Record envelope, standing records and threshold days for Piper City (USC00116819), Illinois, United States, with 73 years of record.
Key Facts for Piper City
Piper City (USC00116819) is a weather station in Illinois, United States at 40.76 latitude and -88.18 longitude, 204 m (670 ft) above sea level.
The station reports from 1940 to 2012, 73 years of record.
1,464 records set at Piper City still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Piper City tied a daily record high minimum temperature of 0.0 C (32.0 F) on 20 December 2012.
About the Station
Location: Illinois, United States, 40.76 latitude, -88.18 longitude.
Elevation: 204 m (670 ft).
Period of record: 1940 to 2012, 73 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 Piper City. 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 Piper City, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
19.4 C (66.9 F)
-31.7 C (-25.1 F)
n/a
n/a
Feb
23.3 C (73.9 F)
-28.9 C (-20.0 F)
n/a
n/a
Mar
31.7 C (89.1 F)
-20.0 C (-4.0 F)
n/a
n/a
Apr
33.9 C (93.0 F)
-13.9 C (7.0 F)
n/a
n/a
May
37.2 C (99.0 F)
-3.9 C (25.0 F)
n/a
n/a
Jun
41.1 C (106.0 F)
2.8 C (37.0 F)
n/a
n/a
Jul
41.7 C (107.1 F)
5.6 C (42.1 F)
n/a
n/a
Aug
42.2 C (108.0 F)
2.8 C (37.0 F)
n/a
n/a
Sep
38.3 C (100.9 F)
-3.3 C (26.1 F)
n/a
n/a
Oct
33.9 C (93.0 F)
-8.3 C (17.1 F)
n/a
n/a
Nov
26.7 C (80.1 F)
-17.8 C (0.0 F)
n/a
n/a
Dec
23.3 C (73.9 F)
-30.6 C (-23.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Piper City still stand. 1991 holds the most, with 55.
Standing records at Piper City by the year they were set
Year set
Standing records
1968
1
1969
32
1970
35
1971
43
1972
39
1973
30
1974
30
1975
27
1976
33
1977
47
1978
30
1979
48
1980
34
1981
26
1982
44
1983
46
1984
47
1985
21
1986
31
1987
26
1988
52
1989
49
1990
41
1991
55
1992
31
1993
26
1994
26
1995
16
1996
38
1997
32
1998
29
1999
29
2000
35
2001
30
2002
36
2003
21
2004
26
2005
27
2006
26
2007
26
2008
19
2009
23
2010
19
2011
27
2012
55
All-Time Record Progression
1 new records
1 all-time records were set at Piper City between 15 December 2007 and 15 December 2007. Each dot is a new record.
When Piper City set new all-time records
Date
Kind
Detail
2007-12-15
Record daily snowfall
Record daily snowfall 25.7 cm (10.1 in)
Wettest Day of Each Month
Jul: 147.6 mm (5.8 in)
The wettest day on record for each calendar month at Piper City. The most was 147.6 mm (5.8 in) on 8 July 1951.
Record daily precipitation for each month at Piper City
Month
Record daily precipitation (mm)
Date
Jan
105.2 mm (4.1 in)
8 January 2008
Feb
64.8 mm (2.6 in)
14 February 1990
Mar
75.7 mm (3.0 in)
23 March 2007
Apr
71.9 mm (2.8 in)
17 April 2006
May
112.5 mm (4.4 in)
13 May 1970
Jun
79.5 mm (3.1 in)
3 June 1980
Jul
147.6 mm (5.8 in)
8 July 1951
Aug
114.3 mm (4.5 in)
31 August 1989
Sep
77.2 mm (3.0 in)
14 September 1972
Oct
61.7 mm (2.4 in)
16 October 1993
Nov
52.1 mm (2.1 in)
18 November 2003
Dec
78.5 mm (3.1 in)
21 December 1949
Period of Record Coverage
1968 to 2012
Complete yearUnder 90 percent of days
45 years of record at Piper City, 1968 to 2012. 1 years have data for under 90 percent of days and are left out of rankings: 1968.
Cooler than the station meanWarmer than the station mean
One stripe for each of 42 complete years at Piper City, 1969 to 2012. 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 1996, at 9.2 C (48.6 F), and the warmest was 2012, at 12.8 C (55.1 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Piper City as warming stripes, 1969 to 2012
Year
Annual mean temperature
Difference from the station mean
1969
9.9 C
-0.53 C
1970
10.2 C
-0.17 C
1971
11.0 C
+0.58 C
1972
9.8 C
-0.64 C
1973
11.4 C
+1.03 C
1974
10.6 C
+0.18 C
1975
10.8 C
+0.38 C
1976
9.8 C
-0.64 C
1977
10.3 C
-0.10 C
1978
9.6 C
-0.82 C
1979
9.4 C
-1.00 C
1980
10.3 C
-0.15 C
1981
10.4 C
+0.02 C
1982
9.8 C
-0.64 C
1984
10.4 C
+0.01 C
1985
9.5 C
-0.91 C
1986
10.7 C
+0.29 C
1987
11.3 C
+0.93 C
1988
10.5 C
+0.05 C
1989
9.2 C
-1.18 C
1990
11.2 C
+0.80 C
1991
11.3 C
+0.87 C
1992
10.0 C
-0.43 C
1993
9.8 C
-0.64 C
1994
10.5 C
+0.05 C
1995
10.5 C
+0.06 C
1996
9.2 C
-1.20 C
1997
9.5 C
-0.89 C
1998
12.2 C
+1.80 C
1999
10.8 C
+0.42 C
2000
10.1 C
-0.36 C
2001
10.9 C
+0.44 C
2002
10.6 C
+0.16 C
2003
9.7 C
-0.73 C
2004
10.4 C
+0.02 C
2005
11.0 C
+0.58 C
2006
11.3 C
+0.89 C
2007
10.8 C
+0.34 C
2008
9.7 C
-0.75 C
2009
9.6 C
-0.82 C
2010
10.8 C
+0.42 C
2012
12.8 C
+2.40 C
The fitted trend in annual mean temperature here over 1969 to 2012 is 0.1 C (-0.1 to 0.3) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.2 F (-0.1 to 0.6) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Piper City
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (-0.1 to 0.3) per decade
0.2 F (-0.1 to 0.6) per decade
1969 to 2012
42
Not clearly different from zero
Mean daily maximum
0.26 C (0.03 to 0.50) per decade
0.47 F (0.05 to 0.89) per decade
1969 to 2012
42
Rise
Mean daily minimum
0.00 C (-0.19 to 0.19) per decade
0.00 F (-0.35 to 0.35) per decade
1969 to 2012
42
Not clearly different from zero
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
1940 to 2012
Yearly extremes at Piper City: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.2 C (108.0 F)
1988
36.1 C (97.0 F)
45
Coldest night (TNn)
-31.7 C (-25.1 F)
1985
-23.3 C (-9.9 F)
45
Wettest day (Rx1day)
147.6 mm (5.8 in)
1951
59.4 mm (2.3 in)
57
Wettest five days (Rx5day)
200.3 mm (7.9 in)
1970
93.5 mm (3.7 in)
57
Longest dry spell (CDD)
36 days
1999
19 days
57
Hottest day (TXx)
The hottest day of the year at Piper City, 1940 to 2012. The record is 42.2 C (108.0 F) in 1988, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Piper City by year
Year
Hottest day (TXx)
1940
n/a
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1968
12.8 C (55.0 F)
1969
35.0 C (95.0 F)
1970
37.8 C (100.0 F)
1971
36.7 C (98.1 F)
1972
36.7 C (98.1 F)
1973
35.0 C (95.0 F)
1974
37.8 C (100.0 F)
1975
35.6 C (96.1 F)
1976
35.6 C (96.1 F)
1977
37.2 C (99.0 F)
1978
35.0 C (95.0 F)
1979
35.0 C (95.0 F)
1980
38.9 C (102.0 F)
1981
35.0 C (95.0 F)
1982
33.9 C (93.0 F)
1983
38.3 C (100.9 F)
1984
36.7 C (98.1 F)
1985
35.6 C (96.1 F)
1986
35.6 C (96.1 F)
1987
39.4 C (102.9 F)
1988
42.2 C (108.0 F)
1989
37.8 C (100.0 F)
1990
37.2 C (99.0 F)
1991
39.4 C (102.9 F)
1992
34.4 C (93.9 F)
1993
33.9 C (93.0 F)
1994
36.1 C (97.0 F)
1995
40.0 C (104.0 F)
1996
36.1 C (97.0 F)
1997
36.7 C (98.1 F)
1998
36.1 C (97.0 F)
1999
38.3 C (100.9 F)
2000
36.1 C (97.0 F)
2001
35.0 C (95.0 F)
2002
36.7 C (98.1 F)
2003
36.7 C (98.1 F)
2004
33.9 C (93.0 F)
2005
37.2 C (99.0 F)
2006
35.0 C (95.0 F)
2007
34.4 C (93.9 F)
2008
33.3 C (91.9 F)
2009
33.9 C (93.0 F)
2010
37.2 C (99.0 F)
2011
39.4 C (102.9 F)
2012
41.7 C (107.1 F)
Coldest night (TNn)
The coldest night of the year at Piper City, 1940 to 2012. The record is -31.7 C (-25.1 F) in 1985, marked on the chart; the median year is -23.3 C (-9.9 F).
Coldest night (TNn) at Piper City by year
Year
Coldest night (TNn)
1940
n/a
1941
n/a
1942
n/a
1943
n/a
1944
n/a
1945
n/a
1946
n/a
1947
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1968
-21.7 C (-7.1 F)
1969
-22.2 C (-8.0 F)
1970
-26.1 C (-15.0 F)
1971
-22.2 C (-8.0 F)
1972
-26.7 C (-16.1 F)
1973
-23.9 C (-11.0 F)
1974
-27.2 C (-17.0 F)
1975
-25.6 C (-14.1 F)
1976
-26.1 C (-15.0 F)
1977
-29.4 C (-20.9 F)
1978
-22.8 C (-9.0 F)
1979
-28.9 C (-20.0 F)
1980
-23.3 C (-9.9 F)
1981
-24.4 C (-11.9 F)
1982
-31.1 C (-24.0 F)
1983
-30.6 C (-23.1 F)
1984
-27.8 C (-18.0 F)
1985
-31.7 C (-25.1 F)
1986
-20.6 C (-5.1 F)
1987
-25.0 C (-13.0 F)
1988
-23.3 C (-9.9 F)
1989
-28.9 C (-20.0 F)
1990
-22.2 C (-8.0 F)
1991
-18.9 C (-2.0 F)
1992
-21.1 C (-6.0 F)
1993
-21.7 C (-7.1 F)
1994
-28.3 C (-18.9 F)
1995
-20.6 C (-5.1 F)
1996
-28.9 C (-20.0 F)
1997
-23.3 C (-9.9 F)
1998
-18.9 C (-2.0 F)
1999
-29.4 C (-20.9 F)
2000
-23.3 C (-9.9 F)
2001
-18.9 C (-2.0 F)
2002
-20.0 C (-4.0 F)
2003
-22.8 C (-9.0 F)
2004
-23.9 C (-11.0 F)
2005
-21.1 C (-6.0 F)
2006
-20.0 C (-4.0 F)
2007
-22.8 C (-9.0 F)
2008
-23.9 C (-11.0 F)
2009
-28.3 C (-18.9 F)
2010
-22.2 C (-8.0 F)
2011
-25.0 C (-13.0 F)
2012
-19.4 C (-2.9 F)
Wettest day (Rx1day)
The wettest day of the year at Piper City, 1940 to 2012. The record is 147.6 mm (5.8 in) in 1951, marked on the chart; the median year is 59.4 mm (2.3 in).
Wettest day (Rx1day) at Piper City by year
Year
Wettest day (Rx1day)
1940
22.1 mm (0.9 in)
1941
52.8 mm (2.1 in)
1942
54.6 mm (2.1 in)
1943
32.0 mm (1.3 in)
1944
50.8 mm (2.0 in)
1945
43.2 mm (1.7 in)
1946
80.8 mm (3.2 in)
1947
38.4 mm (1.5 in)
1948
72.4 mm (2.9 in)
1949
78.5 mm (3.1 in)
1950
69.9 mm (2.8 in)
1951
147.6 mm (5.8 in)
1968
16.5 mm (0.6 in)
1969
50.5 mm (2.0 in)
1970
112.5 mm (4.4 in)
1971
48.8 mm (1.9 in)
1972
77.2 mm (3.0 in)
1973
47.8 mm (1.9 in)
1974
71.9 mm (2.8 in)
1975
53.6 mm (2.1 in)
1976
59.2 mm (2.3 in)
1977
63.2 mm (2.5 in)
1978
76.5 mm (3.0 in)
1979
58.4 mm (2.3 in)
1980
79.5 mm (3.1 in)
1981
51.6 mm (2.0 in)
1982
67.8 mm (2.7 in)
1983
54.9 mm (2.2 in)
1984
52.1 mm (2.1 in)
1985
53.6 mm (2.1 in)
1986
96.8 mm (3.8 in)
1987
90.2 mm (3.6 in)
1988
52.1 mm (2.1 in)
1989
114.3 mm (4.5 in)
1990
64.8 mm (2.6 in)
1991
41.9 mm (1.6 in)
1992
52.3 mm (2.1 in)
1993
61.7 mm (2.4 in)
1994
45.0 mm (1.8 in)
1995
85.9 mm (3.4 in)
1996
39.9 mm (1.6 in)
1997
104.4 mm (4.1 in)
1998
90.9 mm (3.6 in)
1999
43.7 mm (1.7 in)
2000
65.0 mm (2.6 in)
2001
56.9 mm (2.2 in)
2002
71.9 mm (2.8 in)
2003
68.1 mm (2.7 in)
2004
59.4 mm (2.3 in)
2005
71.6 mm (2.8 in)
2006
71.9 mm (2.8 in)
2007
92.2 mm (3.6 in)
2008
105.2 mm (4.1 in)
2009
61.5 mm (2.4 in)
2010
35.8 mm (1.4 in)
2011
42.4 mm (1.7 in)
2012
52.8 mm (2.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Piper City, 1940 to 2012. The record is 200.3 mm (7.9 in) in 1970, marked on the chart; the median year is 93.5 mm (3.7 in).
Wettest five days (Rx5day) at Piper City by year
Year
Wettest five days (Rx5day)
1940
28.7 mm (1.1 in)
1941
105.9 mm (4.2 in)
1942
87.9 mm (3.5 in)
1943
101.5 mm (4.0 in)
1944
102.9 mm (4.1 in)
1945
69.2 mm (2.7 in)
1946
106.2 mm (4.2 in)
1947
67.1 mm (2.6 in)
1948
74.5 mm (2.9 in)
1949
121.6 mm (4.8 in)
1950
92.1 mm (3.6 in)
1951
173.5 mm (6.8 in)
1968
31.8 mm (1.3 in)
1969
130.3 mm (5.1 in)
1970
200.3 mm (7.9 in)
1971
77.5 mm (3.1 in)
1972
90.9 mm (3.6 in)
1973
80.3 mm (3.2 in)
1974
85.6 mm (3.4 in)
1975
95.8 mm (3.8 in)
1976
78.0 mm (3.1 in)
1977
166.6 mm (6.6 in)
1978
82.3 mm (3.2 in)
1979
83.8 mm (3.3 in)
1980
146.8 mm (5.8 in)
1981
76.2 mm (3.0 in)
1982
95.9 mm (3.8 in)
1983
76.2 mm (3.0 in)
1984
89.1 mm (3.5 in)
1985
107.7 mm (4.2 in)
1986
152.6 mm (6.0 in)
1987
142.3 mm (5.6 in)
1988
68.8 mm (2.7 in)
1989
120.2 mm (4.7 in)
1990
80.8 mm (3.2 in)
1991
83.8 mm (3.3 in)
1992
67.6 mm (2.7 in)
1993
113.3 mm (4.5 in)
1994
82.5 mm (3.2 in)
1995
163.9 mm (6.5 in)
1996
131.9 mm (5.2 in)
1997
112.1 mm (4.4 in)
1998
113.8 mm (4.5 in)
1999
74.0 mm (2.9 in)
2000
95.2 mm (3.7 in)
2001
84.7 mm (3.3 in)
2002
101.1 mm (4.0 in)
2003
127.6 mm (5.0 in)
2004
74.7 mm (2.9 in)
2005
112.5 mm (4.4 in)
2006
152.4 mm (6.0 in)
2007
184.2 mm (7.3 in)
2008
127.8 mm (5.0 in)
2009
90.5 mm (3.6 in)
2010
93.5 mm (3.7 in)
2011
64.3 mm (2.5 in)
2012
88.9 mm (3.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Piper City, 1940 to 2012. The record is 36 days in 1999, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Piper City by year
Year
Longest dry spell (CDD)
1940
15 days
1941
28 days
1942
28 days
1943
21 days
1944
28 days
1945
19 days
1946
18 days
1947
26 days
1948
19 days
1949
21 days
1950
19 days
1951
13 days
1968
11 days
1969
23 days
1970
17 days
1971
31 days
1972
20 days
1973
19 days
1974
17 days
1975
10 days
1976
26 days
1977
14 days
1978
16 days
1979
29 days
1980
16 days
1981
24 days
1982
18 days
1983
26 days
1984
15 days
1985
16 days
1986
29 days
1987
27 days
1988
30 days
1989
20 days
1990
17 days
1991
24 days
1992
20 days
1993
20 days
1994
29 days
1995
22 days
1996
19 days
1997
16 days
1998
16 days
1999
36 days
2000
16 days
2001
15 days
2002
22 days
2003
14 days
2004
20 days
2005
25 days
2006
16 days
2007
18 days
2008
12 days
2009
14 days
2010
17 days
2011
17 days
2012
21 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
42 years with a frost
Across 42 years with a frost, the median last spring frost at Piper City falls on 26 April and the median first autumn frost on 12 October, which leaves a median of 171 days between them.
Fitted over all years, the growing season changes by +3.4 days per decade at this station.
Frost dates and growing season at Piper City
Measure
Median, all years
Earliest period
Recent period (1981 to 2012)
Recent against earliest
Fitted trend
Last spring frost
26 April
n/a
23 April
n/a
-2.9 days per decade
First autumn frost
12 October
n/a
11 October
n/a
+0.5 days per decade
Growing days
171 days
n/a
172 days
n/a
+3.4 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
44 years, 1941 to 2012
A day with at least 63.6 mm (2.5 in) of rain is expected about once in 2 years. A day with at least 135.8 mm (5.3 in) of rain is expected about once in 100 years.
Rainfall return levels at Piper City: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
63.6 mm (2.5 in)
5 years
81.5 mm (3.2 in)
10 years
94.0 mm (3.7 in)
25 years
110.3 mm (4.3 in)
50 years
122.9 mm (4.8 in)
Longer than the 44 years of record
100 years
135.8 mm (5.3 in)
Longer than the 44 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, 44 years of values from 1941 to 2012.
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: 114.3 mm (4.5 in) in 1989; 112.5 mm (4.4 in) in 1970; 105.2 mm (4.1 in) in 2008.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Piper City standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Piper City 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.