 mm (2.7 in)
1970
64.3 mm (2.5 in)
1971
68.1 mm (2.7 in)
1972
72.4 mm (2.9 in)
1973
55.6 mm (2.2 in)
1974
66.5 mm (2.6 in)
1975
57.2 mm (2.3 in)
1976
59.2 mm (2.3 in)
1977
138.9 mm (5.5 in)
1978
48.8 mm (1.9 in)
1979
63.0 mm (2.5 in)
1980
82.6 mm (3.3 in)
1981
61.0 mm (2.4 in)
1982
59.4 mm (2.3 in)
1983
67.3 mm (2.6 in)
1984
47.0 mm (1.9 in)
1985
79.2 mm (3.1 in)
1986
118.1 mm (4.6 in)
1987
50.3 mm (2.0 in)
1988
36.8 mm (1.4 in)
1989
124.0 mm (4.9 in)
1990
91.4 mm (3.6 in)
1991
70.6 mm (2.8 in)
1992
86.9 mm (3.4 in)
1993
47.2 mm (1.9 in)
1994
58.4 mm (2.3 in)
1995
48.5 mm (1.9 in)
1996
77.2 mm (3.0 in)
1997
99.3 mm (3.9 in)
1998
50.3 mm (2.0 in)
1999
82.3 mm (3.2 in)
2000
53.3 mm (2.1 in)
2001
63.5 mm (2.5 in)
2002
55.6 mm (2.2 in)
2003
68.6 mm (2.7 in)
2004
47.8 mm (1.9 in)
2005
36.1 mm (1.4 in)
2006
57.2 mm (2.3 in)
2007
52.6 mm (2.1 in)
2008
54.6 mm (2.1 in)
2009
53.6 mm (2.1 in)
2012
61.2 mm (2.4 in)
2013
125.7 mm (4.9 in)
2014
47.8 mm (1.9 in)
2015
98.0 mm (3.9 in)
2016
58.4 mm (2.3 in)
2017
92.7 mm (3.6 in)
2018
54.6 mm (2.1 in)
2019
79.0 mm (3.1 in)
2020
38.4 mm (1.5 in)
2021
91.4 mm (3.6 in)
2022
44.5 mm (1.8 in)
2023
61.5 mm (2.4 in)
2024
45.7 mm (1.8 in)
2025
60.5 mm (2.4 in)
2026
50.0 mm (2.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Lacon, 1950 to 2026. The record is 186.7 mm (7.4 in) in 1968, marked on the chart; the median year is 98.9 mm (3.9 in).
Wettest five days (Rx5day) at Lacon by year
Year
Wettest five days (Rx5day)
1950
22.4 mm (0.9 in)
1951
126.5 mm (5.0 in)
1952
84.8 mm (3.3 in)
1959
95.5 mm (3.8 in)
1960
67.0 mm (2.6 in)
1961
126.3 mm (5.0 in)
1962
146.5 mm (5.8 in)
1963
48.8 mm (1.9 in)
1964
107.2 mm (4.2 in)
1965
95.2 mm (3.7 in)
1966
80.5 mm (3.2 in)
1967
75.2 mm (3.0 in)
1968
186.7 mm (7.4 in)
1969
130.3 mm (5.1 in)
1970
135.3 mm (5.3 in)
1971
121.5 mm (4.8 in)
1972
97.5 mm (3.8 in)
1973
63.0 mm (2.5 in)
1974
144.3 mm (5.7 in)
1975
64.6 mm (2.5 in)
1976
138.7 mm (5.5 in)
1977
163.8 mm (6.4 in)
1978
86.1 mm (3.4 in)
1979
79.7 mm (3.1 in)
1980
131.9 mm (5.2 in)
1981
111.8 mm (4.4 in)
1982
98.9 mm (3.9 in)
1983
105.3 mm (4.1 in)
1984
100.3 mm (3.9 in)
1985
140.0 mm (5.5 in)
1986
160.7 mm (6.3 in)
1987
85.6 mm (3.4 in)
1988
56.7 mm (2.2 in)
1989
175.4 mm (6.9 in)
1990
98.3 mm (3.9 in)
1991
136.9 mm (5.4 in)
1992
102.4 mm (4.0 in)
1993
90.2 mm (3.6 in)
1994
76.7 mm (3.0 in)
1995
102.1 mm (4.0 in)
1996
107.3 mm (4.2 in)
1997
119.2 mm (4.7 in)
1998
84.6 mm (3.3 in)
1999
87.3 mm (3.4 in)
2000
88.1 mm (3.5 in)
2001
79.3 mm (3.1 in)
2002
84.3 mm (3.3 in)
2003
121.4 mm (4.8 in)
2004
74.5 mm (2.9 in)
2005
80.5 mm (3.2 in)
2006
121.9 mm (4.8 in)
2007
86.6 mm (3.4 in)
2008
119.7 mm (4.7 in)
2009
117.5 mm (4.6 in)
2012
66.0 mm (2.6 in)
2013
147.4 mm (5.8 in)
2014
117.2 mm (4.6 in)
2015
186.0 mm (7.3 in)
2016
126.8 mm (5.0 in)
2017
117.2 mm (4.6 in)
2018
88.4 mm (3.5 in)
2019
99.5 mm (3.9 in)
2020
87.1 mm (3.4 in)
2021
152.9 mm (6.0 in)
2022
55.9 mm (2.2 in)
2023
84.2 mm (3.3 in)
2024
88.9 mm (3.5 in)
2025
82.3 mm (3.2 in)
2026
92.1 mm (3.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Lacon, 1950 to 2026. The record is 45 days in 1969, marked on the chart; the median year is 20 days.
Longest dry spell (CDD) at Lacon by year
Year
Longest dry spell (CDD)
1950
12 days
1951
13 days
1952
21 days
1959
19 days
1960
24 days
1961
33 days
1962
20 days
1963
18 days
1964
35 days
1965
20 days
1966
25 days
1967
24 days
1968
35 days
1969
45 days
1970
17 days
1971
31 days
1972
16 days
1973
17 days
1974
17 days
1975
15 days
1976
25 days
1977
20 days
1978
18 days
1979
34 days
1980
28 days
1981
22 days
1982
18 days
1983
25 days
1984
16 days
1985
12 days
1986
15 days
1987
14 days
1988
21 days
1989
24 days
1990
20 days
1991
23 days
1992
24 days
1993
22 days
1994
20 days
1995
19 days
1996
20 days
1997
21 days
1998
16 days
1999
37 days
2000
18 days
2001
16 days
2002
21 days
2003
20 days
2004
20 days
2005
19 days
2006
19 days
2007
27 days
2008
13 days
2009
13 days
2012
12 days
2013
23 days
2014
19 days
2015
31 days
2016
19 days
2017
21 days
2018
16 days
2019
19 days
2020
15 days
2021
16 days
2022
16 days
2023
25 days
2024
24 days
2025
18 days
2026
25 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
40 years with a frost
Across 40 years with a frost, the median last spring frost at Lacon falls on 25 April and the median first autumn frost on 11 October, which leaves a median of 169 days between them.
Fitted over all years, the growing season changes by +0.5 days per decade at this station.
Frost dates and growing season at Lacon
Measure
Median, all years
Earliest period
Recent period (1975 to 2008)
Recent against earliest
Fitted trend
Last spring frost
25 April
n/a
24 April
n/a
-0.6 days per decade
First autumn frost
11 October
n/a
11 October
n/a
-0.1 days per decade
Growing days
169 days
n/a
170 days
n/a
+0.5 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
57 years, 1960 to 2025
A day with at least 61.3 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 150.0 mm (5.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Lacon: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
61.3 mm (2.4 in)
5 years
79.9 mm (3.1 in)
10 years
94.1 mm (3.7 in)
25 years
114.4 mm (4.5 in)
50 years
131.3 mm (5.2 in)
100 years
150.0 mm (5.9 in)
Longer than the 57 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, 57 years of values from 1960 to 2025.
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: 138.9 mm (5.5 in) in 1977; 125.7 mm (4.9 in) in 2013; 124.0 mm (4.9 in) in 1989.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Lacon standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Lacon 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.