Record envelope, standing records and threshold days for Chicago UNIV (USW00014892), Illinois, United States, with 69 years of record.
Key Facts for Chicago UNIV
Chicago UNIV (USW00014892) is a weather station in Illinois, United States at 41.78 latitude and -87.60 longitude, 181 m (594 ft) above sea level.
The station reports from 1926 to 1994, 69 years of record.
1,464 records set at Chicago UNIV still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Chicago UNIV set a daily record high minimum temperature of 16.7 C (62.1 F) on 18 October 1994.
About the Station
Location: Illinois, United States, 41.78 latitude, -87.60 longitude.
Elevation: 181 m (594 ft).
Period of record: 1926 to 1994, 69 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 Chicago UNIV. 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 Chicago UNIV, 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)
-31.1 C (-24.0 F)
n/a
n/a
Feb
21.7 C (71.1 F)
-28.3 C (-18.9 F)
n/a
n/a
Mar
28.9 C (84.0 F)
-17.8 C (0.0 F)
n/a
n/a
Apr
32.8 C (91.0 F)
-10.6 C (12.9 F)
n/a
n/a
May
36.7 C (98.1 F)
-0.6 C (30.9 F)
n/a
n/a
Jun
40.0 C (104.0 F)
5.0 C (41.0 F)
n/a
n/a
Jul
40.6 C (105.1 F)
10.6 C (51.1 F)
n/a
n/a
Aug
38.3 C (100.9 F)
9.4 C (48.9 F)
n/a
n/a
Sep
37.8 C (100.0 F)
0.6 C (33.1 F)
n/a
n/a
Oct
33.3 C (91.9 F)
-4.4 C (24.1 F)
n/a
n/a
Nov
26.7 C (80.1 F)
-17.8 C (0.0 F)
n/a
n/a
Dec
20.6 C (69.1 F)
-28.9 C (-20.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Chicago UNIV still stand. 1930 holds the most, with 45.
Standing records at Chicago UNIV by the year they were set
Year set
Standing records
1926
24
1927
29
1928
31
1929
36
1930
45
1931
28
1932
28
1933
33
1934
32
1935
20
1936
42
1937
22
1938
16
1939
31
1940
36
1941
19
1942
28
1943
18
1944
18
1948
8
1949
25
1950
32
1951
25
1952
19
1953
24
1954
20
1955
16
1956
18
1957
7
1958
17
1959
14
1960
12
1961
18
1962
29
1963
25
1964
23
1965
26
1966
19
1967
22
1968
16
1969
14
1970
19
1971
19
1972
24
1973
13
1974
19
1975
20
1976
25
1977
21
1978
12
1979
21
1980
16
1981
16
1982
22
1983
30
1984
19
1985
12
1986
17
1987
17
1988
43
1989
23
1990
30
1991
27
1992
14
1993
5
1994
15
All-Time Record Progression
5 new records
5 all-time records were set at Chicago UNIV between 15 July 1980 and 17 August 1988. Each dot is a new record.
When Chicago UNIV set new all-time records
Date
Kind
Detail
1980-07-15
Record high minimum temperature
Record high minimum temperature 27.2 C (81.0 F)
1982-01-10
Record low minimum temperature
Record low minimum temperature -29.4 C (-20.9 F)
1985-01-20
Record low minimum temperature
Record low minimum temperature -31.1 C (-24.0 F)
1988-07-16
Record high minimum temperature
Record high minimum temperature 27.8 C (82.0 F)
1988-08-17
Record high minimum temperature
Record high minimum temperature 28.3 C (82.9 F)
Wettest Day of Each Month
Jul: 130.3 mm (5.1 in)
The wettest day on record for each calendar month at Chicago UNIV. The most was 130.3 mm (5.1 in) on 12 July 1957.
Record daily precipitation for each month at Chicago UNIV
Month
Record daily precipitation (mm)
Date
Jan
73.7 mm (2.9 in)
12 January 1960
Feb
50.3 mm (2.0 in)
6 February 1942
Mar
79.2 mm (3.1 in)
31 March 1929
Apr
86.9 mm (3.4 in)
30 April 1970
May
86.6 mm (3.4 in)
10 May 1951
Jun
92.2 mm (3.6 in)
14 June 1976
Jul
130.3 mm (5.1 in)
12 July 1957
Aug
88.9 mm (3.5 in)
16 August 1968
Sep
68.8 mm (2.7 in)
26 September 1933
Oct
88.1 mm (3.5 in)
10 October 1954
Nov
70.9 mm (2.8 in)
16 November 1988
Dec
81.0 mm (3.2 in)
3 December 1982
Period of Record Coverage
1926 to 1994
Complete yearUnder 90 percent of days
67 years of record at Chicago UNIV, 1926 to 1994. 4 years have data for under 90 percent of days and are left out of rankings: 1943, 1945, 1948, 1994.
Cooler than the station meanWarmer than the station mean
One stripe for each of 59 complete years at Chicago UNIV, 1926 to 1993. Blue stripes are years cooler than the station's own mean of 10.6 C (51.1 F); red stripes are warmer. The coolest year was 1926, at 8.9 C (47.9 F), and the warmest was 1987, at 12.5 C (54.4 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Chicago UNIV as warming stripes, 1926 to 1993
Year
Annual mean temperature
Difference from the station mean
1926
8.9 C
-1.74 C
1927
10.3 C
-0.28 C
1928
9.8 C
-0.80 C
1929
9.2 C
-1.43 C
1930
10.6 C
-0.04 C
1931
12.2 C
+1.58 C
1932
10.3 C
-0.30 C
1933
10.9 C
+0.34 C
1934
10.7 C
+0.09 C
1935
9.7 C
-0.91 C
1936
9.6 C
-0.96 C
1937
9.4 C
-1.21 C
1938
11.2 C
+0.63 C
1939
11.1 C
+0.52 C
1940
9.3 C
-1.31 C
1941
11.1 C
+0.47 C
1944
10.5 C
-0.13 C
1949
11.1 C
+0.46 C
1950
9.2 C
-1.35 C
1951
9.1 C
-1.46 C
1952
10.8 C
+0.17 C
1953
11.5 C
+0.95 C
1954
11.2 C
+0.60 C
1955
10.7 C
+0.11 C
1956
10.7 C
+0.13 C
1957
10.1 C
-0.53 C
1958
9.5 C
-1.07 C
1959
10.4 C
-0.21 C
1960
9.9 C
-0.70 C
1961
10.3 C
-0.34 C
1962
10.0 C
-0.57 C
1964
11.0 C
+0.40 C
1966
10.3 C
-0.32 C
1967
9.7 C
-0.94 C
1968
10.7 C
+0.10 C
1969
9.9 C
-0.69 C
1970
10.4 C
-0.20 C
1971
10.6 C
+0.04 C
1973
12.1 C
+1.50 C
1974
11.1 C
+0.55 C
1975
11.3 C
+0.74 C
1976
10.5 C
-0.08 C
1977
11.1 C
+0.47 C
1978
10.1 C
-0.52 C
1979
9.9 C
-0.71 C
1980
10.6 C
-0.03 C
1981
11.0 C
+0.40 C
1982
10.5 C
-0.09 C
1983
11.4 C
+0.78 C
1984
11.1 C
+0.52 C
1985
10.8 C
+0.18 C
1986
11.6 C
+0.98 C
1987
12.5 C
+1.86 C
1988
11.5 C
+0.90 C
1989
10.4 C
-0.22 C
1990
12.4 C
+1.76 C
1991
12.3 C
+1.71 C
1992
10.6 C
+0.04 C
1993
10.6 C
+0.03 C
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1926 to 1993. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 59 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Chicago UNIV
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.2 C (0.1 to 0.3) per decade
0.3 F (0.1 to 0.5) per decade
1926 to 1993
59
Rise
Mean daily maximum
0.3 C (0.2 to 0.4) per decade
0.5 F (0.3 to 0.7) per decade
1926 to 1993
59
Rise
Mean daily minimum
0.06 C (-0.04 to 0.16) per decade
0.1 F (-0.1 to 0.3) per decade
1926 to 1993
59
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
1926 to 1994
Yearly extremes at Chicago UNIV: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.6 C (105.1 F)
1934
36.1 C (97.0 F)
67
Coldest night (TNn)
-31.1 C (-24.0 F)
1985
-21.7 C (-7.1 F)
67
Wettest day (Rx1day)
130.3 mm (5.1 in)
1957
57.4 mm (2.3 in)
67
Wettest five days (Rx5day)
191.1 mm (7.5 in)
1954
89.1 mm (3.5 in)
67
Longest dry spell (CDD)
33 days
1939
18 days
67
Hottest day (TXx)
The hottest day of the year at Chicago UNIV, 1926 to 1994. The record is 40.6 C (105.1 F) in 1934, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Chicago UNIV by year
Year
Hottest day (TXx)
1926
35.6 C (96.1 F)
1927
35.0 C (95.0 F)
1928
34.4 C (93.9 F)
1929
33.9 C (93.0 F)
1930
38.3 C (100.9 F)
1931
37.2 C (99.0 F)
1932
36.1 C (97.0 F)
1933
37.8 C (100.0 F)
1934
40.6 C (105.1 F)
1935
35.0 C (95.0 F)
1936
38.9 C (102.0 F)
1937
36.1 C (97.0 F)
1938
35.0 C (95.0 F)
1939
37.8 C (100.0 F)
1940
38.3 C (100.9 F)
1941
36.7 C (98.1 F)
1942
36.7 C (98.1 F)
1943
34.4 C (93.9 F)
1944
36.1 C (97.0 F)
1945
11.1 C (52.0 F)
1948
36.7 C (98.1 F)
1949
36.7 C (98.1 F)
1950
33.3 C (91.9 F)
1951
33.3 C (91.9 F)
1952
36.1 C (97.0 F)
1953
38.9 C (102.0 F)
1954
36.7 C (98.1 F)
1955
36.7 C (98.1 F)
1956
37.8 C (100.0 F)
1957
33.9 C (93.0 F)
1958
33.3 C (91.9 F)
1959
34.4 C (93.9 F)
1960
36.1 C (97.0 F)
1961
33.3 C (91.9 F)
1962
35.6 C (96.1 F)
1963
36.7 C (98.1 F)
1964
36.1 C (97.0 F)
1965
35.0 C (95.0 F)
1966
37.8 C (100.0 F)
1967
34.4 C (93.9 F)
1968
35.6 C (96.1 F)
1969
36.1 C (97.0 F)
1970
37.8 C (100.0 F)
1971
37.2 C (99.0 F)
1972
35.6 C (96.1 F)
1973
36.1 C (97.0 F)
1974
36.7 C (98.1 F)
1975
34.4 C (93.9 F)
1976
36.7 C (98.1 F)
1977
36.7 C (98.1 F)
1978
36.1 C (97.0 F)
1979
35.0 C (95.0 F)
1980
37.8 C (100.0 F)
1981
33.9 C (93.0 F)
1982
34.4 C (93.9 F)
1983
38.3 C (100.9 F)
1984
35.6 C (96.1 F)
1985
36.1 C (97.0 F)
1986
36.1 C (97.0 F)
1987
37.2 C (99.0 F)
1988
40.0 C (104.0 F)
1989
37.8 C (100.0 F)
1990
37.8 C (100.0 F)
1991
38.9 C (102.0 F)
1992
34.4 C (93.9 F)
1993
34.4 C (93.9 F)
1994
35.6 C (96.1 F)
Coldest night (TNn)
The coldest night of the year at Chicago UNIV, 1926 to 1994. The record is -31.1 C (-24.0 F) in 1985, marked on the chart; the median year is -21.7 C (-7.1 F).
Coldest night (TNn) at Chicago UNIV by year
Year
Coldest night (TNn)
1926
-21.7 C (-7.1 F)
1927
-22.8 C (-9.0 F)
1928
-21.1 C (-6.0 F)
1929
-22.8 C (-9.0 F)
1930
-26.7 C (-16.1 F)
1931
-14.4 C (6.1 F)
1932
-20.0 C (-4.0 F)
1933
-28.3 C (-18.9 F)
1934
-21.7 C (-7.1 F)
1935
-21.7 C (-7.1 F)
1936
-27.2 C (-17.0 F)
1937
-17.2 C (1.0 F)
1938
-17.8 C (0.0 F)
1939
-16.1 C (3.0 F)
1940
-25.6 C (-14.1 F)
1941
-20.6 C (-5.1 F)
1942
-25.0 C (-13.0 F)
1943
-23.3 C (-9.9 F)
1944
-17.8 C (0.0 F)
1945
-20.6 C (-5.1 F)
1948
-12.2 C (10.0 F)
1949
-20.0 C (-4.0 F)
1950
-18.9 C (-2.0 F)
1951
-24.4 C (-11.9 F)
1952
-18.3 C (-0.9 F)
1953
-16.1 C (3.0 F)
1954
-21.1 C (-6.0 F)
1955
-22.2 C (-8.0 F)
1956
-15.6 C (3.9 F)
1957
-20.0 C (-4.0 F)
1958
-21.1 C (-6.0 F)
1959
-21.7 C (-7.1 F)
1960
-23.3 C (-9.9 F)
1961
-18.9 C (-2.0 F)
1962
-23.3 C (-9.9 F)
1963
-26.7 C (-16.1 F)
1964
-16.7 C (1.9 F)
1965
-22.2 C (-8.0 F)
1966
-26.7 C (-16.1 F)
1967
-22.8 C (-9.0 F)
1968
-24.4 C (-11.9 F)
1969
-22.2 C (-8.0 F)
1970
-22.8 C (-9.0 F)
1971
-21.1 C (-6.0 F)
1972
-26.7 C (-16.1 F)
1973
-17.8 C (0.0 F)
1974
-20.0 C (-4.0 F)
1975
-19.4 C (-2.9 F)
1976
-22.2 C (-8.0 F)
1977
-26.7 C (-16.1 F)
1978
-20.6 C (-5.1 F)
1979
-25.0 C (-13.0 F)
1980
-18.9 C (-2.0 F)
1981
-20.6 C (-5.1 F)
1982
-29.4 C (-20.9 F)
1983
-28.9 C (-20.0 F)
1984
-25.6 C (-14.1 F)
1985
-31.1 C (-24.0 F)
1986
-19.4 C (-2.9 F)
1987
-19.4 C (-2.9 F)
1988
-23.3 C (-9.9 F)
1989
-25.0 C (-13.0 F)
1990
-20.0 C (-4.0 F)
1991
-17.8 C (0.0 F)
1992
-21.1 C (-6.0 F)
1993
-18.9 C (-2.0 F)
1994
-28.9 C (-20.0 F)
Wettest day (Rx1day)
The wettest day of the year at Chicago UNIV, 1926 to 1994. The record is 130.3 mm (5.1 in) in 1957, marked on the chart; the median year is 57.4 mm (2.3 in).
Wettest day (Rx1day) at Chicago UNIV by year
Year
Wettest day (Rx1day)
1926
76.7 mm (3.0 in)
1927
61.5 mm (2.4 in)
1928
68.8 mm (2.7 in)
1929
79.2 mm (3.1 in)
1930
37.6 mm (1.5 in)
1931
71.1 mm (2.8 in)
1932
49.3 mm (1.9 in)
1933
71.4 mm (2.8 in)
1934
47.2 mm (1.9 in)
1935
67.8 mm (2.7 in)
1936
66.5 mm (2.6 in)
1937
35.8 mm (1.4 in)
1938
41.4 mm (1.6 in)
1939
53.1 mm (2.1 in)
1940
48.5 mm (1.9 in)
1941
36.3 mm (1.4 in)
1942
50.3 mm (2.0 in)
1943
31.0 mm (1.2 in)
1944
52.1 mm (2.1 in)
1945
20.6 mm (0.8 in)
1948
38.4 mm (1.5 in)
1949
57.4 mm (2.3 in)
1950
76.7 mm (3.0 in)
1951
86.6 mm (3.4 in)
1952
36.6 mm (1.4 in)
1953
47.2 mm (1.9 in)
1954
88.1 mm (3.5 in)
1955
70.4 mm (2.8 in)
1956
26.9 mm (1.1 in)
1957
130.3 mm (5.1 in)
1958
51.1 mm (2.0 in)
1959
67.8 mm (2.7 in)
1960
73.7 mm (2.9 in)
1961
56.1 mm (2.2 in)
1962
35.6 mm (1.4 in)
1963
48.5 mm (1.9 in)
1964
34.5 mm (1.4 in)
1965
63.8 mm (2.5 in)
1966
77.7 mm (3.1 in)
1967
49.5 mm (1.9 in)
1968
88.9 mm (3.5 in)
1969
74.4 mm (2.9 in)
1970
86.9 mm (3.4 in)
1971
69.1 mm (2.7 in)
1972
55.9 mm (2.2 in)
1973
64.5 mm (2.5 in)
1974
50.5 mm (2.0 in)
1975
81.3 mm (3.2 in)
1976
92.2 mm (3.6 in)
1977
66.3 mm (2.6 in)
1978
56.1 mm (2.2 in)
1979
55.1 mm (2.2 in)
1980
58.2 mm (2.3 in)
1981
65.0 mm (2.6 in)
1982
81.0 mm (3.2 in)
1983
79.5 mm (3.1 in)
1984
41.9 mm (1.6 in)
1985
69.3 mm (2.7 in)
1986
40.6 mm (1.6 in)
1987
78.0 mm (3.1 in)
1988
70.9 mm (2.8 in)
1989
45.7 mm (1.8 in)
1990
100.3 mm (3.9 in)
1991
45.5 mm (1.8 in)
1992
51.3 mm (2.0 in)
1993
51.1 mm (2.0 in)
1994
32.3 mm (1.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Chicago UNIV, 1926 to 1994. The record is 191.1 mm (7.5 in) in 1954, marked on the chart; the median year is 89.1 mm (3.5 in).
Wettest five days (Rx5day) at Chicago UNIV by year
Year
Wettest five days (Rx5day)
1926
142.7 mm (5.6 in)
1927
102.3 mm (4.0 in)
1928
119.6 mm (4.7 in)
1929
85.6 mm (3.4 in)
1930
52.8 mm (2.1 in)
1931
102.6 mm (4.0 in)
1932
78.0 mm (3.1 in)
1933
116.6 mm (4.6 in)
1934
59.1 mm (2.3 in)
1935
107.4 mm (4.2 in)
1936
143.0 mm (5.6 in)
1937
53.1 mm (2.1 in)
1938
96.0 mm (3.8 in)
1939
69.9 mm (2.8 in)
1940
68.6 mm (2.7 in)
1941
90.3 mm (3.6 in)
1942
63.3 mm (2.5 in)
1943
64.8 mm (2.6 in)
1944
76.2 mm (3.0 in)
1945
22.7 mm (0.9 in)
1948
59.0 mm (2.3 in)
1949
83.1 mm (3.3 in)
1950
117.6 mm (4.6 in)
1951
96.8 mm (3.8 in)
1952
58.6 mm (2.3 in)
1953
62.7 mm (2.5 in)
1954
191.1 mm (7.5 in)
1955
113.5 mm (4.5 in)
1956
86.9 mm (3.4 in)
1957
135.7 mm (5.3 in)
1958
61.0 mm (2.4 in)
1959
79.2 mm (3.1 in)
1960
89.1 mm (3.5 in)
1961
126.5 mm (5.0 in)
1962
54.1 mm (2.1 in)
1963
92.4 mm (3.6 in)
1964
66.7 mm (2.6 in)
1965
71.4 mm (2.8 in)
1966
97.3 mm (3.8 in)
1967
73.4 mm (2.9 in)
1968
119.4 mm (4.7 in)
1969
107.4 mm (4.2 in)
1970
106.7 mm (4.2 in)
1971
104.7 mm (4.1 in)
1972
140.2 mm (5.5 in)
1973
65.3 mm (2.6 in)
1974
62.5 mm (2.5 in)
1975
87.7 mm (3.5 in)
1976
93.0 mm (3.7 in)
1977
102.4 mm (4.0 in)
1978
93.7 mm (3.7 in)
1979
75.7 mm (3.0 in)
1980
105.4 mm (4.1 in)
1981
112.0 mm (4.4 in)
1982
106.8 mm (4.2 in)
1983
141.9 mm (5.6 in)
1984
68.9 mm (2.7 in)
1985
75.7 mm (3.0 in)
1986
86.1 mm (3.4 in)
1987
125.2 mm (4.9 in)
1988
87.4 mm (3.4 in)
1989
78.7 mm (3.1 in)
1990
108.7 mm (4.3 in)
1991
89.4 mm (3.5 in)
1992
74.1 mm (2.9 in)
1993
115.0 mm (4.5 in)
1994
49.8 mm (2.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Chicago UNIV, 1926 to 1994. The record is 33 days in 1939, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Chicago UNIV by year
Year
Longest dry spell (CDD)
1926
15 days
1927
19 days
1928
17 days
1929
21 days
1930
16 days
1931
18 days
1932
18 days
1933
26 days
1934
28 days
1935
17 days
1936
26 days
1937
16 days
1938
18 days
1939
33 days
1940
23 days
1941
20 days
1942
28 days
1943
25 days
1944
28 days
1945
21 days
1948
17 days
1949
13 days
1950
17 days
1951
16 days
1952
27 days
1953
22 days
1954
17 days
1955
21 days
1956
19 days
1957
23 days
1958
19 days
1959
23 days
1960
19 days
1961
16 days
1962
17 days
1963
23 days
1964
24 days
1965
16 days
1966
23 days
1967
20 days
1968
12 days
1969
25 days
1970
12 days
1971
12 days
1972
13 days
1973
13 days
1974
9 days
1975
13 days
1976
21 days
1977
14 days
1978
16 days
1979
28 days
1980
14 days
1981
14 days
1982
16 days
1983
17 days
1984
14 days
1985
13 days
1986
22 days
1987
14 days
1988
27 days
1989
20 days
1990
11 days
1991
23 days
1992
20 days
1993
20 days
1994
18 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
59 years with a frost
Across 59 years with a frost, the median last spring frost at Chicago UNIV falls on 12 April and the median first autumn frost on 2 November, which leaves a median of 206 days between them.
Fitted over all years, the growing season changes by +0.8 days per decade at this station.
Frost dates and growing season at Chicago UNIV
Measure
Median, all years
Earliest period
Recent period (1961 to 1993)
Recent against earliest
Fitted trend
Last spring frost
12 April
n/a
11 April
n/a
-0.4 days per decade
First autumn frost
2 November
n/a
3 November
n/a
+0.4 days per decade
Growing days
206 days
n/a
206 days
n/a
+0.8 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
63 years, 1926 to 1993
A day with at least 60.3 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 112.7 mm (4.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Chicago UNIV: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
60.3 mm (2.4 in)
5 years
77.3 mm (3.0 in)
10 years
87.2 mm (3.4 in)
25 years
98.4 mm (3.9 in)
50 years
105.9 mm (4.2 in)
100 years
112.7 mm (4.4 in)
Longer than the 63 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, 63 years of values from 1926 to 1993.
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: 130.3 mm (5.1 in) in 1957; 100.3 mm (3.9 in) in 1990; 92.2 mm (3.6 in) in 1976.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Chicago UNIV standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Chicago UNIV 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.